| Coherent, Inc. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120113996 | LINE-PROJECTION APPARATUS FOR ARRAYS OF DIODE-LASER BAR STACKS - In optical apparatus for illuminating a mask-plane with a line of light, a light source includes four fast-axis stacks of laser diode bars with fast and slow axis collimating arrangements providing four collimated beams of diode-laser light. A combination of a lens element and two diffraction gratings collects the four collimated beams and spreads the beams in the fast-axis direction such that the spread beams overlap in the mask plane to form a line of light having a length in the fast-axis-direction and a width in the slow-axis direction of the diode-laser bar stacks. | 05-10-2012 |
| 20120086519 | IMPEDANCE-MATCHING CIRCUITS FOR MULTI-OUTPUT POWER SUPPLIES DRIVING CO2 GAS-DISCHARGE LASERS - Electrical apparatus for connecting a radio frequency power-supply having two outputs to a load includes two radio frequency transmission-lines, each one connected to a corresponding power-supply output. A transformer arrangement connects the two transmission-lines to the load. Each transmission-line includes a series-connected pair of twelfth-wave transmission-line sections. The series-connection between the twelfth wave transmission-line sections in one transmission line is connected to the series-connection between the twelfth-wave transmission-line sections in the other by a device having an adjustable impedance. | 04-12-2012 |
| 20120063010 | LARGE-FIELD UNIT-MAGNIFICATION CATADIOPTRIC PROJECTION SYSTEM - A unit magnification projection optical system includes, listed in order along a system axis, a mirror, a lens group having negative power and a lens group having positive power. The optical system is a symmetric system, with an object plane on one side of the system axis and an object plane on an opposite side of the system axis. The object and image planes are spaced apart from the positive lens group by a working distance greater than 100 millimeters. | 03-15-2012 |
| 20120057345 | LINE-PROJECTION APPARATUS FOR ARRAYS OF DIODE-LASER BAR STACKS - In optical apparatus for illuminating a mask-plane with a line of light, a light source includes four fast-axis stacks of laser diode bars. One optical arrangement collects light beams from all of the diode-laser bar stacks, homogenizes and expands the beams in the fast-axis direction of the diode-laser bar stacks and partially overlaps the homogenized and expanded beams in the fast-axis direction. Another optical arrangement homogenizes the sum of the partially overlapped beams and images the sum of the beams as a line of light having a length in the fast-axis-direction and a width in the slow-axis direction. | 03-08-2012 |
| 20120033703 | HERMETICALLY-SEALED RF FEED-THROUGH WITH INTEGRATED CAPACITOR - A carbon-dioxide (CO | 02-09-2012 |
| 20120033692 | OPTICAL PUMPING OF A SOLID-STATE GAIN-MEDIUM USING A DIODE-LASER BAR STACK WITH INDIVIDUALLY ADDRESSABLE BARS - A diode-laser bar stack includes a plurality of diode-laser bars having different temperature dependent peak-emission wavelengths. The stack is arranged such that the bars can be separately powered. This allows one or more of the bars to be “on” while others are “off”. A switching arrangement is described for selectively turning bars on or off, responsive to a signal representative of the temperature of the diode-laser bar stack, for providing a desired total emission spectrum. | 02-09-2012 |
| 20110310468 | HYBRID FIBER-MOPA - A master oscillator power-amplifier stages includes multiple stages of fiber-amplification with a final power amplifier stage in the form of a multi-pass amplifier. With a thin-disk gain medium in one example the thin-disk amplifier includes a common optical arrangement for providing multiple incidences of radiation to be amplified and multiple incidences of a pump-radiation beam on the thin-disk gain medium. | 12-22-2011 |
| 20110285473 | IMPEDANCE-MATCHING TRANSFORMERS FOR RF DRIVEN CO2 GAS DISCHARGE LASERS | 11-24-2011 |
| 20110249698 | POLARIZATION MAINTAINING MULTI-PASS IMAGING SYSTEM FOR THIN-DISK AMPLIFIERS AND OSCILLATORS - Multi-pass optical imaging apparatus includes a concave mirror in combination with two retro-reflecting mirror pairs and at least one reflective surface. The mirror, the retro-reflecting minor pairs and the reflecting surface are arranged such that a light-ray input into the apparatus parallel to and spaced apart from the optical axis of the concave mirror and incident on the concave mirror is caused to be incident on the thin-disk gain-medium at least four times, with each of the four incidences on the gain-medium being from a different direction. If the input ray is plane-polarized, the arrangement provides that the polarization orientation of the ray on each incidence on the gain-medium is in the same orientation. | 10-13-2011 |
