Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 6804042 | Method for producing highly accurate frequency and FM of a laser A method and apparatus for accurately and precisely controlling the frequency (wavelength) and periodic frequency modulation of a laser are provided. An ADC (Analog to Digital Converter) is used to sample the output of a modified interferometer used as a delay line ... | 10/12/2004 |
| 6754403 | Acousto-optic add/drop multiplexer with retro-reflection and wavelength selective optical cross-connect An acousto-optical add/drop multiplexer includes an acousto-optical switch including a first optical port coupled to a first polarization splitter, at least one polarization converter coupled between the first polarization splitter and a second polarization splitter... | 06/22/2004 |
| 6735234 | Passively mode-locked optically pumped semiconductor external-cavity surface-emitting laser A passively mode-locked optically pumped semiconductor vertical-external-cavity surface-emitting laser (OPS-EXSEL) is disclosed. The laser is mode locked by a semiconductor saturable absorber mirror (SESAM) which forms part of an external cavity. Both the beam-quali... | 05/11/2004 |
| 6718076 | Acousto-optic tunable filter with segmented acousto-optic interaction region An acousto-optic tunable filter that includes a polarization beamsplitter, a multi-segment interaction region and a polarization beam combiner is described. The polarization beamsplitter generates a first and a second polarized optical signal. The multi-segment opti... | 04/06/2004 |
| 6671425 | Method and system for acoustically tuning a light source The present invention relates to an integrated light source having first and second optical waveguides defining a first optical coupling region for coupling light therebetween. At least one of the optical waveguides includes a gain medium configured to em... | 12/30/2003 |
| 6671304 | Amplitude-modulated laser for high-bandwidth communications systems The present invention has applications in high-bandwidth communications systems and other applications that utilize modulated optical energy. In one aspect of the invention, a short cavity diode-pumped laser generates optical energy that may be modulated ... | 12/30/2003 |
| 6667995 | ultrashort pulse laser oscillator For the sake of no needing to provide a mechanically actuating section such as a rotating mechanism thereby to be capable of realizing stable ultrashort pulse laser oscillation, an ultrashort pulse laser oscillator comprises a laser resonator composed of ... | 12/23/2003 |
| 6654391 | Method for operating Q-switched lasers with intracavity frequency conversion An intracavity frequency converted, Q-switched laser and method for operating such laser to obtain high output power in secondary pulses at a converted frequency. The secondary pulses are generated by a intracavity frequency conversion element from primar... | 11/25/2003 |
| 6624889 | Cascaded filter employing an AOTF and narrowband birefringent filters An optical channel monitor (OCM) or filter for analyzing an incident light carrying a number of narrow band signal channels such as WDM or DWDM channels. The OCM or filter use an acousto-optic tunable filter to receive and refract from an incident light a... | 09/23/2003 |
| 6618404 | Method for producing highly accurate frequency and FM of a laser A method and apparatus for accurately and precisely controlling the frequency (wavelength) and periodic frequency modulation of a laser are provided. An ADC (Analog to Digital Converter) is used to sample the output of a modified interferometer used as a ... | 09/09/2003 |
| 6600590 | Speckle suppressed laser projection system using RF injection A system and method for reducing or eliminating the speckle intensity distribution of a laser imaging system. In one embodiment of the invention, a radio frequency signal is injected into a semiconductor laser light source (12) for a projection system (10... | 07/29/2003 |
| 6587483 | Q-switched solid state laser with adjustable pulse length A Q-switched solid state laser is disclosed comprising a pump radiation source, whose pump radiation is focused through focusing elements in the laser crystal, a resonator formed by reflecting surfaces in which at least one laser crystal, an acousto-optic... | 07/01/2003 |
| 6563845 | Optical modulation device The invention relates to an optical modulation device for coupling an entering radiation field (12), with which an incident radiation field (40) is divided into a transmitted branch (40T) and a diffracted branch (40B) by means of a first acousto-optical m... | 05/13/2003 |
