An one-end-pumped Nd:YVO 4 laser with fiber-coupled diode is designed. The mode matching between pump mode and laser mode is analyzed, and the optimum mode matching coefficient is obtained by optimizing the pump mode. Based on the optimal pump mode, a 14.2W TEM00 mode CW laser is obtained with a optical-optical efficiency of 55.7% at 1064 nm, with M 2 factors of M 2 x = 1.16, M 2 y = 1.15. In Q-switching operation, 13.8W average power at a pulse repetition rate of 200 kHz is produced, with a stability of pulse peak value < 5%.
An edge-pumping scheme for a quasi-three-level solid-state laser using asymmetric crystal is reported. The scheme uses a thin disk laser configuration with the pump light incident from disk edges. The pump light propagates through the disk along the zigzag path and repeatedly passes the gain medium, thus improving the pump uniformity and absorption efficiency. A maximum output power of over 123 W was achieved from an edge-pumped composite Yb:YAG/YAG thin disk laser, with slope efficiency of 34.8% and beam quality M 2 ≈ 20.
The combination of the thermal induced refractive index guiding and gain guiding in an end-pumped Nd:YVO 4 MOPA laser is reported. A nonlinear Schrödinger-type wave equation including the combined guiding effect is derived for the amplification process. In experiment, a novel experimental phenomenon, enhancement of beam quality during amplification, is observed in the end-pumped MOPA laser. After amplification by two amplifiers, the 33 W seed laser is scaled up to 107 W, and the beam quality is also enhanced from M 2 ≈ 2.4 to M 2 ≈ 1.2. The theoretical results agree reasonably well with the experiment, which indicates that the evolution of the transverse mode is dominated by the combined guiding effect in the end-pumped Nd:YVO 4 MOPA laser. A new mechanism is proposed by which the combined guiding effect can be applied to control the beam quality during the amplification in the MOPA laser.
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