62results about How to "Guaranteed beam quality" patented technology

The invention relates to a light polarization compensation device for utilizing a beam shaping technology and a space beam combination system to convert incident laser into polarized laser to be output and belongs to the technical field of light polarization compensation. The device mainly comprises an input optical interface, a polarization beam splitter, a shaper, a first reflecting mirror, a spiral wave device, a second reflecting mirror and a space beam combiner. Against the polarization compensation problem of a laser, the light polarization compensation device aims to solve the problem of polarization instability and low extinction ratio of the laser, the lossless polarization compensation device based on the high-duty-cycle space beam combination system and the beam shaping technology is provided, and random laser is converted into high-extinction-ratio polarization laser to be output on the condition that the laser power level and beam quality are not affected. The light polarization compensation device is very small in power loss, the structure of the laser is not affected, and the cost and the complexity of the linear polarization laser can be effectively reduced; a control method for the light polarization compensation device is simple, a feedback and control system does not need to be arranged, and the light polarization compensation device is stable and reliable in performance.

A solid condition kHz pico-second laser burst regenerative amplifier belongs to a omni-solid condition regenerative amplifier, which is characterized in that: the two lumen mirror of the magnifying resonant cavity are consisted of an average lumen formed by a first omni-opposite lumen mirror (7) and a second omni-opposite lumen mirror (14), the inner of the resonant cavity is arranged with a minus lens (12) and a second lambada / 4wave plate (13) arranged between the laser crystal (9) which is a Nd:YAG bar and the second omni-opposite lumen mirror. The fast axis of the wave plate is parallel with the light vector of the inputting linearly-polarized light. The minus lens is arranged between the laser crystal and the second lambada / 4 wave plate or the second lambada / 4 wave plate and the second omni-opposite lumen mirror. The pump source is a continuously worked semiconductor laser diode array (10) and the working frequency is 1kHz. The laser crystal can also be a Nd:YLF bar, here the second lambada / 4 wave plate is needless. The invention reduces the volume and the costs of the system, effectively solves the problem of Nd:YAD regenerative amplifier domino offect, and effectively ensures the magnification and the beam quality.

The invention discloses a disc solid laser amplifier which comprises two parabolic reflectors, wherein the two parabolic reflectors are coaxially placed in a conjugate mode so as to form a parabolic reflector set; the vertex of each parabolic reflector is provided with a disc laser crystal; a certain inclined angle is respectively formed between the normal lines of end faces of two disc laser crystals and the centre shafts of the corresponding parabolic reflectors, and the two inclined angles are not equal; pump light and seed laser are parallel to an optical axis and enter in a condensing cavity formed by the two parabolic reflectors of the reflector set respectively from a pump light inlet and a laser inlet on the parabolic reflectors; and after being reflected many times in the condensing cavity, the pump light and the seed laser are alternately converged on the two disc laser crystals, thereby realizing the multiple pumping on the two disc laser crystals and the multiple amplification on the laser. By using the disc solid laser amplifier disclosed by the invention, the pump beam absorption efficiency is high, an effect of carrying out efficient amplification on the seed laser can be achieved, and better beam quality can be maintained; and meanwhile, the disc solid laser amplifier is simple in whole system structure, and easy to install and debug.

The invention discloses a high-power laser strip-type chip sintering clamp, and relates to the field of a semiconductor photoelectric technology. The high-power laser strip-type chip sintering clamp comprises a clamp base, a positioning plate, a probe positioning apparatus and spring probes, wherein a check block for limiting heat sink is arranged at one end of the clamp base while a positioning mechanism for positioning the heat sink is arranged at the other end of the clamp base; the positioning plate is perpendicularly mounted at the end of the clamp base through a fastener, wherein the heat sink check block is fixed at the end of the clamp base; a plurality of uniformly distributed through holes are formed in the probe positioning apparatus, wherein the through holes are adaptive with the spring probes; the spring probes are inserted in the positioning through holes respectively; the bottom ends of the spring probes are positioned above the heat sink and used for compressing to-be-sintered chips; and threads are further formed in the top parts of the positioning through holes, and the threads are matched with adjustable bolts for adjusting the magnitude of torsion of the spring probes. The clamp can apply different pressures on different parts of the high-power laser chip by the spring probes on the positioning plate so as to balance the stresses of the chip, correct smile bending degree and improve the optical beam quality of the chip.

