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:
Jun. 07, 2022
Filed:
Dec. 18, 2020
The Regents of the University of Colorado, a Body Corporate, Denver, CO (US);
Government of the United States of America As Represented BY the Secretary of Commerce, Gaithersburg, MD (US);
Jun Ye, Louisville, CO (US);
Eric G. Oelker, Boulder, CO (US);
William R. Milner, Boulder, CO (US);
John M. Robinson, Henderson, NV (US);
Colin J. Kennedy, Boulder, CO (US);
Tobias Bothwell, Boulder, CO (US);
Dhruv Kedar, Boulder, CO (US);
Terry Brown, Lafayette, CO (US);
The Regents of the Univ. of Colorado, a body corp., Denver, CO (US);
Government of the United States of America, as represented by the Secretary of Commerse, Gaithersburg, MD (US);
Abstract
The frequency stability of an optical local oscillator is improved by locking a laser to a silicon Fabry-Perot cavity operating at a temperature near 124 K, where the coefficient of thermal expansion of silicon is near zero. The cavity is mounted inside a cryostat housed in a temperature-stabilized vacuum system that is surrounded by an isolating enclosure and supported by an active vibration platform. Laser light is steered with a superpolished mirror toward a superpolished focusing optic that couples the laser light into the cavity. Light reflected from the cavity is used to stabilize the laser via the Pound-Drever-Hall technique, while light transmitted through the cavity is used to stabilize the laser power. A resonant transimpedance amplifier allows the laser power to be reduced, which reduces heating of the cavity caused by residual absorption of the light.