The significance of researching and developing thermal stabilization systems for end-pumped amplifiers in high-power lasers is evident in modern optical and laser technology. There are several key factors driving this importance. Firstly, high-power laser systems have pivotal applications across diverse fields, including science, medicine, industry, and defense. Secondly, high-power laser systems generate substantial heat, resulting in thermal effects that impact their optical stability and efficiency. Thirdly, the implementation of optical thermal stabilization systems enhances the performance and durability of high-power lasers. In summary, the research and development of optical thermal stabilization systems for end-pumped amplifiers are crucial endeavors in ensuring the stability, efficiency, and reliability of high-power laser systems.
We present the results of compact and cost-efficient high-power and energy laser system based on a picosecond gain-switched DFB laser diode operating at a wavelength of 1064 nm with spectral linewidth less than 0.1 nm and pulse duration of 50 ps and tapered double clad fiber (T-DCF) amplifier. The unique properties of T-DCF as efficient amplification of low power seed signal and suppressed threshold of nonlinearities allow achievement of both high peak power of 170 kW and pulse energy of 9 μJ at pulse repetition rate of 10 MHz while maintaining spectrum linewidth as narrow as 0.1 nm. High average output power of 150 W was obtained with slightly broader laser linewidth. We also demonstrate second harmonic generation with over 30 W at 532 nm wavelength with conversion efficiency of 38%. These results make MOPA system based on gain-switched DFB laser diode and T-DCF amplifier an attractive source for material processing and sensing application including time resolved Raman spectroscopy.
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