The invention relates to the technical field of lasers, in particular to an optical fiber coupling semiconductor laser device. The optical fiber coupling semiconductor laser device comprises a coupling lens and a semiconductor laser device module capable of outputting a plurality of P light beams and at least one S light beam. The coupling lens is used for coupling the multiple P light beams and the at least one S light beam into a beam to form converged light. The number of the P light beams is larger than the number of the S light beams. In front of the coupling lens, each P light beam corresponds to a P light spot, and each S light beam corresponds to an S light spot. The multiple P light spots are sequentially arranged side by side, and the S light spots are sequentially arranged side by side. Each S light spot corresponds to the corresponding P light spot, each S light spot is coincident with the corresponding P light spot, and the P light spots corresponding to the S light spots are adjacent. The optical fiber coupling semiconductor laser device has the high transmittance and the high coupling efficiency of a space light beam combining mode, and has the high light beam quality of a polarization multiplexing mode.

The invention discloses a speckle removing device of laser display, and relates to the technical field of laser display. The device comprises laser sources and optical components, at least part of the optical components is placed in the light extraction directions of the laser sources, the optical components of transmission type are rotatable, and comprise uneven laser incidence planes respectively, and when the optical components rotate, laser beams emitted by the laser sources continuously pass the laser incidence planes. The rotary optical components are additionally arranged behind the laser sources to change the spatial coherence of laser, enable speckle to overlap continuously in the integration time, reduce the contact of speckles, and weaken the speckles. In addition, the laser sources are constant in the speckle removing process, so that the speckles can be effectively removed on the premise that the laser power and quality of laser beams are ensured, and the display quality is improved.

The invention provides a tapered semiconductor laser, which comprises a ridge region and a tapered region. The seed laser near the diffraction limit is generated in the ridge region, and the seed laser enters the cone region to amplify the output. The front cavity surface of the conical region, that is, the cavity surface of one end connected with the ridge region, has no feedback laser, and the conical region unidirectionally amplifies the seed laser. The scheme can realize the unidirectional amplification of laser beam, the front cavity surface without feedback structure makes the beam quality not easy to deteriorate in the amplification process, can greatly increase the length of the conical region, can not only output high power, but also maintain the beam quality near the diffractionlimit, can achieve ultra-high brightness laser output.

The invention provides a quantum cascading laser device. The quantum cascading laser device includes stepped heat sinks, single-tube quantum cascading laser devices, aspherical lenses and reflecting mirrors, wherein a plurality of step planes are formed on the wall surface of each stepped heat sink, the single-tube quantum cascading laser devices are fixed on the step planes of the stepped heat sinks, the aspherical lenses are fixed on the step planes of the stepped heat sinks and located at the front ends of the single-tube quantum cascading laser devices, and the reflecting mirrors are fixed on the step planes of the stepped heat sinks and located at the front ends of the aspherical lenses. The quantum cascading laser device solves the heat dissipation problem of current quantum cascading laser devices, an external-cavity spectral beam combining mode is adopted to ensure the quality of laser beams, so that a feasible high-efficiency beam combining method of the quantum cascading laser device is provided.

