Abstract
An all-solid-state single-frequency 1064 nm laser with a $100~{\rm\mu}\text{s}$ pulse width, 500 Hz repetition rate and 700 mJ single pulse energy is designed using seed injection and a three-stage master oscillator power amplifier (MOPA) construction. Using this as a basis, research on long-pulse laser frequency doubling is carried out. By designing and optimizing the lithium triborate (LBO) crystal, the theoretically calculated maximum conversion efficiency ${\it\eta}_{\max }$ reaches 68% at $M^{2}=1$ , while ${\it\eta}_{\min }$ is 33% at $M^{2}=3$ . Generation of 212 mJ pulses of green light with a repetition rate as high as 500 Hz is obtained from a fundamental energy of 700 mJ. The experimental conversion efficiency reaches 31% and the power stability is better than $\pm 1\%$ .
Highlights
In recent years, with the development of adaptive optics, quantum optics and optical communications, high-power allsolid-state lasers are required[1, 2]
After injecting the seed laser into a series of solid-state amplifiers, a 1064 nm long-pulse single-frequency laser is achieved with a high repetition frequency, high power and high beam quality
It will be advantageous for obtaining a high conversion efficiency to focus the incident laser, because the power density is enhanced as the beam spot size gets smaller
Summary
With the development of adaptive optics, quantum optics and optical communications, high-power allsolid-state lasers are required[1, 2]. Intra-cavity frequency doubling can take advantage of the higher power density of the fundamental light in the cavity to achieve a high conversion efficiency and low pump threshold, but the beam quality is difficult to control. Extra-cavity frequency doubling is a better choice for the mentioned seed light injection amplification structure since the optical–optical efficiency is high and the beam quality is controlled. After injecting the seed laser into a series of solid-state amplifiers, a 1064 nm long-pulse single-frequency laser is achieved with a high repetition frequency, high power and high beam quality. To the best of our knowledge, this is the highest power yet achieved for a long-pulse, single-frequency green laser with a repetition rate of 500 Hz
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