Plasma Light Research Articles

Plasma Treatments and Light Extraction from Fluorinated CVD-Grown (400) Single Crystal Diamond Nanopillars

We investigate the possibilities to realize light extraction from single crystal diamond (SCD) nanopillars. This was achieved by dedicated 519 nm laser-induced spin-state initiation of negatively charged nitrogen vacancies (NV−). We focus on the naturally-generated by chemical vapor deposition (CVD) growth of NV−. Applied diamond was neither implanted with 14N+, nor was the CVD synthesized SCD annealed. To investigate the possibility of light extraction by the utilization of NV−’s bright photoluminescence at room temperature and ambient conditions with the waveguiding effect, we have performed a top-down nanofabrication of SCD by electron beam lithography (EBL) and dry inductively-coupled plasma/reactive ion etching (ICP-RIE) to generate light focusing nanopillars. In addition, we have fluorinated the diamond’s surface by dedicated 0 V SF6 ICP plasma. Light extraction and spin manipulations were performed with photoluminescence (PL) spectroscopy and optically detected magnetic resonance (ODMR) at room temperature. We have observed a remarkable effect based on the selective 0 V SF6 plasma etching and surprisingly, in contrast to literature findings, deactivation of NV− centers. We discuss the possible deactivation mechanism in detail.

Plant Growth Control by Using Pulsed Plasma Light

Plant Growth Control by Using Pulsed Plasma Light

SAT-205 POEMS: A Medical Odyssey

Introduction: POEMS (polyneuropathy, organomegaly, endocrinopathy, monoclonal plasma cell disorder, and skin changes) syndrome is a rare disorder with poorly understood pathogenesis. The incidence of endocrinopathy associated with POEMS syndrome has been recognized more frequently in the last two decades, ranging between 67-84%. The cause of endocrine dysfunction associated with the syndrome is not known, but has been described to include hypogonadism, hypothyroidism, abnormalities of glucose metabolism, hyperprolactinemia, gynecomastia in men, hyperestrogenemia, calcium abnormalities and adrenal insufficiency (AI).Case: A 38 y/o Hispanic male was initially referred to nephrology with complaint of leg swelling. Subsequently, the patient was referred to endocrinology for abnormal thyroid function studies and ongoing fatigue. Patient had prior medical history of recently diagnosed hypothyroidism treated with levothyroxine 100 mcg daily. The most bothersome complaint was pitting edema in the lower extremities with associated pain. He also endorsed right shoulder pain exacerbated by use of the right arm. He reported unintentional weight loss of about 30 pounds in the past 2-3 years, denying night sweats. He did endorse feeling fatigued, skin darkening, and erectile dysfunction. On exam patient was afebrile, BP 120/71 mm/Hg, HR 87 bpm, no goiter, no gynecomastia, skin hyperpigmentation, darkening creases of the palms, pitting edema in lower extremities. Work up showed abnormal lambda monoclonal bands in plasma and monoclonal lambda free light chain in urine. Bone survey showed lytic lesion in right scapula. [prolactin 15.6 ng/ml (normal (NL)= 0-25), free testosterone 23.1 pg/ml (NL= 35.0-155.0), total testosterone 205 ng/dl (NL= 250-1100), LH 8.2 MIU/ml (NL= 1.2-8.6), FSH 4.3 MIU/ml (NL=1.3-19.3), TSH 17.8 uIU/ml (NL= 0.45-5.33), free T4 0.62 ng/dl (NL= 0.58-1.64), free T3 3.05 pg/ml (NL=2.5-3.9), TPO antibody (AB) negative, IGF-1 41 ng/ml (NL=53-331), AM cortisol 8.2 ug/dl (NL=6.7-22.6), ACTH 99 pg/ml (NL=6-50), aldosterone 3 ng/dl (NL ≤28), renin activity 2.78 ng/ml/h (NL=0.25-5.82), 21-hydroxylase AB negative, 17-hydroxyprogesterone 54 ng/dl (NL=42-196), DHEA-S 88 mcg/dl (NL=106-464)]. ACTH stimulation test (250 mcg) was performed with basal cortisol 8.0 ug/dl (NL= 5.0- 21.0), basal ACTH 93 pg/ml (NL=6-50), 30min cortisol 9.7 ug/dl (NL=13.0-30.0), 60min cortisol 10.2 ug/dl (NL=14.0-36.0). Pt was diagnosed with primary AI and started on hydrocortisone. CT abdomen and pelvis with contrast showed normal adrenal glands.Discussion: Physicians should be cognizant of a unifying diagnosis in a syndrome of such a broad presentation. Endocrinopathies vary in extent of dysfunction and may fluctuate during the course of POEMS syndrome. Multidisciplinary management as well as regular reassessment of endocrine function is integral in managing this complex disease.

