Abstract:
Ein Microchip-Laser umfasst einen monolithischen Resonator (1), der einen doppelbrechenden Laserkristall (2) aufweist, wobei ein aus dem Resonator (1) ausgekoppelter Laserstrahl (9), der eine Laserwellenlange aufweist, entlang einer Laserstrahlachse (12) aus dem Resonator (1) austritt und die auf die Richtung der Laserstrahlachse (12) bezogene Lange (L) des Resonators (1) kleiner als 150 μm ist. Der Laserkristall (2) weist eine derartige auf die Richtung der Laserstrahlachse (12) bezogene Dicke (D) auf, dass bei einem in Richtung der Laserstrahlachse (12) erfolgenden Einfall eines die Laserwellenlange aufweisenden Lichtstrahls (16) auf den Laserkristall (2) zwischen dem ordentlichen und dem auBerordentlichen Strahl (17, 19), in welche der Lichtstrahl (16) im Laserkristall (2) aufgeteilt wird, bei einem einzeinen Durchlauf durch den Laserkristall (2) eine Phasenverschiebung im Bereich von TT/2 +/- π/4 auftritt.
Abstract:
A master oscillator power amplifier (MOPA) system includes an oscillator (12) having a neodymium-doped gadolinium vanadate gain- medium and delivering seed-pulses. A length of single mode fiber (14) is used to broaden the spectrum of the seed pulse. An amplifier (16) having a neodymium-doped yttrium vanadate gain-medium amplifies the spectrally broadened seed-pulses. The gain-spectrum of the amplifier partially overlaps the broadened pulse-spectrum, providing spectral selection of the seed-pulses in addition to amplification. This provides amplified output-pulses having a duration about one-third that of the corresponding seed-pulses.
Abstract:
본 발명은 펄스로 구동하는 파장 변환형 반도체 레이저에 관한 것으로, 더욱 상세하게는 펌프용의 반도체 레이저 다이오드 칩 외부에서 레이저 다이오드 칩을 포함하여 확장된 형태의 공진기를 형성하고, 상기 확장된 공진기 내부에 파장을 선택할 수 있는 필터를 삽입하여 펌프 레이저의 발진 파장을 반도체 레이저 다이오드 칩 외부에서 결정하는 펄스로 구동하는 파장 변환형 반도체 레이저에 관한 것이다.
Abstract:
An intra-cavity optical parametric oscillator. The oscillator includes means (30) for providing a non-linear loss for suppressing relaxation oscillations.
Abstract:
A compact optically-pumped solid-state laser designed for efficient nonlinear intracavity frequency conversion into desired wavelengths using periodically poled nonlinear crystals. These crystals contain dopants such as MgO or ZnO and/or have a specified degree of stoichiometry that ensures high reliability. The laser includes a solid- state gain media chip, such as Nd: YVO 4 , which also provides polarization control of the laser; and a periodically poled nonlinear crystal chip such as PPMgOLN or PPZnOLT for efficient frequency doubling of the fundamental infrared laser beam into the visible wavelength range. The described designs are especially advantageous for obtaining low- cost green and blue laser sources. Also described design of the continuously operated laser with an electro-optic element for modulation of the intensity of the laser output at frequencies up to hundred of megahertz. Such modulation is desired for various applications, including compact projectors with high resolution.
Abstract:
Anisotropic crystals such as Nd:YVO 4 , Nd:YLF, and Nd:GdVO 4 have become preferred gain materials for many laser applications. The anisotropic gain medium without ancillary compensation ensures there is no degradation of laser modes when passing through the gain medium. An optical power amplifier that incorporates an anisotropic gain medium achieves power scaling with multiple passes while also maintaining good mode matching between the laser and the pump during each pass. Preferred embodiments implement for multiple passes of a seed laser beam (100) through an anisotropic gain medium (102) with substantially zero angular beam displacement during each pass. The multi-pass system provides an economical, reliable method of achieving high TEM 00 power to meet the demands of micromachining, via drilling, and harmonic conversion applications.
Abstract:
A continuous wave Raman laser for producing visible laser output comprising: a resonator cavity; at least a first reflector and a second reflector said first and second reflectors being located at opposite ends of the resonator cavity; a laser gain medium located in the resonator cavity for generating a continuous wave fundamental beam which resonates within the resonator cavity when pumped by a pump beam from a pump source external to the resonator cavity; a solid Raman-active medium positioned in the resonator cavity for Raman shifting the fundamental beam to produce a continuous wave Raman beam which resonates within the resonator cavity; and a non-linear medium positioned in the resonator cavity for frequency converting the continuous wave Raman beam to a converted wavelength to produce a continuous wave converted beam.
Abstract:
A method for optically pumping a gain-medium with partially polarized or un-polarized pump-light having a wavelength at which that gain-medium has an absorption that is dependent on the polarization plane of the pump-light is disclosed. The pump-light is directed into the gain- medium. The strongest-absorbed polarization component of the pump- light is substantially absorbed and the weakest-absorbed polarization component is partially transmitted by the gain-medium. The polarization plane of the transmitted component is rotated through 90 degrees and the polarization-rotated pump-light is directed back into the gain-medium, wherein it is substantially absorbed.
Abstract:
A Q-switched laser arrangement comprising a laser medium; a saturable absorber; one or more optical elements defining a laser cavity, the laser cavity including the laser medium and the saturable absorber; a pump laser optically coupled to the laser medium for pumping the laser medium; a driver controlling generation of pump laser pulses by the pump laser such that Q-switched laser pulses generated by the laser arrangement are controlled externally with respect to the laser cavity.