| 6563844 | High loss modulation acousto-optic Q-switch for high power multimode laser A Q-switch modulator for a high power laser having a randomly polarized output beam and large divergence angle employs a cascaded arrangement of longitudinal mode acousto-optic modulators, each of which has a Raman Nath or near Raman Nath interaction leng... | 05/13/2003 |
| 6370167 | Double-passage acousto-optical device and laser A double-passage acousto-optical device including an acousto-optical switch having a first polarization conversion region connected between first input and output ports, and a second conversion region connected between second input and output ports; and a... | 04/09/2002 |
| 6339604 | Pulse control in laser systems A pulsed laser system includes a laser pump, a laser rod, a reflector interposed between the laser pump and the laser rod, through which energy from the laser pump enters the laser rod, an output reflector through which energy is emitted from the laser ro... | 01/15/2002 |
| 6263006 | Electroluminescent solid state device An electroluminescent solid state device includes an active body member that is formed of a single crystalline metal oxide, such as aluminum oxide, that is doped with a rare earth element, such as erbium and/or terbium and an activator atom such as oxygen... | 07/17/2001 |
| 6246706 | Laser writing method and apparatus A laser writing system includes a high reflector and an output coupler that define an oscillator cavity. A gain medium and a mode locking device are positioned in the oscillator cavity. A diode pump source produces a pump beam that is incident on the gain... | 06/12/2001 |
| 6185231 | Yb-doped:YCOB laser A tunable, solid state laser device with both visible and infrared laser emission is developed with a trivalent ytterbium-doped yttrium calcium oxyborate crystal as the host crystal. The Yb:YCOB crystal generates an infrared fundamental light over a wide ... | 02/06/2001 |
| 6157660 | Apparatus for generating linearly-orthogonally polarized light beams The present invention relates to apparatus for providing orthogonally polarized light beams for use in precision metrology applications such as in the measurement of length or length changes using interferometric techniques. An input beam is introduced to... | 12/05/2000 |
| 6148011 | Wavelength sliced self-seeded pulsed laser A laser to produce pulses of light having predetermined spectral shapes, comprising a waveguide, an optical pump source, a gain medium to produce seed radiation, and a modulator and an array of Bragg gratings to modify the properties of the seed radiation... | 11/14/2000 |
| 6129884 | Stereolithographic method and apparatus with enhanced control of prescribed stimulation production and application A rapid prototyping and manufacturing (e.g. stereolithography) method and apparatus for producing three-dimensional objects by selectively subjecting a liquid or other fluid-like material to a beam of prescribed stimulation. In a preferred embodiment a so... | 10/10/2000 |
| 6072813 | Device for controlling light pulses by a programmable acoustooptic device A programmable acoustooptic device including an elastooptic medium configured to receive an input optical pulse and an acoustic wave; an acoustic transducer configured to generate the acoustic wave in the elastooptic medium along a defined direction; and ... | 06/06/2000 |
| 6067308 | Electroluminescent solid state device An electroluminescent solid state device includes an active body member that is formed of a single crystalline metal oxide, such as aluminum oxide, that is doped with a rare earth element, such as erbium and/or terbium and an activator atom such as oxygen... | 05/23/2000 |
| 6041092 | Digital circuit to count like signals in a data word A digital circuit for counting the number of zeroes or ones in a data word comprising a plurality of series paths leading to one-hot encoded outputs. Each one-hot encoded output indicates a different number of like signals in the input data word. One of t... | 03/21/2000 |
| 6031854 | Diode-pumped cascade laser for deep UV generation A two-step, diode-pumped solid-state laser is disclosed. A diode laser source pumps a first solid-state laser. The first solid-state laser in-turns pumps a second solid-state laser. The second solid-state laser contains all the parameters suitable for eff... | 02/29/2000 |
| 5970077 | Apparatus for efficiently transforming a single frequency, linearly polarized laser beam into principally two orthogonally polarized beams having different frequencies Electro-optical devices comprising a multifaceted anisotropic acousto-optical crystal for transforming a single-frequency beam comprising two individual linearly-orthogonally, polarized input beams into an output beam having two linearly-orthogonally, pol... | 10/19/1999 |
