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Proceedings Paper

High-energy 2-um laser for multiple lidar applications
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Paper Abstract

Solid-state 2-?m laser has been receiving considerable interest because of its eye-safe property and efficient diode pump operation. It has potential for multiple lidar applications to detect water vapor, carbon dioxide and winds. In this paper, we describe a 2-?m double pulsed Ho:Tm:YLF laser and end-pumped amplifier system. A comprehensive theoretical model has been developed to aid the design and optimization of the laser performance. In a single Q-switched pulse operation, the residual energy stored in the Tm atoms will be wasted. However, in a double pulses operation mode, the residual energy stored in the Tm atoms will repopulate the Ho atoms that were depleted by the extraction ofthe first Q-switched pulse. Thus, the Tm sensitized Ho:YLF laser provides a unique advantage in applications that require double pulse operation, such as DIfferential Absorption Lidar (DIAL). A total output energy of 146 nil per pulse pair under Q-switch operation is achieved with as high as 4.8 % optical to optical efficiency. Compared to a single pulse laser, 70% higher laser efficiency is realized. To obtain high energy while maintaining the high beam quality, a master-oscillator-power-amplifier 2-tim system is designed. We developed an end-pumped Ho:Tm:YLF disk amplifier. This amplifier uses two diode arrays as pump source. A non-imaging lens duct is used to couple the radiation from the laser diode arrays to the laser disk. Preliminary result shows that the efficiency of this laser can be as high as 3 %, a factor of three increases over side-pump configuration. This high energy, highly efficient and high beam quality laser is a promising candidate for use in an efficient, multiple lidar applications.

Paper Details

Date Published: 13 February 2001
PDF: 8 pages
Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); doi: 10.1117/12.417025
Show Author Affiliations
Jirong Yu, NASA Langley Research Ctr. (United States)
Upendra N. Singh, NASA Langley Research Ctr. (United States)
James C. Barnes, NASA Langley Research Ctr. (United States)
Norman P. Barnes, NASA Langley Research Ctr. (United States)
Mulugeta Petros, Science and Technology Corp. (United States)

Published in SPIE Proceedings Vol. 4153:
Lidar Remote Sensing for Industry and Environment Monitoring
Upendra N. Singh; Upendra N. Singh; Kazuhiro Asai; Toshikasu Itabe; Toshihiro Ogawa; Nobuo Sugimoto, Editor(s)

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