type-I Critical Phase Matching Research Articles

Single-Stage Ti:Sapphire-Pumped Deep-Infrared Optical Parametric Oscillator Based on CdSiP2

We report a high-repetition-rate femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based on the nonlinear optical crystal, CdSiP2 (CSP), pumped directly by a Ti:sapphire laser, for the first time. By pumping CSP at μ m, we have achieved practical output powers at the longest wavelengths generated by any Ti:sapphire-pumped OPO. Using a combination of pump wavelength tuning, type-I critical phase matching, and cavity delay tuning, we have generated continuously tunable radiation across 6654–8373 nm (1194–1503 cm−1) at 80.5-MHz repetition rate, providing up to 20 mW of average power at 7314 nm and >7 mW beyond 8000 nm, with idler spectra exhibiting bandwidths of 140–180 nm across the tuning range. Moreover, the near-IR signal is tunable across 1127–1192 nm, providing up to 37 mW of average power at 1150 nm. Signal pulses, characterized using intensity autocorrelation, have durations of ∼260–320 fs, with corresponding time-bandwidth product of Δ υ Δ τ ∼ 1. The idler and signal output exhibit a TEM00 spatial profile with single-peak Gaussian distribution. With an equivalent spectral brightness of ∼6.68 × 1020 photons s−1 mm−2 sr−1 0.1% BW−1, this OPO represents a viable alternative to synchrotron and supercontinuum sources for deep-IR applications in spectroscopy, metrology, and medical diagnostics.

Critically phase-matched Ti:sapphire-laser-pumped deep-infrared femtosecond optical parametric oscillator based on CdSiP2.

We report a high-repetition-rate femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based on type-I critical phase-matching in CdSiP2 (CSP), pumped directly by a Ti:sapphire laser. Using angle-tuning in the CSP crystal, the OPO can be continuously tuned across 7306-8329nm (1201-1369 cm-1) in the deep-IR. It delivers up to 18mW of idler average power at 7306nm and >7 mW beyond 8000nm at 80.5MHz repetition rate, with the spectra exhibiting bandwidths of >150 nm across the tuning range. Moreover, the signal is tunable across 1128-1150nm in the near-infrared, providing up to 35mW of average power in ∼266 fs pulses at 1150nm. Both beams exhibit single-peak Gaussian distribution in TEM00 spatial profile. With an equivalent spectral brightness of ∼5.6×1020photons s-1 mm-2 sr-10.1% BW-1, this OPO represents a viable alternative to synchrotron and supercontinuum sources for deep-IR applications in spectroscopy, metrology, and medical diagnostics.

High-power continuous-wave diode-side-pumped Nd:YAP/LBO 670.7 nm red laser

In this paper, a high power continuous-wave red laser was reported with LD side-pumped Nd:YAP crystal and type-I critical phase matching of LBO crystal. The thermal focal length of Nd:YAP crystal was measured, and the parameters of laser cavity were selected by computer optimum designing. The output characteristics of line cavity and V-cavity were compared in experiment. By using V-cavity, the red laser output of 9.98W at continuous 670.7nm with near fundamental mode was obtained under the incident pump power of 800W for the Nd:YAP crystal, the divergence of the laser beam was about 10mrad. To the best of our knowledge, these results represent the highest performance at this wavelength for continuous-wave solid-state lasers.

An efficient all-solid-state doubly resonant continuous-wave ultraviolet laser at 284 nm

We report for the first time coherent ultraviolet radiation at 284 nm by intracavity sum-frequency generation of a 607 nm Pr:YLF laser and a 532 nm frequency doubling Nd:YVO4 laser. The ultraviolet laser is obtained by using double resonator, type-I critical phase matching CsLiB6O10 (CLBO) crystal sum-frequency mixing. With a total pump power of 18.8 W (3.1 W pump power for the 607 nm Pr:YLF laser and 15.7 W pump power for the 532 nm Nd:YVO4 frequency doubling laser), a TEM00 mode ultraviolet laser beam at 284 nm of 242 mW is obtained. The power stability is better than 3.4% and laser beam quality M2 factors are 1.13 and 1.22 in the horizontal and vertical dimensions respectively.

An efficient all-solid-state doubly resonant sum-frequency continuous-wave ultraviolet laser at 299 nm

We report for the first time coherent ultraviolet radiation at 299 nm by intracavity sum-frequency generation of an 899 nm Nd:YAG laser and a 456 nm frequency doubling Nd:GdVO4 laser. The ultraviolet laser is obtained by using doubly resonant, type-I critical phase matching CsLiB6O10 (CLBO) crystal sum-frequency mixing. With a total diode pump power of 35.6 W (17.2 W pump power for the 899 nm Nd:YAG laser and 18.4 W pump power for the 456 nm Nd:GdVO4 frequency doubling laser), a TEM00 mode ultraviolet laser at 299 nm of 331 mW is obtained. The power stability is better than 3.4% and the laser beam quality M2 factors are 1.22 and 1.17 in the horizontal and vertical dimensions respectively.

494 nm blue laser based on sum-frequency mixing of diode pumped Nd3+ lasers

We report for the first time a continuous-wave (CW) blue radiation at 494 nm by intracavity sumfrequency generation of 912 nm Nd:GdVO4 laser and 1079 nm Nd:YAlO3 (Nd:YAP) laser. Using type-I critical phase matching LiB3O5 (LBO) crystal, 494 nm blue laser was obtained by 912 and 1079 nm intra-cavity sum-frequency mixing, and output power of 179 mW was demonstrated. At the output power level of 179 mW, the output power stability is better than 3.5% and laser beam quality M 2 factor is 1.21.

