Abstract
ABSTRACT A nanosecond Nd:YAG based high-energy kilohertz Master Oscillator Power Amplifier (MOPA) system has been developed. The Q-switched master oscillator emits 6.5-ns, 1-kHz pulses with energy up to 1.6 mJ. The design of the oscillator ensures TEM 00 operation with high stability and insensitivity to cavity misalignment. Two different amplification schemes - slab and ro d geometry of the amplifiers have been studied. We have developed a compact, five-pass gain module with slab design, pump ed by four 30-W collimated laser diode bars. The amplified output energy is 8 mJ at 1 kHz. The optical-to-optical conversion efficiency is 15 %. The second scheme is based on side-pumped rod preamplifier with consequent end amplifier with depolarizati on compensation. This system delivers up to 18 mJ linearly polarized TEM 00 pulses - corresponding to 5 % optical-to-optical conversion efficiency. Key words: solid state lasers, high energy , nanosecond, rod and slab amplification 1. INTRODUCTION Compact tunable nanosecond-pulse, all-solid-state laser systems operating in the infrared are of fundamental interest for both scientific and industrial applications including LIDAR
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