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1 kHz dual sub-pulse train picosecond radially polarized beam KGW Raman generator capable of achieving multiple optical communication wavelength
摘要： A dual sub-pulse train 1064 nm picosecond radially polarized beam pump KGW single-pass Raman generator was designed. The Stokes lines of both the 768 cm?1 and 901 cm?1 vibrational modes of the KGW Raman-active crystal were excited simultaneously. The Raman generator radiated up to seven Stokes lines in the infrared spectrum, which covered multiple optical communication channels. The overall Stokes average power reached 1.01 W, and the maximum Raman overall conversion efficiency was 23.1%. The interaction between the optical field and the Raman crystal was discussed from two perspectives of line width compression and beam quality.
关键词： Multi-wavelength KGW Raman laser,Nonlinear optics,Dual sub-pulse train picosecond laser,Infrared spectrum,Radially polarized beam
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - All Passive KGW/Tm:YAP Raman Laser
摘要： High brightness sources in the 2-3 micron region are essential for many applications including wavelength selective microsurgery, material processing, and gas monitoring. Although there are some rare-earth ions which enable such laser sources like Tm, Ho and Cr, those suitable lasers do not tailor all this spectral range. Solid-state Raman lasers are one of the efficient methods enabling to extend the spectral span of high brightness sources. Over the last five years, this trend was also realized in the 2 micron region, using BaWO4 and YVO4 crystals as Raman gain medium. Having minor thermal lensing and high damage threshold KGd(WO4)2 (KGW) is another promising Raman crystal, implemented until now with 1064 nm and 532 nm. This crystal has two different Raman shifts (901 cm-1 and 768 cm-1), enabling to yield, by control of the polarization orientation, two different stokes wavelengths. Here we present, for the first time, an external-cavity configuration for an all Passive Raman laser, based on passive fundamental pump with a KGW crystal. The KGW being pumped by an end pump CrZnS passively Q-switched Tm:YAP laser emitting at 1935 nm. This laser seed modified from our previous work, in order to achieve the higher peak power for the non-linear effect to take place. The seed had a maximal energy pulse of 1.5 mJ, having a pulse duration of 17 ns at a repetition rate of 1.3 kHz resulting in a peak-power of 90 kW for an average power of 2.1 W. This Raman laser emitted at 2270 nm and 2350 nm having 150 and 104 mW average power, respectively. Pulse duration as short as 12.5 ns and a maximal peak-power of 14.35 kW obtained.
关键词： KGW,Tm:YAP,2-3 micron region,Raman laser,passive Q-switching
更新于2025-09-12 10:27:22