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Coherent, Inc. Patents
Assignee:
Coherent, Inc.
Address:
Santa Clara, CA
No. of patents:
400
Patents:


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Patent Number Title Of Patent Date Issued
RE42499 System and method for amplifying an optical pulse and pumping laser therefor June 28, 2011
An efficient, powerful and reliable system for amplifying optical pulses. Seed-pulses are generated by a seed-pulse source and are transmitted to an optical amplifier for amplification. The power for the amplification is provided by a Q-switched, diode-pumped, intracavity-doubled pump
RE33729 Multilayer optical filter for producing colored reflected light and neutral transmission October 29, 1991
A short-wave-pass optical filter, that includes a partially absorbing or transparent substrate coated by a set of layers having specified quarter-wave optical thickness, and is designed to reflect visible radiation of a selected color while transmitting visible radiation and maintain
D407031 Laser power meter March 23, 1999
D341200 Fiber optic handpiece November 9, 1993
8582616 Edge-emitting semiconductor laser with photonic-bandgap structure formed by intermixing November 12, 2013
A separate-confinement heterostructure, edge-emitting semiconductor laser having a wide emitter width has elongated spaced apart intermixed and disordered zones extending through and alongside the emitter parallel to the emission direction of the emitter. The intermixed zones inhibit
8582611 Frequency-tripled fiber-MOPA November 12, 2013
In a frequency-tripled fiber-MOPA, a pre-amplified plane-polarized seed-pulse having a fundamental frequency is divided into two pulse-components, plane-polarized in polarization-orientations at 90-degrees to each other. The fundamental-wavelength pulse-components are amplified in a
8290017 Hermetically-sealed RF feed-through with integrated capacitor October 16, 2012
A carbon-dioxide (CO.sub.2) gas-discharge slab laser includes elongated discharge-electrodes in a sealed enclosure. Radio Frequency (RF) power is supplied to the electrodes via an impedance matching network and a co-axial electrical low inductance transmission line feed-through sealed
8265116 Hermetically-sealed RF feed-through with integrated capacitor September 11, 2012
A carbon-dioxide (CO.sub.2) gas-discharge slab laser includes elongated discharge-electrodes in a sealed enclosure. Radio Frequency (RF) power is supplied to the electrodes via an impedance matching network and a co-axial electrical low inductance transmission line feed-through sealed
8243765 Intracavity frequency-converted optically-pumped semiconductor optical parametric oscillator August 14, 2012
In a branched resonator OPS-laser arrangement, a combination of intra-cavity optical parametric generation and intra-cavity frequency conversion provides output radiation in a range between about 550 nanometers about 800 nanometers from an OPS fundamental wavelength in a range betwee
8233513 Broad-area edge-emitting semiconductor laser with limited thermal contact July 31, 2012
A diode-laser having an elongated diode-laser emitter is mounted on a relatively massive heat-sink. Two parallel grooves are machined into the heat-sink to leave a relatively narrow elongated ridge of the heat-sink between the grooves. The ridge has a width about equal to or narrower
8201954 Compensation for transient heating of laser mirrors June 19, 2012
A mirror assembly for a carbon dioxide (CO.sub.2) slab laser resonator includes a center section having a rectangular cross-section and a pair of thermal balancing bars. A concave reflecting surface formed on a front edge of a center section. The side-bars are attached to either side of
8199789 Arrangement for RF power delivery to a gas discharge laser with cascaded transmission line secti June 12, 2012
RF power is transmitted to a CO.sub.2 gas discharge laser form a source of RF power via a series combination of transmission line sections. The lengths and characteristic impedances of the transmission line sections are selected to transform the impedance of the RF power source to the
8174751 Two frequency resonantly excited MEMS mirror for diode-laser marker May 8, 2012
Apparatus for marking a bitmap image on tape includes a scanning mirror which is incorporated in a micro-electro-mechanical system (MEMS). The MEMS is torsionally resonant at two frequencies one being about three time the other. The MEMS is excited to resonance by applying an AC signal
8170073 Optically-pumped external-cavity surface-emitting semiconductor lasers with front-cooled gain-st May 1, 2012
A semiconductor gain-structure functions as a gain-element in a laser-resonator. The gain-structure is bonded to a diamond heat-spreader that is peripherally cooled by a heat-sink configured to allow access to the gain-structure by laser-radiation circulating in the laser-resonator.
