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| Number | Title | Issue Date |
| 6411323 | High power marking system achieved through power scaling via multiplexing Power scaling by multiplexing multiple fiber gain sources with different wave-lengths is useful in printing applications requiring higher optical powers to perform the printing function, such as through thermal inducement in thermal ablation, thermal fusi... | 06/25/2002 |
| 6407855 | Multiple wavelength optical sources Optical pumping arrangements are provided for the broadband or multiple wavelength pumping of optical sources. Sources may be based on Raman gain media and may use multiple output couplers to couple out different wavelength ranges. Cascaded Raman resonato... | 06/18/2002 |
| 6404542 | Multiple emitter semiconductor laser pump source for scaling of pump power and generation of unpolarized light for light signal amplification A pump source for rare earth and Raman amplifiers or for distributed amplification uses two or more light sources to generate two source beams that are combined by a beam combiner to form the output pump beam. In accordance with one embodiment, the light ... | 06/11/2002 |
| 6388806 | Upgradable, gain flattened fiber amplifiers for WDM applications A multistage optical fiber amplifier (OFA) system is designed to be upgraded with the addition of pump power when signal capacity of an optical communication link is correspondingly increased. The system includes a gain flattening filter (GFF) that remain... | 05/14/2002 |
| 6367335 | Strain sensor for optical fibers A strain sensor is disclosed for example for use in a Bragg fiber grating, in which piezoelectric actuators are arranged to compress or extend the fiber, and a capacitance micrometer for measuring the strain on the fiber in a servo loop with the actuators... | 04/09/2002 |
| 6356574 | High power, reliable optical fiber pumping system with high redundancy for use in lightwave communication system A multistage optical amplifier pumping system with built-in redundant reliability for lightwave communication system provides plural levels of redundancy. A first level of redundancy deals with redundancy in the form of plural primary laser diode sources ... | 03/12/2002 |
| 6353499 | Optical fiber amplifier with oscillating pump energy An optical fiber amplifier has an amplification stage that uses an optical fiber pumped with pump energy of a first wavelength that oscillates through the gain medium. In one embodiment, the pumping is essentially a cavity resonator that is coupled to eit... | 03/05/2002 |
| 6347100 | Short wavelength fiber laser A fiber laser uses a mechanism to prevent a thermally induced shift of the gain spectrum to a range that causes the laser to become destabilized when operated at a first signal wavelength. By establishing a nominal gain spectrum that is further from the u... | 02/12/2002 |
| 6347007 | Semiconductor laser high power amplifier system A high power laser optical amplifier system for material processing comprises multiple stage fiber amplifiers with rejection of propagating ASE buildup in and between the amplifier stages as well as elimination of SBS noise providing output powers in the ... | 02/12/2002 |
| 6345141 | Double-clad optical fiber with improved inner cladding geometry A double-clad optical fiber has an inner cladding that has a torsional stress induced within it during manufacture. By rotating the fiber preform before curing of the inner cladding layer, a physical stress may be permanently imparted to the inner claddin... | 02/05/2002 |
| 6335941 | Semiconductor laser highpower amplifier system A high power laser optical amplifier system for material processing comprises multiple stage fiber amplifiers with rejection of propagating ASE buildup in and between the amplifier stages as well as elimination of SBS noise providing output powers in the ... | 01/01/2002 |
| 6330257 | Polarization-insensitive laser stabilization using multiple waveguide gratings The effectiveness of reflected light to stabilize the operational characteristics of a semiconductor diode laser varies with the polarization orientation of the reflected light. Stabilization failure can occur if the polarization orientation of the reflec... | 12/11/2001 |
| 6304585 | Frequency conversion system Laser diode pumped mid-IR wavelength sources include at least one high power, near-IR wavelength, injection and/or sources wherein one or both of such sources may be tunable providing a pump wave output beam to a quasi-phase matched (QPM) nonlinear freque... | 10/16/2001 |
| 6301273 | Power enhanced frequency conversion system A frequency conversion system includes at least one source providing a first near-IR wavelength output including a gain medium for providing high power amplification, such as double clad fiber amplifier, a double clad fiber laser or a semiconductor tapere... | 10/09/2001 |