| 5936981 | Wavelength selectable laser oscillator in wavelength tunable laser An object of the present invention is to provide a wavelength selectable laser oscillator in wavelength tunable laser by which the rate of repetitive pulse oscillation of laser beam in a laser resonator can be markedly increased in comparison with that of... | 08/10/1999 |
| 5933440 | Electronic-laser system for outputting radio-frequency signal and pulse laser beam synchronous with radio-frequency signal A master radio-frequency signal output from a master oscillator is input to a frequency converter. The frequency converter generates and outputs a multiplied signal having a frequency higher than that of the master radio-frequency signal by using the mast... | 08/03/1999 |
| 5923685 | Wavelength selectable laser oscillator in wavelength tunable laser An object of the present invention is to provide a wavelength selectable laser oscillator in wavelength tunable laser by which high-speed tuning of wavelength can be achieved while utilizing continuous-wave laser beam as the excited laser beam. The wavele... | 07/13/1999 |
| 5917844 | Apparatus for generating orthogonally polarized beams having different frequencies Electro-optical devices for transforming a single-frequency, linearly polarized input beam from a light source introduced into a multifaceted anisotropic acousto-optical crystal into an output beam having two orthogonally polarized, output beam components... | 06/29/1999 |
| 5862164 | Apparatus to transform with high efficiency a single frequency, linearly polarized laser beam into beams with two orthogonally polarized frequency components orthogonally polarized An electro-optical apparatus transforms a single frequency, linearly polarized laser input beam (18) from a light source (10) into an output beam (36) having two collinear orthogonally polarized output beam components (32,33) differing in frequency from e... | 01/19/1999 |
| 5835512 | Wavelength selecting method in wavelength tunable laser and wavelength selectable laser oscillator in wavelength tunable laser An object of the present invention is to electrically tune and control an oscillating wavelength of a laser at high rate having a good reproducibility without providing any mechanically movable section in the laser resonator. To achieve the object, a lase... | 11/10/1998 |
| 5812567 | Wavelength tunable mode-locking optical fiber laser The wavelength tunable mode-locking optical fiber laser comprises non-linear amplifying loop mirror part having a light pumping lase diode, a gain medium doped optical fiber having the gain medium for oscillating the rambling light wave sequentially, a di... | 09/22/1998 |
| 5790574 | Low cost, high average power, high brightness solid state laser A high average power, high brightness solid state laser system. We first produce a seed laser beam with a short pulse duration. A laser amplifier amplifies the seed beam to produce an amplified pulse laser beam which is tightly focused to produce pulses w... | 08/04/1998 |
| 5748655 | Intracavity modulated pulsed laser and methods of using the same An intracavity modulated pulsed laser and methods of using the same. In one preferred form, an intracavity modulated pulsed laser comprises an amplification medium, a pulsed pumping source, a beam modulator, and two mirrors, one totally reflective and one... | 05/05/1998 |
| 5742634 | Picosecond laser A laser system which generates pulses with a duration in the range of about 60 to 300 ps at an energy level of up to a few milli-Joules per pulse (mJ/p) with near diffraction limited beam quality. A laser crystal is pumped (excited) by diode lasers. A res... | 04/21/1998 |
| 5734666 | Method for selecting wavelength in wavelength-tunable lasers and laser oscillators capable of selecting wavelengths in wavelength-tunable lasers In order to eliminate a mechanically movable section, such as a rotation mechanism of a diffraction grating, to achieve a compact fabrication of the whole apparatus, and to realize stable action for selecting a wavelength, a laser oscillator selecting a w... | 03/31/1998 |
| 5724373 | Microphotonic acousto-optic tunable laser A tunable laser that includes a laser amplifier and an acousto-optic filter (AOTF). The AOTF includes a waveguide having first and second ports. A first polarization filter passes light of a first polarization state, the first polarization filter being lo... | 03/03/1998 |
| 5721749 | Laser pulse profile control by modulating relaxation oscillations A method and apparatus for controlling the form and timing of pulses emitted by a high-power solid-state laser, without the need for complex feedback circuits. The width and peak intensity of relaxation pulses emitted by the laser are controlled by use of... | 02/24/1998 |