8160115 Two-dimensional diode-laser array with broad-band output April 17, 2012
It is demonstrated that substantial operating-parameter-dependent temperature-differences can exist between diode-laser bars in pulsed operation of a stack of such bars arranged to provide a two-dimensional array of diode-laser emitters. These differences can produce distortion of th
8129684 Detection of hidden objects by terahertz heterodyne laser imaging March 6, 2012
A THz-frequency heterodyne imaging method is used to remotely detect objects concealed in or under a person's clothing. One THz-frequency beam is scanned over a person being examined. A portion of the beam penetrates the persons clothing and is reflected by an object concealed under the
8116346 CO.sub.2 laser output power control during warm-up February 14, 2012
A CO.sub.2 gas discharge laser includes a housing enclosing spaced-apart electrodes and a lasing gas. A laser resonator extends between the spaced-apart electrodes. An RF power supply provides RF power for creating a discharge in the lasing gas, causing laser radiation to be delivere
8050306 Acousto-optically Q-switched CO.sub.2 laser November 1, 2011
A pulsed CO.sub.2 laser is Q-switched by an intracavity acousto-optic (AO) Q-switch including an AO material transparent at a fundamental wavelength of the laser. In one example the AO material is germanium.
8047663 Beam dump for a very-high-intensity laser beam November 1, 2011
A beam terminator for a high-power laser beam comprises a thermally conductive body including a beam-trapping chamber. A tapered spiral channel extends into the conductive body for guiding the beam. The beam is partially absorbed while propagating along the channel to the trapping ch
8000372 Traveling-wave laser having a resonator including a direction-sensitive interferometer for estab August 16, 2011
A laser includes a traveling-wave ring-resonator in which one resonator mirror is a mirror of an interferometer arranged such that, when the interferometer is operated in an anti-resonant condition, the mirror has a greater effective reflectivity for clockwise circulation of light in
7991026 Intracavity frequency-converted optically-pumped semiconductor laser with red-light output August 2, 2011
In a branched resonator OPS-laser arrangement, a combination of intra-cavity optical parametric generation and intra-cavity sum-frequency mixing provides output radiation in a range between about 550 nanometers about 700 nanometers from an OPS fundamental wavelength in a range betwee
7970038 Slab laser with stand-off for ceramic spacers June 28, 2011
An RF excited gas discharge laser is disclosed including a housing holding the lasing gas. An electrode assembly is mounted within the housing. The electrode assembly includes a pair of elongated planar electrodes mounted in face to face relationship with a narrow gap therebetween. A
7970037 Arrangement for RF power delivery to a gas discharge laser with cascaded transmission line secti June 28, 2011
RF power is transmitted to a CO.sub.2 gas discharge laser form a source of RF power via a series combination of transmission line sections. The lengths and characteristic impedances of the transmission line sections are selected to transform the impedance of the RF power source to the
7965757 Thermal distortion compensation for laser mirrors June 21, 2011
A laser mirror assembly is disclosed with improved pointing stability. An elongated mirror includes a concave reflecting portion. A pair of elongated planar portions extend parallel to the concave reflecting portion on either side thereof. The planar portions are stepped down from th
7961370 Two frequency resonantly excited MEMS mirror for diode-laser marker June 14, 2011
Apparatus for marking a bitmap image on tape includes a scanning mirror which is incorporated in a micro-electro-mechanical system (MEMS). The MEMS is torsionally resonant at two frequencies one being about three time the other. The MEMS is excited to resonance by applying an AC signal
7952806 Multicolor diode-laser module May 31, 2011
A multi-laser module includes two compartments arranged one above the other. The lower compartment includes four lasers and four corresponding beam-steering mirrors arranged to direct corresponding laser beams into the upper compartment. The upper compartment includes a regular penta