| 6301272 | Resonant pumped short cavity fiber laser with optical feedback stabilization A fiber laser or fiber amplifier uses resonant pumping of the gain medium by providing a pump resonator that establishes a resonator cavity at the pump wavelength which includes the pumped gain medium. The pump resonator may be of a distributed feedback (... | 10/09/2001 |
| 6301271 | Frequency conversion system A frequency conversion system comprises first and second gain sources providing first and second frequency radiation outputs where the second gain source receives as input the output of the first gain source and, further, the second gain source comprises ... | 10/09/2001 |
| 6297903 | Multiple stage optical fiber amplifier and signal generator An optical amplifier makes use of a co-propagating fiber amplifier stage and a counter propagating fiber amplifier stage. One of the stages is preferably a low noise stage, while the other is a high gain stage, typically the output stage. The low noise st... | 10/02/2001 |
| 6298187 | High power fiber gain media system achieved through power scaling via multiplexing Power scaling by multiplexing multiple fiber gain sources with different wavelengths, pulsing or polarization modes of operation is achieved through multiplex combining of the multiple fiber gain sources to provide high power outputs, such as ranging from... | 10/02/2001 |
| 6295304 | Resonant pumped short cavity fiber laser with multiple optical resonators A fiber laser or fiber amplifier uses resonant pumping of the gain medium by providing a pump resonator that establishes a resonator cavity at the pump wavelength which includes the pumped gain medium. The pump resonator may be of a distributed feedback (... | 09/25/2001 |
| 6282016 | Polarization maintaining fiber lasers and amplifiers A number of variations are provided of a device that provides an amplified single polarization optical signal. Each of these relies on the use of a non-polarization maintaining gain medium through which the signal is directed, and a polarization shifter a... | 08/28/2001 |
| 6275632 | High power fiber gain media system achieved through power scaling via multiplexing Power scaling by multiplexing multiple fiber gain sources with different wavelengths, pulsing or polarization modes of operation is achieved through multiplex combining of the multiple fiber gain sources to provide high power outputs, such as ranging from... | 08/14/2001 |
| 6275250 | Fiber gain medium marking system pumped or seeded by a modulated laser diode source and method of energy control Double clad fiber gain medium systems particularly adapted for marking indicia on surfaces of articles are disclosed. These systems provide a modulated output from a pump or seed semiconductor laser source to a double clad fiber gain medium which provides... | 08/14/2001 |
| 6272162 | Visible wavelength, semiconductor optoelectronic device with a high power broad, significantly laterally uniform, diffraction limited output beam A Group III-V semiconductor optoelectronic device provides for visible wavelength light output having a more laterally uniform, high power beam profile, albeit still quasi-Gaussian. A number of factors contribute to the enhanced profile including an impro... | 08/07/2001 |
| 6266355 | Group III-V nitride laser devices with cladding layers to suppress defects such as cracking A Group III-V nitride compound semiconductor light emitting device is constructed without the employing homogeneous layers of AlGaN. Instead of homogeneous AlGaN cladding layers, GaN cladding layers are utilized. Since high temperature growths that accomp... | 07/24/2001 |
| 6259842 | Monitoring system for a high power light source A monitoring apparatus for a high power light source comprises a fiber medium containing a high power output for an application with a first monitoring tap optically coupled to the fiber medium for removing a small portion of light from the output to moni... | 07/10/2001 |
| 6240116 | Laser diode array assemblies with optimized brightness conservation The invention relates to laser diode arrays having high beam quality and high beam brightness. In one approach, a laser diode array package includes a mount and first and second laser diode arrays disposed on the mount. Each of the laser diode arrays defi... | 05/29/2001 |
| 6240119 | Apparatus for providing a stabilized laser source Apparatus is provided for an improved stabilized laser source comprising a laser source having a light beam output and an electrical input. An optical waveguide, such as an optical fiber, having an input end is optically coupled to the laser source to rec... | 05/29/2001 |
