Abstract: A terahertz wave generation apparatus includes a plurality of laser light sources configured to generate laser beams respectively having different wavelengths; and a terahertz wave generating element configured to receive the laser beams having different wavelengths and generate a terahertz wave from the laser beams. The plurality of laser light sources include fiber laser light sources respectively including parameters that can be controlled independently, and the terahertz wave generating element includes a nonlinear optical crystal.

Abstract: A terahertz wave generation apparatus includes a plurality of laser light sources configured to generate laser beams respectively having different wavelengths; and a terahertz wave generating element configured to receive the laser beams having different wavelengths and generate a terahertz wave from the laser beams. The plurality of laser light sources include fiber laser light sources respectively including parameters that can be controlled independently, and the terahertz wave generating element includes a nonlinear optical crystal.

Abstract: A wavelength conversion light source apparatus includes a fundamental wave light source configured to emit a fundamental wave, a nonlinear crystal configured to convert a wavelength of the fundamental wave by being irradiated with the fundamental wave and making the fundamental wave pass therethrough, and a movement unit configured to place the nonlinear crystal thereon and continuously move the nonlinear crystal within a plane, where a phase matching condition is not violated, so that a passage path of the fundamental wave passing through the nonlinear crystal is changed.

Abstract: A coherent Doppler lidar which can oscillate high energy pulses and output laser beams in a longer wavelength range of 1.5 ?m to the atmosphere is provided. The coherent Doppler lidar has a pulse laser an oscillation wavelength of which is controlled by means of injection locking of a seed light output from a master laser, wherein the pulse laser is a type in which a laser medium is disposed in a resonator, a pulse light of a predetermined repetition frequency is input to the laser medium as an excitation light, whereby pulse laser oscillation is generated in the resonator to output pulse laser beams from the resonator, and the laser medium being a type which has at least a region having Tm, Ho:YAG ceramics, and is excited by the excitation light to output pulse laser beams in 2 ?m wavelength band.

Abstract: A wavelength conversion light source apparatus includes a fundamental wave light source configured to emit a fundamental wave, a nonlinear crystal configured to convert a wavelength of the fundamental wave by being irradiated with the fundamental wave and making the fundamental wave pass therethrough, and a movement unit configured to place the nonlinear crystal thereon and continuously move the nonlinear crystal within a plane, where a phase matching condition is not violated, so that a passage path of the fundamental wave passing through the nonlinear crystal is changed.

Abstract: A coherent Doppler lidar which can oscillate high energy pulses and output laser beams in a longer wavelength range of 1.5 ?m to the atmosphere is provided. The coherent Doppler lidar has a pulse laser an oscillation wavelength of which is controlled by means of injection locking of a seed light output from a master laser, wherein the pulse laser is a type in which a laser medium is disposed in a resonator, a pulse light of a predetermined repetition frequency is input to the laser medium as an excitation light, whereby pulse laser oscillation is generated in the resonator to output pulse laser beams from the resonator, and the laser medium being a type which has at least a region having Tm, Ho:YAG ceramics, and is excited by the excitation light to output pulse laser beams in 2 ?m wavelength band.

Abstract: In order to generate efficiently a deep ultraviolet laser beam having a wavelength in a deep ultraviolet region and to make the generated laser beam to be high output, it is arranged in such that a laser beam having about 227 nm wavelength is generated by sum-frequency mixing of fourth harmonic of the laser beams obtained by amplifying semiconductor laser beams having 1064.0 to 1065.0 nm wavelengths by means of an optical fiber amplifier, and the laser beams obtained by amplifying semiconductor laser beams having 1557.0 to 1571.0 nm wavelengths by means of another optical fiber amplifier; and further laser beams having 198.4 to 198.7 nm wavelengths are generated by sum-frequency mixing of the above sum-frequency mixed laser beam and the above-described semiconductor laser beams having 1557.0 to 1571.0 nm wavelengths.

Abstract: The present invention provides a deep ultraviolet laser apparatus exhibiting high robustness which can generate laser beams in a wavelength region of wavelengths of from 198.3 to 198.8 nm, further may be loaded on a variety of apparatuses as a light source for lighting, and is practicable and a size of the whole structure of thereof is reduced. The deep ultraviolet laser apparatus is arranged in such that laser beams having a wavelength of from 1064 to 1065 nm pulse-output from a first light source is a first fundamental wave; fourth harmonic obtained by wavelength-converting the first fundamental wave by means of a first wave-length conversion means is a second fundamental wave; laser beams having a wavelength of from 1560 to 1570 nm pulse-output from a second light source is a third fundamental wave; second harmonic obtained by wavelength-converting the third fundamental wave by means of a second wave-length conversion means is a fourth fundamental wave; and laser beams having a wavelength of from 198.

Abstract: A saturable absorber functioning as a Q-switch is disposed on a path of a light in a laser resonator provided with a laser medium, the saturable absorber disposed in the laser resonator is transferred relatively toward the path of the light, and an initial transmittance of the saturable absorber in the case when the light passes through the saturable absorber is changed in order to achieve such effect that a scale of the whole equipment is not upsized, it is in excellent in workability and convenient, besides there is no fear of decreasing stability in a pulsed laser oscillation.

Abstract: A laser device which has an excellent characteristic originally exerted by an yttrium-aluminum-garnet crystal doped with neodymium and is entirely reduced in size by using an entirely downsized laser medium is provided. The laser device is constituted such that a laser medium is disposed in a resonator, excited light is incident upon the laser medium so as to cause laser oscillation in the resonator, and laser light is emitted from the resonator. An yttrium-aluminum-garnet single crystal is used as the laser medium, in which neodymium is added at a concentration exceeding an atomicity ratio of 1.3%.

Abstract: A laser device which has an excellent characteristic originally exerted by an yttrium-aluminum-garnet crystal doped with neodymium and is entirely reduced in size by using an entirely downsized laser medium is provided. The laser device is constituted such that a laser medium is disposed in a resonator, excited light is incident upon the laser medium so as to cause laser oscillation in the resonator, and laser light is emitted from the resonator. An yttrium-aluminum-garnet single crystal is used as the laser medium, in which neodymium is added at a concentration exceeding an atomicity ratio of 1.3%.