We propose a thin-disk multi-pass amplifier based on a pair of conjugated parabolic mirrors. Pumped with 940nm laser diode and seeded with 1030nm ps regenerative amplifier, this novel amplifier scheme exhibits relatively high efficiency and insensitivity to the thermal lensing of the thin-disk caused by high pump power density. Parameters of the output beam have been measured. The beam quality of the seed laser was found to be deteriorated after propagating through the amplifier, with the M2 factor changed from 1.3 to 18.4. In order to acquire a further comprehension on the origins of the deterioration of beam quality, simulations and experiments were carried out.
The thin-disk shape laser crystal is the core component of the thin disk laser. In the experiment, we found that the crystal edge is prone to abnormal high temperature in the operation, which causes the thin disk laser's conversion efficiency to decrease, and even the make crystal cracks. In order to solve this problem, two aspects that may cause this effect are researched during the disc crystal manufacturing process, and finally determined that the splash of solder during the packaging process is the main cause of this problem. In the end, we used the edge chamfering method to eliminate this problem, and the finally obtained thin disk crystal can reduce the temperature by 50% and increase the conversion efficiency by 15% when the laser operates.
A SESAM mode-locked Yb:YAG thin disk laser was designed and analyzed based on the conjugated dual parabolic mirrors multi-pass pumping scheme. In the experiment, 3.6W mode-locked pulses were obtained at the repetition rate of 38.3MHz with a 5% transmission output coupler at 1030 nm. And the phenomenon of double pulses and chaotic-QML were observed in the high pumping power. Moreover, it was found that the pumping power range of the CW modelocking was very narrow in our experiment.
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