The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1992
Filed:
Oct. 07, 1991
Daniel K Negus, La Honda, CA (US);
Timothy Johnston, Mt. View, CA (US);
Coherent, Inc., Palo Alto, CA (US);
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.