Abstract
A conductively cooled, laser diode (LD) end pumped, injection-seeded single frequency Nd:YAG laser is designed and implemented. A compact standing wave resonator with dual-end-pumping arrangement is constructed, and two fiber-coupled LDs with maximum output power of 150 W independently are used as the pump source. A composite Nd:YAG rod is utilized as the gain medium with the aim of reducing thermal lens. The optimized ramp-fire technique is applied to build reliable single longitudinal mode oscillating. The laser is capable of producing a 10 mJ Q-switched pulse at the pulse repetition rate of 100 Hz and 250 Hz. Due to the thermal effect in YAG rod, although the single frequency is remained at 1000 Hz, the single pulse energy is decreased to 8.8 mJ. The M<sup>2</sup> of the laser beam are no more than 1.3 for all three operation frequency. At 1000 Hz with the output of 8 mJ, the linewidth of 54.2 MHz and the frequency jitter of less than 3.5 MHz (rms) over 2 min are detected by heterodyne technique.
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