44 results about "Laser medicine" patented technology

Tissue is treated by irradiating it with a sequence of optical pulses that are directed in sequence to various sites on the tissue. During the irradiation sequence, one or more tissue properties are measured at a site(s) that has already been irradiated. These measurements are used to adjust the parameters of subsequent optical pulses in the sequence.

The invention provides a double-resonance, wide-tuning and narrow-linewidth all-solid-state nanosecond pulse medium-infrared optical parameter oscillator comprising four parts including single-frequency pump light, a double-resonance resonant cavity, an electrical control part and seed light. A 1.064 <mu>m single-frequency pulse laser pump quasi-phase matching multi-cycle polarized crystal double-resonance parameter oscillator is adopted to acquire dual-band laser output of wide-tuning range near-infrared signal light and medium-infrared idle light. The output central wavelength is tunable within the wide spectral range, and the cavity length is dynamically adjusted through electro-optical crystal by combining a single-frequency continuous semiconductor laser seed injection technology so as to realize narrow-linewidth laser output of the optical parameter oscillator. The oscillator can be widely applied to the field of high-resolution laser spectroscopy, laser radar, laser remote sensing, environmental detection, optical-electro countermeasure and laser medicine.

The invention relates to a dual-wavelength laser based on dual-simulated Raman scattering media. The dual-wavelength laser comprises a pumped source, a first diaphragm, a beam compressing system, a second diaphragm and a first attenuation system which are successively arranged along an optical path. The dual-wavelength laser further comprises a Raman medium I, a Raman medium II and a first filtering sheet which are different in Raman displacement. A pumped laser or frequency-converted light thereof is split and then is emitted to the simulated Raman scattering media arranged in parallel or is emitted to the serially-arranged simulated Raman scattering media in sequence, so that a dual-wavelength laser is output. A plurality of selections are available to the pumped light of the Raman media, the Raman media can be freely selected and combined, and a plurality of kinds of dual-wavelength lasers can be obtained. The dual-wavelength laser is simple in structure, high in stability and large in output energy, so that the dual-wavelength laser has a great application value in the fields of laser range finding, laser communication, difference absorption laser radars, laser medicine, fine laser spectrums, terahertz wave generation by a difference frequency method and the like.

The invention relates to a solid laser with adjustable pulse width from a hundred picoseconds to a nanosecond and solves problems of complicated structure and high cost of a narrow-pulse-width large-energy laser structure obtained by means of a mode-locking technique in combination with amplification technology. Linear polarized light generated by a seed light laser successively passes an isolator, a shaper 1, a polarization device 1, an amplifier 1, and a polarization device 2 and then enters a SBS pulse compressor. Light returned from the SBS pulse compressor successively passes the polarization device 2, the amplifier 1, the polarization device 1, the shaper 2 and the amplifier 2 and then exits from amplifier 2. The solid laser is simple in structure, lower in cost compared with a product in the prior art, large in output energy, good in the quality of output light beams, and suitable for the fields of laser medicine, nonlinear optics, precision machining and laser communication.

The invention discloses a multi-purpose high-power semiconductor laser therapeutic apparatus which comprises a main control module, a cooling control device, a display control device, a switching control device, a power supply clutter filter, an AC-DC (Alternating Current-Direct Current) power supply module, a multi-phase constant current control module and a multi-wavelength high-power semiconductor laser, wherein the multi-wavelength high-power semiconductor laser comprises an optical element device, an optical fiber connector and at least two bar array sets of different wavelengths; and the operating state of an electrode of each bar array set is controlled by the main control module, laser beams on the bar array sets are shaped, polarized, focused and collimated to be coupled to the central axis of the optical fiber connector, and the laser beams of multiple wavelengths can be output by the optical fiber connector at different times or at the same time. The apparatus provided by the invention can output laser beams of multiple wavelengths, solves the technical problem on how to output laser beams of multiple wavelengths by means of a single optical fiber connector on a semiconductor laser, meets the requirements for the clinical application of the laser medicine and truly achieves multiple purposes.

