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7633977 |
Multispectral laser with improved time division multiplexing
A laser provides a cavity with complementary wavelength-dependent delay elements to provide the same optical length but time-staggered light paths for different colors. This provides the ability to...
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7626758 |
Method and apparatus for controlling and protecting pulsed high power fiber amplifier systems
An electronic circuit for controlling a laser system consisting of a pulse source and high power fiber amplifier is disclosed. The circuit is used to control the gain of the high power fiber...
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7623556 |
Device for multiplying optical frequencies
An optical cavity is combined with non-linear optical crystals and a laser source to generate light radiation at a frequency about 1.5 times the frequency of the initial laser source while having a...
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7586960 |
Forced wavelength chirping in semiconductor lasers
Methods of controlling semiconductor lasers are provided where, the time-averaged optical spectrum of the semiconductor laser is broadened by modulating the drive current at a relatively high...
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7580183 |
Light generator, optical amplifier, and optical communication system
In an optical amplifier according to the present invention, a change signal from a change signal source is fed into a light source or a drive circuit. The wavelength of light outputted from the...
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7545838 |
Incoherent combination of laser beams
A method of combining beams from a plurality of laser resonators includes frequency modulating the output of each of the lasers with one or more of the lasers frequency modulated out-of-phase with...
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7542490 |
Reduction of surface heating effects in nonlinear crystals for high power frequency conversion of laser light
A device for generating a frequency converted laser beam includes a nonlinear crystal having a first end face and a second end face opposed to the first end face. The nonlinear crystal is...
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7529280 |
Tunable laser apparatus and methods
A tunable laser has a first optical element spaced apart from a second optical element to form a laser cavity of fixed length there between. An optical gain medium is in at least part of the laser...
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7508849 |
Wavelength tunable laser device
A semiconductor optical amplifier, an acousto-optic tunable filter, a phase shifter, a lens, and an internal etalon are arranged in a resonator. Outside the resonator, two lenses, two beam...
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7477667 |
Practical approach for one mJ femtosecond fiber laser
A fiber Chirped Pulse Amplification (CPA) laser system includes a fiber mode-locking oscillator for generating a laser and stretching into a few hundreds ps-10 ns pulse by a fiber stretcher for...
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7436864 |
Method for optimising the calibration process of a tuneable laser
A method relating to the calibration of tuneable lasers is described. The method provides for the provision of correct control currents so as to achieve each of desired output frequencies from the...
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7418205 |
Method and apparatus for controlling a frequency hopping laser
An optical spread spectrum communication system includes a tunable laser which sequentially outputs optical signals having different wavelengths. The laser produces a frequency spectrum having a...
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7414779 |
Mode locking methods and apparatus
In one aspect the invention relates to a frequency varying wave generator. The generator includes a gain element adapted to amplify a wave having a wavelength; a time varying tunable wavelength...
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7391796 |
Ultra-low heat laser
An ultra-low heat laser that does not rely on florescence cooling. Generally, the inventive laser includes a pump source operable at a pump frequency and a gain medium disposed to receive energy...
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7389053 |
Tunable filtering of RF or microwave signals based on optical filtering in Mach-Zehnder configuration
Devices and techniques for achieving signal filtering in RF or microwave frequencies by optical filtering using two separate optical paths. Each optical path may include one or more optical...
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7389045 |
Apparatus and method for monitoring and compensating an optical signal
Optical communication apparatuses and optical communication methods are provided. According to one aspect, an optical communication apparatus includes a communication path configured to communicate...
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7379672 |
Photonic RF distribution system
The present photonic RF generation and distribution system provides a system and method for distributing an RF output signal. The photonic RF distribution system includes two optical sources for...
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7362783 |
Optical frequency mixing
A method of generating coherent radiation, wherein a first fundamental beam of radiation from a four level laser and a second fundamental beam of radiation from a three level laser are mixed in a...
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7354157 |
Image display device and light source device
An image display device includes a laser light source, a wavelength conversion element converting a wavelength of a light beam emitted from the laser light source into a predetermined wavelength,...
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7327769 |
Injection locking Q-switched and Q-switched cavity dumped CO2 lasers for extreme UV generation
A CO 2 laser reference oscillator (RO) can provide injection seeding to a Q-switched (QS) or Q-switched cavity dumped (QSCD) CO 2 laser, where the output frequency of the RO laser is locked to...
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7324567 |
Modulation frequency tunable optical oscillator
Provided is a millimeter-wave band frequency optical oscillator that can be used as an oscillation frequency signal source for a millimeter-wave forwarded to wireless subscribers from a base...
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7324761 |
Single sideband optical transmitter
Described are an optical transmitter and a method for generating a single sideband optical signal. The method includes generating a data signal at a first power level and at a second power level...
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7301972 |
Apparatus, system, and method for frequency stabilized mode-locked laser
A high finesse optical resonator is used to store optical pulses of a mode-locked laser. The mode-locked laser is frequency stabilized by monitoring an optical attribute of the high finesse optical...
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7295582 |
Thermo-optic tunable laser apparatus
Thermo-optic tuning apparatuses and techniques that may be used in external cavity lasers are provided. A wavelength selection device may be placed in the external cavity and may include a...
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7295589 |
Frequency modulated vertical cavity laser
A frequency modulated (FM) vertical cavity surface emitting laser (VCSEL). The frequency modulated VCSEL includes a mirror region that has an active region. The frequency modulated VCSEL also...
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7295584 |
System and method for generating multi-wavelength laser source using highly nonlinear fiber
A number of embodiments provide multi-Wavelength Laser Source (MWLS) designs based on Super Continuum (SC) generation using Highly Non-Linear optical Fiber (HNLF). Advantageously, in some...
