46results about How to "High damage resistance threshold" patented technology

The invention belongs to the technical field of film electric field distribution design, and in particular relates to an oblique incidence high-reflection film laser electric field distribution design method. The invention provides a high-reflection film laser electric field distribution design method which comprises the following steps: pre-setting the extinction coefficient of a film material, optimizing the absorption rate of a high-reflection film system structure through values, and controlling the absorption rate to be minimum, thereby distributing a laser electric field, and finally preventing a film boundary from intensity electric field distribution. By adopting the scheme, a high-reflection film laser electric field distribution design in oblique incidence can be achieved; by adjusting the electric field distribution of laser, the film boundary is prevented from an intensive electric field, the absorption rate can be controlled to be minimal, the anti-damage threshold of laser can be increased, and the absorption loss can be reduced.

The invention relates to a fiber laser adopting an end face coated cavity mirror. The fiber laser is characterized by comprising the coated cavity mirror, a pumping device and a doped fiber serving as a gain medium, wherein the coated cavity mirror is a fiber end face thin film with a certain optical characteristic which is formed by coating a film on the end face of a small section of fiber; andthe small section of fiber is a section of gain fiber or a section of undoped fiber which has the same parameter as the gain fiber. The end face coating film is adopted by the fiber laser as a cavitymirror, so that the service life and the damage threshold of the cavity mirror are improved; and consequently, the cavity mirror cannot be ablated or damaged when working at a higher power.

The invention relates to a high-power laser multipath optical fiber sampling time waveform measuring device which is characterized by comprising a high-speed digital oscilloscope and a high-power laser to be measured; a first photoelectric detector is connected with the first input end of the high-speed digital oscilloscope through a first cable to form an external trigger circuit; multiple pathsof sampling optical paths are arranged at plurality of points to be measured of the high-power laser to be measured; each path of sampling optical path comprises a sampling mirror, an optical attenuator, a coupling device and a sampling optical fiber which are sequentially connected; and the sampling optical fibers of the multiple paths of sampling optical paths are connected with the input end of an optical fiber combiner, the output end of the optical fiber combiner is connected with a second photoelectric detector, and the output end of the second photoelectric detector is connected with the second input end of the high-speed digital oscilloscope through a second cable. The invention has the advantages of small volume, strong anti-interference capability, adjustable length, flexible light beam guidance, convenient integrated control and the like.

The invention relates to a preparation method of gray track resistance KTiOPO (GTR-KTP) crystals. The method comprises the following steps: firstly preparing a KH2PO4 crystal material, and then carrying out sectional heating to form an even and stable high-temperature solution under a super environment; adopting a method of combining the top end with lifting to grow the GTR-KTP crystals. According to the KTP crystals prepared by the preparation method, an absorption coefficient of the KTP crystals is reduced; a gray track can be effectively prevented, so that the frequency doubling conversion efficiency of the KTP crystals is obviously enhanced; the GTR-KTP crystals are irradiated by a 100mw and 532nm of green light within 1000 seconds in a test; absorption of the system is basically kept stable; a good gray track resistant effect is displayed.

The invention discloses a laser array light source based on liquid crystal geometric phase modulation. Based on the geometric phase modulation principle of liquid crystal molecules, a geometric phasearray grating is designed by controlling the arrangement direction of a main shaft of the liquid crystal molecules. The grating is insensitive to the polarization state of an incident light beam, and0-pi binary geometric phase modulation can be introduced to a fundamental mode Gaussian beam in any polarization state, so that the fundamental mode Gaussian beam is converted into a high-dimensionallaser beam array. According to the laser array light source, optical elements such as the geometric phase array grating are integrally fixed through the metal sleeve, the overall structure is compact,and good stability is achieved. The light source is reliable in structure and easy to control, can serve as a novel array structure light source to be widely applied to the frontier application fields of laser array radars, face recognition, multi-point machining, microimaging and the like, and has great progress compared with the prior art.

The application belongs to the technical field of fiber lasers, and in particular relates to a composite thin film, a preparation method thereof, and a self-starting mode-locked fiber laser device. Because the gain fiber doped with rare earth atoms is expensive, the cost of the fiber laser is also very high. At the same time, the long gain fiber will lead to extremely obvious Kelly sidebands of the mode-locked pulse, which will eventually cause the interaction between soliton pulses, resulting in The timing jitter of pulses aggravates the bit error rate of long-distance communication, which is not conducive to the improvement of communication quality. The application provides a composite film, which is composed of the following raw materials in parts by weight: 3-11 parts of polyvinylpyrrolidone, 16-24 parts of ethylene glycol, 76-84 parts of sodium hydroxide, 2-2 parts of bismuth chloride 10 parts, 1 to 9 parts of antimony chloride and 11 to 19 parts of sodium tellurite. It has weak Kelly sidebands, high damage resistance threshold, can realize self-starting mode locking, easy to operate, narrow pulse, and good stability.

The invention relates to a hydrogen fluoride laser wavelength selective output folded unstable cavity. The resonant cavity includes a convex reflector, a 45-degree polarized reflector, a 45-degree total reflector and a concave reflector. Among them, the reflective surfaces of the convex reflector and the concave reflector are respectively coated with a reflective film with high transmission of short wavelength light and high reflection of long wavelength light. Reflective film with high reflection of wavelength light. The selective output of laser light with different wavelengths is realized by utilizing the different reflectivity of the optical elements in the cavity to the oscillating light of different wavelengths in the cavity. By setting the position of the optical element in the cavity, the beam rotation of the resonant light in the cavity along the airflow direction is respectively realized, and the spatial distribution uniformity of the output light spot is improved. The resonant cavity has a simple structure and can realize uniform output of a hydrogen fluoride laser single spectral line.

The invention discloses a laser capable of outputting a single longitudinal mode laser beam, and a light output control method thereof, having strong anti-interference ability and high energy output stability of the system and without affecting the single longitudinal mode effect by the aging of the pump xenon lamp. The laser is sequentially provided with a total reflection mirror, a small aperture diaphragm, a Q-switching component, a polarizing plate, a first quarter-wave wave plate, a laser gain medium, a second quarter-wave plate, and an output mode selection component along the laser transmission direction; and the Q-switching component is any of a passive Q-switching crystal, a pressurized photoelectric Q-switch with an optical feedback control circuit, and a de-voltage photoelectricQ-switch with an optical feedback control circuit. In the invention, the single longitudinal mode laser energy output by the xenon lamp pump laser is nearly 100 times higher than that of the semiconductor pump, the energy amplification is easier with a strong technical advantage; the selected mode output component may be used to drastically reduce the number of longitudinal modes in the resonantcavity, and the number of longitudinal modes falling within the fluorescence line of the gain medium is less, thereby facilitating the formation of a single longitudinal mode.

The invention relates to a laser damage resistant solid-state laser resonator, comprising a first total reflection prism (1), a laser gain medium (2), a coupling output prism (3), and a second total reflection prism (4). In order to solve the problem that the reliability of laser is not high due to the damage of optical element film, The invention adopts all optical elements which are not coated as resonant cavity elements, realizes high transmission, high reflection and specific proportion transmission of laser light through special design material and incident angle, thereby realizing oscillation output of laser light, so that laser damage threshold of laser light can be greatly increased, and laser reliability can be further improved.