A multi-waveguide integrated resonance semiconductor laser belongs to the technical field of semiconductor laser chips, solves the problem that a conventional laser is poor in mode characteristics, unstable in work, large in divergence angle, poor in light beam quality and low in brightness, and improves output power of semiconductor laser. A photon bridge, mode stabilizers and a power amplifier are arranged on a semiconductor laser chip, wherein the photon bridge is connected with the power amplifier through one or more same or different mode stabilizer arrays, so that laser is transmitted and resonated between mode stabilizers and the power amplifier on the semiconductor laser chip along the photon bridge. The mode stabilizers stabilize optical modes, or generate a seed light source of high beam quality with stable work mode and single optical mode, and the power amplifier amplifies the power of the seed light source. The multi-waveguide integrated resonance semiconductor laser realizes single tube or linear array output of semiconductor laser with high power, high brightness and narrow linewidth, and obtains single tube or linear array output of multi-wavelength semiconductor laser.

The invention discloses a signal-pump beam combiner capable of keeping high beam quality and aims at solving the problem that an existing signal-pump beam combiner is difficult to keep high beam quality while achieving extra-large mode field output. The signal-pump beam combiner comprises a signal fiber, a signal transition fiber, pump fibers, a low-refractive index glass tube and an output fiber,wherein the signal fiber is welded with the signal transition fiber; N pump fibers surround the periphery of the signal transition fiber and pass through a taper in the middle of the low-refractive index glass tube to form a molten fiber bundle; the molten fiber bundle is welded with the output fiber; and the output fiber also passes through the taper. The signal-pump beam combiner is capable ofreducing the through put loss of signal light and keeping high coupling efficiency of pump light, thereby keeping high beam quality when the signal light reaches the signal transition fiber (a relatively large mode field) from the signal fiber (a small mode field) and then reaches the output fiber (an extra-large mode field).

The invention discloses a multi-layer blue light semiconductor laser spectrum beam combining device, which belongs to the technical field of blue light semiconductor laser, and comprises a light beam compression element, a slow axis collimating mirror group, a light beam deflection element, a diffraction grating, a reflector and an output coupling mirror which are sequentially arranged along a light path direction, wherein the light beam compression element comprises a plurality of layers of prisms which are vertically stacked; the number of layers of the prisms is the same as the number of layers of blue light to be combined, and each layer of blue light enters the corresponding layer of prism; blue light of each layer of a first type is transmitted through the light beam compression element, and the distance between blue light beams in blue light of each layer of a second type is compressed, so that aberration of blue light rays far away from an optical axis and feedback crosstalk between the light beams are reduced, and other elements can allow more blue light beams to pass through on the premise of the same size; therefore, the number of the blue light beams used for spectrum beam combination is increased, and the output power of the blue light laser can be greatly improved on the premise that the light beam quality is guaranteed with a small size.

The invention discloses a distributed feedback injection amplifying semiconductor laser, consisting of a main laser, a first light isolator, a taper laser amplifier, a second light isolator, a tiny light exploring laser power stabilization system and a laser shaping system, wherein, the main laser adopts a distributed feedback semiconductor laser tube, the collimated laser beam is injected into a taper laser amplifying chip passing through the first light isolator, the amplified laser adopts the beam splitting technique passing through the second light isolator, an electrophotonic detector detects the fluctuation of power of the amplified laser, the error signal is sent to a current control interface of the taper laser amplifier through a feedback circuit, the power stability of the laser is outputted after the error signal is amplified by a reverse feedback mechanism, the light outputs the collimated Gaussian beam through the laser shaping system. The distributed feedback injection amplifying semiconductor laser has compact structure, convenient adjustment, wide and narrow laser rays, high power, good stability and strong practicability.

