7 results about "Optical limiter" patented technology

The invention relates to the technical field of optical imaging systems, in particular to an optical imaging system capable of continuously resisting blinding caused by pulse laser damage. The system comprises a secondary imaging optical system, an imaging detector, a nonlinear absorption type optical limiter and a two-dimensional moving unit, the secondary imaging optical system comprises a primary imaging optical assembly and a secondary imaging optical assembly; after entering the secondary imaging optical system, the light beam is focused by the primary imaging optical assembly to form a primary image plane focus, and then is imaged on the imaging detector through the secondary imaging optical assembly; the nonlinear absorption type optical limiter is mounted on the two-dimensional moving unit and is arranged near a primary image plane position of a primary optical axis of the secondary imaging optical system; the two-dimensional moving unit drives the non-linear absorption type optical limiter to move, so that an incident light beam passes through different positions on the non-linear absorption type optical limiter. The device has the advantages that continuous laser protection is carried out on an imaging detector, and automatic protection of an optical imaging system is achieved.

The utility model discloses an optical limiting device based on gallium nitride nanowires and a nonlinear light absorption testing device. The optical limiting device comprises a light-transmitting container used for storing high-concentration gallium nitride nanowire dispersion liquid. Another optical limiting device comprises a light-transmitting substrate, an anhydrous gallium nitride nanowire layer is arranged on the surface of the light-transmitting substrate, a light-transmitting cover piece covers the anhydrous gallium nitride nanowire layer, and a sealing edge surrounds the edge of the anhydrous gallium nitride nanowire layer and is located between the light-transmitting cover piece and the light-transmitting substrate. The nonlinear light absorption testing device comprises a pulse laser, a diaphragm, a laser attenuation device, a beam splitter, a focusing lens, a first laser energy meter, a second laser energy meter, a collection lens and a light limiter. According to the utility model, the gallium nitride nanowire is used as an optical amplitude limiting material, broadband optical amplitude limiting of ultraviolet-visible-near infrared bands can be realized, and the problems of low light intensity transmittance and high light intensity transmittance of the existing ultraviolet light amplitude limiting material are solved.

One aspect relates to an optical limiter (200) for limiting the radiation flux of a light source beam, the optical limiter comprising: an optical control port (221) irradiated by an optical control beam originating from a source beam; an optical input port (221) irradiated by an optical transmission beam originating from the source beam; an optical output port (225) irradiated by the transmission beam; and a thermally driven optical windmill (211, 212); wherein the optical windmill is arranged relative to the input port, the control port and the output port such that: illumination of the control beam on the control port drives the optical windmill to rotate only when the control beam has a radiation flux equal to or exceeding a predetermined radiation flux threshold; and the rotation of the optical windmill causes the area of ​​the output port irradiated by the transmission beam to change.

This invention relates to the field of optical imaging system technology, and more particularly to an optical imaging system for continuous protection against pulsed laser-induced blindness. The system includes a secondary imaging optical system, an imaging detector, a nonlinear absorption-type optical limiter, and a two-dimensional moving unit. The secondary imaging optical system comprises a primary imaging optical component and a secondary imaging optical component. After the light beam enters the secondary imaging optical system, it is focused by the primary imaging optical component to form a primary image focal point, and then imaged onto the imaging detector by the secondary imaging optical component. The nonlinear absorption-type optical limiter is mounted on the two-dimensional moving unit and positioned near the primary image plane of the secondary imaging optical system's principal optical axis. The two-dimensional moving unit drives the movement of the nonlinear absorption-type optical limiter, allowing the incident light beam to pass through different positions on the nonlinear absorption-type optical limiter. The advantage is that it provides continuous laser protection for the imaging detector, achieving automatic protection for the optical imaging system.

The utility model relates to the field of non-linear optics, and particularly provides an in-situ electrochemical Z scanning spectrum system which comprises a laser and a light detector which are arranged at the same height, a focusing lens is arranged between the laser and the light detector, a sample moving mechanism is further arranged between the focusing lens and the light detector, the focusing lens is a plano-convex lens, and the sample moving mechanism is arranged between the plano-convex lens and the light detector. One side of the plane faces the sample moving mechanism, the focus of the focusing lens is located at the light height position corresponding to the length center position of the sample moving mechanism, the power-up mechanism is fixedly arranged on the sample moving mechanism, and a to-be-tested sample is arranged on the side, close to the focusing lens, of the power-up mechanism. According to the power-up mechanism, the nonlinear optical characteristics of the sample are changed by applying voltage, and in-situ detection of the electrically-controlled nonlinear optical response of the material is achieved. The dynamic behavior of the material under the action of an electric field can be researched, important support is provided for developing tunable optical devices such as electro-optical modulators and dynamic optical limiters, and application and development of photoelectric functional materials are promoted.

A system comprises a light source, a scanner, an optical limiter, and a receiver sensor. The light source is configured to emit an output beam comprising pulses of light. The scanner is configured to scan the output beam across a field of regard of the system. The optical limiter is configured to non-linearly affect a received light based on an intensity of the received light. The receiver sensor is configured to detect at least a portion of the received light exiting the optical limiter, the detected light comprising at least a portion of one of the emitted pulses of light scattered by an object located a distance from the system.