32 results about "Liquid-crystal laser" patented technology

The patent refers to one or more droplets of chiral liquid crystals used as point source(s) of laser light. The source is shaped as a droplet of chiral liquid crystals (1) and an active medium preferably dispersed in the liquid crystals. The source is spherical and with a size of preferably between a few nanometres and 100 micrometres. A droplet consists of chiral liquid crystals (1) that have selective reflection in the range of the active medium's emission and can be cholesteric liquid crystals, a mixture of nematic liquid crystals and a chiral dopant or any other chiral liquid-crystal phase, preferably the blue phase, the ferroelectric phase, the antiferroelectric phase, any of the ferrielectric phases or another chiral phase of a soft substance, that need not be chiral by itself.

The present invention provides a tunable terahertz (THz) wavelength selector device, which includes a fixed phase retarder, a tunable phase retarder and a pair of linear polarizers to form a unit. The fixed phase retarder and tunable phase retarder basically utilizes liquid crystals to provide phase retardation, moreover, utilizing birefringence phenomenon possessed by liquid crystals can provide adequate phase retardation. The fixed phase retarder utilizes horizontal orientation of liquid crystal cell to provide fixed phase retardation, while the tunable phase retarder however utilizes homeotropic liquid crystal cell and a rotatable magnet to provide a tunable phase retardation, wherein the tunable phase retarder can provide the positive or negative phase retardation relative to the fixed phase retarder, based on the direction of the magnet's rotating axes and totally use the entire tunable range into adjusting frequencies which can pass through. Besides, the present invention can also serially connect multiple units described above so as to achieve a narrow enough band-pass bandwidth.

The invention discloses a preparation method of carbon black doped liquid crystal microcapsules, and belongs to the technical fields of fine chemical engineering and material science. The carbon blackdoped liquid crystal microcapsule is characterized in that a liquid crystal is doped with modified carbon black which exists in the microcapsules for absorbing transmitted visible light, so that thetransmitted light penetrating through the liquid crystal is reduced, human eyes mainly see selectively-reflected light of the liquid crystal, and liquid crystal microcapsules are more remarkable in color. The method is easy to operate, and is environmentally friendly. The liquid crystal microcapsules prepared by the method are remarkably improved in brightness, can present remarkable color under naked eyes, and can be widely applied in the fields of body temperature precise measurement, liquid crystal displays, electronic paper, liquid crystal lasers, anti-counterfeit packages and smart textile.

The invention discloses a liquid crystal laser display panel and a construction method thereof. The panel includes a periodically arranged RGB pixel array, the RGB pixel array includes a polymer micro-template and a liquid crystal microstructure; the polymer micro-template serves as a blank pixel, and the liquid crystal micro-structure is located inside the polymer micro-template ; Wherein, the liquid crystal microstructure includes liquid crystal material and organic laser dye molecules. The liquid crystal micro-laser pixel array has the characteristics of periodic arrangement, which is easy to realize color-mixed laser output, and easy to realize full-color laser display under a specific excitation mode.

The invention discloses an electric control liquid crystal laser shaping chip based on wave front adjustment. The chip comprises a cylindrical liquid crystal phase modification framework, wherein the liquid crystal phase modification framework comprises a liquid crystal material layer, a first liquid crystal initial alignment layer, an imaging electrode layer, a first substrate and a first antireflection film which are arranged on the upper surface of the liquid crystal material layer in sequence, and a second liquid crystal initial alignment layer, a common electrode layer, a second substrate and a second antireflection film which are arranged on the lower surface of the liquid crystal material layer in sequence; the common electrode layer is composed of a homogeneous conducting film; the imaging electrode layer is composed of a circular conducting film and at least one circular ring-shaped conducting film concentrically arranged on the periphery of the circular conducting film, and the circle center of the circular conducting film coincides with the axis of the liquid crystal phase modification framework; when a plurality of circular ring-shaped conducting films are arranged, the radial widths of all circular ring-shaped conducting films are equal, and the radial space of adjacent conducting films is equal. The chip is large in laser beam shaping variation range, good in adaptability and small in size and mass, and is easily coupled with other optical and optoelectronic mechanical structures.

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.

We describe a wide band variable transmission optical device having an electronically active cell comprising a guest-host mixture of a liquid crystal host and a dichroic guest dye material contained between a pair of plastic substrates. The liquid crystal host has an axis orientation that is alterable between a clear state orientation and a dark state orientation and the dichroic guest dye material includes one or more dichroic dyes. The optical device is characterized in that it exhibits a wide absorption band that is greater than 175 nm within a visible wavelength range of 400-700 nm, has a clear state transmission equal to or above 30% and a dark state transmission equal to or below 40%.

The invention relates to an optical path system for laser frequency stabilization and power stabilization of a SERF atomic gyroscope. The system includes two parts: a saturated absorption frequency stabilization system and a liquid crystal laser power stabilization and beam shaping system. The saturated absorption frequency stabilization system is used to stabilize the frequency of the pumped light of the SERF atomic gyroscope, and the liquid crystal laser power stabilization system is used to stabilize the power of the pumped light of the SERF atomic gyroscope. Shaping, so that it changes from a laser with Gaussian energy distribution to a flat-top laser with uniform energy distribution. The invention has reasonable optical path layout, compact structure, convenient installation and adjustment, and simple experimental operation, which provides a basis for the development of high-precision and miniaturized SERF atomic gyroscopes.

Provided is an optical surface profilometer. The optical surface profilometer includes a Fabry-Perot resonator into which liquid crystals are inserted, a light source which supplies coherent light to the Fabry-Perot resonator, and a convex lens which is disposed in an interference pattern emitting plane of the Fabry-Perot resonator, wherein the coherent light supplied from the light source is incident to the Fabry-Perot resonator, wherein, when the light is incident, the Fabry-Perot resonator emits an interference pattern generated in a resonance mode, and wherein the interference pattern is configured so that a number of circular fringes having the same center are disposed non-linearly. As a voltage is applied to the liquid crystal layer of the Fabry-Perot resonator, an effective refractive index is changed, so that a resonance mode condition of the Fabry-Perot resonator is changed. As a result, a diameter of the interference pattern is also changed. A 3D surface profile of the object is measured by measuring and analyzing the change of the interference patterns.

The invention discloses a blue phase liquid crystal film, and a preparation method and an application thereof. The blue phase liquid crystal film comprises the following components: 30 wt% of polymerizable liquid crystal monomer C6M, 59.5 wt% of liquid crystal molecules HTG135200-100, 2.9-3.7 wt% of a chiral dopant, 5 wt% of a crosslinking agent, 0.2-2 wt% of a photoinitiator, and 0.5-2 wt% of a small molecule dye. Since the blue phase state is affected by the polymerizable liquid crystal monomer C6M, the blue phase liquid crystal film prepared by adopting the preparation method is in a solidstate, and its morphology is relatively stable, so that the blue phase can be maintained in a very wide temperature range. Further, the influence of the thermal effect caused by the pump light on thetemperature of a liquid crystal laser device cannot affect the phase state of the blue phase liquid crystal, thus the wavelength stability of the laser device is greatly improved when the blue phase liquid crystal film is used as the laser device.