| 20110194581 | ARRANGEMENT FOR RF POWER DELIVERY TO A GAS DISCHARGE LASER WITH CASCADED TRANSMISSION LINE SECTIONS - RF power is transmitted to a CO | 08-11-2011 |
| 20110188103 | TWO FREQUENCY RESONANTLY EXCITED MEMS MIRROR FOR DIODE-LASER MARKER - 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 to the actuators, causing the mirror to oscillate. The AC signal has components at the two frequencies. The magnitude and phase-relationship of the components can be selected such that the mirror oscillates in an approximation of a triangle-wave. | 08-04-2011 |
| 20110182319 | CO2 LASER OUTPUT POWER CONTROL DURING WARM-UP | 07-28-2011 |
| 20110164104 | DIODE-LASER MARKER WITH ONE-AXIS SCANNING MIRROR MOUNTED ON A TRANSLATABLE CARRIAGE - 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 carriage. The focusing lens is arranged to focus the beam to a focal-spot on the tape. As the carriage is translated, the focal-spot is swept reciprocally in a wave-like path across the tape. Modulation of the beam is arranged such that pixels of a plurality of rows of the bitmap image are printed in one traverse of the carriage. The tape is advanced incrementally and repeated traverses of the carriage are made to complete printing of the bitmap image. | 07-07-2011 |
| 20110150013 | RESONANT PUMPING OF THIN-DISK LASER WITH AN OPTICALLY PUMPED EXTERNAL-CAVITY SURFACE-EMITTING SEMICONDUCTOR LASER - Laser apparatus comprises a solid-state laser-resonator including a thin-disk solid-state gain-medium. The thin-disk gain medium is optically pumped using radiation circulating in an OPS-laser resonator. The solid-state laser-resonator can be a passively mode-locked or actively Q-switched laser-resonator. | 06-23-2011 |
| 20110128609 | BEAM STEERING USING A THERMALLY ANISOTROPIC MEDIUM - Apparatus for steering a beam of radiation includes a thermally anisotropic element configured such that the shape of the optical element can be varied by varying the temperature of the element. The beam is reflected from or transmitted through the element in a manner such that the direction of the beam on leaving the element can be varied by the change of shape resulting from the temperature variation. | 06-02-2011 |
| 20110122897 | ACOUSTO-OPTICALLY Q-SWITCHED CO2 LASER - A pulsed CO | 05-26-2011 |
| 20110085580 | PRE-IONIZATION METHOD FOR CO2 GAS-DISCHARGE LASER - An RF powered CO | 04-14-2011 |
| 20110085575 | DIGITAL PULSE-WIDTH-MODULATION CONTROL OF A RADIO FREQUENCY POWER SUPPLY FOR PULSED LASER - A pulse width modulation method for controlling the output power of a pulsed gas discharge laser powered by a pulsed RF power supply comprises delivering a train of digital pulses to the RF power supply. Each pulse in the train has an incrementally variable duration. The power supply is arranged to deliver a train of RF pulses corresponding in number and duration to the train of digital pulses received. The average power in the RF-pulse train can be varied by incrementally varying the duration of one or more of the digital pulses in the digital pulse train. The train of RF pulses is used to power a gas discharge laser. The gas discharge laser outputs a pulse train corresponding to the RF pulse train. | 04-14-2011 |
| 20110082447 | LENSED DUAL-CHIP FIBER-COUPLER FOR PROVIDING AN AIMING BEAM IN AN INFRARED RADIATION DELIVERY APPARATUS - Laser treatment apparatus includes one diode-laser providing infrared radiation for the treatment and another diode-laser for providing visible radiation. A lens launches the infrared and visible radiations from the diode-lasers into the entrance face of the optical fiber for transporting the radiations to a treatment location. | 04-07-2011 |
| 20110069376 | FIBER MOPA WITH AMPLIFYING TRANSPORT FIBER - Frequency-multiplied fiber-MOPA apparatus includes one enclosure containing a master oscillator and fiber amplifier stages and another enclosure containing frequency-multiplying stages. Radiation is transmitted between the enclosures by a transport fiber in a flexible jacket or enclosure. The transport fiber functions additionally as a power amplifier fiber, and amplifies the radiation while transporting the radiation between the enclosures. The amplifying transport fiber is energized by diode-lasers in the enclosure containing the master oscillator and fiber amplifiers. | 03-24-2011 |
