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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 
$\pm 1\%$.
