Simultaneous Dual-wavelength Operation Research Articles

Simultaneous dual-wavelength laser operation at 937 and 1062 nm in Nd3+:Gd3Ga5O12

Diode-end-pumped continuous-wave (cw) simultaneous dual-wavelength laser operation at 937 and 1062 nm in a single Nd3+:Gd3Ga5O12 (Nd:GGG) crystal was demonstrated. A total output power of 1.12 W at the two fundamental wavelengths was achieved at incident pump power of 17.6 W. The optical-to-optical conversion was up to 6.4% with respect to the incident pump power. To the best of our knowledge, this is first work on cw simultaneous dual-wavelength operation at 937 and 1062 nm in Nd:GGG crystal.

Simultaneous dual-wavelength operation of Nd:YVO_4 self-Raman laser at 1524 nm and undoped GdVO_4 Raman laser at 1522 nm

A diode-pumped, actively Q-switched dual-wavelength laser employing Nd:YVO(4) self-Raman emission at 1524 nm and undoped GdVO(4) Raman emission at 1522 nm is demonstrated. With a pump power of 21.5 W and pulse repetition frequency of 20 kHz, a maximum dual-wavelength output power of 1.62 W was obtained, comprising a 0.54 W, 1522 nm Raman component and 1.08 W, 1524 nm self-Raman component. The corresponding dual-wavelength Raman pulse width was 5.6 ns. The experimental results indicate that this laser, with quite small wavelength separation, was effective by virtue of simultaneous self-Raman and Raman shifts.

Quasi-three-level neodymium-doped yttrium aluminum garnet laser emitting at 885 nm

We present a diode-pumped quasi-three-level neodymium-doped yttrium aluminum garnet (Nd:YAG) laser at 885 nm, based on the 4F3/2-4I9/2 transition, generally used for a 946 nm emission. Combined with polarization components (Nd:YAG), the electro-optical crystal KH2PO4 (KDP) formed a Lyot filter in the cavity and compressed the available gain bandwidth. With an incident pump power of 9.2 W, a 714 mW continuous-wave (CW) output at 885 nm was achieved, and the optical-to-optical efficiency was 7.8%. With an adjustable voltage applied to the KDP crystal, the laser wavelength could be tuned from 885 nm to 884 nm. A simultaneous dual-wavelength Nd:YAG laser at 885 nm and 884 nm was also realized by adjusting the free spectral range of the Lyot filter. To our knowledge, it is the first study that has realized the tuning between the 884 and 885 nm lines and the simultaneous dual-wavelength CW laser operation at 885 nm and 884 nm.

Simultaneous dual-wavelength operation at 1.06 and 1.34 μm in Nd-vanadate laser crystals

Output performances of Nd-vanadate lasers with simultaneous dual-wavelength emission on the 1.06-μm 4 F 3/2 → 4 I 11/2 transition and the 4 F 3/2 → 4 I 13/2 transition at 1.34 μm are discussed. The design uses a linear resonator for emission at 1.06 μm and an L-type folded resonator for the 1.34-μm wavelength, and the ratio between the power of a single wavelength and the total power is adjusted by the choice of the output mirror transmissions. A continuous-wave (CW) Nd:GdVO4 laser with total output power in the range of 3.9 to 6.8 W and the corresponding ratio of the output power at 1.06 μm to the total output power between 0.26 and 0.97 is realized. It is also shown that in comparison with the pump at 808 nm, the pump directly into the 4 F 3/2 emitting level at 879 nm improves the total output power. Furthermore, a Nd:GdVO4 laser with simultaneous emission at 1.06 and 1.34 μm and that generates also green light at 0.53 μm by intracavity frequency-doubling with LiB3O5 (LBO) nonlinear crystal is demonstrated.

Continuous-wave dual-wavelength operation of a diode-end-pumped Nd:LuVO4 laser

A diode-end-pumped continuous-wave (CW) simultaneous dual-wavelength laser operation at 1062 and 1331 nm in a single Nd:GGG was demonstrated. A total output power of 1.08 W at the two fundamental wavelengths was achieved at the incident pump power of 18.2 W. The optical-to-optical conversion is up to 5.9% with respect to the incident pump power. To the best of our knowledge, this is first work on CW simultaneous dual-wavelength operation of a diode pumped Nd:GGG laser. The article is published in the original.)

Simultaneous dual-wavelength CW laser operation at 1064 and 930 nm in Nd3+:YAlO3

A dual-wavelength continuous-wave (CW) diode end-pumped Nd3+:YAlO3 (Nd:YAP) laser that generates simultaneous laser action at the wavelengths 1064 and 930 nm is demonstrated. A total output power of 2.15 W (1.57 W at 1064 nm and 0.58 W at 930 nm) for the dual-wavelength was achieved at the incident pump power of 17.8 W with optical conversion efficiency of 12.1%. The M 2 values for 930 and 1064 nm lights were found to be around 1.21 and 1.32, respectively.

Intracavity conf iguration for tuning and obtaining simultaneous dual-wavelength operation from CW Nd:YAG laser

In this letter, a thin slab of glass is used as Fabry-Perot etalon inside a cavity of a continuous wave (CW) Nd:YAG laser to change the behavior of its output longitudinal modes. The slab etalon is used as tuning element when it turns around the laser cavity axis. Two simultaneous longitudinal modes with a relatively wide tuning range from 5.83 MHz to 0.02 THz are obtained when the Nd:YAG laser is operated at moderate output power of about 120 mW. The mode structure of this configuration is modeled and simulated. Computer-generated diagrams are also presented schematically and compared with the experimental results.

