Douglas W Anthon

6411762, Jun 25, 2002

Nov 23, 1999

09/448101

Douglas Anthon - Wheaton IL
Chris Emslie - Southampton, GB
Peter Maton - Eastleigh, GB

Scientific-Atlanta, Inc. - Lawrenceville GA

G02B 602

385123, 385127

An optical fiber ( ) made with a central core ( ), a first cladding layer ( ), and a second cladding layer ( ) having a series of perturbations or irregularities formed into the otherwise generally circular outer boundary of the first cladding layer ( ). The irregularities in the first cladding layer ( ) interrupt the propagation of skew rays and encourage coupling into the core ( ).

6477301, Nov 5, 2002

Jun 13, 2000

09/593648

Douglas W. Anthon - Wheaton IL
James H. Fisher - Batavia IL

Scientific-Atlanta, Inc. - Lawrenceville GA

G02B 626

385 43, 385 50, 3593411, 3593413

Systems and methods are described for the construction of micro-optical couplers incorporating optical tapers to reshape multimode optical inputs. Incorporating tapers allows the spatial properties of the multimode inputs to be adjusted to match to the spatial properties of the output fiber, even in systems that are limited to unity-magnification imaging optics. In an exemplary embodiment, a larger-core multimode fiber and a smaller-core double-clad fiber are glued into a glass capillary, with the multimode fiber tapering to a smaller diameter inside the capillary. Polishing the capillary to expose the taper gives a multimode core that is smaller than the double-clad core. Imaging with unity magnification through a GRIN lenses and a dichroic reflector transfers the multimode input efficiently to the double-clad fiber with greater efficiency than would have been possible with the same optics and an untapered fiber. The dichroic reflector is transparent to a second singlemode signal input, which is collimated by a second GRIN lens and coupled to through the reflector to the core of the double-clad fiber. An isolator may be included in the signal beam path, and the double-clad fiber may be replaced by a double-clad gain fiber.

6912235, Jun 28, 2005

Jul 31, 2002

10/210039

Douglas W. Anthon - El Cerrito CA, US
Jill D. Berger - Los Gatos CA, US
Alexander A. Tselikov - Fremont CA, US
Stephen J. Hrinya - San Jose CA, US
Howard S. Lee - San Jose CA, US
Alan A. Fennema - San Jose CA, US
Man F. Cheung - Campbell CA, US

Iolon, Inc. - San Jose CA

H01S003/098
H01S003/13

372 2902, 372 18, 372 19, 372 32

An apparatus and method for controlling the phase of a tunable laser is provided. Stabilization of the mode of a laser beam is provided as the laser is tuned to a target frequency. For one embodiment, a laser generates a reference beam and an output beam. The power of each of beam is measured by optical detectors, and a ratio thereof is utilized to detect when a mode hop occurs as the laser is coarsely tuned. The average of the pre and post mode hop ratios is utilized as a control setpoint while finely tuning the laser to the target frequency. Wavelength lockers, optical power dividers and optical detectors are utilized to determine power levels of the reference and output beams while also monitoring frequency characteristics thereof. A control unit utilizes the outputs from the wavelength locker to control the operation of the extended cavity laser during and after tuning.

7221452, May 22, 2007

Aug 7, 2003

10/638061

Jill D. Berger - Los Gatos CA, US
Douglas W. Anthon - El Cerrito CA, US
Fedor A. Ilkov - Sunnyvale CA, US
David A. King - Menlo Park CA, US

Coherent, Inc. - Santa Clara CA

G01J 3/28

356327, 356328, 356334

An apparatus for filtering an input beam of light to produce an output beam of light is provided. The apparatus facilitates tuning an input beam of light to a desired wavelength by directing the input beam of light, via a mirror, onto a diffractive optical element and returning the diffracted portion of the input beam of light as an output beam of light. The apparatus may also include a polarization recovery element adapted for receiving the input beam of light and outputting a first and second spatially offset beam of polarized light. The apparatus may also be configured as a tunable receiver by utilizing a detector to detect a characteristic of a filtered output beam. The output beam may be additionally filtered by a spatial filter.