7952603 Diode-laser marker with one-axis scanning mirror mounted on a translatable carriage May 31, 2011
Apparatus for marking a bitmap image on tape includes a source of a modulatable laser-beam. The beam is directed to an oscillating mirror on a carriage translatable across the width direction of the tape. The oscillating mirror directs the beam to a focusing lens mounted on the carri
7952602 Wide field diode-laser marker with swinging projection-optics May 31, 2011
Apparatus for laser-marking on tape includes a laser arranged to emit a modulated beam of laser-radiation. Projection-optics are arranged to focus a beam to a spot on the tape. The tape is driven under the focal spot for scanning the beam in the length direction of the tape. The proj
7944305 RF pre-amplifiers and power amplifiers May 17, 2011
An RF amplifier circuit includes a MOSFET connected to an RF output of the circuit via an impedance matching network including an inductor and a tuning capacitor connected in parallel with the inductor and the MOSFET. DC voltage is applied to the MOSFET via a series path through a radio
7920606 Frequency-tripled fiber MOPA April 5, 2011
Fundamental-wavelength pulses from a fiber a laser are divided into two portions and the two portions are separately amplified. One of the amplified fundamental-wavelength pulse-portions is frequency-doubled. The frequency doubled portion is sum-frequency mixed with the other amplified
7916764 Output power control for harmonic-generating laser March 29, 2011
In harmonic-generating laser apparatus, plane-polarized fundamental radiation of a laser is converted to harmonic radiation by an optically nonlinear crystal. The power of harmonic radiation generated by the apparatus is selectively varied by selectively rotating the plane of polariz
7903711 Separate confinement heterostructure with asymmetric structure and composition March 8, 2011
A separate confinement heterostructure includes a quantum-well layer bounded by an n-side waveguide layer and a p-side waveguide layer. The waveguide layers guide a lasing mode of the heterostructure. The n-side waveguide layer is composed of indium gallium phosphide (InGaP) and the
7903699 Acousto-optically Q-switched CO.sub.2 laser March 8, 2011
A pulsed CO.sub.2 laser is Q-switched by an intracavity acousto-optic (AO) Q-switch including an AO material transparent at a fundamental wavelength of the laser. In one example the AO material is germanium.
7894493 Ultrashort seed-pulse generating laser with integral pulse shaping February 22, 2011
An ultrafast laser for delivering ultra-short duration seed-pulses for further amplification has a resonator including negative group delay dispersion (NGDD) mirrors for minimizing increases in the duration of the pulses due to positive group delay dispersion effects inherent in the
7891821 Laser beam transformer and projector having stacked plates February 22, 2011
An original laser-radiation beam having a symmetrical M.sup.2 but poor beam quality is sliced in one transverse axis, by a fanned-out stack of parallel transparent plates, into a plurality of beam slices. The beam-slices are also spread by the stack of plates in another transverse ax
7889775 Particle damage protection for high power CO.sub.2 slab laser mirrors February 15, 2011
A CO.sub.2 gas discharge laser includes elongated planar live and ground electrodes vertically spaced and electrically insulated from each. The electrodes are spaced apart by ceramic spacer strips arranged along the edges of the electrodes. An auxiliary electrode is located at each end o
7885308 Frequency-agile RF-power excitation for driving diffusion-cooled sealed-off, RF-excited gas lase February 8, 2011
A gas discharge laser includes a laser housing including a laser gas and an electrode-assembly for lighting a discharge in the laser gas. The electrode assembly has a first resonant frequency when the discharge is not lit and a second resonant frequency when the discharge is lit. RF
7881349 External-cavity optically-pumped semiconductor-laser with a resonator stop February 1, 2011
An optically pumped semiconductor-laser (OPS-laser) resonator includes an arrangement for delivering optical pump radiation on an OPS-chip to cause fundamental radiation to circulate in the resonator. The resonator includes second and third-harmonic generating crystals and is arranged
7843653 Achromatic flat top beam shaping November 30, 2010
