3 results about "Optical rectification" patented technology

To improve the conversion efficiency of an optical rectenna as a photoelectric conversion device, and thereby enhance overall power generation efficiency.SOLUTION: The photoelectric conversion device includes an emitter electrode that receives incident light and emits electrons, an anode electrode that absorbs electrons, an insulator that supports the emitter electrode and the anode electrode, and a fixed charge portion that generates an electric field to provide a potential that causes electrons to fly out from the emitter electrode toward the anode electrode.SELECTED DRAWING: Figure 3

This invention relates to a method for generating terahertz radiation and a terahertz radiation source. In the method according to the invention, a pump beam (14) emitted from a pump beam source is incident on a block of a semiconductor nonlinear optical medium (10) having a planar parallel front boundary surface and a rear boundary surface (11, 12), wherein the pump beam (14) is decomposed into a set of sub-pump beams upon refraction on a periodic structure (13) formed by pairs of planar surfaces in the front boundary surface of the block. The sub-pump beams travel in angular directions required to satisfy velocity matching conditions. The envelope of the pump pulse leading edge segment propagating in the sub-pump beam segment propagates in a direction perpendicular to the rear boundary surface (12) (i.e., the exit surface of the optical medium (10)) at the propagation speed of terahertz radiation, and generates terahertz radiation in the semiconductor optical medium (10) by means of optical rectification to satisfy the velocity matching condition; here, is the group velocity of the pump beam (14), is the phase velocity of the generated terahertz radiation, and y is the angle between the envelope of the pulse leading edge of the pump beam (14) and the phase leading edge.

The invention relates to the technical field of optical fairings, and discloses a hyper-hemispherical fairing with a groove and a machining process thereof.The hyper-hemispherical fairing comprises a fairing body, the first groove is formed in the surface of the fairing body and is an arc-shaped hollow groove body, and the fairing body is made of quartz glass or polycarbonate materials with high light transmittance and high stability; according to the fairing, the first groove, the second groove and the third groove in different shapes are formed in the surface of the fairing body according to external conditions, and when the external weather is rainy and snowy, rain and snow fall to make contact with the surface of the fairing body; the fairing main body with the first groove, the second groove and the third groove can better guide rainwater, snow and the like to naturally fall into the first groove, the second groove and the third groove below the fairing main body, so that accumulated water or accumulated snow is prevented from being formed on the surface of the fairing main body; therefore, the influence of the factors on the sunlight detection of the sunlight intensity meter is effectively reduced.