Simultaneous dual-wavelength laser operation at 1342 and 946 nm in two laser crystals and their sum-frequency mixing

A sum-frequency yellow–green laser at 554.9 nm is reported by this paper, 946 nm wavelength is obtained from 4F 3/2– 4I 9/2 transition in Nd:YAG and 1342 nm wavelength is obtained from 4F 3/2– 4I 13/2 transition in Nd:YVO 4. Using a doubly folded-cavity type-II critical phase matching KTP crystal intra cavity to make 946 nm laser from Nd:YAG and 1342 nm laser from Nd:YVO 4 frequency summed, with incident pumped power of 30 W in Nd:YAG and 20 W in Nd:YVO 4, TEM 00 mode yellow–green laser at 554.9 nm at 1.15 W is obtained and its M 2 factor is less than 1.22. The experimental results show that the Nd:YAG and Nd:YVO 4 crystals intra-cavity sum-frequency mixing is an effective method for yellow–green laser and it can be applied to other two laser crystals to obtain more all-solid-state lasers with different wavelengths.

Simultaneous dual-wavelength oscillation at 1357 nm and 1444 nm in a Kr-flashlamp pumped Nd:YAG laser

A Nd:YAG laser pumped by a Kr-flashlamp with simultaneous dual-wavelength operation at 1357nm (4F3/2→4I13/2(R1→X4)) and 1444nm (4F3/2→4I13/2(R1→X7)) is demonstrated and its characteristics was analyzed. The output energy of 82mJ at 1357nm and 138mJ at 1444nm were achieved simultaneously with the maximum electrical input energy of 44J. Stability of the output energy in the dual-wavelength operation was 1.41% at the maximum input energy of 44J. However, the stabilities at each wavelength in the dual-wavelength operation showed much lower stability.

Continuous-wave simultaneous dual-wavelength operation at 912 nm and 1063 nm in Nd:GdVO4

A continuous-wave, diode-pumped Nd:GdVO4 thin disk laser with simultaneous dual-wavelength emission at the 912 nm 4F3/2→4I9/2 quasi-three-level transition and the 1063 nm 4F3/2→4I11/2 four-level transition is demonstrated and analyzed. Output powers of 1.7 W at 912 nm and of 1.6 W at 1063 nm were achieved simultaneously from a 0.3-at.%, 300-μm thick Nd:GdVO4 crystal that was multi-pass excited with 26.8 W of available diode pump power. Second harmonic generation to 456 nm with LiB3O5 yielded 0.96 W in 912 nm single-wavelength operation and 0.73 W in 912 nm/1063 nm dual-wavelength operation.

Simultaneous dual-wavelength CW operation using 4F3/2–4I13/2 transitions in Nd:YVO4 crystal

We experimentally demonstrate a dual-wavelength continuous wave (CW) Nd:YVO4 laser simultaneously operating at 1342 and 1386nm. A total output power of 439mW is achieved when the laser is diode-end-pumped at an incident pump power of 2.4W, indicating a slope efficiency of 35.6%. To the best of our knowledge, it is the first time that simultaneous dual-wavelength CW operation at 1342 and 1386nm is reported.

Simultaneous dual-wavelength continuous wave laser operation at 1.06 μm and 946 nm in Nd:YAG and their frequency doubling

A diode-pumped cw (continuous wave) simultaneous dual-wavelength laser operation at 1.06 μm and 946 nm in a single Nd:YAG was demonstrated. The oscillation condition for the simultaneous dual-wavelength operation was derived. A total output power of 2.5 W at the two fundamental wavelengths was achieved at the incident pump power of 17.5 W. Their second harmonic generation at 532 and 473 nm was obtained through frequency doubling with nonlinear crystals KTP (KTiOPO 4) and LBO (LiB 3O 5), respectively.

Cw dual-wavelength operation of a diode-end-pumped Nd:YVO 4 laser

A dual-wavelength continuous wave (cw) diode-end-pumped Nd:YVO4 laser that generates simultaneous laser action at the wavelengths 1064 nm and 1342 nm is demonstrated. The optimum oscillation condition for the simultaneous dual-wavelength operation in a diode-end-pumped solid-state laser has been derived. The relationship between the laser cavity and the output stability is also studied. Experimental results show that the stability of the output power at the two wavelengths could be enhanced by use of a three-mirror cavity.

Simultaneous dual-wavelength operation in cascaded strongly gain-coupled DFB lasers

Using cascaded strongly gain-coupled (SGC) DFB lasers, simultaneous dual-wavelength operation can be obtained with better than a 40-dB side-mode suppression ratio (SMSR) under simple operating conditions at various temperatures. Dual-wavelength operation with various spacing can be achieved by grating fabrication and by simply activating the lasing section of the cascaded SGC DFB lasers. The lasing wavelengths can be tuned within several nanometers by base temperature variation and their spacing can be fine tuned by individual injection current.

Dual-wavelength operation of a self-seeded dye laser oscillator

We demonstrate simultaneous dual-wavelength operation of a self-seeded dye laser. The laser cavity consists of one dye cell, two pairs of grating and tuning mirrors, and two reflecting mirrors. This configuration can be decomposed with two grazing-incidence cavities and a standing-wave cavity. The self-seeded dual-wavelength output beams are collinear and independently tunable. We were able to vary the output powers at the two wavelengths smoothly by changing the cavity length of a master oscillator.

Simultaneous multiwavelength operation of a commercial rare gas halide laser

Simultaneous dual wavelength operation of a commercial-discharge excited rare gas halide excimer laser is reported for the first time. A combined energy output in excess of 20 mJ was obtained for the 193 and 248 nm ArF and KrF <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">B \rightarrow X</tex> transitions oscillating simultaneously, and also for the 248 and 351 nm KrF and XeF transitions. Analysis indicates that significantly higher dual wavelength energies should be possible.