There is provided an optical system and method for shaping a polychromatic light into a substantially uniform profile beam along a first axis. A polychromatic divergent light with having multiple wavelength components is provided with a dispersion of divergence. A collimation optic c
7843479 Method for providing a plurality of laser-printed labels from a medium supported on a disc November 30, 2010
A method of printing labels includes supporting a laser sensitive material on a disc and printing label images on the disc with a modulated focused beam from a diode-laser. The label images may be printed in regions of the medium having pre-cut label boundaries. Alternatively, label
7822080 High power pulsed fiber laser October 26, 2010
A high power fiber laser includes a pump source optically coupled to a first fiber laser, which is in turn optically coupled to a second fiber laser. The pump source is adapted to generate light, which is received by the first fiber laser and used to generate a first pulsed output. The
7804879 Gas laser electrodes shaped in the longitudinal axis September 28, 2010
A gas discharge laser includes elongated discharge electrodes having an active surface width that varies along the length of the resonator. In one example each of the electrodes is formed by a row of pins having a circular active surface. The pins are diametrically aligned with the a
7787506 Gain-switched fiber laser system August 31, 2010
This invention discloses a method to control laser dynamics in a gain-switched fiber laser so as to generate stable, clean pulses in an all-fiber format. The gain-switched fiber laser is suitable as a standalone laser source, and as a pump source for harmonic generation and an optica
7782920 Edge-emitting semiconductor laser with photonic-bandgap structure formed by intermixing August 24, 2010
A separate-confinement heterostructure, edge-emitting semiconductor laser having a wide emitter width has elongated spaced apart intermixed and disordered zones extending through and alongside the emitter parallel to the emission direction of the emitter. The intermixed zones inhibit
7760788 Bandwidth-limited and long pulse master oscillator power oscillator laser systems July 20, 2010
Laser systems have a line-narrowed master oscillator and a power oscillator for amplifying the output of the master oscillator. The power oscillator includes optical arrangements for limiting the bandwidth of radiation that can be amplified. The limited amplification bandwidth of the
7760772 Cavity-dumped pulsed solid-state laser with variable pulse-duration July 20, 2010
In a cavity-dumped, repetitively-pulsed, solid-state laser cavity dumping is protracted over a predetermined time longer than a round-trip time of the resonator of the laser. The cavity dumping is effected by a Pockels cell optical switch. During a dumping period a voltage applied to the
7756186 Unstable resonator with variable output coupling July 13, 2010
Through the use of a relatively inexpensive third mirror on a novel folded hybrid unstable resonator configuration, the optimum output coupling for a given laser design can be explored quickly and easily with a minimum of intracavity mirror alignment. No changes in either the radii of cu
7756184 Electrodes for generating a stable discharge in gas laser system July 13, 2010
Arcing is minimized in a discharge chamber of a gas laser system by utilizing an electrode which comprises a surface portion capable of functioning as one of an anode and a cathode in order to energize a gas mixture in a discharge chamber of the gas discharge laser system, a shoulder
7756182 RF excited CO.sub.2 slab laser tube housing and electrodes cooling July 13, 2010
The laser tube housing of a CO.sub.2 slab laser is provided with a cooling system in which coolant fluid tubes are inserted into hollowed out portions formed in the longitudinal sidewalls of the laser tube housing; mounting the coolant fluid tubes in this way provides for enhanced co
7755452 Power combiner July 13, 2010
An RF power combiner used to combine an output received from a plurality of power amplifiers. The combined output is used to operate a gas discharge laser. In some embodiments, the power combiner consists of a network of transformers that provide an output to a load. In other embodim
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