Inventor: David S. Sumida

Address: Los Angeles, CA
No. of patents: 27
Last patent issue date: 08/09/2011

Number	Title	Issue Date
7995631	Solid-state laser with spatially-tailored active ion concentration using valence conversion with surface masking and method A material having a surface and a dopant in the material distributed whereby the material has a spatially variant optical flux density profile. In accordance with the invention, tailored non-uniform gain profiles within a Yb:YAG laser component (rod, slab, disc, etc...	08/09/2011
7724800	Power scaleable thin disk lasers A thin disk laser includes a thin disk of a host material incorporating a laser gain medium. The disk has opposite first and second surfaces, at least one of which is non-planar. The first surface is coated with a high reflectivity coating. The second surface has an...	05/25/2010
7633981	Reverse oxidation post-growth process for tailored gain profile in solid-state devices A laser rod is provided having a tailored gain profile such that the quality of the output beam is enhanced. The laser rod has a concentration of active substitutional ions that is relatively high at the center of the rod and decreases to the surface of the rod. The...	12/15/2009
7535947	Enhanced beam quality from a laser rod using interstitial dopants A laser rod is provided having a tailored gain profile such that the quality of the output beam is enhanced. The laser rod has a concentration of dopant ions having a first valence that is relatively high at the center of the rod and decreases to the surface of the ...	05/19/2009
7382818	Diffusion bonded pump cavity A solid state pump cavity comprising a laser rod encased by diffusion bonding inside an outer cladding. The outer cladding provides the ability to efficiently conduct heat away from the laser rod. The outer cladding is also configured to absorb spontaneous laser rad...	06/03/2008
7295580	Numerical aperture optimization using doped cladding layers A method and apparatus for optimizing the numerical aperture (NA) of a laser active core. The laser active core comprises at least a first and second cladding pair. The first and second cladding pair have at least one NA value. At least one of the first and second c...	11/13/2007
7254152	Optically pumped active mirror with improved performance and reduced parasitics A system and a method for providing more gain while minimizing the potential for parasitic oscillation and amplified spontaneous emissions in an optically pumped optical amplifier or laser system, utilizing a partitioned monolithic gain element. The monolithic gain ...	08/07/2007
7217585	Method for fabricating and using a light waveguide A waveguide is fabricated by first preparing two waveguide precursor pieces. Each waveguide precursor piece includes a single-crystal substrate, and an epitaxial coating layer of an oxide coating material on the substrate. The oxide substrate material preferably com...	05/15/2007
7215696	Electrically pumped semiconductor active mirror with improved performance and reduced parasitics A system and a method for providing more gain while minimizing the potential for parasitic oscillation and amplified spontaneous emissions in an electrically pumped optical amplifier or laser system, utilizing a partitioned monolithic gain element. The monolithic ga...	05/08/2007
7089796	Time-reversed photoacoustic system and uses thereof A remote mass is excited with one or more beams, and the surface vibrations of the excited mass are detected with one or more laser vibrometers. Each vibrometer generates a signal indicative of the surface vibrations which is stored, reversed in time, and applied to...	08/15/2006
6996137	Solid-state devices with radial dopant valence profile A solid state, laser light control device (20, 30) and material (10), and methods of producing same. The device (20, 30) and material (10) consist essentially of a host material (14) which contains: a dopant species (16) at ...	02/07/2006
6987789	Multiple-disk laser system A laser system for producing a laser beam, the laser system having top and bottom heat-sinking bars forming the structure of the laser system and plurality of disks comprising a laser material mounted on both the bottom heat-sinking bar and the top heat-sinking bar....	01/17/2006
6973830	Time-reversed photoacoustic system and uses thereof A remote mass is excited by a plurality of beams generated sequentially by each one of a plurality of time reversal mirrors, and the surface vibrations of the excited mass are detected by a laser vibrometer in each of the time reversal mirrors. Each vibrometer gener...	12/13/2005
