| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 372380040 | Power supply | 15 |
| 20080291956 | Driving laser diodes with immunity to temperature changes, aging, and other effects - Various systems and methods are provided to achieve laser power control. In one embodiment, a system is provided that comprises a counter that holds a digital value. An digital-to-analog converter is employed to convert the digital value to an analog current. A data threshold current is generated by a laser driver based upon the analog current. The data threshold current is employed to represent a data value in a data signal employed to drive a laser diode. Also, circuitry is employed to adjust the digital value based upon a comparison between a target threshold current and a feedback current generated from a laser output of the laser diode. | 11-27-2008 |
| 20090168823 | SEMICONDUCTOR LASER DEVICE, OPTICAL PICKUP DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - A semiconductor laser device according to the present invention includes: at least one laser chip that emits a laser beam; a plurality of lead pins that are electrically connected to the laser chip and that supply current to get the laser beam emitted; and a stem that holds the laser chip and the lead pins thereon. The lead pins have mutually different lengths and the longest one of the lead pins is electrically connected to the stem. | 07-02-2009 |
| 20090316743 | LASER DIODE DRIVER WITH ADAPTIVE COMPLIANCE VOLTAGE - A laser diode driver with means for adjusting the compliance voltage to allow a current source to accurately reproduce a current command while simultaneously minimizing the power dissipation of the current source. For a slowly-varying or DC current command, the compliance voltage is continuously adjusted to limit the power dissipation of the current source to below a predetermined minimum. For a pulsed current waveform, the compliance voltage is maximized during periods of zero or low current demand so that sufficient energy is stored to faithfully reproduce the leading edge of a pulsed current command, and reduced during the plateau portion of a pulsed current command to minimize the power dissipation of the current source. | 12-24-2009 |
| 20100091807 | DRIVER CIRCUIT FOR LOADS SUCH AS LED, OLED OR LASER DIODES - A driver circuit | 04-15-2010 |
| 20100172384 | Circuit and method for controlling light-emitting components - In order to further develop a circuit arrangement or circuit, in particular driver circuit, and a method for controlling at least one light-emitting component, in particular at least one electro-optical transducer, for example at least one light-emitting diode (LED) or electroluminescent diode or at least one laser, such as at least one semiconductor laser, by switching at least one switching element at least between a first switching position and a second switching position, at least one further circuit component is switched to active or switched on in the second switching position, so that current drain and output resistance are as low as possible, so that the highest possible frequency or switching speed as well as the highest possible output voltage for the light-emitting component can be achieved, it is proposed that the light-emitting component is controlled by varying its operating voltage. | 07-08-2010 |
| 20100172385 | Circuit and method for controlling light-emitting components - Circuit arrangement or circuit, in particular driver circuit, and a method for controlling at least one light-emitting component, such as an electro-optical transducer, a light-emitting diode (LED), an electroluminescent diode, a laser, or a semiconductor laser, by switching a switching element between a first switching position and a second switching position, and the voltage supply is effected by a supply element, such as a voltage source or a current source supported by a decoupling capacitor on the output side, so that current drain and output resistance are as low as possible, so that the highest possible frequency or switching speed as well as the highest possible output voltage for the light-emitting component can be achieved, the light-emitting component is controlled by varying its operating voltage, in particular by switching between the switching positions, and the first and second switching positions are of low impedance for the operating frequency. | 07-08-2010 |
| 20100226399 | METHOD OF DRIVING GaN-BASED SEMICONDUCTOR LIGHT EMITTING ELEMENT, METHOD OF DRIVING GaN-BASED SEMICONDUCTOR LIGHT EMITTING ELEMENT OF IMAGE DISPLAY DEVICE, METHOD OF DRIVING PLANAR LIGHT SOURCE DEVICE, AND METHOD OF DRIVING LIGHT EMITTING DEVICE - A method of driving a GaN-based semiconductor light emitting element formed by laminating a first GaN-based compound semiconductor layer having a first conductive type, an active layer having a well layer, a second GaN-based compound semiconductor layer having a second conductive type, includes the steps of: starting light emission by the start of the injection of carrier; and then stopping the injection of the carrier before a light emission luminance value becomes constant. | 09-09-2010 |
| 20100254420 | PHOTONIC INTEGRATED CIRCUIT HAVING VARIABLE LENGTH MACH-ZEHNDER MODULATORS - A photonic integrated circuit (PIC) having multiple Mach-Zehnder (MZ) modulators with different lengths is provided. The modulator lengths are selected to provide optimal performance for each optical path provided on the PIC. | 10-07-2010 |
