245 results about "Far-infrared laser" patented technology

A method for doping semiconductors used for far infrared lasers with non-hydrogenic acceptors having binding energies larger than the energy of the laser photons. Doping of germanium or silicon crystals with beryllium, zinc or copper. A far infrared laser comprising germanium crystals doped with double or triple acceptor dopants permitting the doped laser to be tuned continuously from 1 to 4 terahertz and to operate in continuous mode. A method for operating semiconductor hole population inversion lasers with a closed cycle refrigerator.

A system remotely detects a gas leakage from a target in an area. The gas detection system includes two light sources: a mid-infrared (mid-IR) laser for detecting absorbance of the gas in the area, and a visible laser for detecting a pathlength of the mid-IR laser. The absorption is determined based on the relative amplitude difference of the emitted and reflected mid-IR light beams. The mid-IR laser may use wavelength modulation techniques to improve the absorption determination. The pathlength is determined by comparing a phase between the emitted visible light beam and the measured visible light beam. The gas detection system calculates a concentration of the gas in the area using the determined absorption and pathlength. The gas detection system may be attached to an unmanned aerial vehicle.

The invention discloses a construction method of an infrared laser in ultra quantum conversion limit based on optic superlattice. By utilizing the optic superlattice of the structure, the structure of the optic superlattice provides two reciprocal lattice vectors simultaneously, wherein one reciprocal lattice vector is used for compensating phase mismatch in an OPO (optical parametric oscillation) process from near infrared to intermediate infrared, and the other reciprocal lattice vector is used for compensating phase mismatch in a signal light pump OPA (optical parametric amplification) from the OPO process, in the process, the intermediate infrared laser which is generated in the OPO process can be amplified further, thus more efficient intermediate infrared laser output of the ultra quantum conversion limit is obtained; and a commensurability ratio double periodic structure is adopted for the optic superlattice, thus the more efficient intermediate infrared laser of the ultra quantum conversion limit is obtained.

The invention provides a vein viewing system. The vein viewing system comprises a control system (1), visible laser (2), near infrared laser (3), a MEMS (Micro Electro Mechanical System) scanning galvanometer system (4) and an infrared detector (5). Near infrared light is used for carrying out two-dimensional scanning by controlling the MEMS scanning galvanometer system (4); then by being input into the control system (1), an infrared scattered light signal measured by the infrared detector (5) is read into an image input buffering part of the control system (1); the image processing is carried out by an image processing part; a processed image is transmitted to a 2D (two-dimensional) imaging controller (10) to control the projection imaging of the visible laser; and a vein image with the ratio of 1:1 with a real object is projected onto a tested skin surface and the projection of the vein image is coincident with the actual position of the vein on the tested skin surface in the horizontal direction. By the vein viewing system provided by the invention, the accuracy that medical personnel positions the vein is greatly improved, the medical dispute caused by misoperation or repeated operation is reduced, the pain of a patient is reduced and the medical time is shortened.

The invention discloses a rotating mirror scanning dual waveband semiconductor laser sterilization system for a medical device, which comprises an infrared semiconductor laser, an ultraviolet semiconductor laser, optical fiber collimators, a zooming coupled lens assembly, an infrared beam scanning rotating mirror and an ultraviolet beam scanning rotating mirror. The system can be applied in various modes and occasions and can make important contribution to reduce a fatality rate and a disability rate and restore health as soon as possible in the field of medical treatment and intensive care infection prevention and treatment; the system achieves quick and thorough sterilization and has high efficiency by adopting an intense laser sterilization mode and integrating the advantages of a strong heating effect of an infrared laser and a strong protein molecular ionization damage effect of an ultraviolet laser; and the system is portable and reusable, is not contacted with a human body, has no obvious direct or indirect influence on the human body and is convenient to realize.

Laser devices are presented in which a graphene saturable absorber and an optical amplifier are disposed in a resonant optical cavity with an optical or electrical pump providing energy to the optical amplifier.

A traveling wave ring-resonator is configured to deliver CW single-longitudinal-mode radiation having a fundamental wavelength characteristic of an optically pumped gain-element in the resonator. The delivered fundamental-wavelength radiation is the output-radiation of the resonator. An optically nonlinear crystal is located in the resonator and arranged to convert a fraction of fundamental-wavelength radiation into second harmonic radiation. The conversion of this fraction of fundamental-wavelength radiation to second-harmonic radiation minimizes mode-hopping in the output radiation.

The infrared detecting and displaying two-purpose light emitting film consists of up converting light emitting material in 1-80 wt%, transparent organic medium in 10-95 wt% and additive in 0-60 wt%. It may have one adhesive layer on the surface and one flexible or rigid substrate. Under irradiation of infrared ray, the light emitting film emits bright visible light, so that the present invention may be used in anti-fake, display and infrared detection.

The invention discloses a medium wave infrared laser power stabilization system which mainly solves the problem that an existing system is not strong in stability and low in precision. The whole system comprises a medium wave infrared laser light source system (1), an infrared environment control chamber (2), an acoustic optical modulator (3), a spatial filter (4), a medium wave infrared thin film beam splitter (5), an optical chopper (6), a photoelectricity front-placing module (7), a feedback control module (8), an acoustic optical modulator driver (9) and a laser power detector (10). The medium wave infrared laser light source system outputs medium wave infrared lasers with power to be stabilized, and the infrared lasers pass through the acoustic optical modulator, the spacial filter, the medium wave infrared thin film beam splitter and the optical chopper and then irradiate a photoelectric detector to generate electric signals. The feedback control module processes the electric signals to obtain feedback information, and the acoustic optical modulator driver is controlled to adjust the acoustic optical modulator so as to stabilize the medium infrared laser power. The medium wave stimulate infrared laser power stabilization system has the advantages of being good in stability and high in precision and is suitable for stabilizing the medium wave infrared laser power with the wave band of 2.5 microns to 5 microns.

