141 results about "Solid-state laser device" patented technology

An edge emitting solid state laser and method. The laser comprises at least one AlInGaN active layer on a bulk GaN substrate with a non-polar or semi-polar orientation. The edges of the laser comprise {1 1−2±6} facets. The laser has high gain, low threshold currents, capability for extended operation at high current densities, and can be manufactured with improved yield. The laser is useful for optical data storage, projection displays, and as a source for general illumination.

Apparatus and method for achieving improved performance in a solid-state laser. The solid-state laser apparatus preferably uses a laser gain medium in the shape of a disk wherein optical pump radiation is injected into the peripheral edge of the disk. In the preferred embodiment the laser gain medium is provided with optical coatings for operation in the active mirror configuration. Furthermore, the laser gain medium is pressure-clamped to a rigid, cooled substrate, which allows it to maintain a prescribed shape even when experiencing significant thermal load. A cooling medium can be provided to a heat exchanger internal to the substrate and / or flowed through the passages on the substrate surface, thereby directly cooling the laser gain medium. Sources of optical pump radiation are placed around the perimeter of the gain medium. Tapered ducts may be disposed between the sources and the gain medium for the purpose of concentrating optical pump radiation. With the proper choice of laser gain medium doping, pump source divergence and geometry, a uniform laser gain is achieved across large portions of the gain medium.

A semiconductor laser light source device and light source unit according to the present invention include a first plate-like member made of metal, to which a semiconductor laser array is joined along the end portion, a second plate-like member made of metal, in which an inlet opening portion, which introduces cooling fluid, and a cooling fluid draining channel, and a third plate-like member made of metal, which is formed along the area corresponding to the end portion and to which at least one cooling channel is provided through which cooling fluid flows in the longitudinal direction of the semiconductor laser array by communicating the cooling fluid introducing channel and the cooling fluid draining channel. Thus, the sectional area of the channel can be larger than that in the construction of the related art and the processing cost is reduced by comparison with the construction of the related art. The problems of blocking path with an extraneous matter and of high-pressure loss due to the path are overcome. Since the channel is provided along the longitudinal direction of the semiconductor laser array, the semiconductor laser array can be cooled efficiently.

A method for processing a brittle substrate includes first providing a brittle substrate having a substrate surface. Then applying a first laser beam onto the brittle substrate surface to form a pre-cut groove in the brittle substrate, the first laser beam being generated by a solid-state laser device. A second laser beam is then applied onto the brittle substrate surface along the precut groove to heat the brittle substrate, the second laser beam being generated by a gas laser device. Finally, a coolant is applied onto the brittle substrate along the pre-cut groove so as to cause formation of a through crack in the brittle substrate. The first laser beam can be generated by a solid-state laser device, the first laser beam should be of narrow diameter and high energy density, so the first laser beam can form a pre-cut groove rapidly and accurately without generation of micro-cracks, in addition, the pre-cut groove should have a better uniformity and linearity.

A laser-diode-pumped solid-state laser apparatus includes a laser rod, and laser diode devices that generate pumping light. Optical unit such as a reflection mirror and an optical waveguide medium is provided at a position in a laser resonator near a laser optical axis and not blocking the optical axis. A photo-detector detects a quantity of fluorescence generated from solid-state laser medium. The fluorescence quantity is compared with a predetermined value or a previously measured value. Thus degradation status of a laser diode light source is constantly diagnosed.

A semiconductor laser device including a laser element stack array emitting a two-dimensional array shaped group of laser beams consisting of rows of laser beams arranged linearly in parallel in a broken line configuration and optical elements arranged in front of the array, receiving rows of laser beams bent and collimated in a direction substantially perpendicular to the orientation of the broken line configuration. Laser beams are emitted from emitters or groups of emitters and are rotated by right angles so as to convert the laser beams to a plurality of rows aligned in parallel in an approximate ladder rung configuration and the distance between center axes of the rows of laser beams is shortened to condense the laser beams by converting them to a group of laser beams emitted from a common object and thereby making all laser beams converge to a single image.

A solid-state laser crystal constituting a laser-diode-excited solid-state laser apparatus or an optical fiber constituting a fiber laser apparatus or fiber laser amplifier is doped with one of Ho<3+>, Sm<3+>, Eu<3+>, Dy<3+>, Er<3+>, and Tb<3+> so that a laser beam is emitted from the solid-state laser crystal or the optical fiber, or incident light of the fiber laser amplifier is amplified, by one of the transitions from <5>S2 to <5>I7, from <5>S2 to <5>I8, from <4>G5 / 2 to <6>H5 / 2, from <4>G5 / 2 to <6>H7 / 2, from <4>F3 / 2 to <6>H11 / 2, from <5>D0 to <7>F2, from <4>F9 / 2 to <6>H13 / 2, from <4>F9 / 2 to <6>H11 / 2, from <4>S3 / 2 to <4>I15 / 2, from <2>H9 / 2 to <4>I13 / 2, and from <5>D4 to <7>F5. The above solid-state laser crystal or optical fiber is excited with a GaN-based compound laser diode.

In a solid state laser device, the device has a single outer housing (1) with a substantially enclosed structure, one or more inner housings (2) are disposed in the outer housing (1), an air purification unit (4) for purifying air and feeding the purified air to the inner housing (2) is provided at a part or the entire part of the inner housing (2), laser light sources (5, 6, 7) including a solid state laser medium (501) and an optical resonator and also including optical systems (10, 11, 901) for transmitting or blocking laser light (8) emitted from the laser light sources are arranged in the outer housing (1), and the laser light sources (5, 6, 7) and the optical systems (10, 11, 901) or a part of the optical systems are received in the inner housing (2). The solid state laser device is simple in structure, small in size, and inexpensive, and also, the device is constructed so that degradation of optical parts and moisture condensation are prevented and that it can supply laser light stably.

A laser device 1 is provided with: a solid sate laser medium made of GdVO4 or YVO4 to which Nd3+ is added, having first and second surfaces 10A, 10B facing each other; a high reflection film 12 formed on the first surface of the laser medium for reflecting light having a wavelength in a first wavelength range 880±5 nm and in a second wavelength range from 910 nm to 916 nm; a reflecting means 20 placed in a manner where an optical resonator of which the resonance Q-value for light having a wavelength in the second wavelength range is greater than the resonance Q-value for light of every wavelength in a third wavelength range from 1060 nm to 1065 nm is formed together with the high reflection film and the laser medium is positioned within the resonator; and an excitation light source 22 that outputs light having a wavelength in the first wavelength range for exciting the laser medium. Laser device 1 is formed so that light from the excitation light source is guided into the resonator in a direction different from the optical axis direction of the resonator, and enters into the laser medium. As a result, a solid state laser device having a high light-emission efficiency can be implemented.

A laser-diode-pumped solid-state laser apparatus includes a laser rod, and laser diode devices that generate pumping light. Optical unit such as a reflection mirror and an optical waveguide medium is provided at a position in a laser resonator near a laser optical axis and not blocking the optical axis. A photo-detector detects a quantity of fluorescence generated from solid-state laser medium. The fluorescence quantity is compared with a predetermined value or a previously measured value. Thus degradation status of a laser diode light source is constantly diagnosed.