| 20110064099 | OPTICALLY-PUMPED EXTERNAL-CAVITY SURFACE-EMITTING SEMICONDUCTOR LASERS WITH FRONT-COOLED GAIN-STRUCTURES - 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. In one example, the gain-structure is used as a transmissive gain-structure in a traveling-wave ring-resonator. In another example, the gain-structure surmounts a mirror-structure which functions as an end-mirror of a standing-wave laser-resonator. | 03-17-2011 |
| 20110038031 | PULSED FIBER-MOPA WITH WIDELY-VARIABLE PULSE-DURATION - Master oscillator power amplifier (MOPA) apparatus includes two seed-pulse sources coupled to a single fiber amplifier including one or more stages of amplification. One of the seed-pulse sources is a single-mode source generating pulses having a duration selectively variable between about 0.1 ns and 10 ns. The other seed-pulse source is a multi-mode source generating pulses having a duration selectively variable between about 1 ns and 10 μs. Selectively operating one or the other of the seed-pulse sources provides that the apparatus can deliver pulses selectively variable in a range between about 0.1 ns and 10 μs. | 02-17-2011 |
| 20110019267 | CARRIER ENVELOPE PHASE STABILIZATION OF AN OPTICAL AMPLIFIER - A laser and amplifier combination delivers a sequence of optical pulses. Pulses from the laser are temporally stretched by a pulse stretcher before amplification and temporally compressed by a pulse compressed after amplification. The pulse stretcher includes a diffraction grating on which pulses being compressed are incident. An arrangement is provided for measuring the carrier-envelope phase of the pulses and adjusting the incidence angle of pulses on the grating cooperative with the measurement such that the carrier envelope phase of the pulses in the sequence is about constant. | 01-27-2011 |
| 20100322270 | INTRACAVITY FREQUENCY-CONVERTED OPTICALLY-PUMPED SEMICONDUCTOR LASER WITH RED-LIGHT OUTPUT - 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 between about 900 nm and about 1100 nm. | 12-23-2010 |
| 20100321765 | INTRACAVITY FREQUENCY-CONVERTED OPTICALLY-PUMPED SEMICONDUCTOR OPTICAL PARAMETRIC OSCILLATOR - 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 between about 900 nm and about 1100 nm. | 12-23-2010 |
| 20100316084 | ARRANGEMENT FOR RF POWER DELIVERY TO A GAS DISCHARGE LASER WITH CASCADED TRANSMISSION LINE SECTIONS - RF power is transmitted to a CO | 12-16-2010 |
| 20100309945 | BANDWIDTH-LIMITED AND LONG PULSE MASTER OSCILLATOR POWER OSCILLATOR LASER SYSTEMS - 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 power oscillator is relatively broad compared to that of the output of the master oscillator, but narrower than would be the case without the bandwidth limiting arrangements. The bandwidth narrowing arrangements of the power oscillator function primarily to restrict the bandwidth of amplified spontaneous emission generated by the power oscillator. | 12-09-2010 |
| 20100278204 | EDGE-EMITTING SEMICONDUCTOR LASER WITH PHOTONIC-BANDGAP STRUCTURE FORMED BY INTERMIXING - 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 lasing of high order modes. This limits the slow axis divergence of a beam emitted by the laser. | 11-04-2010 |
| 20100278200 | EXTERNAL FREQUENCY-QUADRUPED 1064 NM MODE-LOCKED LASER - The output of a mode-locked solid-state NIR laser having a pulse duration less than 50 picoseconds at a pulse-repetition frequency is frequency doubled in a nonlinear crystal to provide green radiation. The green radiation is type-I frequency doubled in a BBO crystal to provide UV radiation. The green radiation is focused into an elliptical spot in the BBO crystal with the major axis of the spot in the walk-off plane of the crystal. The length of the crystal is chosen to be much less than the Rayleigh range of the green radiation in the walk-off plane of the BBO crystal. | 11-04-2010 |
| 20100260210 | OPS-LASER PUMPED FIBER-LASER - An optical gain-fiber of a fiber-laser or a fiber-amplifier is optically pumped by radiation from a plurality of external cavity, optically pumped, surface-emitting semiconductor lasers (OPS-lasers). In one example, radiation from the OPS-lasers is focused by a lens into cladding of the gain-fiber at one end of the fiber. In another example radiation from the diode-lasers is focused into the core of a delivery fiber at one end of the delivery fiber. The other end of the delivery fiber is coupled to the cladding of the gain-fiber. | 10-14-2010 |
