Measurement of thermal lensing in a power amplifier of a terawatt Ti:sapphire laser |
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| Authors: | S Ito H Nagaoka T Miura K Kobayashi A Endo K Torizuka |
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| Institution: | (1) The Femtosecond Technology Research Association, 5-5 Tokodai, Tsukuba 300-2635, Japan, JP;(2) Department of Applied Physics, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan, JP;(3) Department of Electrical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, JP;(4) National Institute of Advanced Industrial Science and Technology (AIST), 1-1-4 Umezono, Tsukuba 305-8568,Japan, JP |
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| Abstract: | We have measured detailed thermal lensing in a power amplifier of a terawatt Ti:sapphire laser operating at 50 Hz. The thermal
lensing in the amplifier was evaluated by measuring the optical path difference (OPD) using a Shack–Hartmann-type wavefront
sensor. It was found that the radial dependence of the OPD was almost quadratic in the pumping region, despite inhomogeneous
pumping. Therefore, a simple spherical lens or convex mirror effectively compensates for the thermal lens in our amplifier.
We found that the thermal lens profile was temporally stable, and did not degrade the pointing stability of the amplified
laser pulses. We also found that the time constant of the thermal distortion in our power amplifier was approximately 0.5 s.
Received: 3 September 2001 / Revised version: 23 January 2002 / Published online: 14 March 2002 |
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| Keywords: | PACS: PACS: 42 55 -f 42 65 Re |
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