Beam quality of TEA CO2 lasers with coaxial output unstable resonators
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Wuhan National Laboratory for Opotoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
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Corresponding author:
YU Wen-feng, gdlase@rsohu.com
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Received Date:
2007-03-05
Accepted Date:
2007-04-27
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Abstract
As one of the ideal and new energy sources in propulsion systems,TEA CO2 laser,with the increasing of single pulse energy,must have high beam quality to acquire high efficiency in long distance transmission.The divergence angle of TEA CO2 laser with stable resonator and improved unstable resonator with a vortex tube cooling system are accurately measured at 1Hz,using diffuse reflection and beam filter method respectively,giving the value of β is 12.53 and 3.28 respectively.Meanwhile,the pulse energy of unstable resonator reduced very little.As the result shown,the improved unstable resonator is much more valuable in propulsion system and the result is helpful in large volume high energy TEA CO2 lasers.
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