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7620081 |
Semiconductor laser utilizing real-time linewidth reduction method
A system for real-time linewidth reduction in an optical source includes a laser device comprising a back facet, wherein the laser device receives a modulated input current and generates an optical...
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7613216 |
Laser frequency stabilizing apparatus, method and computer program product for stabilizing laser frequency
A laser frequency stabilizing apparatus stabilizes an oscillation frequency of laser light by varying a resonator length on the basis of a saturated absorption line included in an optical output...
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7602825 |
Tunable passively mode-locked lasers with phase-lock feedback for low timing jitters
Techniques and devices to stabilize a passively mode-locked laser against the timing jitter by using a feedback control signal based on a signal component at a high harmonic frequency of the laser...
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7596156 |
Laser
A method of stabilising a laser in order to maintain the laser in SLM operation is disclosed. The resonator cavity of the laser is modulated by a modulation signal applied to a piezo-electric...
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7586961 |
Laser systems
A laser system 1 comprises six solid state diode laser modules 37.1 to 37.6 whose output beams are directly coupled into beam steering devices 38.1 to 38.6 and thereby routed to laser...
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7583712 |
Optoelectronic device and method of making same
A light emitting device is disclosed that emits light from the surface in a broad spectral range and in a broad range of angles tilted with respect to the direction normal to the exit surface. An...
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7564881 |
Optical transmission module with digital adjustment and the adjusting method
The invention discloses an optical transmission module with digital adjustment and method thereof. The module includes a laser ( 21 ), a laser driver ( 22 ), an automatic power adjustment circuit (...
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7548570 |
Laser power control apparatus
In a laser power control apparatus for controlling a laser power of a combination drive, first laser light Lc applied onto a first optical disk and second laser light Ld applied onto a second...
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7535939 |
Optical power control apparatus, optical beam scanning apparatus, image forming apparatus, and optical power control method
An optical power control apparatus includes a changing unit which changes, a plurality of number of times, the value of a current flowing to an optical beam output apparatus, and an obtaining unit...
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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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7505494 |
System and method for controlling wavelength of a laser beam
A system of controlling a wavelength of a laser beam is provided. The system comprises a stage for supporting a wafer, an optical convergence unit for emitting the laser beam moving in an optical...
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7502567 |
Electroabsorption-modulated Fabry-Perot laser and methods of making the same
Electroabsorption-modulated Fabry-Perot lasers and methods of making the same are described. In one aspect, a light source includes a Fabry-Perot (FP) laser that is operable to generate multimode...
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7496120 |
Compact laser output monitoring using reflection and diffraction
Compactness is preserved while enabling beam monitoring of optical properties of an output beam by employing a combination of reflection and diffraction. An input beam is reflected, divided using...
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7496119 |
External cavity laser with multiple stabilized modes
A laser apparatus for providing a stabilized multi mode laser beam includes an external cavity for providing an optical path for generating a laser beam which is stimulated by a gain medium, where...
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7492795 |
Ultralow noise mode-locked laser and RF sinewave source
Systems, devices and methods of generating both a precision electrical timing signal as well as a precision optical timing signal. A novel, modified opto-electronic loop oscillator is used to drive...
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7492796 |
Method and apparatus for automatically controlling a power of a laser diode
A method and apparatus to automatically control an output power of a laser diode, include generating an error voltage between an output voltage of the laser diode sampled during an automatic power...
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7486708 |
Method and system for stabilizing operation of laser sources
A system for stabilizing an output optical power from a laser source against drifts induced by temperature and/or aging, said output optical power including a target optical-modulation amplitude...
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7483455 |
Control method and control circuit for laser diode, and optical transmitter using the same
A control method for a laser diode is conducted such that optical output and OMA (optical modulation amplitude) or extinction ratio of the laser diode are controlled while modulating the optical...
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7480074 |
Image forming method and apparatus and optical head
An image forming apparatus illuminates a pixel formation member with optical energy according to image data specifying a value for each pixel in the image. Some of the optical energy emitted to...
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7467897 |
Light transmitting modules with optical power monitoring
An optical module, such as a package for a vertical cavity surface emitting laser diode (VCSEL) or other light emitting device, includes monitoring of the emitted optical power by tapping the...
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7466730 |
Femtosecond laser device having output stabilizing mechanism
A femtosecond laser with stabilized output, and a method for stabilizing the output of a femtosecond laser. The femtosecond laser comprises a regenerative amplifier, a photodetector, a control...
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7466729 |
Wavelength monitor for use with more than one wavelength
A wavelength locker for use at more than one wavelength includes filters with different characteristics for a corresponding detector. The filters may be etalons having different free spectral...
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7460572 |
Optical module and method for monitoring and controlling wavelengths
The present invention provides wavelength monitoring and/or control enabling size reduction and low power operation without requiring a complicated optical system in its wavelength monitoring and...
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7443896 |
Optical midpoint power control and extinction ratio control of a semiconductor laser
The present invention provides a method and apparatus, such as an integrated circuit, to control the optical midpoint power level and the extinction ratio of a semiconductor laser and maintain the...
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7428254 |
Athermalisation of tuneable lasers
This invention describes a technique and apparatus to use any tuneable laser to generate a specified output frequency without controlling its temperature. This technique only involves a thermal...
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7426227 |
Semiconductor laser device, optical disk apparatus and optical integrated unit
A semiconductor laser device includes: a first cladding layer, which is made of a nitride semiconductor of a first conductivity type and is formed over a substrate; an active layer, which is made...