Thermal Effect on the Performance of an Alternating-Current Dielectric-Barrier-Discharge Plasma Actuator

The dielectric-barrier-discharge (DBD) plasma actuator is a popular technology for active flow control; however, the influence of the heat generated by the actuator on its performance is seldom mentioned. In this work, an experimental investigation is conducted to evaluate the interaction between spontaneous heat generation and the performance of an alternating-current DBD (AC-DBD) plasma actuator. The characteristics of the AC-DBD plasma actuator are examined temporally in quiescent air, including the profile of the induced flow, capacitance properties, power consumption, plasma light emission, and surface temperature. The particle image velocimetry shows that the velocity profile of the induced flow increases temporally, indicating enhanced momentum injection by the AC-DBD plasma actuator. The capacitance, power consumption, plasma brightness, and surface temperature increase with the operation time analogously to exponential curves (), and the values of these properties are proportional to 3.5 power of the applied voltage. The dielectric surface is categorized into three typical streamwise regions according to the heat generation characteristics: the plasma region, the insulated electrode region, and the far-field region. The dominant heat generation occurs in the plasma region due to the plasma discharge. The temperature increase of the local dielectric and the gas–plasma mixture enlarges the actuator capacitance, benefits the local induced electric field, and results in longer mean free paths of particles and stronger discharges accordingly. Thus, the spontaneous heat generation affects the induced ionic wind, and the performance of the AC-DBD plasma actuator is time dependent during the early period of the operation.

Microbial decontamination of red pepper powder using pulsed light plasma

Pulsed light plasma (PLP) treatment, a simultaneous treatment with cold plasma (CP) and intense pulsed light (IPL), was studied for its effects on the inactivation of indigenous bacteria contaminating red pepper powder. Higher IPL voltage and frequency and PLP treatment time yielded greater bacterial inactivation, while moisture or oxygen addition to plasma-forming gas did not affect the inactivation efficacy. The efficacy increased with a decrease in the distance between the PLP reactor and IPL lamp and an increase in the powder water activity. PLP treatment that yielded the highest inactivation (2.9 log CFU/g Est.) increased the powder surface temperature from 20.6 to 29.9 °C. PLP treatment did not affect the color, capsaicin and ascorbic acid concentrations, and antioxidant activity, while altered the flavor sensory property and surface morphology. The results demonstrated the potential of applying PLP to non-thermally decontaminate the powder.

Spatially resolved determination of the electronic density and temperature by a visible spectro-tomography diagnostic in a linear magnetized plasma

In this work, a non-intrusive, spatially resolved, spectro-tomographic optical diagnostic of the electronic density and temperature on the linear plasma column Mistral is presented. Coupling of spectroscopy and tomography technique gives access to the local plasma light emission at different wavelengths (visible and near IR) in an argon plasma. Taking advantage of the symmetry of the Mistral experiment, the diagnostic results are validated and the plasma is found to correspond to a corona equilibrium state. With the use of another spectrometer and a Langmuir probe, we propose a non-intrusive method to determine the electronic density and temperature of each pixel of the tomographic images of the plasma. The obtained results are in good agreement with the Langmuir probe ones.

The Characteristics of Dielectric Barrier Discharge Plasma Under the Effect of Parallel Magnetic Field

The dielectric barrier discharge plasma (DBDP) has been produced by the dielectric barrier discharge (DBD) reactor that has been established to operate at atmospheric pressure. DBD reactor consists of two parallel metal electrodes, one is a high-voltage (HV) electrode with a circular iron plate shape and the other is a rectangular steel plate, and the ground electrode with a dielectric material covered one of them. The ac power supply has been used to provide the DBD circuit with ac voltage up to 15kV peak value, 50 Hz. The dielectric material used, which covered one reactor electrode, is a glass slab. The gap distance of the discharge is fixed at 3 mm. Argon (Ar) and air gases have been used in the experiment at 20SCFH (standard cubic foot per hour) flow rate, and a sinusoidal voltage is applied to the electrodes to generate a homogenous DBDP. The parameters of the discharge such as discharge current, discharge voltage, consumed power of discharge, streamer filament, and emitted plasma light have been studied. A magnetic field, with the direction parallel to the electric field, is applied to the ac and DBD, using Ar and helium (He) gases. The effect of the parallel magnetic field for generating the DBDP has been investigated. It indicates that the discharge current in the antiparallel magnetic field is lower than that without the magnetic field. Also, the DBDP in the magnetic field is more luminous than that without the magnetic field. It further indicates that the area of Lissajous figure of the DBD in the presence of antiparallel magnetic field is little reduced than that without the magnetic field. It could be concluded that the effect of the magnetic field influenced DBDP progress.

