Multistage taper optical fiber phase-conjugation mirror as well as laser double-pass amplification device and laser double-pass amplification method based on multistage taper optical fiber phase-conjugation mirror
A phase conjugation and optical fiber technology, which is applied in the field of multi-segment tapered optical fiber phase conjugation mirror and its laser two-way amplification device, can solve the problems of small dynamic range, difficult to use laser system, easy damage of end face, etc. Improve the quality of the output beam and avoid damage
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[0032] The laser light source in the experiment is Nd:YAG single longitudinal mode MOPA laser system. The seed laser is an electro-optic Q-switched single longitudinal mode laser pumped by LD, with a pulse repetition frequency of 2000 Hz, an output power of 2.1 W, and a beam quality factor of M 2 2 <1.7.
[0033] The laser output from the laser 1 with the initial polarization state P passes through the optical isolation system and then enters the laser amplifier for single-pass amplification. The laser amplifier uses two side-pumped Nd:YAG pump heads with a peak pump power of 5400 W, a laser crystal with a diameter of 10 mm and a length of 150 mm. After one-way amplification, the laser power is 98W, and the beam quality factor is M 2 It is 5.5, and the pulse width remains basically unchanged, still less than 15ns.
[0034] The one-way amplified laser beam passes through the λ / 4 wave plate, and the polarization state becomes circular polarization, and then enters the telesco...
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