| 20110051764 | LASER DIODE DRIVE CIRCUIT - A laser diode drive circuit includes a power supply circuit connected to an anode of a laser diode to supply a variable voltage to the laser diode, and a drive current control circuit connected to a cathode of the laser diode to control a current of the laser diode. The power supply circuit generates a start-up voltage which is equal to the sum of the maximum drive voltage that is larger than the drive voltage and a predetermined first reference voltage, acquires a cathode voltage of the laser diode while the start-up voltage is generated, generates a voltage by lowering from the start-up voltage so as to diminish the difference between the acquired cathode voltage and the first reference voltage, and the first reference voltage is the minimum cathode voltage necessary to supply a predetermined current to the laser diode by the drive current control circuit. | 03-03-2011 |
| 20120207184 | HANDHELD DEVICE FOR TREATING ORAL ULCERS AND SORES - A device for treating oral ulcers or sores comprises a light source for illuminating a sore or ulcer to be treated; a laser diode for directing laser energy at the sore or ulcer; a regulated power supply for powering the light source and the laser diode at selected power levels; a first switch operable to selectively deliver power from the regulated power supply to the light source; a second switch operable to selectively deliver power from the regulated power supply to the laser diode when the switch is operated by a user to treat the located ulcer or sore; a control device configured to operate the laser diode for a selected time period each time the switch is operated and to then subsequently turn the laser diode off until the switch is operated again; and a portable, handheld housing for housing the laser diode, regulated power supply, switch, and control device. | 08-16-2012 |
| 20120213238 | HIGH-POWER LASER UNIT WHEREIN LASER OUTPUT CAN BE ACCURATELY CORRECTED - A high-power laser unit capable of accurately correcting laser output from low to rated outputs, even when the laser unit has a laser power monitor which may be affected by environmental factors inside or outside the laser unit, by effectively reducing environmental factors. The laser unit has a laser power monitor for measuring laser output, and a laser controller for correcting the laser output by correcting an amount of excitation energy to a laser power supply so that a measurement value coincides with a laser output command value. The laser unit has a laser output commanding part for generating a laser output command. When it is not necessary to correct the laser output command, the laser output command is converted into an excitation energy command value and sent to the power supply. Otherwise, an output correcting part of the laser controller corrects the laser output command. | 08-23-2012 |
| 20130308668 | System For Driving Pulsed Laser Diode Pump - A power supply for laser systems is configured with a DC power source having an output source voltage, an energy accumulator operatively connected to the output of the DC power source, and a pump. Coupled between the accumulator and source is a first DC to DC stage with at least one switched-mode power converter which is operative to charge the accumulator with voltage. The charged voltage may be same or different from the source voltage. The power supply further includes a second DC to DC stage with at least one switched-mode power converter coupled between the accumulator and pump and operative to discharge accumulator to the same or different output voltage. The DC to DC converters are configured so that current pulses at the input of the pump each have a peak value greater than the power source current. | 11-21-2013 |
| 20140029635 | LASER POWER CONTROL USING BIAS AND MODULATION CURRENT FEEDBACK - Techniques are described for maintaining the extinction ratio of an output optical signal over temperature and aging. In some examples, the techniques may determine the instantaneous slope efficiency of the laser outputting the optical signal, while the laser is outputting the optical signal. Based on the determined slope efficiency, the techniques may determine the needed drive current components (e.g., at least one of the bias current and the modulation current) that results in maintaining the extinction ratio to within a desired range. | 01-30-2014 |
| 20140092929 | LASER SYSTEM FOR POWER TRANSMISSION - An optical power beam transmission systems, with a directional light transmitter and receiver. The transmitter contains an amplifying laser medium, and this together with a retroreflector in the receiver, forms a laser resonator. When lasing sets in, the receiver can extract optical power through an output coupler and convert it to electrical power. The gain medium may be a disc having a thickness substantially smaller than its lateral dimensions. The laser resonator is operated as a stable resonator to ensure safe operation. This is achieved by use of an adaptive optical element, for reducing the diameter of the energy beam impinging on the gain medium, thereby increasing the overlap between the energy beam and the gain medium. As the transmitter-receiver distance is changed, such as by movement of the receiver, the adaptive optical element focal length changes to ensure that the cavity remains within its stability zone. | 04-03-2014 |
| 20160254634 | EXCIMER LASER APPARATUS AND EXCIMER LASER SYSTEM | 09-01-2016 |