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7418017 |
Interferometer, in particular for determining and stabilizing the relative phase of short pulses
A description is given of an optical structure ( 100 ), in particular for determining and stabilizing the relative phase of short pulses, which contains a broadening device ( 6 ) for broadening the...
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7418018 |
Driver circuit for semiconductor laser diode
The present invention provides an LD driver able to stably control the output power and the extinction ratio of the optical signal without regarding the coupling mode, the AC mode or the DC mode,...
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7388891 |
Wide bandwidth light source
PROBLEM TO BE SOLVED: to realize a wide bandwidth light source capable of a stable operation providing a less spectrum variation. SOLUTION: Optical pulses 202 outputted by this optical...
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7386020 |
Systems, devices and methods for temperature-based control of laser performance
This disclosure concerns systems, methods and devices for temperature-based control of laser performance. One example of a method is performed in connection with a laser of an optoelectronic...
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7372879 |
Wavelength locker using modulator current and photodetector
The wavelength of light emitted by a laser and modulated by a frequency response modulator is determined from the power of the emitted light and the current drawn by the modulator. From the...
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7369587 |
Temperature control for coarse wavelength division multiplexing systems
Optoelectronic devices and methods are used to maintain a CWDM transmitter operating within design parameters over an extended ambient temperature range. In order to avoid excessive wavelength...
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7369586 |
Laser module
In a laser module comprising a hermetically sealed container having inside a semiconductor laser device whose emission wavelength is 350˜450 nm, generation of organic volatile gas is suppressed in...
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7362782 |
Optical semiconductor device and controlling method of the same
An optical semiconductor device includes a wavelength-tunable semiconductor laser chip, a mount carrier, a first temperature sensor and a wire. The wavelength-tunable semiconductor laser chip has a...
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7359412 |
Laser apparatus, laser irradiation method, and manufacturing method of semiconductor device
It is an object to provide a laser apparatus, a laser irradiating method and a manufacturing method of a semiconductor device that make laser energy more stable. To attain the object, a part of...
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7356056 |
Coherent light source and control method thereof, and display unit and laser display using them
In a display device that displays a video by scanning coherent light across a screen, modulation at high speeds and gradation are necessary for a coherent light source. An oscillation wavelength...
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7356055 |
Method and device for regulating the average wavelength of a laser, especially a semiconductor laser
The invention relates to a method for regulating the average wavelength of a laser, especially a semiconductor laser, comprising a wavelength-selective, at least partially reflecting optical...
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7346086 |
Apparatus for monitoring the operating status of a laser
The present invention provides an apparatus for monitoring a laser. The apparatus includes a plurality of sensors and a monitoring device capable of communicating with the plurality of sensors and...
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7333521 |
Method of sensing VCSEL light output power by monitoring electrical characteristics of the VCSEL
Output power of light emitted from a data transmission light source is determined based upon forward voltage, forward current, ambient temperature and a factor specific to the manner in which the...
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7295585 |
Method for noise cancellation by spectral flattening of laser output in a multi-line-laser instrument
An improved method of subtracting laser amplitude fluctuations from a desired signal in a multi-line laser system and a detection system having improved noise cancellation are provided. This...
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7292116 |
Temperature stabilizer and oscillating apparatus
A temperature stabilizer for accurately stabilizing the temperature of an object is provided. The temperature stabilizer stabilizes the temperature of an object to a reference temperature. The...
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7289544 |
Optical module
The object of the present invention is to provide an optical module for the WDM communication system, in which the oscillation wavelength is on the grid of the WDM regulation, moreover the optical...
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7286588 |
Semiconductor laser with grating structure for stabilizing the wavelength of optical radiation
An optoelectronic device having a semiconductor laser diode and a grating structure for stabilizing the optical wavelength of optical radiation generated by the laser diode.
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7283571 |
Method and system for performing wavelength locking of an optical transmission source
A system for locking the operating wavelength of an optical transmission source, the system including: a pattern of nanostructures being optically coupled to the optical transmission source and...
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7269190 |
Er-doped superfluorescent fiber source with enhanced mean wavelength stability
An erbium-doped (Er-doped) superfluorescent fiber source (SFS) has an enhanced mean wavelength stability. A method determines an estimated mean wavelength of a SFS. The method includes providing an...
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7266308 |
Light output control circuit
Using a switching signal from a coarse/fine switching and operation mode switching circuit, the width of change of a counter control value during power up is increased, and the width of change is...
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7254148 |
Laser light generating device and method of fabricating the same
In a laser light generating device, the stability against vibration and time-dependent changes will be improved, and influences of temperature changes exerted on the resonator will be reduced. In a...
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7244923 |
Surface emitting laser device including optical sensor and optical waveguide device employing the same
Provided are a surface emitting laser device having an optical sensor, and an optical waveguide device employing the same. The surface emitting laser device having an optical sensor includes a...
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7242701 |
Laser wavelength control arrangement and method
Wavelength control and stabilization of a laser is achieved by a practical, inexpensive, and accurate technique adapted for most optical transmission system applications by a method involving a...
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7233608 |
Frequency-stabilized laser source adapted for use as a frequency standard, in particular in the field of telecommunications
A frequency-stabilized laser source that is adapted for use as a frequency standard. The frequency of the laser source is locked and the laser beam delivered by the laser source on a transition of...
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