Seeder-injected pulsed laser using EOM for Lidar applications

A stable single-frequency pulsed laser is a critical element for lidar applications, such as high spectral resolution lidar, direct detection Doppler wind lidar and so on. We have designed a laser diode dual-end-pumped, single-frequency Qswitched Nd:YAG laser with 1064 nm wavelength output for the laser transmitter of lidar. Injection seeding is performed by utilizing an electro-optic phase modulator. Specifically, a RbTiOPO 4 crystal is used to modulate the slave cavity length based on the delay-ramp-fire method. The laser is capable of generating 7.5 mJ pulse-energy with 14.6 ns pulse width, 45 MHz linewidth at 900 Hz repetition rate. The frequency jitter is less than 1.1 MHz over two minutes and the beam quality factor M is approximately 1.3. This seeder injected laser is capable of operating at high repetition rate with high frequency stability and nearly Fourier-transform-limited linewidth. It is believed a good candidate for lidar applications