| 6236498 | Upgradable, gain flattened fiber amplifiers for WDM applications A multistage optical fiber amplifier (OFA) system is designed to be upgraded with the addition of pump power when signal capacity of an optical communication link is correspondingly increased. The system includes a gain flattening filter (GFF) that remain... | 05/22/2001 |
| 6233259 | Fiber grating stabilized diode laser A fiber Bragg grating is used to stabilize the intensity and frequency fluctuations of a diode laser. The diode laser is connected with an opto-mechanical apparatus to the fiber which contains the grating. The grating is formed in the guided-mode region o... | 05/15/2001 |
| 6229828 | High power pumped MID-IR wavelength devices using nonlinear frequency mixing (NFM) Laser diode pumped mid-IR wavelength sources include at least one high power, near-IR wavelength, injection and/or sources wherein one or both of such sources may be tunable providing a pump wave output beam to a quasi-phase matched (QPM) nonlinear freque... | 05/08/2001 |
| 6222864 | High brightness laser diode source Coherent light sources combining a semiconductor optical source with a light diverging region, such as a flared resonator type laser diode or flared amplifier type MOPA, with a single lens adapted to correct the astigmatism of the light beam emitted from ... | 04/24/2001 |
| 6215809 | Stabilization of laser sources with closely-coupled optical reflectors using an internal dither circuit Apparatus for providing a laser source optically coupled to an optical waveguide, such as an optical fiber, having a reflective grating positioned from the output facet of the laser source a distance equal to or greater than the coherence length of the la... | 04/10/2001 |
| 6212310 | High power fiber gain media system achieved through power scaling via multiplexing Power scaling by multiplexing multiple fiber gain sources with different wavelengths, pulsing or polarization modes of operation is achieved through multiplex combining of the multiple fiber gain sources to provide high power outputs, such as ranging from... | 04/03/2001 |
| 6192713 | Apparatus for the manufacture of glass preforms A method and apparatus is disclosed for the manufacture of an optical fiber preform having incorporated therein a comparatively high concentration of rare earth dopant material, and which thus can be drawn and processed into an optical fiber having low nu... | 02/27/2001 |
| 6185230 | Resonant pumped short cavity fiber laser A fiber laser or fiber amplifier uses resonant pumping of the gain medium by providing a pump resonator that establishes a resonator cavity at the pump wavelength which includes the pumped gain medium. The pump resonator may be of a distributed feedback (... | 02/06/2001 |
| 6181465 | Optical fiber gain medium with wavelength selective core filter An optical fiber used as the active amplifying medium in a fiber laser is arranged to have a high insertion loss at an undesired frequency, while retaining a low insertion loss at a desired lasing frequency. In one embodiment, loss at a Raman-shifted freq... | 01/30/2001 |
| 6181721 | Visible wavelength, semiconductor optoelectronic device with a high power broad, significantly laterally uniform, diffraction limited output beam A Group III-V semiconductor optoelectronic device provides for visible wavelength light output having a more laterally uniform, high power beam profile, albeit still quasi-Gaussian. A number of factors contribute to the enhanced profile including an impro... | 01/30/2001 |
| 6174748 | Method of forming a tapered section in a semiconductor device to provide for reproducible mode profile of the output beam A method for fabricating a high power laser diode device with an output emission with a nearly circular mode profile for efficient coupling into an optical fiber. A vertical taper waveguide and a window tolerance region are formed in a base structure of t... | 01/16/2001 |
| 6167075 | High power, reliable optical fiber pumping system with high redundancy for use in lightwave communication systems An optical amplifier pumping system with built-in redundant reliability for lightwave communication system provides plural levels of redundancy. A first level of redundancy deals with redundancy in the form of plural primary laser diode sources in the lig... | 12/26/2000 |
| 6160568 | Laser marking system and method of energy control A laser marking system comprises a high power fiber laser consisting of a double clad fiber having a doped core surrounded by an inner pump cladding and providing an optical output for marking; a high power laser diode source for pumping the double clad f... | 12/12/2000 |