Multi-spectral interference imaging using laser-induced plasma light source

Interference imaging techniques are widely used for studying surface and internal structure of various objects. By varying the operating wavelength of the interference system, one can also obtain the information about the spectral properties of the inspected specimen. For multi-spectral interference imaging applications, wide-band high power light sources are necessary. Most of the existing sources suffer from speckle noise, low brightness or high price. In this paper, we demonstrate the applicability of a laser-induced plasma light source for interference imaging and quantitative phase measurements. Narrow-band spectral filtration of its illumination within a wavelength range 240-2600 nm allows to design cost-effective schemes for a variety of metrological applications including digital holography and spectral-domain optical coherence tomography.

Unintuitive behaviour of fibre coupled collimating optics used for plasma emission observations

The collection of light emitted from a plasma or other volumetric light source is often collected using an optical collimator coupled to an optical fibre. In this work the spatial dependence of transmission from a light source into a fibre via a variety of collimating lens systems is investigated using a table top optical setup and a full 3D ray tracing simulation. The solid angle emitted from a point source that is accepted into the fibre is found to depend in a complex and unintuitive manner on the spatial position of the source relative to the optical system. Back-illumination is often used to focus the optical system such that it produces a well defined beam, which is then assumed as a ‘line of sight’. However even in these cases there are non-monotonic behaviours within this ‘line of sight’ that mean the often-made assumption of a single acceptance angle or cone of observation is not valid in these systems. This has significant implications for the application of these optical systems to the observation of non-uniform volumetric light sources where variations of light intensity or spectrum occur within the defined line of sight.

A Multi-Sensor Data Fusion System for Laser Welding Process Monitoring

Most existing laser welding process monitoring (LWPM) technologies focus on detecting post-process defects. However, in sheet metal laser welding applications such as welding of electronic consumer products during mass production, in-process defect detection is more important. In this article, a compact LWPM system using multi-sensor data fusion to detect in-process defects has been built. This system can collect the time series of plasma intensity, light intensity and temperature data for feature analysis. To verify the system's effectiveness, a plasma-light-temperature dataset has been compiled, which consists of 5,836 samples of nine classes, including one positive class and eight negative classes of typical in-process defects. A multi-sensor data fusion network based on a convolution neural network for in-process defect detection, called IDDNet, has also been proposed. Experimental results have demonstrated that IDDNet can achieve better multi-classification results than the support vector machine, with an overall accuracy of 97.57%. In particular, considering this monitoring process as a binary classification problem, IDDNet can achieve a 99.42% accuracy. Moreover, IDDNet can reach an average speed of 0.79ms per sample on a single GTX 1080ti graphics card, which meets the real-time requirement for industrial production. The proposed LWPM system has been successfully verified in real applications of sheet metal laser welding.

Acoustical monitoring of laser-matter interaction using nanosecond radiation pulses with periodically modulated intensity

Nanosecond laser ablation of metal target under the action of radiation pulses with periodically modulated intensity is investigated. Generated pressure pulses are detected by piezo-transducer (lithium niobate) on the back target side. Such approach permits to measure simultaneously recoil pressure behavior and calculate the irradiated surface displacement during laser action by comparison modulated parts of laser and acoustic signals. Nanosecond laser pulses contain 10–15 short peaks of 60 ps duration (1.08 μm wavelength) which provide fluence values up to 30 J cm−2 in the pulse. Plasma light emission is also registered with the help of photodiode. At the considered fluences surface displacement during the pulse turns out to be considerably smaller than theoretical estimation for free vacuum vaporization and measured experimental displacement which follows from the arrival time delay of another pressure signals generated with subsequent laser pulse directed to the same spot. Such behavior can be evidence that crater formation in the considered irradiation regime occurs after the pulse end.

