37 results about "Laser nd-yag" patented technology

A tunable laser and laser tuning method based on the use of a tunable etalon in reflection as a mirror within a laser cavity and forming an end reflective surface thereof. The laser emission wavelength is not necessarily at a wavelength of peak etalon reflectivity. A preferred embodiment makes use of a microelectromechanical etalon to tune an external cavity semiconductor.

A laser system, such as a master oscillator / power amplifier system, comprises a gain medium and a stimulated Brillouin scattering SBS mirror system. The SBS mirror system includes an in situ filtered SBS medium that comprises a compound having a small negative non-linear index of refraction, such as a perfluoro compound. An SBS relay telescope having a telescope focal point includes a baffle at the telescope focal point which blocks off angle beams. A beam splitter is placed between the SBS mirror system and the SBS relay telescope, directing a fraction of the beam to an alternate beam path for an alignment fiducial. The SBS mirror system has a collimated SBS cell and a focused SBS cell. An adjustable attenuator is placed between the collimated SBS cell and the focused SBS cell, by which pulse width of the reflected beam can be adjusted.

A microscope illumination apparatus includes an optical conversion unit that converts laser light incident thereon from a light source to laser light that has an NA and whose main optical axis is distributed on a conical surface that widens at a predetermined angle with respect to an incident optical axis of the laser light, and from which the laser light exits, and an optical device that has no refractive power and that deflects the laser light, which has exited the optical conversion unit, in a direction parallel to the incident optical axis, wherein the microscope illumination apparatus focuses laser light that has exited the optical device at a pupil position of a focusing lens for illuminating a specimen or a position that is conjugate with the position.

The invention relates to a coal and rock identification device based on the cutting of a drum shearer. The coal and rock identification device includes a protective sleeve, a mounting bracket, a water sprayer, an ultrasonic transducer, a laser transmitter, and a laser receiver. In the protective sleeve, the protective sleeve is installed on the shell of the rocker arm, and the water sprayer, ultrasonic transducer, laser transmitter and laser receiver are all installed on the mounting bracket. The beneficial effects of the present invention are: through the function of transmitting and receiving ultrasonic waves of the ultrasonic transducer, the water flow ejected from the sprinkler can be used as the coupling medium, the coal-rock interface can be identified according to the echo characteristics, and the laser and laser can be emitted by the laser transmitter. The receiver receives the laser and can identify the coal-rock interface according to the laser characteristics, so that the coal-rock interface identified by the echo characteristics can be compared with the coal-rock interface identified by the laser characteristics, and the coal-rock interface of the drum shearer can be improved. Recognition ability, in order to facilitate the cutting operation of the roller shearer.