System for automatically adjusting the GVD of a Gires-Tournois i

Details System for automatically adjusting the GVD of a Gires-Tournois i System for automatically adjusting the GVD of a Gires-Tournois i

1991-10-07

1992-12-22

Scott, Jr, Leon

Coherent light generators

Particular beam control device

Mode locking

372 20, 372 25, 372 92, 372 98, 372 29, 372 39, 372 99, 372 33, H01S 3098

Patent

active

051739089

ABSTRACT:
A system is described for automatically maintaining the group velocity dispersion (GVD) of a Gires-Tournois interferometer (GTI) as the wavelength of incident light is varied. In the system, the transmission through the GTI is monitored by a photodiode as the wavelength is varied. The transmission through the GTI provides a measure of its GVD. Thus, the output of the photodiode can be used as a control signal for adjusting the GTI in a manner to maintain its GVD at the desired level. The subject system is illustrated in conjunction with a pulsed, tunable, Ti:sapphire laser which is passively mode locked with the optical Kerr effect. The system allows the wavelength of the laser to be tuned over the bandwidth of the gain medium while maintaining a selected level of GVD from the GTI which in turn maintains the desired duration of the pulses. In addition, the GTI is used to compensate for the dispersion effects created by broad band optics in the resonator.

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