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7274718 |
Electronic alignment of acousto-optic modulator for modulating a laser
A method and apparatus are provided to modulate a beam of laser light. An acousto-optic modulator (AOM) is positioned to receive continuous-wave (CW) laser light at an angle approximating the Bragg...
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7209499 |
Mode-selective frequency tuning system
A frequency tuning system for a laser includes mode-matched lasing and feedback cavities. A reflective facet of the feedback cavity is adjustable for retroreflecting different feedback frequencies...
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7209502 |
Open loop laser power control for optical navigation devices and optical systems
A current output of a drive signal, modulated between two current settings, is applied to a laser diode, e.g. VCSEL. The settings are selected such that laser diode's power output meets the average...
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7177331 |
Laser diode module with a built-in high-frequency modulation IC
A laser diode module with a built-in high-frequency modulation IC used to remove the reflected noise generated as the laser beam reads the signal to be played back and directly packaged within a...
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7167493 |
Method for automatically revising wavelength of electro-absorption modulator integrated laser diode
The present invention relates to a method for revising a wavelength of the EML by controlling a working temperature based on arithmetic functional relations between the DC-Offset voltage and the...
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7142570 |
Apparatus and method for generating optical carrier for microwave and millimeterwave photonics system
An apparatus and a method for generating an optical carrier is disclosed. The apparatus includes: a light source generating a pump light; a SBS generator for stimulated Brillouin scattering the...
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7106974 |
Low-cost WDM source with an incoherent light injected fabry-perot laser diode
The present invention discloses a low-cost light source for optical transmission systems and optical networks based on wavelength-division multiplexing (WDM) technology. A light source in...
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7106494 |
Controlling resonant cells of a composite material
An apparatus for controlling propagation of incident electromagnetic radiation is described, comprising a composite material having electromagnetically reactive cells of small dimension relative to...
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7088749 |
Green welding laser
A harmonic system for use with metals and alloys such as titanium, steel, copper, gold, aluminum, etc. is disclosed. The harmonic laser system includes an oscillator cavity having a first end...
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7054342 |
High density optical source bank
An optical test system for use in testing fiber optical transmission systems and components comprises a modular construction in a single housing. The modular construction includes a plurality of...
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7006676 |
Method and apparatus for detecting an abnormality within a host medium utilizing frequency-swept modulation diffusion tomography
Methods and apparatus are provided for detecting an abnormality in a host medium, such as a tumor within a patient's breast. The host medium is initially illuminated at a plurality of different...
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6999481 |
Method and device for reducing the pump light in a sheat-pumped fiber laser output
A pump fiber is stripped of its cladding over the last section. This can occur by etching a coating off. The sheath is preferably etched off wedge-shaped. As a result thereof, the remaining pump...
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6996144 |
Wavelength stabilization of tunable lasers by current modulation
Apparatus and method for stabilizing the wavelength of a tunable laser to a target wavelength, by correspondingly adjusting the electrooptical performance of the laser's gain medium, whereby to...
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6980353 |
Frequency synthesiser
A frequency synthesiser for generating wideband signals for zero Hz up to frequencies in the millimetre wave band provides the ability for arbitrarily fine increments in output frequency. The...
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6956878 |
Method and apparatus for reducing laser speckle using polarization averaging
A method and apparatus for reducing speckle uses polarization averaging. A polarizing beam splitter divides a first polarized laser output into a second polarized laser output and a third polarized...
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6954473 |
Optoelectronic device employing at least one semiconductor heterojunction thyristor for producing variable electrical/optical delay
An optoelectronic integrated circuit includes a resonant cavity formed on a substrate. A heterojunction thyristor device is formed in the resonant cavity and operates to detect an input optical...
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6917633 |
Frequency tunable optical oscillator with fiber grating mirrors
There is provided a millimeter wave band frequency optical oscillator predicted to be used as a millimeter wave oscillating frequency signal source in a base station of a millimeter wave wireless...
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6912239 |
Distributed feedback laser device
A distributed feedback laser device inhibiting beam coupling coefficient variation resulting from fabrication dispersion and improving fabrication yield. The distributed feedback laser device...
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6898217 |
Ultrasonic tunable laser
A tunable laser device produces a laser energy over a range of frequencies. A property of an ultrasonic transducer or, more specifically, the frequency of an ultrasonic wave created by the...
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6891149 |
Optical phase detector
An optical phase detector comprising coupling means for receiving two optical inputs and for producing two combined optical outputs, means for detecting the two combined optical outputs and...
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6885462 |
Wavelength monitoring device and method of tunable laser sources
There are disclosed a wavelength monitoring device of tunable laser sources and a method thereof. A Fabry-Perot etalon is provided to detect the wavelength drift, and furthermore, a Fabry-Perot...
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6870865 |
Laser oscillation apparatus, exposure apparatus, semiconductor device manufacturing method, semiconductor manufacturing factory, and exposure apparatus maintenance method
A laser oscillation apparatus includes a wavelength change unit for driving a wavelength selection element in a band-narrowing module and changing the oscillation wavelength of a laser beam to a...
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6868099 |
Frequency-narrowed high power diode laser system with external cavity
A high power diode laser system utilizes an external cavity to narrow the spectral width of a high power multimode diode laser to change the output power normally produced by the diode from a broad...
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6868102 |
CS-RZ optical clock signal generator, and a resynchronized optical multiplexer containing such a generator
The present invention provides a generator of a CS-RZ optical clock signal at a predetermined clock frequency. The generator contains a first laser source and a second laser source which...
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