The invention discloses a laser facility of all-solid-state five-wavelength lasers simultaneous output and a laser production method. The five-wavelength lasers, that is, infrared of 1.3 mum wavelength, infrared of 1.0 mum wavelength, green light of 0.5 mum wavelength, yellow light of 0.5 mum wavelength and red light of 0.6 mum wavelength, are simultaneously output using a Nd<3+>-doped laser crystal as working substance and a composite resonator of + shape by combining nonlinear optics frequency translation technology with acousto-optically Q-switched technology as well as controlling the polarization direction of fundamental frequency lasers with different wavelengths by a polarization beam splitter. The fundamental frequency lasers with different wavelengths and polarization directions respectively form oscillation in each relatively independent resonant cavity and each beam of light can be adjusted independently. The laser facility has advantages of multiple wavelengths, high efficiency, compact structure, low running cost, convenient and flexible adjustment and safe work, and is widely used in the field of laser medicine, laser color display, laser entertainment, astronomy, national defense and scientific research.

The invention discloses a scanning galvanometer system and relates to a scanning galvanometer assembly used for a laser medicine operation or a laser cosmetic surgery, and aims to provide the scanning galvanometer system which is simple in structure, convenient for assembly, and high in precision. The scanning galvanometer system comprises a bracket, a focus fixing frame, an X-scanning motor, a Y-scanning motor, a 45-degree reflector, and a light inlet sleeve, wherein an X-scanning motor hole and a light inlet sleeve hole are formed in the upper end of the bracket, a Y-scanning motor hole is formed in the right end of the bracket, a focus fixing frame hole is formed in the lower end of the bracket, the X-scanning motor, the Y-scanning motor, the focus fixing frame and the light inlet sleeve are respectively correspondingly mounted in corresponding bracket holes, the X-scanning motor comprises an X-lens, the X-lens is fixedly connected with a shaft of the X-scanning motor, the Y-scanning motor comprises a Y-lens, the Y-lens is fixedly connected with a shaft of the Y-scanning motor, and two mounting modes of the reflector are provided.

The invention discloses a growing method of a magnesium aluminate spinel crystal doped with transition metal ions. The molecular formula of the crystal can be expressed as TM2xMgAl2(1-x)O4 and Tm'yMg1-yAl2O4 (TM=Ti<3+>, Cr<3+>, Fe<3+> and Ni<3+>; TM'=Mn<2+>, V<2+> and Co<2+>, 0<x<1, and 0<y<1). The growing method is characterized in that MgAl2O4 polycrystalline raw materials synthesized with the flame method and transition metal oxides prepared according to the proportional concentration are placed in an iridium crucible and sufficiently heated to be molten, the magnesium aluminate spinel crystal or the doped magnesium aluminate spinel crystal is adopted as a seed crystal, and crystal growth is conducted with the Czochralski method. According to the method, the crystal with the large size and high quality can be obtained and be expected to be applied to the fields of micromachining, laser medicine, laser chemistry, laser printing, military application, underwater communication and axis isotope separation.

The invention provides a self-injection structure for realizing isotropic medium output linearly polarized single-frequency laser and relates to the self-injection structure of a laser, in particular to a Tm<3+>:YAG (yttrium aluminum garnet) laser which performs end-pumped single-frequency self-injection. 785nm light enters a crystal from an end surface; end pumping is performed; a single longitudinal mode is selected by combining an F-P etalon with a volume grating, wherein the volume grating serves as an output cavity lens; after the light enters a light splitter, the generated laser enters a 1/2 wave plate and a Glan prism to form linearly polarized light; and a small part of light is reflected by a full-reflecting lens through a partial through lens, so that the linearly polarized light is re-injected into the crystal to be continuously oscillated to form a structure of a self-injection linearly polarized single-frequency laser. Due to the design of the whole machine, linearly polarized output in an isotropic crystal is realized by a self-injection method, and the linearly polarized and stable single-frequency laser with high power is obtained. The method is complete and accurate, and is applied to injection frequency locking technology study of a single Tm-doped isotropic medium including Tm<3+>:YAG. The application field includes the fields of optoelectronic countermeasure, laser radar, laser medicine and the like.