6895152	Guided-mode laser apparatus with improved cladding structure and a method of fabricating thereof A solid state waveguided structure a core fabricated of a lasing medium, diffusion-bonded to a cladding fabricated of a laser-inactive material. The medium of the core comprises a lutetium-aluminum-garnet material doped with ions of ytterbium, lutetium-aluminum-garn...	05/17/2005
6891987	Multi-aperture beam steering system with wavefront correction based on a tunable optical delay line A true-time delay feeder for multiple aperture beam steering devices. The feeder comprises a plurality of tunable time delay modules. The tunable time delay modules provide different delays to different beamlets without changing the spectrum of each beamlet. The tun...	05/10/2005
6845111	Laser apparatus with improved thermal stress resistance A laser apparatus, comprising a layer fabricated of a lasing medium, the layer having a top surface and a bottom surface, and a first substrate layer fabricated of a laser-inactive material, the first substrate being diffusion-bonded to the layer of lasing medium, w...	01/18/2005
6809991	Method and apparatus for detecting hidden features disposed in an opaque environment An excitation signal is selected and transmitted, and a signal is received containing information produced by a remote object in response to the excitation signal. The information is evaluated to attempt to identify the object, the excitation signal is adjusted on t...	10/26/2004
6646793	High gain laser amplifier A high gain optical amplifier and method. Generally, the inventive amplifier includes a first crystal having an axis and a first index of refraction and a second crystal bonded to the first crystal about the axis and having a second index of refraction. T...	11/11/2003
6330256	Method and apparatus for non-dispersive face-cooling of multi-crystal nonlinear optical devices A face-cooling scheme is used with multiple nonlinear crystal formats used primarily for second harmonic generation without the need for air-path rephasing between the crystals. Birefringent crystals, e.g., MgF2, are cut and oriented such that ...	12/11/2001
6246711	Integrating diode pump cavity for an Er, Yb:glass laser A multi-pass, integrating diode pump cavity for an Er,Yb:glass laser is provided. The diode pump cavity comprises two end members of undoped glass sandwiching a center section of glass of the same composition as that of the two end members but doped with ...	06/12/2001
5974061	Laser pump cavity apparatus with improved thermal lensing control, cooling, and fracture strength and method A laser pump cavity apparatus with integral concentrator provides improved thermal lensing control, cooling and fracture strength. The concentrator is formed around a doped solid-state laser medium by diffusion bonding, using a material different than the...	10/26/1999
5847871	Monolithic multifunctional optical elements Optical apparatus that combines a plurality of separate optical functions into a single monolithic optical element. The the optical element comprises two or three optical functions, such as saturable absorption, retroreflection, and polarization rotation....	12/08/1998
5761233	Monolithic pump cavity and method A high-Q pump cavity is formed from undoped crystal pieces that are diffusion bonded to a doped core of the same crystal host material. The resulting monolithic pump cavity has 2 opposing convex-curved sides which have a highly-reflective coating on their...	06/02/1998
5724372	Diode-pumped laser system using uranium-doped Q-switch A laser system includes a laser resonator cavity having a resonant path and an Er,Yb:glass lasing element with an output of from about 1.5 to about 1.6 micrometers within the laser resonator cavity. A diode array optically pumps the lasing element to emit...	03/03/1998
5652756	Glass fiber laser system using U-doped crystal Q-switch A glass fiber laser system includes a laser resonator cavity having a resonant path and an erbium-doped glass fiber lasing element with an output of from about 1.5 to about 1.6 micrometers within the laser resonator cavity. A light source directed into an...	07/29/1997
5303256	Quasi-monolithic saturable optical element Saturable absorption, polarization, and retroreflection are integrated into a single solid-state optical element. The optical element comprises an undoped substrate having front and rear surfaces disposed at a predetermined angle. A dielectric coating is ...	04/12/1994
5272710	Stress-free mounting and protection of liquid-cooled solid-state laser media A laser structure that reduces thermally-induced mounting stress on low fracture strength solid-state laser rods. A transparent sleeve of relatively high strength optical material that has relatively high thermal conductivity is provided around the laser ...	12/21/1993

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Inventor: David S. Sumida