7515346, Apr 7, 2009

Jul 18, 2006

11/488578

Sergei V. Govorkov - Los Altos CA, US
Douglas William Anthon - El Cerrito CA, US

Coherent, Inc. - Santa Clara CA

G02B 27/30
H01S 3/04

359641, 372 36, 372 34, 372109

Arrangements for combination and fast-axis alignment of fast-axes of diode-laser beams are disclosed. Alignment arrangements include providing each diode-laser with a corresponding alignable fast-axis collimating lens, providing individually alignable mirrors for steering an re-orienting beams from each diode-laser, and providing single diode-laser slab-modules in which the diode-laser beams can be pre-aligned to a common propagation-axis direction, and in which edges and surfaces of the slabs can be used to align the fast and slow-axes of the beams. Beam combination methods include combination by dichroic elements, polarization-sensitive elements, and optical fiber bundles.

7697207, Apr 13, 2010

Feb 4, 2009

12/322601

Sergei V. Govorkov - Los altos CA, US
Sol Peter DiJaili - Moraga CA, US
Douglas William Anthon - El Cerrito CA, US
Luis A. Spinelli - Sunnyvale CA, US

Coherent, Inc. - Santa Clara CA

G02B 27/10
G02B 27/30

359618, 359619, 359641, 372 6, 372 34, 372 36, 372 5012, 372 70, 385 31, 385 33, 385 36, 385 39

Arrangements for combination and fast-axis alignment of fast-axes of diode-laser beams are disclosed. Alignment arrangements include providing each diode-laser with a corresponding alignable fast-axis collimating lens, providing individually alignable mirrors for steering an re-orienting beams from each diode-laser, and providing single diode-laser slab-modules in which the diode-laser beams can be pre-aligned to a common propagation-axis direction, and in which edges and surfaces of the slabs can be used to align the fast and slow-axes of the beams. Beam combination methods include combination by dichroic elements, polarization-sensitive elements, and optical fiber bundles.

20120230352, Sep 13, 2012

Mar 29, 2011

13/074593

John D. Minelly - San Jose CA, US
Sergei V. Govorkov - Los Altos CA, US
Luis A. Spinelli - Sunnyvale CA, US
Douglas William Anthon - El Cerrito CA, US
Jay Michael Ingalls - Folsom CA, US

Coherent, Inc. - Santa Clara CA

H01S 3/30

372 6

A CW fiber-laser includes a gain fiber having a reflector proximity-coupled to one end, with the other end left uncoated. A laser resonator is defined by the reflector and the uncoated end of the gain-fiber. Pump-radiation from two fast-axis diode-laser bar stacks is combined and focused into the uncoated end of the gain-fiber for energizing the fiber. Laser radiation resulting from the energizing is delivered from the uncoated end of the gain-fiber and separated from the pump-radiation by a dichroic minor.

20130028276, Jan 31, 2013

Oct 2, 2012

13/633411

Sergei V. GOVORKOV - Los Altos CA, US
Luis A. SPINELLI - Sunnyvale CA, US
Douglas William ANTHON - El Cerrito CA, US
Jay Michael INGALLS - Folsom CA, US

COHERENT, INC. - Santa Clara CA

H01S 3/067

372 6

A CW ytterbium-doped fiber-laser includes a gain-fiber having a reflector proximity-coupled to one end, with the other end left uncoated. A laser resonator is defined by the reflector and the uncoated end of the gain-fiber. Pump-radiation from fast-axis diode-laser bar-stacks emitting at 915 nm and 976 nm is combined and focused into the uncoated end of the gain-fiber for energizing the fiber. Laser radiation resulting from the energizing is delivered from the uncoated end of the gain-fiber and separated from the pump-radiation by a dichroic minor.