The invention discloses a double-cavity interconnection V shape structure single-direction overlapping output quasi-cw green light laser which uses two semiconductor laser pumped components with same type pump two Nd:YAG crystals from side surface (semiconductor laser pumped Nd:YAG mode). Two modes are set in a plane concave V shape resonant cavity and a plane concave straight cavity, and form two beam 1064nm basic frequency lights with stabile operation, generate two beam frequency doubled lasers via acousto-optic Q switch and frequency doubled crystal, and reach plane folding mirror, single-direction overlapping output via plane folding mirror, and gain 532nm green light with average power as high as 206W. The laser has stable property, high frequency doubled efficiency, and is wide used in laser material processing, light storage, laser full-color display, laser medicine, scientific research, communication, national defence and amusement etc.

A semiconductor laser system for laser medical cosmetology, comprising a semiconductor laser array (1), an optical waveguide (2), a boss-shaped transparent contact window (3) located at the light outlet end of the optical waveguide (2), and a refrigeration block (4) for conduction cooling of the contact window (3); the refrigeration block (4) consists of a base portion and a hollow head above the base portion; the front part of the hollow head presses against and is tightly fastened to the whole side wall of the contact window (3); the light outlet end of the optical waveguide (2) is located in the cavity of the hollow head, and has a gap between the waveguide and the inner wall of the hollow head; a thermoelectric semiconductor refrigerator (5) is disposed below the base portion of the refrigeration block (4); a first water supply block (6) is disposed below the thermoelectric semiconductor refrigerator (5); and a second water supply block (16) for heat dissipation is installed in the semiconductor laser array (1). The system employs a unique refrigeration structure design so as to cause the temperature of the face of the working end in direct contact with skin to approach the freezing point, and the structure is compact and stable.

A full solid state electro-optic modulation Q green laser adopts a V-shaped folding cavity. An optical coupled system, a plano-concave front cavity mirror, a laser crystal, a polarizer, a 1/4 wave plate, an electro-optic modulation Q crystal and a negative meniscus shaped refrative mirror are sequentially arranged along the direction of advance of the laser output by a laser diode. The reflected light path of the negative meniscus shaped refrative mirror is sequentially provided with a frequency doubling crystal and a plano-concave rear cavity mirror. The laser has the advantages of compact structure, high output pulse repetition rate, narrow pulse width, high beam quality, and the like, and can be widely applied to the fields such as laser material processing, laser color display, laser medicine, military confrontation, undersea detection, etc.

The invention discloses a Yb<3+> activated boron tungstate up-conversion luminescent material and a preparation method thereof. Molecular formula of the luminescent material is expressed as R1-xYbxBWO6, wherein R represents one of La<3+>, Pr<3+> and Nd<3+>, X represents a mol percent of doped Yb<3+>, and x is not greater than 0.5 and greater than 0.0001. The preparation method adopts a solid-phase synthesis or chemical synthesis process, and is simple in preparation process; the up-conversion luminescent material is synthesized in the air without production of a reducing atmosphere, so that demand on the equipment is comparatively low and production cost is reduced. The prepared up-conversion luminescent material is stable in performance, and has advantages of high color purity, high brightness and the like; the up-conversion luminescent material, excited by a 975nm infrared laser, can realize up-conversion luminescence of blue and green; and the up-conversion luminescent material has application prospects in the fields of printing anti-counterfeiting, 3-dimensional display, laser medicine, high-density data storage, etc.

The invention relates to a portable glaucoma rapid-screening analyzer which is characterized by mainly comprising an industrial computer, an LED brightness control device, a view field stimulation screen, a camera monitoring device, a responder and a printer, wherein the industrial computer is respectively connected with the LED brightness control device, the camera monitoring device, the responder and the printer; and the LED brightness control device is sequentially connected with a light-splitting device and the view field stimulation screen. The invention carries out static visual field examination in four specific positions of eyeballs in the way of four-point visual field examination, that is to say, the invention carries out threshold estimation and view field screening on four points by statically showing cursors with different brightness, thereby achieving the purpose of early treatment and diagnosis of glaucoma; in addition, the invention has the advantages of high accuracy, easy and convenient operation, short examination time consumption, high reliability and portability, is beneficial to the view field general survey of national people and the integral development of the ophthalmology field of national laser medicine and enhances the national visual field defect detection level.

