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| Number | Title | Issue Date |
| 7675951 | Threshold voltage difference allowable semiconductor laser driving apparatus A semiconductor laser driving apparatus controls a semiconductor laser to output a prescribed intensity of laser light. The semiconductor laser driving apparatus includes at least two semiconductor laser driving circuits each outputting a prescribed amount of curren... | 03/09/2010 |
| 7372882 | Driving circuit for and semiconductor device for driving laser diode A driving circuit supplies a suppression current (I4) which reduces a decrease in a driving current (Idrive) immediately after occurrence of an overshoot at the time of the rise of the driving current (Idrive) to a laser diode (1). The driving circuit ... | 05/13/2008 |
| 7352784 | Laser burst boosting method and apparatus Methods and apparatus for managing thermal loads on a laser gain medium and for boosting the output power of a diode pumped laser are disclosed. The short-term average pumping power to the gain medium is increased, to provide a burst of pumping energy to the laser g... | 04/01/2008 |
| 7235954 | Load driving device and portable apparatus utilizing such driving device A load such as an LED and a constant-current source are connected in series with each other between the node of a dc-dc conversion type power supply circuit providing an output voltage and the ground. The constant-current source provides a constant current Io, the m... | 06/26/2007 |
| 7224380 | Light-emitting device driver and image forming apparatus A light-emitting device driver that includes a driver unit that drives a light-emitting device, a compensator that compensates for at least one of the rising and falling responses of the driver unit, a switching unit that switches on and off the compensator, and a c... | 05/29/2007 |
| 7215688 | Disable/enable control for laser driver eye safety A circuit for disabling an energy-generating component. The circuit comprises an input operable to receive a disable signal and a disable circuit operable to disable the component in response to the disable signal for a predetermined duration of time sufficient to m... | 05/08/2007 |
| 7180921 | Method and apparatus for driving laser diode sources A method and apparatus for driving a laser diode source, such as a laser diode or a laser diode array. The driver controlling current in response to a signal indicative of excessive current or current density. The signal may be derived from the drive current, the vo... | 02/20/2007 |
| 7136405 | Laser beam irradiation device A laser beam irradiation device is equipped with a very strict safety arrangement, thereby assuring that a user can use it safely. A hand-held applicator has a face formed on its top, and a push button switch on its side. The face has a spherical lens press-fitted i... | 11/14/2006 |
| 7120180 | Laser diode driving circuit and an optical head A laser diode driving circuit includes two chip capacitors disposed in the vicinity of one side portion of an IC along which a high voltage power supply terminal, a low voltage power supply terminal and a driving signal output terminal are disposed. One end portion ... | 10/10/2006 |
| 7085302 | Laser apparatus, exposure apparatus and method There is to provide a laser apparatus that emits a laser beam by exciting gas enclosed in a chamber, including a gas characteristic detecting mechanism for detecting a characteristic of the gas in the chamber, and a calculation mechanism for calculating an oscillati... | 08/01/2006 |
| 7072375 | Line-narrowed gas laser system In a line-narrowed gas laser system such as a line-narrowed molecular fluorine laser system, ASE is cut off to obtain a spectral linewidth of 0.2 pm or lower and a spectral purity of 0.5 pm or lower. The laser system comprises a laser chamber filled with an F2 | 07/04/2006 |
| 7072370 | Arrangement for generating pulsed currents with a high repetition rate and high current strength for gas discharge pumped radiation sources The invention is directed to an arrangement for generating pulsed currents for gas discharge pumped radiation sources, particularly with high repetition rates and high current strengths for generating plasma emitting EUV radiation. The object of the invention, to fi... | 07/04/2006 |
| 7068693 | Laser driver circuit for burst mode transmission A laser driver circuit for burst mode transmission is equipped in a transmitter at a client side within a P2MP (Point to Multipoint) optical network. The laser driver circuit utilizes a laser driver chip for a continuous mode. The selected laser driver chip is capab... | 06/27/2006 |
| 7058093 | Q-switched, cavity dumped laser systems for material processing This disclosure discusses techniques for obtaining wavelength selected simultaneously super pulsed Q-switched and cavity dumped laser pulses utilizing high optical damage threshold electro-optic modulators, maintaining a zero DC voltage bias on the CdTe electro-opti... | 06/06/2006 |
| 7046706 | Laser diode driving device A laser diode driving device of the present invention can appropriately shorten the rising time and the falling time of a laser diode drive current in a range from a small current region to a large current region. In synchronization with the addition of an original ... | 05/16/2006 |
| 7046612 | Drive current supply circuit with current mirror A drive current supply circuit is provided in which the speed of rise of the drive current to a laser diode is increased. In a drive current supply circuit for supplying drive current I to load 50 connected with the line 1R of two parallel lines 1 | 05/16/2006 |
| 7039079 | Pulsed COlaser including an optical damage resistant electro-optical switching arrangement A laser includes a gain medium located in a laser resonator. The gain medium generates plane polarized radiation plane polarized in a first polarization orientation. An electro-optical switch is located in the resonator. When the switch is activated the polarization... | 05/02/2006 |
| 7031357 | High speed switching driver The present invention is generally directed towards a system and method for providing a high speed switching driver to transmit data information. A first current is switched through a diode or shunted through an alternate path to selectively bias the diode. A second... | 04/18/2006 |
| 7024864 | Bipolar current source based on a unipolar power supply An adjustable bipolar current source for a load, such as a thermoelectric cooler, includes a voltage-controlled power supply having a unipolar output, and an H-bridge. At least one of the two active elements on a first side and at least one of the two active element... | 04/11/2006 |
| 7020170 | Operational amplifier for optical transceiver An optoelectronic transceiver is provided that includes a laser driver in communication with an optical transmitter. The laser driver includes an operational amplifier having three stages and connected with an optical transmitter. The first stage includes a differen... | 03/28/2006 |