504 nm blue-green laser based on sum-frequency mixing of diode pumped Nd3+ lasers

We report for the first time a continuous-wave (CW) blue-green radiation at 504 nm by intracavity sum-frequency generation of 946 nm Nd:YAG laser and 1080 nm Nd:YAlO3 (Nd:YAP) laser. Using type-I critical phase matching LiB3O5 (LBO) crystal, 504 nm blue-green laser was obtained by 946 and 1080 nm intra-cavity sum-frequency mixing, and output power of 215 mW was demonstrated. At the output power level of 215 mW, the output power stability is better than 4.7% and laser beam quality M2 factor is 1.21.

480-nm blue laser based on sum-frequency mixing of diode pumped Nd:ASL-Yb:YAG lasers

We report for the first time a continuous-wave (CW) coherent radiation at 480 nm by intracavity sum-frequency generation of 900 nm Neodymium Doped Strontium and Lanthanum Aluminate (Nd:ASL) laser and 1030 nm Yb:Y3Al5O12 (Yb:YAG) laser. Blue laser is obtained by using a doubly cavity, type-I critical phase matching LiB3O5 (LBO) crystal sum-frequency mixing. With total pump power of 28.6 W, the blue laser at 480 nm of 170 mW is obtained. At the output power level of 170 mW, the blue power stability is better than 4.7% and laser beam quality M2 factor is 1.43.

3.62 W of continuous-wave orange-yellow light generated by intra-cavity sum-frequency mixing of Nd:YVO 4

A design of laser-diode array (LDA) end-pumped Nd:YVO 4 laser that generates simultaneous laser action at wavelengths 1064 and 1342 nm is presented. Using type-I critical phase matching (CPM) BiB 3O 6, 593.5 nm continuous-wave (cw) Orange-yellow laser is obtained by 1064 nm and 1342 nm in an intra-cavity sum-frequency mixing. The maximum laser output power of 3.62 W is obtained when an incident pump laser of 27.5 W is used. The optical-to-optical conversion is up to 13.2%. To the best of our knowledge, this is the highest conversion efficiency at 593.5 nm in an intra-cavity sum-frequency Nd:YVO 4 laser.

A 3.63 W Nd: YVO4 orange-yellow laser with intracavity sumfrequency mixing

A design of laser-diode array (LDA) end-pumped Nd:YVO4 laser that generates simultaneously wavelengths of 1064 nm and 1342 nm is presented, and by using type-I critical phase matching (CPM) of BiB3O6, 593.5 nm continuous-wave (CW) laser is obtained with intracavity sum-frequency mixing. The maximum laser output power can reach 3.63 W with the pump power of 27.5 W. The optical-to-optical conversion efficiency is up to 13.2%, which is the highest value at 593.5 nm by the intracavity sum-frequency Nd:YVO4 laser according to the reported data.

Completely solid-state LD-side-pumped Nd:YAlO3 CW blue laser with intracavity frequency tripling

We report a completely solid-state continuous-wave (CW) blue laser operating at 447 nm utilizing intracavity frequency tripling of an LD-side-pumped Nd:YAlO3 (Nd:YAP) laser operating at 1341.4 nm. An LBO crystal with type-I critical phase matching and a KTP crystal with type-II critical phase matching (CTM) were used for the second harmonic generation (SHG) and the third harmonic generation (THG), respectively. In view of the analysis of the cavity stability, a four-mirror folded cavity was designed and the output characteristics were theoretically analyzed. Experimental characteristics obtained were shown to be in agreement with the theoretical analysis. The maximum output power of the 447 nm CW blue laser reached 114 mW, which corresponds to a red-to-blue conversion efficiency of 9%.

Multi-watt power blue light generation by intracavity sum- frequency-mixing in KTiOPO_4 crystal

In this paper, a high power blue laser at 447 nm was obtained by intracavity sum-frequency-mixing of a diode-side-pumped Q-switched Nd:YAlO(3)(Nd:YAP) laser operating at 1341.4 nm. A type-I critical phase matching LiB(3)O(5) (LBO) crystal and type-II critical phase matching KTiOPO(4) (KTP) crystal were used for second harmonic generation and third harmonic generation, respectively. The phase matching condition of the KTP crystal was researched. The results show that the KTP has superiority in intracavity sum-frequency-mixing blue light generation. 4.76 W blue light output was achieved at 4.6 kHz with the pulse width of 190ns. The fluctuation of output power was better than 3% at the output power of 4.76 W during half an hour.

2.41 W compact efficient CW blue light generation by intra-cavity frequency doubling of a compact Nd:YAG laser

We report on a laser diode end-pumped Nd:YAG blue laser using a three-mirror-folded cavity. Three different crystals cut for type-I critical phase matching are used for the intra-cavity frequency doubling of the laser: 10-mm-long LiB 3O 5 (LBO), 15-mm-long LBO, and 10-mm-long BiB 3O 6 (BIBO). Up to 2.41 W of continuous wave output power in the blue spectral range at 473 nm is achieved with BIBO crystal (1.89 W with LBO) at the incident pump power of 16 W, the light-to-light conversion efficiency is about 15.1%.

Diode-pumped 593.5 nm cw yellow laser by type-I CPM LBO intracavity sum-frequency-mixing

A design of LD-pumped Nd:YVO 4 laser that generates simultaneous laser action at wavelengths 1064 and 1342 nm by optimizing film design is presented. An optimized continuous-wave (cw) yellow laser at 593.5 nm in room temperature is obtained for the first time. Using type-I critical phase-matching (CPM)LBO crystal, a yellow laser at 593.5 nm is obtained by 1064 and 1342 nm intracavity sum-frequency mixing. The maximum laser output power of 85 mW is obtained when an incident pump laser of 1.8 W is used. The optical-to-optical conversion is up to 4.7%, and the power stability in 24 h is better than ±2.8%.