The invention discloses an efficient intermediate infrared laser crystal Er, Pr: YSAG as well as a preparation method thereof and a method for realizing intermediate infrared laser output. The methodtakes a scandium-contained garnet crystal material yttrium aluminium scandium garnet single crystal with high symmetry as a substrate, Er<3+> is taken as an active ion, and Pr<3+> ion is doped into the crystal, so that particle number of energy level <4>I<13/2> under laser at a wave band of 2.6-3.0 mum of Er<3+> ion is effectively evacuated, fluorescent lifetime of the energy level is shortened, alaser threshold value is reduced, laser output efficiency and laser output power are improved. A semiconductor laser unit is adopted for pumping crystal, so that laser output at a wave band of 2.6-3.0 mum is realized, and important application prospect in the fields such as laser medicine, scientific research and military science is realized. At present, an InGaAs LD laser unit is adopted as a pumping source for pumping Er, Pr:YSAG crystal, so that double-wave-length intermediate infrared laser output with wavelength being 2.694 mum and 2.825 mum is realized.

The invention relates to a coaxial output multi-wavelength laser device. The laser device acquires multi-wavelength laser output with high repeated frequency, good beam quality, compact structure, andstable performance by using the slab laser technology and the optical parametric amplification technology, thereby guaranteeing a system in the whole pumping power range to work in a stable area; andthe output energy and stability of the laser is improved to a large extent. The high-energy and high-repeated frequency laser output is realized by using the orthogonal pumping technology, the wavelength locking and slab technology. The high-energy coaxial multi-wavelength laser output is obtained by using the pressurization Q-switching technology and pre-bias technology. The laser can be used asthe ideal laser source of the laser medicine, laser radar, photoelectric countermeasure and like fields due to the advantages of being multiple in output band, uniform in facula, and high in output energy; the laser device has the prominent advantages of being compact in structure, high in conversion efficiency and high in beam quality, and is extremely bright in application prospect.

The invention relates to the fields of dental medicine and laser medicine, and in particular relates to a laser treatment and microbiological damage killing comprehensive treatment method with visibleguidance in a periodontal pocket. The method mainly comprises the following steps: S1, uniformly pouring a methylene blue plaque coloring agent into the periodontal pocket by adopting a pouring device, and carrying out static waiting for 1-3 min after pouring; and S2, carrying out irradiation on a marked part of the coloring agent by adopting a laser beam of laser with the wavelength being 635-655 nm and a laser beam of laser with the wavelength being 9300nm. In the method provided by the invention, the technology of matching visible guidance with the laser with the wavelength being 9300nm inthe periodontal pocket is a breakthrough, the laser with the wavelength of 9300nm has good absorption and heat effects for the hard tissue, and also has a good effect for the soft tissue, so that themethod provided by the invention can achieve a relatively high absorption level for the periodontal part and the soft and hard tissue of the teeth, treatment and cure are then carried out, and due tothe irradiation treatment, the lesion tissue can be subjected to gasifying ablation, excision and hemostasis.

The invention belongs to the field of laser medicine, and particularly relates to a device and method for welding biological tissue through double-beam laser. Comprising a first laser, a second laser, a walking mechanism, an imaging system, a temperature detection system, a workbench and a controller. A biological tissue to be welded is placed on the workbench, the power of the second laser is larger than that of the first laser, the walking mechanism controls the first laser and the second laser to move according to a control instruction of the controller, and the temperature detection system is used for monitoring the temperature of the biological tissue to be welded in real time and transmitting a signal to the controller. The imaging system is used for obtaining a three-dimensional image of the surface of the welded biological tissue and transmitting the image to the controller, and the controller controls the walking mechanism and the laser device according to the temperature and the three-dimensional image. According to the invention, the most suitable laser parameters can be freely combined according to different tissues of different parts of organisms, and low-damage and high-performance skin tissue laser welding is realized.