The invention relates to a method and apparatus for preparing black silica by adopting lattice scanning. The method includes the following steps that: 1, a silicon wafer is arranged in a doped material-containing sample chamber; 2, a single laser beam of a pulse laser passes through a diaphragm, a reflector, a half wave plate, a polarizer, a shutter, a beam expanding mirror, a focusing lens, a Dammann grating and the like, so that lattice laser can be obtained; 3, the lattice laser irradiates on the surface of the silicon wafer, and a computer controls the opening and closing of the shutter and the movement of a three-dimensional translational platform, and therefore, lattice scanning can be realized, and a black silica material of which the surface is of a micro pointed cone structure can be obtained. According to the method and apparatus of the invention, the Dammam grating is adopted, and the single beam laser can be converted into two-dimensional and equal-light intensity array beams; when the Dammam grating splits the laser beam, the influence of chromatic dispersion in the light splitting process of an ordinary semi-transmittance and semi-reflection mirror can be avoided, and the quality of the split light beams can be ensured; and point-by-point scanning adopted for preparing the black silica is converted into lattice scanning, and therefore, the preparation efficiency of the black silica can be greatly improved.

The invention discloses an improved Z-scanning apparatus, wherein different to-be-measured samples are pre-scanned so as to automatically determine the optimum measurement light intensity corresponding to the to-be-measured samples; at the optimum measurement light intensity, the following problems are effectively avoided: 1) influence of high-order non-linear optics effect due to excessive lightintensity; and 2) influence caused by excessive noise signals due to weakness of the light intensity; therefore, the measurement result is accurate and reliable. In the apparatus, a plurality of reflectors and aperture diaphragms are arranged for shaping the beam. In the apparatus, corresponding devices are added to measure influences, caused by laser energy fluctuation, instable laser mold locking and sample breaking, during the measurement; and corresponding devices are added to avoid influence of thermal effects and polarization state during the measurement. On the mentioned basis, the incident light source is replaceable, the polarization state is adjustable, and closed pore and opened core data can be measured at the same time.

The invention discloses a semiconductor end-pumped high-power single-mode air cooling laser. A first pump source LD and a first coupled focusing system as well as a second pump source LD and a second coupled focusing system are connected by optical fibers; lasers output by the first coupled focusing system and the second coupled focusing system respectively enter into a gain medium; a first catadioptric lens and a second catadioptric lens are respectively arranged between the first coupled focusing system and the gain medium as well as between the second coupled focusing system and the gain medium; a reflection light path of the first catadioptric lens is provided with a thermal lens compensation totally reflecting mirror; a reflection light path of the second catadioptric lens is provided with a Q-switch and a totally reflecting mirror; and a first temperature control device and a second temperature control device are arranged at the outer side of the gain medium and respectively used for controlling the temperatures of all surfaces which are vertical to an a-axis of the gain medium as well as all surfaces which are vertical to a c-axis of the gain medium. The laser of the invention has high power, high efficiency and excellent quality of effluent light beams.

The multi-waveguide integrated resonant semiconductor laser belongs to the field of semiconductor laser chip technology. output power. The present invention makes photon bridge, mode stabilizer and power amplifier on the semiconductor laser chip; The bridge transmits and resonates between each mode stabilizer and the power amplifier; the mode stabilizer stabilizes the optical mode, or generates a high beam quality seed light source with stable working mode and single optical mode; the power amplifier amplifies the power of the seed light source. The invention realizes high-power, high-brightness and narrow-line width semiconductor laser single tube or line array output, and can also obtain multi-wavelength semiconductor laser single tube or line array output.

A multi-wavelength incoherent spectrum beam-combining lath laser oscillator comprises a high-reflection cavity mirror array (1), a lath laser gain module (2), an optical conversion system (3), a diffraction optical element (4) and an output coupling mirror (5), which are sequentially arranged along an optical path. The laser oscillator provided by the invention adopts the solid lath laser gain module to generate a plurality of beams of split-aperture, multi-wavelength and narrow-linewidth laser, and performs external cavity spectrum beam combination of the plurality of beams of laser, so thatgain amplification and incoherent spectrum synthesis of light beams can be realized at the same time. Compared with a spectrum beam combining and amplifying device, the laser oscillator provided by the invention has the advantages that on the one hand, a seed laser source is not needed and the structure is simple; on the other hand, the multiple beams of multi-wavelength laser respectively oscillate in a plurality of independent laser resonant cavities formed by the high-reflection cavity mirror array and the output coupling mirror, the laser beam quality after spectrum beam combination is basically consistent with the beam quality of the single beam of sub-laser, and the high beam quality can be maintained while the power is improved.

