Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 7630421 | Laser beam irradiation apparatus and laser working machine A laser beam irradiation apparatus includes an oscillation unit, an acousto-optic deflection unit for deflecting a laser beam oscillated by the oscillation unit, a condenser for condensing the deflected laser beam, and a control unit. The control unit determines an ... | 12/08/2009 |
| 7366221 | Laser apparatus and method of driving diffraction grating A laser apparatus is disclosed. The laser apparatus has a diffraction grating that receives laser light from a semiconductor laser, emits first order diffracted light having a predetermined wavelength to the semiconductor laser, and reflects zero-th order light, a r... | 04/29/2008 |
| 7248610 | Dual loop automatic power control for laser driver A laser driver. The laser driver comprises a diode driver, a power detector, a first extreme detector, a second extreme detector and a current controller. The diode driver receives bias and modulation currents to control a laser diode for generating light signals. T... | 07/24/2007 |
| 7149425 | Monitoring system for an optical transmitter Certain embodiments of the present invention provide a monitoring system configured to monitor output wavelengths, power, and channel switching of tunable lasers employed in an optical transmitter and provide feedback to those lasers, e.g., to lock on the wavelength... | 12/12/2006 |
| 7065114 | Apparatus and method for controlling optical disc write power A simply structured apparatus according to the present invention corrects an overdrive power level. A main controller allows an overdrive power generator to set an overdrive power current to zero, allows a base power controller to control a base power current with t... | 06/20/2006 |
| 7062170 | Optical communication system An optical communication system suitable for full duplex optical communication between a first and a second optical transceiver units. connected with each other by a single-core optical fiber. The first and second transceiver units may have different types of light ... | 06/13/2006 |
| 7042918 | Tunable laser source A tunable laser source of a Littman arrangement type has a wavelength selection mirror rotating around a position where a mode hop is suppressed in a wavelength variation, a feed screw receiving a driving force of a motor at one end to be rotated, in which another e... | 05/09/2006 |
| 6967978 | Light-emitting element driving device In a semiconductor laser driving device using a voltage drive system, a drive current of a semiconductor laser is controlled by a drive current control circuit so that a light intensity of light beam emitted from the semiconductor laser is equal to a predetermined l... | 11/22/2005 |
| 6922418 | Wavelength-variable light source apparatus A wavelength-variable light source apparatus having a wavelength calibration function of emitted light therefrom. The apparatus includes a semiconductor laser light source section, an external resonance section having a reflection surface for externally resonating e... | 07/26/2005 |
| 6856634 | Laser processing device and laser processing method The present invention provides a laser machining apparatus in a simple structure which can properly carry out laser machining by irradiating a laser beam easily at a predetermined energy density to a machining-target site in a predetermined range, and in addition, w... | 02/15/2005 |
| 6711190 | Laser transmitter bias circuit A laser transmitter bias circuit for a laser diode transmitter, for use in a optical transmission system, e.g. in commercial CATV systems. The laser transmitter bias circuit reduces power consumption and heat dissipation by eliminating the conventional need for a di... | 03/23/2004 |
| 6697408 | Q-switched cavity dumped CO2 laser 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 e... | 02/24/2004 |
| 6560250 | Laser diode drive signal processor and method for driving laser diode There is provided a laser diode drive signal processor for driving a laser diode to be used to emit a laser beam for accessing an optical information recording medium with the laser beam. The processor has an alternating current side driving current suppl... | 05/06/2003 |
| 6526077 | Line-scan laser beam profiler Power density profile of a laser beam is characterized by scanning a thin thread across the beam and registering the intensity of radiation scattered from the thread. The diameter of the beam along the scan direction is determined by measuring the width o... | 02/25/2003 |
| 6456634 | Circuit and method for recognizing an interruption in a light waveguide link A circuit method for recognizing an interruption in a light waveguide link, wherein the amplified spontaneous emission output by an intensifying fiber is monitored for recognizing an interruption along a light waveguide link having an intensifying fiber a... | 09/24/2002 |
| 6445721 | Laser diode light emission sensing circuit A laser diode light emission sensing circuit comprises a photodiode 3 which senses a lightwave signal of a laser diode to convert it into a current signal, an I/V converting circuit 4 which converts the current signal from the photodiode 3 into a voltage ... | 09/03/2002 |
| 6421362 | Charging and discharging circuit for pulse laser A charging and discharging circuit for a pulse laser which enables the pulse laser to increase an oscillation frequency. A charging and discharging circuit for a pulse laser, comprising a high-voltage power supply (18) for charging a capacitor (C0) with e... | 07/16/2002 |
| 6400741 | Emission timing control apparatus for pulsed laser An emission timing control apparatus for a pulsed laser including a magnetic pulse compression circuit having a switching section for carrying out a switching operation to connect and disconnect a charging power source to and from the magnetic pulse compr... | 06/04/2002 |
| 6330258 | Laser apparatus A simmer circuit 18 comprises a power supply unit 54 for the supply of a simmer current Is to an excitation lamp 22 and a control unit 56 for the control of the current value of the simmer current Is. In the control unit 56, a curren... | 12/11/2001 |
| 6282216 | Burst mode optical transmitter circuit A burst mode optical transmitter circuit comprises a semiconductor laser, a photodiode for monitoring the light output from the semiconductor laser, a current-voltage converting circuit for converting the current detected by the photodiode into a voltage,... | 08/28/2001 |
