Abstract:
Ein optisch gepumpter Ultrakurzpuls-Mikrochiplaser zur Erzeugung einer Laseremission (LE) mit Femto- oder Pikosekundenpulsen weist ein Substrat (2b), ein verstärkendes Lasermedium (1), ein für optische Pumpstrahlung (PS) zumindest teilweise durchlässigen ersten Resonatorspiegel (3b) und insbesondere eine sättigbare Absorberstruktur (5) auf. Das Lasermedium (1) wird auf den Resonatorspiegel (3b) und das Substrat (2b) aufgebracht und nachfolgend in von der ursprünglichen Materialstärke auf eine Dicke von weniger als 200 μm reduziert. Um eine trotz dieser geringen Dicke befriedigende Leistungsaufnahme zu erreichen, wird die optische Pumpstrahlung (PS) so in das Lasermedium (1) eingekoppelt, dass Resonanz für die Laseremission (LE) und Intensitätsüberhöhung für die Pumpstrahlung (PS) auftreten.
Abstract:
A compact, optically-pumped solid-state microchip laser device uses efficient nonlinear intracavity frequency conversion for obtaining low-cost green and blue laser sources. The laser includes a solid-state gain medium, such as Nd:YVO4> and a nonlinear crystal. The nonlinear crystal is formed of periodically poled lithium niobate or periodically poled lithium tantalate, and the crystal is either MgO-doped, ZnO-doped, or stoichiometric to ensure high reliability. The nonlinear crystal provides efficient frequency doubling to translate energy from an infrared pump laser beam into the visible wavelength range. The laser device is assembled in a package having an output aperture for the output beam and being integrated with an optical bench accommodating a laser assembly. The package encloses and provides heat sinking for the semiconductor diode pump laser, the microchip laser cavity assembly, the optical bench platform, and electrical leads.
Abstract:
The secondary laser source of the invention comprises: at least a laser crystal (307), predisposed to receive in input a laser radiation and to emit in output a laser radiation having determined characteristics; an output optical unit (305), predisposed to receive the laser radiation emitted by the laser crystal (307) and to transmit to outside at least a laser radiation which exhibits a same wavelength as the laser radiation emitted by the laser crystal (307); a support (315) predisposed for supporting the laser crystal (307), which support (315) is made of a highly heat-conducting material; at least an active cooling element, located in contact with the support (315); a heat exchanger (318), struck by a cooling fluid, which is located in contact with the active cooling element (317). The invention also concerns a laser device comprising the secondary laser source.
Abstract:
A material having a surface and a dopant in the material distributed whereby the material has a spatially variant optical flux density profile. In accordance with the invention, tailored non-uniform gain profiles within a Yb:YAG laser component (rod, slab, disc, etc.) are achieved by a spatial material modification in the spatially masked pre-forms. High temperature-assisted reduction leads to the coordinate-dependent gain profiles, which are controlled by the topology of the deposited solid masks. The gain profiles are obtained by reducing the charge state of the laser-active trivalent Yb3+ ions into inactive divalent Yb2+ ions. This valence conversion process is driven by mass transport of ions and oxygen vacancies. These processes, in turn, affect the dopant distribution throughout the surface and bulk laser crystal. By reducing proportionally more Yb3+ ions at the unmasked areas of component, than in the masked areas, the coordinate-dependent or spatially-controlled gain profiles are achieved. Preferred masking materials are high temperature ceramic glazes and glasses. The masking includes the fabrication of frit, mixing this frit with de-ionized water to form slurry, deposition of the slurry on the surface of laser component or pre-form, and a heat treatment (firing) of the deposited layer. The invention can be used for the fabrication of laser rods, slabs, etc. with various concentrations and spatial localizations of dopants.
Abstract:
A laser system and method. The inventive laser includes an annular gain medium; a source of pump energy; and an arrangement for concentrating energy from the source on the gain medium. In a more specific implementation, a mechanism is included for rotating the gain medium to effect extraction of pump energy and cooling. In the illustrative embodiment, the pump source is a diode array. Energy from the array is coupled to the medium via an array of optical fibers. The outputs of the fibers are input to a concentrator that directs the pump energy onto a pump region of the medium. In the best mode, plural disks of gain media are arranged in an offset manner to provide a single resonator architecture. First and second mirrors are added to complete the resonator, hi accordance with the inventive teachings, a method for pumping and cooling a laser is taught. In the illustrative embodiment, the inventive method includes the steps of providing a gain medium; pumping energy into a region of the gain medium; moving the medium; extracting energy from the region of the medium; and cooling region of the medium.
Abstract:
A laser configuration producing up to 100's of Watts of output is provided, based on a solid-state gain medium, a source of pump energy which is detuned from the maximum absorption wavelength for the gain medium, and optics arranged to deliver the pump energy through an end of the gain medium to propagate along the length of the gain medium. The length of the gain medium and the doping concentration in the gain medium are sufficient the absorption length is on the order of lO's of millimeters, and more than 1/3 of the length, and that 90 percent or more of the pump energy is absorbed within two or fewer passes of the gain medium. A pump energy source that supplies 100 Watts to 1000 Watts or more.
Abstract:
The laser includes a resonant cavity formed between a first mirror and a second mirror. An unsensitized Erbium-doped crystal gain medium for producing laser gain is disposed within the resonant cavity. A saturable absorber is disposed within the resonant cavity. A pump source is positioned to energize the gain medium. The saturable absorber, the laser gain, the resonator length, and the second mirror being selected so that output pulses having a duration of less than 75 nanoseconds are generated by the laser.
Abstract:
Eine Zündeinrichtung für eine Brennkraftmaschine umfasst mindestens eine Pumplichtquelle, welche in Pumplicht bereitstellt. Ferner ist eine Lasereinrichtung (26) vorgesehen, die einen Laserimpuls (24) erzeugt zur Abstrahlung in einen Brennraum. Eine Lichtleitereinrichtung (28) überträgt das Pumplicht (60) von der Pumplichtquelle zur Lasereinrichtung (26). Es wird vorgeschlagen, dass ein laseraktiver Festkörper (44) ein passiver Q-Switch (46), ein Einkoppelspiegel (42) und ein Auskoppelspiegel (48) der Lasereinrichtung (26) als insgesamt monolithisches Teil (50) ausgebildet sind.
Abstract:
The present invention discloses a laser amplifier with high gain and low thermally induced optical aberrations. The amplifier designs allow simple multipass configurations making it possible to obtain an amplified laser beam of high quality combined very high overall gains comparable to those achievable with expensive regenerative amplifiers. The amplifier includes a thin active laser solid to create the population inversion and associated heat generation within the thin laser active solid possible for the desired gain value. The system includes a cooling device in thermal contact with the thin active laser solid to provide good heat transport and high reflectivity coatings at the wavelengths of the pump and laser wavelengths. The pump light source are laser diodes tuned to the maximum absorption of the laser active material. The amplifier also includes an optical system to transport the pump light to the laser active solid in such a way as to further confine the absorption of light along the two orthogonal directions in the plane of the laser active solid in order to get high population inversion and consequently high gains possible.