The invention discloses a laser energy amplifier which comprises a signal laser seed source, an optical fiber laser amplification module, a first signal laser wavelength reflector, a second signal laser wavelength reflector and a solid laser amplification module. The signal laser seed source is used for outputting signal laser; the fiber laser amplification module amplifies and outputs weak signallaser output by the signal laser seed source, and comprises an all-fiber structure signal amplification module or a free space signal amplification module; and the first signal laser wavelength reflector and the second signal laser wavelength reflector transmit laser beams output by the fiber laser amplification module to the solid laser amplification module. The solid laser amplification modulecarries out secondary amplification on the input laser and then outputs the laser. The solid laser amplification module comprises a solid lath crystal semiconductor pump laser amplification module ora solid round bar crystal pulse xenon lamp pump laser amplification module. The multi-stage laser energy amplifying device is arranged, different stages can be combined and expanded according to needs, and weak signals can be subjected to laser amplification.

The invention discloses a high-power all-fiber laser based on a multi-core fiber. The laser comprises a seed source, a pumping source, a pumping beam gathering device, an end cap and a multi-core fiber. The multi-core fiber comprises a wrapping layer whose two ends are stripped and multiple fiber cores. Ends of the fiber cores are mutually welded so that one single fiber core is formed. The part outside the wrapping layer of the single fiber core is provided with an input end and an output end. The input end is welded to the seed source and the output end is welded to the end cap. The wrapping layer is welded to the output end of the pumping beam gathering device. The laser performs multipass amplification on laser signals; pumping coupling absorption efficiency is high; stability and reliability of the laser system are high; and compared with the prior art, while a certain factor of the multi-core fiber is ensured, the multi-core fiber has a quite big wrapping layer diameter. Thus, while the pumping laser has certain brightness, quite high-power pumping coupling is achieved.

The invention pertains to the technical field of laser, in particular to a method for improving the quality of light pulse and light beam of amplified signals output from an optical parametric amplifier. In the process of optical parametric amplification (OPA) or optical parametric chirped pulse amplification (OPCPA), the method utilizes an OPA device to improve the quality of the light pulse and the light beam of the amplified signals through controlling phase shifts of signal light in the pump light direction. The method avoids influences of spatial walk-off and group velocity mismatch, relaxes requirements on the quality of pump light, and improves the quality of the light pulse and the light beam of the amplified signals; thereby the method is suitable for a high-energy OPA device or a high-energy OPCPA device.

The invention belongs to the technical field of short-pulse laser and particularly relates to a laser capable of directly generating two paths of coherent light. An existing multi-beam laser photoetching device has the defects of excessive devices, low light energy utilization rate, non-uniform interference fringe light intensity distribution and the like. The invention provides the laser capableof directly generating two paths of coherent light. The laser comprises a first laser oscillation assembly, an electro-optic Q-switching assembly and a second laser oscillation assembly which are arranged in sequence, the first laser oscillation assembly comprises a first Dammann transmission grating, a first laser crystal excitation component and a first Dammann reflection grating which are arranged in sequence; the second laser oscillation assembly comprises a second Dammann reflection grating, a second laser crystal excitation component and a second Dammann transmission grating; the first laser crystal excitation component comprises a first pump light source and a first laser crystal, and the second laser crystal excitation component comprises a second pump light source and a second laser crystal. The double-path light interference effect is good, the working efficiency is high, and the reliability is high.

