In this paper, a ring cavity of Er:YAG laser with a single corner cube prism is investigated. Due to the depolarization effect of the corner cube, the tunable output coupling ratio was 0.25% to 72.67% by changing the angle of the λ / 4 plate according to the calculation results of Jones matrix. An experiment for checking the anti-detuning performances of the single corner cube cavity was also carried out. The results indicated that the output power was stable at the rotating angles of <3.06 deg and 1.637 deg along the vertical and horizontal directions, respectively. Under continuous wave operation, a 5.4 W vertically-polarized laser of 1645.1 nm was acquired through double polarizers with the beam quality factors (M2) of 1.17 in the x direction and 1.42 in the y direction, and the slope efficiency was 45.47%. Additionally, under the condition of a pulse-repetition-frequency (PRF) of 200 Hz, the pump power of 29.04 W, a maximum pulse energy of 2.2 mJ was realized, and the minimum pulse width was 86 ns, leading to a peak power of 25.58 KW.
An 808 nm LD end-pumped trapezoidal 1.064μm Nd:YAG laser was demonstrated in this paper. The advantage of using a trapezoidal crystal was that under the same volume of the gain medium, the length of the gain medium was significantly increased, which increased the output power. The maximum continuous wave average power of 2.16W was obtained with the pump power of 30.5W, and the slope efficiency was 13.75%. After adding an acousto-optic Q switch with selective polarization function in the cavity, the pulse energy of 1.05 mJ, the pulse width of 80.7 ns at the PRF of 1 kHz was obtained. And the output laser was s-polarized. The beam quality factor was measured as M2~2.95.
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