Nan Jun Yu

US Patent:

7665891, Feb 23, 2010

Filed:

Sep 20, 2007

Appl. No.:

11/858318

Inventors:

Anatoliy A. Savchenkov - Glendale CA, US
Nan Yu - Arcadia CA, US
Lute Maleki - Pasadena CA, US
Vladimir S. Iltchenko - Arcadia CA, US
Andrey B. Matsko - Pasadena CA, US
Dmitry V. Strekalov - Arcadia CA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

G01K 11/26
G01K 1/00
G01H 1/14
G01H 3/04

US Classification:

374117, 374130, 374127, 374120, 73579, 382 28

Abstract:

A differential temperature sensor system and method of determining a temperature shift of an optical resonator and its surroundings are provided. The differential temperature sensor system includes a light generating device capable of generating a beam having a carrier frequency, a modulator capable of modulating the beam with a sideband frequency, and an optical resonator capable of supporting an ordinary mode and an extraordinary mode. The system includes an ordinary mode-lock setup capable of locking the carrier frequency of the beam to the ordinary mode of the optical resonator and an extraordinary mode-lock setup capable of locking the sideband frequency of the beam to the extraordinary mode of the optical resonator by providing a specific radio frequency to the modulator substantially corresponding to a frequency shift between the ordinary mode and the extraordinary mode of the optical resonator resulting from a temperature change of the optical resonator. A processor precisely calculates the differential temperature based upon the frequency shift between the ordinary mode and extraordinary mode of the optical resonator.

US Patent:

8111402, Feb 7, 2012

Filed:

Apr 3, 2009

Appl. No.:

12/418525

Inventors:

Thanh M. Le - Duarte CA, US
Nan Yu - Arcadia CA, US
Anatoliy Savchenkov - Glendale CA, US
William H. Steier - San Marino CA, US

Assignee:

OEwaves, Inc. - Pasadena CA
California Institute of Technology - Pasadena CA
University of Southern California - Los Angeles CA

International Classification:

G01B 9/02

US Classification:

356491, 356480

Abstract:

Techniques and devices based on transverse magnetic (TM) and transverse electric (TE) modes in an optical resonator or interferometer to provide sensitive optical detection with insensitivity to a change in temperature. A shift in a difference between a first resonance wavelength of a TE optical mode and a second resonance wavelength of a TM optical mode is measured to measure a change in a sample that is in optical interaction with the optical resonator or interferometer. For example, the detected shift can be used to measure a change in a refractive index of the sample.

US Patent:

8164816, Apr 24, 2012

Filed:

Sep 2, 2008

Appl. No.:

12/203143

Inventors:

Anatoliy Savchenkov - Glendale CA, US
Andrey B. Matsko - Pasadena CA, US
Nan Yu - Arcadia CA, US
Vladimir Ilchenko - Arcadia CA, US

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

G02F 1/03

US Classification:

359245

Abstract:

Techniques and devices that stabilize optical resonators.

US Patent:

8210044, Jul 3, 2012

Filed:

Oct 14, 2008

Appl. No.:

12/288011

Inventors:

Nan Yu - Arcadia CA, US
Andrey B. Matsko - Pasadena CA, US
Anatoliy Savchenkov - Glendale CA, US

Assignee:

California Institute of Technology - Pasadena CA

International Classification:

G01N 29/24
G01N 29/46

US Classification:

73643

Abstract:

Designs of single-beam laser vibrometry systems and methods. For example, a method for detecting vibrations of a target based on optical sensing is provided to include operating a laser to produce a laser probe beam at a laser frequency and modulated at a modulation frequency onto a target; collecting light at or near the laser to collect light from the target while the target is being illuminated by the laser probe beam through an optical receiver aperture; using a narrow-band optical filter centered at the laser frequency to filter light collected from the optical receiver aperture to transmit light at the laser frequency while blocking light at other frequencies; using an optical detector to convert filtered light from the narrow-band optical filter to produce a receiver electrical signal; using a lock-in amplifier to detect and amplify the receiver electrical signal at the modulation frequency while rejecting signal components at other frequencies to produce an amplified receiver electrical signal; processing the amplified receiver electrical signal to extract information on vibrations of the target carried by reflected laser probe beam in the collected light; and controlling optical power of the laser probe beam at the target to follow optical power of background illumination at the target.

US Patent:

20040109217, Jun 10, 2004

Filed:

Apr 9, 2003

Appl. No.:

10/410873

Inventors:

Nan Yu - Arcadia CA, US

International Classification:

G02F001/01
G02B026/00

US Classification:

359/239000

Abstract:

Opto-electronic oscillators having a frequency locking mechanism to stabilize the oscillation frequency of the oscillators to an atomic frequency reference. Whispering gallery mode optical resonators may be used in such oscillators to form compact atomic clocks.

US Patent:

20160266319, Sep 15, 2016

Filed:

Mar 14, 2016

Appl. No.:

15/069725

Inventors:

- Pasadena CA, US
Nan Yu - Arcadia CA, US
Lukas M. Baumgartel - Portland OR, US

International Classification:

G02B 6/293
G06F 17/13
G02B 27/00

Abstract:

A method for fabricating a resonator structure, comprising engineering dispersion of electromagnetic radiation guided along a boundary of an axially symmetric substrate, the engineering comprising micro-structuring a geometry of the boundary, wherein the structure defines a waveguide for electromagnetic radiation.

US Patent:

20150002921, Jan 1, 2015

Filed:

Jun 21, 2013

Appl. No.:

13/924401

Inventors:

Nan Yu - Arcadia CA, US
Dmitry V. Strekalov - Arcadia CA, US
Guoping Lin - Pasadena CA, US

Assignee:

CALIFORNIA INSTITUTE OF TECHNOLOGY - Pasadena CA

International Classification:

G02F 1/37
G02F 1/355
G02F 1/35

US Classification:

359328

Abstract:

An optical resonator fabricated from a uniaxial birefringent crystal, such as beta barium borate. The crystal is cut with the optical axis not perpendicular to a face of the cut crystal. In some cases the optical axis lies in the plane of the cut crystal face. An incident (input) electromagnetic signal (which can range from the infrared through the visible to the ultraviolet) is applied to the resonator. An output signal is recovered which has a frequency that is an integer multiple of the frequency of the input signal. In some cases a prism is used to evanescently couple the input and the output signals to the resonator.