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9 December 2008 The selection of Q-switch for a 350mJ air-borne 2μm wind lidar
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Abstract
In the process of designing a coherent, high energy 2μm, Doppler wind Lidar, various types of Q-Switch materials and configurations have been investigated for the oscillator. Designing an oscillator with a relatively low gain laser material presents challenges related to the management high internal circulating fluence due to high reflective output coupler. This problem is compounded by the loss of hold-off. In addition, the selection has to take into account the round trip optical loss in the resonator and the loss of hold-off. For this application, a Brewster cut 5mm aperture, fused silica AO Q-switch is selected. Once the Q-switch is selected various rf frequencies were evaluated. Since the Lidar has to perform in single longitudinal and transverse mode with transform limited line width, in this paper, various seeding configurations are presented in the context of Q-Switch diffraction efficiency. The master oscillator power amplifier has demonstrated over 350mJ output when the amplifier is operated in double pass mode and higher than 250mJ when operated in single pass configuration. The repetition rate of the system is 10Hz and with a pulse length of 200ns.
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Mulugeta Petros, Jirong Yu, Bo Trieu, Yingxin Bai, Paul Petzar, and Upendra N. Singh "The selection of Q-switch for a 350mJ air-borne 2μm wind lidar", Proc. SPIE 7153, Lidar Remote Sensing for Environmental Monitoring IX, 715309 (9 December 2008); https://doi.org/10.1117/12.806499
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