| 6993052 | System and method for delay compensation for a pulsed laser Method and system provide a variable delay between the external trigger pulse for a laser system and the light pulse such that the total delay is controlled. The method and system utilize a digital time measuring circuit which measure a time interval which correspon... | 01/31/2006 |
| 6989807 | LED driving device A LED driving device includes a plurality of LEDs, a voltage detecting circuit, and a current switching circuit. When the voltage detecting circuit detects the different voltage level of power source without coupling to a filtering capacitor, it sends a signal to th... | 01/24/2006 |
| 6980575 | Topology on VCSEL driver The present invention provides a circuit capable of driving a diode with multiple amounts of current with a low supply voltage without the requirement of alternating current coupling. The circuit provides for headroom voltage for the current sources allowing them to... | 12/27/2005 |
| 6969845 | System and processes for causing the simultaneity of events including controlling a pulse repetition frequency of a pulsed laser for disabling a scanning imaging system A system and processes for causing the simultaneity of events from two or more families of events are described. A repetition rate and modulus of each one the first families of events is determined. A second family of events has a controlled repetition rate that opt... | 11/29/2005 |
| 6970487 | Semiconductor laser driving circuit and optical head A semiconductor laser driving circuit comprises a driving IC and a substrate on which the IC is mounted. The IC incorporates: a switching element for generating a driving signal; a high-potential power terminal and a low-potential power terminal for feeding supply v... | 11/29/2005 |
| 6956880 | Semiconductor laser module A semiconductor laser module comprises a laser diode that emits light in a frontward direction and a rearward direction, an optical fiber that transmits the light emitted in the frontward direction by the laser diode, and a monitor photodiode that receives the light... | 10/18/2005 |
| 6950453 | Pulser driven, helium free transversely excited atmospheric-pressure (TEA) CO2 laser A novel and inexpensive excitation circuit based on a single switch and a single source drives helium-free TEA CO2 lasers, mini to conventional types, providing low divergent output. By varying the partial pressure of either CO2 or N2 | 09/27/2005 |
| 6922278 | Switched laser array modulation with integral electroabsorption modulator A photonic device including an array of lasers providing light to an array of electro-absorption modulators, both on a common substrate. In some embodiments the lasers are in a closely spaced array and lase at different wavelengths, providing with associated electro... | 07/26/2005 |
| 6920163 | Semiconductor laser driving circuit and semiconductor laser driving method therefor A semiconductor laser driving circuit drives a plurality of semiconductor laser devices having different objective operating voltages, and has a power source for generating power voltages for the semiconductor laser devices, a power voltage changeover means for chan... | 07/19/2005 |
| 6907055 | Method and circuit for measuring the optical modulation amplitude (OMA) in the operating region of a laser diode A method and circuit for measuring the optical modulation amplitude in the operating region of a laser diode is described. The method utilises two measurements of OMA, each measurement being related to the slope in a specific portion of the operating region of the p... | 06/14/2005 |
| 6862307 | Electrical excitation circuit for a pulsed gas laser Method and system for providing an excimer or molecular fluorine laser including a laser tube filled with a laser gas surrounded by an optical resonator, where the laser tube has multiple electrodes including a pair of main discharge electrodes connected to a discha... | 03/01/2005 |
| 6853658 | Optical logical circuits based on lasing semiconductor optical amplifiers Optical logic circuits are based on lazing semiconductor optical amplifiers, such as vertical lazing semiconductor optical amplifiers. For example, one or more VLSOAs with selected depletion thresholds are combined to form various optical logic devices. ... | 02/08/2005 |
| 6847670 | Gas laser apparatus emitting ultraviolet radiation The oscillation pulse width is extended in a gas laser apparatus emitting ultraviolet radiation by a high-repetition rate oscillating operation. The gas laser apparatus has a pair of laser discharge electrodes connected to the output terminals of a magnetic pulse co... | 01/25/2005 |
| 6826215 | Laser diode driving circuit A laser diode driving circuit is provided, which is capable of supplying a laser diode thereof with a high-speed pulse current. A current source supplies a current to the laser diode. An NMOS transistor as a first switch is connected between the current source and t... | 11/30/2004 |
| 6801557 | Laser driver for a laser sensing system A laser driver for laser sensing system having two lasers on a single PCB, thermo-electric temperature control, rapid activation, and pulse power and duration safety tables embedded in the microprocessor controller. ... | 10/05/2004 |
| 6798803 | Gas laser device In a gas laser device, a compensation time according to electric charges accumulated in a charging capacitor is calculated and, when the compensation time lapsed from a time when an outer trigger was input, a compensation trigger is output to a semiconductor switch ... | 09/28/2004 |
| 6775018 | Safety device A safety device for a printer has a first switch and a second switch that separately determines whether a door of the printer is open or closed. When the door is open (in the state that causes danger), the safety device stops driving systems of the printer with soft... | 08/10/2004 |
| 6771678 | Laser system and method of operation having improved signal continuity and safety An improved laser system and method of operation provides signal continuity and safety in the event of accidental interruption of the laser beam. At the transmitting end, a main laser generates a beam, which is surrounded by a low powered guard beam generated by a p... | 08/03/2004 |
| 6738401 | High speed switching driver The present invention is generally directed towards a system and method for providing a high speed switching driver to transmit data information. A first current is switched through a diode or shunted through an alternate path to selectively bias the diode. A second... | 05/18/2004 |
| 6728276 | System for controlling bias current in laser diodes with improved switching rates The present invention relates generally to laser diodes, and particularly to an operational amplifier able to switch laser diodes on and off quickly without adversely affecting data transmission by the laser diodes. A differential amplifier included in an operationa... | 04/27/2004 |