| 6246705 | Optical scanning device An optical scanning device is provided with a light source that emits a light beam, a driver that controls output power and modulation of the light beam emitted by the light source, a controller that transmits, to the driver, power control data and modula... | 06/12/2001 |
| 6233261 | Optical communications system Apparatus for simultaneously monitoring and controlling the wavelength of a plurality of semiconductor lasers whose wavelengths can be adjusted, the device including a wavelength filter including a wavelength division demultiplexer (WDM) arranged to recei... | 05/15/2001 |
| 6222862 | Control method of exciting a pulse laser and power supply unit for exciting a pulse laser A power supply unit provides therein a first power unit outputting a first excitation amplitude and operating from rising of a reference pulse signal outputted from a reference oscillator until rising of a first time delay signal having a time delay to th... | 04/24/2001 |
| 6137816 | Power source control apparatus for laser diode A power source control apparatus has a constant current circuit and plural laser diodes. Switching elements are connected in parallel between anodes and cathodes of the laser diodes. Forward voltage drop of the switching elements is set lower than forward... | 10/24/2000 |
| 6078604 | Laser oscillation apparatus A laser oscillation apparatus includes: a laser cavity unit for generating laser light by being provided a voltage and optically amplifying the generated light by means of a pair of mirrors; and a DC power source for supplying the voltage required for gen... | 06/20/2000 |
| 5999548 | White optical pulse source and applications The present invention relates to a white pulse source that produces spectrally shaped white pulses of a constant optical output power over a wide wavelength range. The white pulse source includes a pump pulse source for generating pump pulses with a cente... | 12/07/1999 |
| 5982794 | External resonator type of variable-wavelength semiconductor laser light source An external resonator type variable-wavelength LD light source which can compensate errors of a change in an oscillation wavelength caused by a change in an LD driving current, a change in the oscillation wavelength caused by a change in a temperature of ... | 11/09/1999 |
| 5930281 | Ion laser apparatus An ion laser apparatus having an electromagnet for converging plasma is disclosed for providing stabilized laser operation for a long time. An electromagnet control circuit provided within a power source is capable of changing either voltage or current of... | 07/27/1999 |
| 5761231 | Method and circuit arrangement for regulating the luminous power of a laser diode A process and circuit arrangement for regulating the luminous power of a laser diode in an optoelectronic point-by-point or line recording device for recording information on a recording material. A deviation is determined by comparing a luminous power se... | 06/02/1998 |
| 5604757 | Multichannel, programmable laser diode power supply, stabilizer and controller A system for controlling the operation of multiple laser diodes in a noise free and efficient manner. The system includes a control module that generates control signals to control and regulate the multiple laser diodes, and an input/output module that al... | 02/18/1997 |
| 5418806 | Power control device for laser emitting unit In a power controlling device for laser emitting apparatus, a laser diode and a photodiode are provided. Current is generated by the photodiode in accordance with the intensity of laser beam received. The current flows across a resistor to generate a volt... | 05/23/1995 |
| 5394419 | Circuit arrangement for limiting the power of the optical signal emitted by a laser diode In a circuit arrangement for limiting the power of the optical signal emitted by a laser, the current through the laser is supplied via a parallel connection of a plurality of series circuits of a transistor with a resistor. In addition, provision is made... | 02/28/1995 |
| 5383208 | Device and method to control the output power of laser diodes A device for the control of the output power of laser diodes designed to be coupled to an optical fiber for the tranmission of data comprises a photodiode that can be used to acquire a characteristic signal of the power emitted by the laser diode; digital... | 01/17/1995 |
| 5369655 | Output control method for laser system An output control method for a laser system comprised of a laser oscillator and a laser amplifier. The method enables the output energy to be stably controlled over a wide range, without changing the excitation energy, by controlling the delay (͌) of the... | 11/29/1994 |
| 5319656 | Thermal control for laser diode used in outside plant communications terminal A method and apparatus implementing the method are provided for controlling optical power output level of a laser diode modulated during a burst mode interval by digital data transitions within a shared logical bus optical communications network and over ... | 06/07/1994 |
| 5091914 | High-frequency discharge pumping laser device A high-frequency discharge pumping laser device is provided in which a high-frequency voltage is applied to a discharge tube to cause laser excitation. Light discharged from the discharge tube is measured by a photodiode to control an output of a laser po... | 02/25/1992 |
| 5036517 | Target illuminators and systems employing same Devices for illuminating a target with a beam of coherent energy. The device has a number of applications. In one, it is employed with a night vision system to make available additional energy which can be utilized by an image intensifier in the night vis... | 07/30/1991 |
| 5012475 | Analog compensation system for linear lasers An error compensation system is described which provides a linear laser signal. The error compensation system includes a first high power linear laser which is used to drive a signal onto an optical fiber. The signal on the optical fiber is tapped to prov... | 04/30/1991 |
| 4999840 | Stabilized synchronously pumped dye laser A length stabilized, dispersion compensated synchronously pumped mode locked dye laser is disclosed. The output of the dye laser is actively stabilized by monitoring the output power thereof and generating an error signal for actively adjusting the cavity... | 03/12/1991 |
| 4998254 | Stabilized synchronously pumped dye laser A length stabilized, dispersion compensated synchronously pumped mode locked dye laser is disclosed. The output of the dye laser is actively stabilized by monitoring the output power thereof and generating an error signal for actively adjusting the cavity... | 03/05/1991 |