Development of a cryogenic ion mobility spectrometer for an isomer-selected photoexcitation and reaction studies

SynopsisA new development aiming experimental studies of isomer-selected gas-phase reactions and photoexcitation processes is being conducted. The experiment is based on isomer separation by an ion mobility spectrometry and ion accumulation in a temperature-variable radiofrequency ion trap. The laser plasma light source at Rikkyo University is currently under an upgrade for providing ultraviolet light at the wavelength region from 90 to 200 nm. We report on the details of the experimental setup and current status of the development.

Alignment of swift cluster ions in high-energy-density plasma

Unusual position exchange among ions constituting a swift cluster was found in a high-energy-density plasma. In this paper, the peculiar ion behavior appears in a Si cluster, moving with a speed of ~0.2c (c: speed of light) in a solid Al plasma in the context of the cluster-ion beam driven inertial confinement fusion (ICF). The ion position exchange behavior of cluster ions may influence the cluster-ion beam ICF (CIF) target structure design. In this paper we discuss a possibility of cluster-ion beams as the energy driver in CIF. In conclusions, the present work suggests that the following two points in CIF: (1) The unusual ion position exchange of the cluster ions would not induce a remarkable change in the ion stopping range in CIF targets, and (2) the swift cluster ions may not provide a significant vicinage effect on the stopping range.

Transmembrane protease serine 5: a novel Schwann cell plasma marker for CMT1A.

ObjectiveDevelopment of biomarkers for Charcot‐Marie‐Tooth (CMT) disease is critical for implementing effective clinical trials. The most common form of CMT, type 1A, is caused by a genomic duplication surrounding the PMP22 gene. A recent report (Neurology 2018;90:e518–3524) showed elevation of neurofilament light (NfL) in plasma of CMT1A disease patients, which correlated with disease severity. However, no plasma/serum biomarker has been identified that is specific to Schwann cells, the most directly affected cells in CMT1A.MethodsWe used the Olink immuno PCR platform to profile CMT1A patient (n = 47, 2 cohorts) and normal control plasma (n = 41, two cohorts) on five different Olink panels to screen 398 unique proteins.ResultsThe TMPRSS5 protein (Transmembrane protease serine 5) was elevated 2.07‐fold (P = <0.0001) in two independent cohorts of CMT1A samples relative to controls. TMPRSS5 is most highly expressed in Schwann cells of peripheral nerve. Consistent with early myelination deficits in CMT1A, TMPRSS5 was not significantly correlated with disease score (CMTES‐R, CMTNS‐R), nerve conduction velocities (Ulnar CMAP, Ulnar MNCV), or with age. TMPRSS5 was not significantly elevated in smaller sample sets from patients with CMT2A, CMT2E, CMT1B, or CMT1X. The Olink immuno PCR assays confirmed elevated levels of NfL (average 1.58‐fold, P < 0.0001), which correlated with CMT1A patient disease score.InterpretationThese data identify the first Schwann cell‐specific protein that is elevated in plasma of CMT1A patients, and may provide a disease marker and a potentially treatment‐responsive biomarker with good disease specificity for clinical trials.

Effect of Liquid Phase Plasma Irradiation on Production by Photocatalytic Water Splitting over SrTiO3 Photocatalysts

AbstractA plasma in liquid state was applied as a light source in photocatalysis. The effects of liquid phase plasma irradiation were investigated for hydrogen evolution on the photocatalysts. The photocatalytic activities for hydrogen production from liquid phase plasma and UV light irradiation were compared. SrTiO3 perovskite photocatalysts which prepared by a sol‐gel method with high temperature calcining were introduced in the photocatalytic reaction. The effects of the metal loading on the perovskite photocatalysts were also evaluated in photocatalysis. A small amount of hydrogen was generated in the photo‐decomposition by irradiation of plasma into water without photocatalysts. The rate of hydrogen evolution by photocatalysis using plasma was increased on TiO2 and SrTiO3 perovskite photocatalysts. The photocatalytic activity was improved significantly with the metal loading on SrTiO3 perovskite photocatalysts.

