39results about How to "Increase laser intensity" patented technology

The present passively Q-switched laser comprises a condensing optical system for condensing a laser beam emitted from a laser light source onto the surface of the solid-state laser medium. The surface of a solid-state laser medium is disposed off the condensation position of the laser beam produced by the condensing optical system.

A method for extending and enhancing bright coherent high-order harmonic generation into the VUV-EUV-X-ray regions of the spectrum involves a way of accomplishing phase matching or effective phase matching of extreme upconversion of laser light at high conversion efficiency, approaching 10−3 in some spectral regions, and at significantly higher photon energies in a waveguide geometry, in a self-guiding geometry, a gas cell, or a loosely focusing geometry, containing nonlinear medium. The extension and enhancement of the coherent VUV, EUV, X-ray emission to high photon energies relies on using VUV-UV-VIS lasers of shorter wavelength. This leads to enhancement of macroscopic phase matching parameters due to stronger contribution of linear and nonlinear dispersion of both atoms and ions, combined with a strong microscopic single-atom yield.

A method for extending and enhancing bright coherent high-order harmonic generation into the VUV-EUV-X-ray regions of the spectrum involves a way of accomplishing phase matching or effective phase matching of extreme upconversion of laser light at high conversion efficiency, approaching 10−3 in some spectral regions, and at significantly higher photon energies in a waveguide geometry, in a self-guiding geometry, a gas cell, or a loosely focusing geometry, containing nonlinear medium. The extension and enhancement of the coherent VUV, EUV, X-ray emission to high photon energies relies on using VUV-UV-VIS lasers of shorter wavelength. This leads to enhancement of macroscopic phase matching parameters due to stronger contribution of linear and nonlinear dispersion of both atoms and ions, combined with a strong microscopic single-atom yield.

Method and apparatus for generating an at least two-dimensional image of at least part of a sample. The method involves scanning the sample. Acquiring at least one light signal by an optoelectronic detector for different areas of the sample. Converting the light signal into an electrical signal. Distributing the electrical signal onto several parallel evaluation channels whose signal evaluations differ from each other so that their dynamic ranges are different. Generating a result signal in each evaluation channel. Selecting at least one of the result signals as a function of one of the result signals in order to generate the image for the sample range concerned. It is also possible to generate one intermediate result signal for each channel, typically from the respective actual result signal and one or more other sources. Thus the signal selection depending on both the result signals and the intermediate result signals are possible.

An antenna system that generates radiation similar to that generated by a relativistic charged particle is provided. The antenna system includes a conducting wire carrying a current pulse with a net charge, called a quasi charged particle, which propagates near the speed of light and emits radiation. Preferably, the quasi charged particle is generated by using a pulsed laser to knock out electrons from the conducting wire. While propagating on the conducting wire near the speed of light, the quasi charged particle generates a synchrotron like radiation from a bent of the wire, an undulator like radiation from a sinusoidal or helical structure of the wire, a diffraction like radiation from an aperture transmitting the wire, a Smith-Purcell like radiation from a corrugated grating surface next to the wire, and a greatly wavelength-contracted undulator like radiation from an undulator with the wire aligned along the undulator axis.

The present invention discloses a zinc oxide transparent electrode-based opposed-contact photoconductive switch. The zinc oxide transparent electrode-based opposed-contact photoconductive switch includes a vanadium-doped silicon carbide substrate (1), an upper ohmic contact electrode (2), a lower ohmic contact electrode (3), an upper thin film electrode (4) and a lower thin film electrode (5); the upper ohmic contact electrode (2) and the lower ohmic contact electrode (3) are respectively deposited on the front surface and back surface of the vanadium-doped silicon carbide substrate (1); the upper thin film electrode (4) is deposited on the front surface of the vanadium-doped silicon carbide substrate (1) and the surface of the upper ohmic contact (2); the lower thin film electrode (5) is deposited on the back surface of the vanadium-doped silicon carbide substrate (1) and the surface of the lower ohmic contact electrode (3); the upper thin film electrode and the lower thin film electrode are both made of a transparent zinc oxide material; and therefore, the photoconductive switch can be turned on when the surfaces of the electrodes are under illumination, and the light receiving area of the device is increased, the photon concentration and laser energy utilization rate of a conductive channel can be improved. The photoconductive switch can be used for a high-speed pulse system.

The invention belongs to the technical field of optical lasers, and specifically relates to a liquid crystal photonic crystal fiber random laser and a manufacturing method therefor. The invention provides the liquid crystal fiber laser with a function of controlling the random laser emitting direction. According to the invention, the aqueous solution of cholesteric liquid crystal which is doped with a laser dye and mixed with polyvinyl alcohol is injected into a photonic crystal fiber, and the liquid crystal laser which can control the random laser emitting direction can be constructed through the light transmission characteristics of the photonic crystal fiber. Therefore, the conventional random laser emitting direction can be controlled, thereby improving the laser intensity of the photonic crystal fiber to a great extent.