The invention provides a currency detector using a laser light source, which comprises a currency receiving plate, a cleaner starting tie-in, a starting sensor, a currency feeding plate, a power supply switch, one or more infrared laser, one or more visible light photosensitive element, a signal processing circuit and an executing device. The laser beam having a wavelength between 780 and 1500nm and emitted by the infrared laser is irradiated on the infrared up-conversion material false proof mark of the currency, the generated visible light is received by the photosensitive element, the light is amplified by a pre-amplifier and then the signal is operated and processed so as to identify the currency. The detector of the invention has high accuracy, simple circuit and structure, low cost and high detecting speed.

The invention provides an optical fiber gas cascaded Raman laser capable of realizing 3-5-micron band tuning. The laser comprises a 1-micron band tunable Raman pump source, a first level gas Raman laser generation device and a second level gas Raman laser generation device, the first level gas Raman laser generation device converts 1-micron pump laser generated by the 1-micron band tunable Raman pump source into first level Raman scattering laser, and the first level Raman scattering laser is laser of 1.5-micron band or 2-micron band; and the second level gas Raman laser generation device converts the first level Raman scattering laser into second level Raman scattering laser, and the second level Raman scattering laser is 3-5-micron band tunable mid-infrared laser. According to the optical fiber gas cascaded Raman laser provided by the invention, the output of 3-5-micron band tunable mid-infrared laser is realized in an anti-resonant hollow fiber with a negative curvature by employing a gas Raman cascading manner for the first time.

A high-power long-wave infrared 8 micron-12 micron laser device based on a polarization beam combination technology relates to the laser application technology field. A problem that output power of a 8 micron-12 micron laser acquired through an existing optical parametric oscillator (OPO) or optical parametric amplification (OPA) mode is limited by a crystal film damage threshold so that a single resonant cavity is difficult to acquire high output power is solved. Beam splitting is performed on a 2.1 micron pulse laser and then two ZnGeP2 optical parametric oscillators are pumped respectively so as to generate two beams of orthogonal polarization-state far-infrared lasers of 8 micron-12 micron so that pump light intensity borne by an upper end surface of a single ZnGeP2 crystal is greatly reduced. An optical parametric amplification technology is used to further amplify the 8 micron-12 micron laser and finally two beams of 8 micron-12 micron lasers which do not need polarization are combined into one beam of the 8 micron-12 micron laser with high power. The laser device of the invention is suitable for an occasion of laser acquisition.

Disclosed is an absorption mash gas detecting method for of portable infrared semi-conductor laser, which comprises: employing infrared laser of 1.33ª

A three-dimensional imaging of skin angiopathy and intelligent treatment system, belonging to technology field of medical equipment, comprising: optical fiber used to inject laser into skin tissue, optical fiber used to convey laser reflected or refracted by skin to optical flame detector, near infrared ray optical flame detector / charge-coupled device, Doppler / coherent signal processing system, computer real-time detection and control system working station, laser parameter controller and laser device. The laser device is infrared laser of 805 nm. The invention employs the selective absorption of infrared laser by indocyanine green, which biological tissue adsorbs little and realizes the selective damage to blood vessel. The wavelength of laser of 805-810 nm is much longer than that of currently use, which is 595 nm, so the penetration is deeper which treats deeper blood vessel better, choosing optimum laser parameter automatically by intelligent blood vessel skin damage treating probe, which avoids artificial error, improves treatment effect, reduce purpura and times of repeat treatment.

The invention provides a single crystal LiGa3Te5 which is in a non-centrosymmetric structure, belonging to a trigonal system; the space group is R32, and the cell parameters are as follows: alpha=beta=90 degrees, gamma=120 degrees, and Z=12; and the unit cell volume is expressed as follows: the diameter is 3-15mm, and the length is 20-40mm. The preparation method of the single crystal LiGa3Te5 comprises the steps of firstly preparing polycrystalline LiGa3Te5 and then growing the single crystal LiGa3Te5 by Bridgman method. The prepared single crystal LiGa3Te5 can be used for the physical performance test and the device research of crystals and is large enough; meanwhile, the single crystal LiGa3Te5 has a wide infrared transmission range and can realize mid and far infrared laser outputs by a nonlinear frequency transform technique so that the single crystal LiGa3Te5 can be applied to the manufacturing of nonlinear infrared optical devices as well as piezoelectric devices.

The invention relates to an ultrahigh-pressure water fog test system comprising a water fog box, a data acquisition and analysis control subsystem, a visible radiation detection unit, an infrared spectrum attenuation detection unit, an infrared thermal imaging detection unit, a 1.06-micrometer near-infrared laser attenuation detection unit, a 10.6-micrometer far-infrared laser attenuation detection unit, an air heating device, an air cooling device, a humidifying device, a dehumidifying device, an axial flow fan, an ultrahigh-pressure ultrahigh-rotate speed spinning nozzle, a temperature sensor, a pressure sensor, a humidity sensor, a wind speed sensor, a water fog concentration sensor and a particle size distributor. The system can simulate the atmospheric environment indexes, such as, atmospheric pressure, temperature, humidity, wind power, and the like in the water fog test box according to test requirements, carry out a shielding disturbance performance index test in the detection ways of visible light, laser, thermal imaging, infrared radiation and the like by aiming at ultrahigh-pressure water fog generated by an ultrahigh-pressure water-jet water fog cloaking generator and carry out analysis and evaluation.