A Real-Life Study of Autologous Stem-Cell Transplantation in Patients with Multiple Myeloma Older Than 65 Years in a Latin American Country

Introduction: The majority of patients with Multiple Myeloma (MM) are elderly (≥ 65 years). High dose chemotherapy followed by autologous stem cell transplantation (HDCT-ASCT) is the standard of care in patients younger than 65 years. This treatment option should be individualized in elderly patients, mainly due to increased toxicity. Goals: To assess the safety and outcome of HDCT-ASCT in real life in patients ≥ 65 years of age with a diagnosis of MM. Material and methods: Retrospective cohort study of consecutive patients with a diagnosis of MM according to the IMWG 2014 criteria from a single academic center in Argentina, undergoing their first HDTC-ASCT during the period 2008- 2018. Patients with plasma cell leukemia or light chain amyloidosis were excluded. Data was extracted from medical records and collected in an standardized case report form. Consolidation treatment and maintenance were used according to the standard of institutional care at the time of the ASCT. The patients ≥ 65 years old at HDCT-ASCT were compared with those below &lt; 65 years treated in the same period. Response were categorized as: complete remission (CR), very good partial remission plus partial remission (VGPR/PR) and stable disease plus progression disease (EE/PD). Overall response rate (ORR) included CR, VGPR and PR. Overall survival (OS) and progression free survival (PFS) were calculated using the Kaplan and Meier method and compared using log-rank test. For survival, the risk ratio (HR) was calculated according to the multivariate Cox regression model. Transplant-related mortality (TRM) was analyzed with cumulative incidence curves of competitive risks. Values of p &lt;0.05 were considered statistically significant. Results: A total of 221 patients were included in the analysis: 50 patients ≥65 years (7 out of 50 &gt; 70 years) and 171 patients &lt;65 years. Patient's demographics and disease characteristics by age group are summarized in Table 1. Reduced conditioning regimen (melphalan 140 mg/m2) was used in 5% of younger patients and 24% of older patients, p &lt;0.001. In the safety analysis, no significant differences were found between the two groups in the median days of hospitalization, duration of days of neutropenia or thrombocytopenia and life support measures during the period of hospitalization for the transplant (Table 2). The TRM was 2.7% at 100 days (95% CI 1.1-5.5); there was no difference between patients ≥ 65 years and &lt;65 years (2% vs. 2.9%, respectively; p = 0.928). CR before transplant was 22% and 24% and at day 100 after ASCT 44% and 37% in patients ≥65 years and &lt;65 years, respectively. For VGPR, corresponding rate were 64% and 67% before transplant and 79% and 77% at day 100 after ASCT in patients ≥65 years and &lt;65 years, respectively. ASCT increased CR rate in both groups (p=0.050 and p=0.024, respectively). After a median follow-up of 42.5 months (IQR 21-71.5), 3-year PFS was 56.2% (95% CI 39.8-70%) in ≥65 years and 58.2% (95% CI 49.6-65.9) in &lt;65 years; (p = 0.86). The OS at 3 years was 78.3% (95% CI 62.1-88, 2) in ≥65 years and 79.3% (95% CI 71.6-85.1) in &lt;65 years; (p = 0.94). In the multivariate analysis including age at transplant, the quality of pre-transplant response (HR 0.08 for CR, p &lt;0.001; HR 0.16 for VGPR/PR, p = 0.003) and the use of IP (HR 0.51; p = 0.047) were associated with better OS; while the age at transplant had no impact (HR 1.06; p=0.865) (Figure 1). For PFS , including age at transplant, only the quality of pre-transplant response demonstrated statistical significance (HR 0.06 for CR, p &lt;0.001; HR 0.14 for VGPR/PR, p &lt;0.001). Additionally, post-transplant maintenance, was independently associated with better OS (HR 0.34; p=0.016) and PFS (HR 0.47; p &lt;0.001). Conclusions: Our data shows that it is feasible and safe to perform HDCT-ASCT in fit patients with multiple myeloma older than 65 years, and even in patients &gt;70 years old. Patient selection should be based on frailty and comorbidities rather than chronological age alone. This group of patients experiences survival benefits similar to young patients. Disclosures No relevant conflicts of interest to declare.

Physical and mechanical properties of surface modified poly ethylene terephthalate films through low pressure plasma and ultra-violet light

The present work focussed on the effect of UV light radiation and Direct current glow Discharge Plasma (DC) on Polyethylene Terephthalate (PET) surface for food packaging applications. The PET was treated by three different plasma such as air, argon, and oxygen with a treatment time of 5–25 min and pressure kept as 3 Pa. The PET film was exposed by UV radiation using the wavelength between 200–400 nm UV light Lamp with a treatment time of 5–25 min. And also we measured the electron temperature (Te) and electron density (Ne) of the three different plasmas by Single Langmuir probe method. The surface properties of UV light radiated and plasma treated PET films were characterized by static contact angle, x-ray diffraction, Optical analysis (UV–vis), ATR-FTIR, Structural analysis (AFM)) and the results were compared. We observed that the bulk properties of the treated materials remained unchanged. This was confirmed by x-ray diffraction results. The new polar functional groups were also detected on the treated films by FTIR spectrum analysis. The surface roughness was calculated from AFM analysis for both untreated and treated PET films. The oxygen plasma treated sample showed higher roughness, which indicated that a large amount of oxygen containing polar groups appeared on the surface of the PET film. The obtained results reveal that the plasma treated PET films were more effective than the Ultra-violet (UV) light radiated film.

