摘要:
A laser is disclosed comprising: a source of optical pumping radiation; a lasant rod; an input mirror; two quarter-wave plates; polarizing means, adjacent to a quarter-wave plate, for polarizing said lasant light radiated from said rod; second harmonic generating means for producing an output at twice the frequency at which said rod lases; and an output coupler.
摘要:
The invention is directed to a solid state laser wherein the pump sources are connected with holding parts and can be seated into a predetermined and reproducible position with mechanical guides and stops. In this way, an exchange of the pump sources is possible without a new adjustment or a readjustment.
摘要:
A laser device comprises a laser medium, a semiconductor light-emitting element for exciting the laser medium, a reflecting surface surrounding the outer periphery of the laser medium along its optical axis, and an opening provided in a part of the reflecting surface for causing light from the semiconductor light-emitting element to be incident upon the laser medium. The laser device is improved further by providing a polarizing plate and a light guide between the light-emitting element and the laser medium and by deviating the optical axis of excitation light from the central axis of the laser medium.
摘要:
In a laser apparatus which includes a laser medium exhibiting thermally induced optical distortions, and flash lamp mounted near the laser medium to provide laser pumping radiation, an absorbing filter is mounted between the flash lamp and the laser medium for absorbing radiation in the output spectrum of the lamp which exhibits a low fluorescence efficiency in the laser medium. By absorbing radiation with the low fluorescence efficiency in the laser medium, heat which develops in the laser medium can be limited to control the thermally induced optical distortions.
摘要:
A solid state laser is optically pumped by a semiconductive diode. The output facet of the pumping diode is butt-coupled to the input facet of the laser gain medium. The laser gain medium has a short absorption length (
摘要:
A solid state laser comprises a laser element formed from crystalline, ceramic, glass ceramic, glass, or plastic material in the configuration of a rod or slab. The cooling capabilities of the rods or slabs are improved by the provision of internal bores or slots through which a coolant can flow, and/or by the provision of a modified cross-sectional profile whereby the cooling surface is increased and the distance between the interior regions of the rod or slab and the cooling surface is reduced. Alternatively, the cooling capacity of the laser system is improved by providing a rotating arrangement of laser material wherein only specific portions of the laser materials are subjected to pumping while other portions are cooling.
摘要:
A simple, compact, and rugged laser comprises a solid transparent housing with two cavities. A laser medium is embedded in one cavity and a pump lamp in the other. By choosing for the housing and lamp envelope materials having thermal expansion coefficient similar to that of the laser medium, high power operation is feasible. An optional reflecting coating on the exterior of the housing enhances efficiency. A filter coating on the lamp envelope eliminates unwanted components of lamp radiation.
摘要:
Method and apparatus for cooling a slab-geometry solid state laser medium wherein at least one of the front or rear surfaces of the laser medium is in contact with a glass cover, and a coolant is passed over the outside of the glass cover.
摘要:
A laser with variable wavelength contains, as laser-active material in the laser resonator, a mixture consisting of a first substance present as granulate and of a fluid (liquid or gaseous) second substance. One of these substances is laser-active. The course of the dispersion curves (11-12, and 13-14, respectively) of the indices of refraction of the two substances is dependent on temperature and/or pressure or density, and the curves have at least one point of intersection. When the laser is excited, it emits at a wavelength (.lambda..sub.1, .lambda..sub.2) which corresponds to the point of intersection of the dispersion curves. The temperature and/or pressure or density of the mixture of substances within the laser resonator is varied for controlled selection of the emission wavelength (.lambda..sub.1, .lambda..sub.2).
摘要:
An optically pumped slab laser includes a solid-state lasing medium having a longitudinally extending lasing axis. A lamp is disposed proximate the lasing medium for emitting optical pumping radiation, and a reflector surrounds the lamp for directing the radiation at selected portions of the lasing medium. A fluid coolant is flowed across a major surface of the lasing medium to remove heat therefrom. The lasing medium exhibits a typical negative focal power lens effect distortion in portions proximate its lateral edges. The reflector is shaped to introduce a positive lens effect distortion, equal in magnitude to the negative lens effect distortion, to a central portion of the lasing medium between the lateral edge portions. External reflectors are positioned so as to direct a subsequently generated laser beam through alternate regions exhibiting the positive and negative focal power lens effect distortions, so that the beam subsequently exits the slab laser with no net distortion.