Abstract: A light source wavelength modulator includes a substrate made of a material with a high light transmittance and a thermal conduction effect, a wavelength modulation layer formed on the substrate and made of a wavelength modulation material, and patternized or multilayered, and further having a spacer between the wavelength modulation layer and its corresponding light source for achieving the best light source wavelength modulation, such that a portion of light spectrum of an original solar light or LED having no response or poor response to the light receiver is converted into a range of the best application efficiency for improving the utility efficiency of the light source. The white light emitted from the LED is gone through a wavelength modulation to enhance the light emitting color rendering, conversion efficiency and using life.

Abstract: A micro-thruster for controlling the positioning of a satellite includes a solar concentrator for collecting solar energy and producing concentrated solar energy. A solar panel is positioned to receive the concentrated solar energy and thereby produces electrical energy which in turn energizes a diode-pumped fiber optic laser. The energized laser thus produces laser light which is transmitted to ejector material affixed to a satellite.

Abstract: A laser oscillator for improving efficiency of conversion from solar rays to laser beams is provided. The laser oscillator includes: a laser medium 31 excited by solar rays S to output laser beams; an output mirror 35 having a concave surface 35a opposed to an output end of the laser medium 31; and a light guide 20 having a reflector 22 extending from the output end of the laser medium 31 towards the outside of the laser medium 31 and reflecting the solar rays Sf to guide them to the laser medium 31.

Abstract: A surface emitting laser which is configured by laminating on a substrate a lower reflection mirror, an active layer, and an upper reflection mirror, which includes, in a light emitting section of the upper reflection mirror, a structure for controlling reflectance that is configured by a low reflectance region and a concave high reflectance region formed in the central portion of the low reflectance region, and which oscillates at a wavelength of ?, wherein the upper reflection mirror is configured by a multilayer film reflection mirror based on a laminated structure formed by laminating a plurality of layers, the multilayer film reflection mirror includes a phase adjusting layer which has an optical thickness in the range of ?/8 to 3?/8 inclusive in a light emitting peripheral portion on the multilayer film reflection mirror, and an absorption layer causing band-to-band absorption is provided in the phase adjusting layer.

Abstract: A laser with a spectral converter. The novel laser includes a spectral converter adapted to absorb electromagnetic energy in a first frequency band and re-emit energy in a second frequency band, and a laser gain medium adapted to absorb the re-emitted energy and output laser energy. The spectral converter includes a plurality of quantum dots having an emission spectrum matching an absorption spectrum of the gain medium. In an illustrative embodiment, the spectral converter is adapted to convert broadband energy to narrowband energy, and the gain medium is a REI-doped solid-state laser gain medium.

Abstract: Object: To provide a solar light pumped laser and a cooling method of a solar light pumped laser. Means for Solving the Problems: A solar light pumped laser performing laser oscillation by pumping a laser medium with solar light, the solar light pumped laser including, a laser medium 12, a container device 14 that supports the laser medium 12 therein, the container device 14 being provided with a focusing optical element 22 for irradiating solar light focused along the laser medium 12, while retaining cooling liquid in a space between the laser medium 12 and the container device 14, and additionally, a pair of optical reflection elements (16, 18) arranged adjacent to the opposing ends of the laser medium. An end of the container device 14 has Brewster's angle. Further, the cooling liquid according to the present invention contains water functioning as an optical medium to form a water lens simultaneously with cleaning the focusing optical element 22.

Abstract: A solar light pumped laser performing laser oscillation by pumping a laser medium with solar light, the solar light pumped laser including, a laser medium 12, a container device 14 that supports the laser medium 12 therein, the container device 14 being provided with a focusing optical element 22 for irradiating solar light focused along the laser medium 12, while retaining cooling liquid in a space between the laser medium 12 and the container device 14, and additionally, a pair of optical reflection elements (16, 18) arranged adjacent to the opposing ends of the laser medium. An end of the container device 14 has Brewster's angle. Further, the cooling liquid according to the present invention contains water functioning as an optical medium to form a water lens simultaneously with cleaning the focusing optical element 22.

Abstract: A solid-state laser includes a high-absorption coefficient solid-state gain medium such as Nd:YVO.sub.4 that is side pumped with a semiconductor laser diode array. The resonant cavity of the solid-state laser is positioned so that the TEM.sub.00 mode is spaced from the face of the laser through which the laser is pumped by a distance sufficient to reduce diffraction losses but sufficiently near to allow coupling of pump light into the gain mode. The gain medium, the doping level of the gain medium, and the operating temperature of the pump laser are selected to efficiently couple pump light into the gain mode. The pump laser is positioned to side pump the gain medium without collimating or focusing optics between the pump laser and the face of the gain medium. A gap between the pump laser and the gain medium is empirically selected to match the angular extent of the pump laser output light to the height of the gain mode at the position of the gain mode fixed to optimize coupling and diffraction losses.

Abstract: In a solid-state laser device having a laser medium, a reflector member has first and second curved portions surrounding first and second reflector axes, respectively, and an extension portion extended from the first and the second curved portions towards a principal surface of the laser medium for defining an internal space together with the curved portions. Within the internal space, first and second lamps are disposed farther from the principal surface than the first and the second reflector axes, respectively, with first and second lamp axes of the first and the second lamps juxtaposed to the reflector axes and an optical axis of the laser medium. Each curved portion has an arcuate internal surface which forms a partially circular cylinder having a center axis as the reflector axis. Alternatively, the arcuate internal surface of each curved portion forms a partially elliptic cylinder having a symmetry axis as the reflector axis and an outside focal line with which the lamp axis substantially coincides.

Abstract: A solar pumped laser has its lasing path lengthened by forming a square loop in the lasing path by means of bending mirrors. Solar radiation is collected and concentrated into a donut shaped intensity pattern. This intensity pattern is directed onto the lasing path such that there is a maximum fit of the solar intensity pattern to the square loop laser cavity.

Abstract: A solar pumped laser in which the lasant is a gas that will photodissociate and lase when subjected to sunrays. Sunrays are collected and directed onto the gas lasant to cause it to lase.