A scanning reflection X-ray microscope for magnetic imaging in the EUV range.

The mechanical setup of a novel scanning reflection X-ray microscope is presented. It is based on zone plate optics optimized for reflection mode in the EUV spectral range. The microscope can operate at synchrotron radiation beamlines as well as at laboratory-based plasma light sources. In contrast to established X-ray transmission microscopes that use thin foil samples, the new microscope design presented here allows the investigation of any type of bulk materials. Importantly, this permits the investigation of magnetic materials by employing experimental techniques based on X-ray magnetic circular dichroism, X-ray linear magnetic dichroism or the transversal magneto-optical Kerr effect (T-MOKE). The reliable functionality of the new microscope design has been demonstrated by T-MOKE microscopy spectra of Fe/Cr-wedge/Fe trilayer samples. The spectra were recorded at various photon energies across the Fe 3p edge revealing the orientation of magnetic domains in the sample.

Plant architecture and phytochemical composition of basil (Ocimum basilicum L.) under the influence of light from microwave plasma and high-pressure sodium lamps

Potted herbs such as basil are in high year-round demand in Central Europe. To ensure good quality in winter, artificial light is required. Many horticulturists, who want to replace their high-pressure‑sodium (HPS) lamps with light-emitting diodes (LEDs) to save electricity energy, struggle with high investment costs. In addition, switching to LEDs can overwhelm many smaller horticultural enterprises since there is a requirement of adjusting individual light recipes and furthermore cultivation problems can occur due to the lack of infrared radiation.In this study, the influence of light from microwave plasma lamps (MPL), acting as alternative light sources, on secondary metabolites and morphology of basil plants (Ocimum basilicum L.) was tested.Basil plants were grown in a climate chamber with MPL with two different light bulbs emitting either artificial sunlight (AS) or broad white light with increased blue and green light content (sulfur plasma light; SPL). The effect of these new lamp types was compared to standard commercial HPS lamps. In addition to morphological parameters such as height, internode length and fresh weight, plant secondary metabolites were examined. Essential oils and monoterpenes were quantified by GC-MS analysis, whereby phenolic compounds were analyzed calorimetrically.Elongation growth and biomass production was increased under the AS spectrum in comparison to HPS-grown plants. Increased stem elongation was attributed to a higher content of far-red light in the AS spectrum.Furthermore, basil plants grown under the AS spectrum contained the highest total phenolic and total flavonoid content compared to plants grown under the SPL and HPS lamps, probably due to the higher content of UV-A radiation. The lowest content of phenolic compounds was observed when HPS light was used, which was assumed to be caused by a low blue light content in the emission spectrum. An impact of the different light spectra on essential oil composition was determined. A significantly increased content of linalool was found in basil leaves developed under both tested MPL spectra compared to HPS-grown plants. The total yield of the four major essential oils was lowest under HPS treatment.

Soft X-ray spectral analysis of laser produced molybdenum plasmas using the fundamental and second harmonics of a Nd:YAG laser.

Our measurement of the soft X-ray emission of Mo plasmas produced by picosecond Nd:YAG lasers emitting on the fundamental (1064 nm, 150 ps) and second (532 nm, 130 ps) harmonics is presented. The contrast in intensity between spectral peaks and the intensity outside them is lower for the second harmonic produced plasmas probably due to the presence more intense satellite emission and higher optical thickness. The measured spectra are absolutely calibrated and the observed output photon flux was (7 - 9) × 1013 photons/sr in the water-window (2.3 - 4.4 nm) spectral range for a laser energy of 160 mJ independent of laser wavelength. However, in the short wavelength range 1.5 - 2 nm, the emission using the second harmonic is strongly enhanced and is even higher than for the maximum energy of 220 mJ of the fundamental wavelength, so despite inevitable energy losses, laser wavelength conversion may lead to emission enhancement in certain spectral ranges. This enhancement is attributed to higher absorption of short wavelength laser light and higher charge state generation in denser plasmas.