Dana M Anderson

7126112, Oct 24, 2006

Mar 8, 2005

11/074888

Dana Z. Anderson - Boulder CO, US
Jakob G. J. Reichel - 75014 Paris, FR

H01S 1/00
H01S 3/00
H05H 3/02

250251

A compact vacuum chamber gives electric and optical access to a microchip, which is part of the chamber. The main use of the microchip is to confine, cool and manipulate cold atoms (atom chip). The main new feature is that the microchip forms one wall of a vacuum cell. This makes the chamber compact and lightweight, provides large optical access combined with small overall size, eliminates in-vacuum cabling, and makes the back surface of the chip accessible from the outside (e. g. , for cooling and/or additional field-producing elements).

8405021, Mar 26, 2013

May 19, 2008

12/600821

Dana Z. Anderson - Boulder CO, US
Evan Salim - Boulder CO, US
Matthew Squires - Tewksbury MA, US
Sterling Eduardo McBride - Princeton NJ, US
Steven Alan Lipp - West Windsor NJ, US
Joey John Michalchuk - Lambertville NJ, US

The Regents of the University of Colorado - Denver CO
Sarnoff Corporation - Princeton NJ

H01S 1/00
H01S 3/00
H05H 3/02

250251, 250428, 250430, 250423 R, 250432 R, 250436

Cold-atom systems and methods of handling cold atoms are disclosed. A cold-atom system has multiple chambers and a fluidic connection between two of the chambers. One of these two chambers includes an atom source and the other includes an atom chip.

47737190, Sep 27, 1988

Jul 30, 1987

7/079800

Dana Z. Anderson - Boulder CO
Jack L. Feinberg - Manhattan Beach CA

G03H 102
G02B 2700

350 364

Changes in an image are detectable by a tracking novelty filter while an incorporated holographic medium is in disequilibrium. A suitably doped single-domain barium titanate crystal can serve as the holographic medium. Image information is imposed on a laser beam in the form of a spatially varying polarization across the beam cross section spatial position. The modulated beam is directed to the crystal, which cooperates with a polarizing beam splitter and a half wave plate to define a polarization conjugator. The conjugated beam is passed through the modulator a second time and then operated on by a beam splitter. When the crystal is in equilibrium with the incident laser light, the beam splitter directs minimal light to a detector. However, when an image change causes a change in the applied modulation, the changed image elements are intensified at the detector while the holographic medium is in disequilibrium. In alternative embodiments, phase is the variable modulated.

53275152, Jul 5, 1994

Jan 14, 1993

8/004770

Dana Z. Anderson - Boulder CO
Turan Erdogan - Berkeley Heights NJ
Victor Mizrahi - Bedminster NJ

AT&T Laboratories - Murray Hill NJ

G02B 610

385123

The invention involves a method for making Bragg gratings in glass optical fibers, or other glass optical waveguides, which is relatively insensitive to perturbations in the actinic light used for processing. This method is suitable for mass production and lends itself well to the manufacturing environment. The invention method involves first providing an optical phase grating. An interference pattern is generated by impinging a single light beam on the grating. The optical waveguide to be processed is exposed to this interference pattern, leading to the formation of a Bragg grating in the waveguide.

58899014, Mar 30, 1999

Jun 6, 1997

8/870533

Dana Zachary Anderson - Boulder CO
William Charles Swann - Lafayette CO

University Technology Corporation - Boulder CO

G02B 600

385 12

A condition sensing apparatus/method includes a sensor-fiber-grating that is subjected to a physical condition or measurand (strain/temperature/pressure) that is to be sensed. A broad-band light beam is directed into the core of the sensor grating, and the constructive-interference light beam that is reflected from this sensor grating is directed into a reference-fiber-grating. The reference grating is subjected to a servo-controlled elongation force or strain, and in this manner the length of the reference grating is varied until the reference grating operates to reflect a maximum intensity of its received light beam, and to transmit a minimum intensity of its received light beam. This maximum/minimum condition of the reference grating is sensed by detecting the minimum intensity of a light beam that is transmitted through the reference grating. The physical strain of the reference grating at which this condition occurs is used as a measure of the measurand to which the sensor grating is subjected.

49232991, May 8, 1990

Aug 9, 1988

7/230020

Dana Z. Anderson - Boulder CO
Nicholas Sampas - Boulder CO

University of Colorado Foundation, Inc. - Boulder CO

G01C 1964

356350

Disclosed herein is an improved passive ring laser gyroscope with two systems: common mode and differential mode error systems. The common mode error system modulates counter propagating coherent radiation. The modulated light from a common source is split at a beam splitter before the reasonator cavity and then optically recombined at the same beam splitter for further propagation to an electronic detecting and demodulation servo system. The resulting electronic error signal is used to adjust the ring resonator and the laser so that the frequency output of the coherent radiation of the laser is substantially equal to the resonance frequency of the ring resonator. The differential mode error system optically substracts counter propagating radiation signals emanating from the resonator cavity to form a differential error signal that is detectable by an electronic detector for further processing by demodulation. This output signal is used to servo and drive acousto-optic modulating frequency shifters, one for each counter propagating radiation of the ring resonator. The difference between the frequencies at which the acousto-optic modulators are driven is made equal to the difference between the frequencies of the counter propagating radiation of the ring resonator.

51366665, Aug 4, 1992

Aug 6, 1991

7/741003

Dana Z. Anderson - Boulder CO
Mark E. Saffman - Boulder CO

The University of Colorado Foundation, Inc. - Boulder CO

G02B 628

385 24

In a fiber optic communication system, an acoustooptic modulator operates to provide a coherent light beam that is data encoded in the beam's time domain, for example by intensity modulation of the beam. A spatial light modulator then operates to address encode the beam by modulating the beam in the space domain. The resulting data and address modulated beam possesses the property of orthogonality. This beam is now transmitted to the input of a multimode optical fiber. The speckle pattern that exits the output of the optical fiber also exhibits orthogonality. This output beam is presented to a beam splitter in order to produce two spatially modulated speckle light patterns therefrom. These two beams are then focused onto photorefractive means whereat a hologram is produced. This hologram operates to address decode the beam output of the optical fiber.

20220236060, Jul 28, 2022

Feb 27, 2019

16/287608

- Boulder CO, US
Dana Zachary ANDERSON - Boulder CO, US

ColdQuanta, Inc. - Boulder CO

G01C 19/66

A matter-wave gyro with counter-propagating traps uses three-dimensional lattices formed of interference fringes from three pairs of interfering laser beams. Particles, such as neutral atoms, ion, or molecules are cooled to a ground state near absolute zero. The resulting ultra-cold particles are loaded into the lattices. The laser beams used to form the lattices are driven according to functions that cause the lattices to counter-propagate about a closed path (Sagnac loop) N times, where a desired tradeoff between spatial resolution and temporal resolution can be achieved by choosing an appropriate integer value of N. The lattices can be extinguished so that the particles can be imaged to identify an interference pattern. A shift in the interference pattern relative to an interference pattern that would occur with zero angular momentum can be used to measure angular momentum.