| 20100246616 | CAVITY-DUMPED PULSED SOLID-STATE LASER WITH VARIABLE PULSE-DURATION - 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 Pockels cell falls in a predetermined time. Varying the voltage fall-time varies the duration of pulses provided by the laser, independent of the pulse-repetition frequency. | 09-30-2010 |
| 20100239748 | ELECTRODES FOR GENERATING A STABLE DISCHARGE IN GAS LASER SYSTEMS - 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 portion being positioned on either side of the surface portion and being exposed to the gas mixture, and a coating layer made of electrically insulating material, wherein the coating layer is attached to the shoulder portion by a cold spraying method. | 09-23-2010 |
| 20100183039 | TWO-DIMENSIONAL DIODE-LASER ARRAY WITH BROAD-BAND OUTPUT - 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 the aggregate output spectrum of the stack. By selecting particular nominal emitting wavelengths of the diode-laser bars for specific positions in the stack, the aggregate emission-spectrum can be tailored to a desired shape for one or more sets of operating parameters of the stack. | 07-22-2010 |
| 20100172386 | PARTICLE DAMAGE PROTECTION FOR HIGH POWER CO2 SLAB LASER MIRRORS | 07-08-2010 |
| 20100172042 | COMPENSATION FOR TRANSIENT HEATING OF LASER MIRRORS - A mirror assembly for a carbon dioxide (CO | 07-08-2010 |
| 20100118901 | HERMETICALLY-SEALED RF FEED-THROUGH WITH INTEGRATED CAPACITOR - A carbon-dioxide (CO | 05-13-2010 |
| 20100103974 | THERMAL DISTORTION COMPENSATION FOR LASER MIRRORS - 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 the reflecting portion. The mirror is formed from copper. A pair of stainless steel strips are connected to planar portions. The bimetallic effect between the copper mirror and the stainless steel strips operates to counteract the warping of the mirror due to differential heating effects which arise during operation. In an alternate embodiment, a pair of aluminum strips are mounted on the rear surface of the mirror. | 04-29-2010 |
| 20100102043 | LASER ENGRAVING APPARATUS - In laser engraving apparatus for engraving a gray-scale image on a plastic ID-card, the laser is a modulatable optically pumped semiconductor laser. Focusing optics focus a beam from the laser into a focal spot about 10 micrometers in diameter. The ID-card is mounted on a turntable which is rotated such that the focal spot sweeps over the ID card. The turntable is translated in a direction transverse to the rotation direction and the laser is modulated such that the engraved gray-scale image is formed by a matrix of parallel black lines of various length and spacing. | 04-29-2010 |
| 20100078857 | DIODE-LASER MARKER WITH ONE-AXIS SCANNING MIRROR MOUNTED ON A TRANSLATABLE CARRIAGE - 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 carriage. The focusing lens is arranged to focus the beam to a focal-spot on the tape. As the carriage is translated, the focal-spot is swept reciprocally in a wave-like path across the tape. Modulation of the beam is arranged such that pixels of a plurality of rows of the bitmap image are printed in one traverse of the carriage. The tape is advanced incrementally and repeated traverses of the carriage are made to complete printing of the bitmap image. Light from the laser can be delivered to the oscillating mirror via an optical fiber. | 04-01-2010 |
| 20100019849 | RF PRE-AMPLIFIERS AND POWER AMPLIFIERS - 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 frequency choke and the inductor of the impedance matching network. | 01-28-2010 |
| 20090296764 | FREQUENCY-AGILE RF-POWER EXCITATION FOR DRIVING DIFFUSION-COOLED SEALED-OFF, RF-EXCITED GAS LASERS - 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 power delivering circuitry of the laser includes an arrangement for determining and recording the two resonant frequencies. RF power is applied to the electrodes at the first recorded resonant frequency to facilitate lighting of the discharge, and thereafter at the second resonant frequency to light and sustain the discharge. | 12-03-2009 |
| 20090065697 | Sub-millimeter wave frequency heterodyne detector system - The present invention relates to sub-millimeter wave frequency heterodyne imaging systems. More specifically, the present invention relates to a sub-millimeter wave frequency heterodyne detector system for imaging the magnitude and phase of transmitted power through or reflected power off of mechanically scanned samples at sub-millimeter wave frequencies. | 03-12-2009 |
