Research progress on thermal effect of LD pumped solid state laser

Shang, Peijin; Bai, Lu; Wang, Shiyu; Cai, Defang; Li, Bingbin

doi:10.1016/j.optlastec.2022.108640

Cited by 18 publications

(1 citation statement)

References 89 publications

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“…In fact, the influence of strong thermal focusing caused by high-intensity pumping has been shown to be easily controllable both theoretically and experimentally. These results imply that the derivation of precise physical parameters and precise techniques to compensate for thermo-optical distortions, which have also been recently suggested to be necessary [54,55], are not so important for high efficiency using high gain by high-intensity pumping. These results indicate that high-gain by highintensity pumping can be used to achieve high efficiency lasing for a wide range of cavity loss conditions.…”

Section: Dependence Of Laser Threshold Intensity On Cavity Lengthmentioning

confidence: 84%

Influence of High-Intensity Pumping on Gain Medium Temperature Increase and Laser Mode Tunability in a Hemispherical Short Cavity

Kawato

2023

Photonics

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To increase the efficiency of laser oscillators by overcoming losses, the unsaturated gain must be increased. For this purpose, high-intensity pumping, typically higher than 100 kW/cm2, is effective. However, the temperature increase and strong thermo-optic effects of the gain medium have been pointed out as obstacles to high efficiency in solid-state lasers. Therefore, the effect of high pump intensity on the laser mode tunability required for high efficiency is investigated by studying the dependence of the laser threshold on the cavity length using a continuous-wave hemispherical short-cavity laser. The results show that the laser mode can be tuned with sufficient range and precision for high efficiency under various loss conditions regardless of the high pump intensity and are in qualitative agreement with a simple theory. Furthermore, according to the heat transport theory, microchip Yb:YAG, the gain medium of this study, does not have a high cooling efficiency, but the maximum temperature increase is estimated to be only about 12 K despite the high pump intensity of about 110 kW/cm2. This is because it is the pump power, not the pump intensity, that is proportional to the temperature increase, as the maximum pump power is only 900 mW. These results indicate that high-intensity pumping is a promising approach to achieve efficient lasing at low cost.

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Section: Dependence Of Laser Threshold Intensity On Cavity Lengthmentioning

confidence: 84%

Influence of High-Intensity Pumping on Gain Medium Temperature Increase and Laser Mode Tunability in a Hemispherical Short Cavity

Kawato

2023

Photonics

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Intelligent Laser Emitting and Mode Locking of Solid‐State Lasers Using Human‐Like Algorithms

Guo,

Fan,

et al. 2024

Laser & Photonics Reviews

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Solid‐state lasers based on mode‐locked technology are widely studied for their strong ability of average or peak power scaling and wide wavelength coverage. However, it usually takes a long time and a lot of effort to manually align an ultrafast solid‐state laser to achieve laser emission and stable mode‐locking. Here, an approach based on intelligent human‐like algorithms is proposed for aligning a solid‐state ultrafast laser system. The intelligent system is based on multi‐algorithm fusion and can fully simulate the process of observation, analysis, decision, and action of an experienced experimenter in the adjustment of the laser alignment and mode‐locking. The intelligent adjustment starts from the state of no laser emission, adopts the neural network, the modified augmented random search (ARS) algorithm, random search, and sliding window strategy, and takes the fluorescence and speckle patterns as indications to realize the laser emission and stable mode‐locking automatically. Several validation experiments are conducted using this intelligent system, and the stable mode‐locked pulses can be achieved within 40 s. This technology provides an efficient solution to the ultrafast solid‐state laser that requires full automatic laser emitting and stable mode‐locking for the first time.

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