Active synchronization of two mode-locked lasers with optical cross correlation |
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| Authors: | T Miura H Nagaoka K Takasago K Kobayashi A Endo K Torizuka M Washio F Kannari |
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| Institution: | (1) Department of Electrical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan, JP;(2) Department of Applied Physics, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan, JP;(3) The Femtosecond Technology Association, 5-5 Tokodai, Tsukuba, Ibaraki 300-2635, Japan, JP;(4) National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan, JP;(5) Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-0072, Japan, JP |
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| Abstract: | Two mode-locked Ti:sapphire lasers of different wavelengths were precisely synchronized by a simple feedback system employing
sum-frequency generation (cross correlation). When the timing error exceeded the pulse duration, the periodic bunch of the
sum-frequency pulse was used for rough timing adjustment. Using cross correlation with a stretched pulse, we struck a balance
between wide locking range and sensitive timing detection. When the two lasers were well-synchronized, we obtained a continuous
cross-correlation pulse train for 3 min. The holding time of the laser synchronization was extended to over one hour by adding
a motorized stage to the PZT-mounted cavity mirror. We estimated the rms timing jitter between the two lasers by a scanning
cross-correlation measurement. We confirmed that the rms timing jitter of the two lasers during 1.8 s was 28 fs.
Received: 30 January 2002 / Revised version: 14 June 2002 / Published online: 8 August 2002 |
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| Keywords: | PACS: 42 65 Ky 42 60 Fc 42 60 Lh |
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