The invention relates to a mixed chamber mode locking laser oscillator and a laser outputting method thereof. Laser crystal is arranged between a recessed cylindrical surface reflection mirror and a protruding cylindrical surface reflection mirror. A panel reflection mirror receives light scattered by the laser crystal. A semiconductor saturation adsorption mirror receives light of the panel reflection mirror. A matching lens is arranged between the semiconductor saturation adsorption mirror and the panel reflection mirror. Pump light forms light spots, penetrates through the recessed cylindrical surface reflection mirror and is output from one side of the protruding cylindrical surface reflection mirror. The invention also comprises a laser outputting method. The method comprises steps of during chamber adjusting, shielding the semiconductor saturation adsorption mirror, wherein a second non-steady chamber is in the stable state and the laser output is output from the protruding cylindrical reflection mirror. According to the invention, a non-steady chamber structure is used in the horizontal direction where the light beam quality is output by approximating the diffraction limit; a steady chamber structure is still used in the vertical direction; mode field area in the chamber is increased; the light strength in the chamber under the power level is reduced; and on the precise that the light beam quality is kept, quite high output power is generated.

The invention discloses an active cooling type one-dimensional wave surface correction device which comprises a base, an actuator and a lens. A cooling cavity is formed in the top of the base, a water inlet is formed in one end of the cooling cavity, and a water outlet is formed in the other end of the cooling cavity. A through hole is formed in the bottom of the cooling cavity, and the actuator is arranged on the base and adheres to the lens through the through hole in the bottom of the cooling cavity, wherein the cooling cavity is covered with the lens. A cooling material flows in through a water mouth at the bottom of a cooling plate and flows from a water mouth in the top, the cooling material in the cooling cavity fully conducts heat exchange with the lens, so that active cooling is achieved. When weave surface fluctuation in the length direction of a strip-shaped light spot is found through Hartmann detection, a corresponding current or voltage is loaded on the corresponding actuator through a connector, the actuator drives a lens face to vertically move, and the lens face is deformed, so that one-dimensional correction of the weave face shape is achieve.

The invention discloses a high-power fiber laser prostate therapy system. The high-power fiber laser prostate therapy system comprises a laser resonant cavity, a pumping source, a gain fiber, an electro-optical Q-switch device and an optical fiber coupling lens; the gain fiber comprises gain fiber cores, an air wedge, and an inner wrapping layer, an outer wrapping layer and a strengthened coat layer which coat the fiber cores and air wedge in sequence from the inside to the outside, the number of the gain fiber cores is larger than 1, the gain fiber cores are parallel to the central axial line of the gain fiber, the air wedge uses a thin strip-shaped hollow structure, and one end of the air wedge is located at the circle center of the inner wrapping layer while the other end is located at the edge of the inner wrapping layer. The high-power fiber laser prostate therapy system uses the special multi-core gain fiber structure, the fiber cores are symmetrically distributed in a non-rotating mode, the special air wedge design breaks the circular symmetry of the optical fiber, the power limit of the single-fiber core fiber laser is overcame, the pumping efficiency of the laser is increased, and the output power of the laser is greatly improved.

The invention relates to a resonant cavity for a frequency-selecting 355nm ultraviolet laser in an optical fiber end surface pumping Brewster angle cavity. A front reflective mirror, a YVO4 crystal, an acousto-optic Q switch and a turning mirror are sequentially arranged along the 808nm pumping laser emergent direction; the 808nm pumping laser enters via the front reflective mirror and excites the YVO4 crystal so as to generate 1064nm laser; the 1064nm laser enters the turning mirror, and is refracted and reflected outside by the turning mirror; a three-frequency-multiplication LBO crystal is arranged in front of the emergent direction of the 1064nm laser which is refracted and reflected outside by the turning mirror; the 1064nm laser refracted and reflected by the turning mirror is refracted by the three-frequency-multiplication LBO crystal and then exits; and a two-frequency-multiplication LBO crystal and a rear reflective mirror are sequentially arranged in front of the exit direction of the 1064nm laser refracted by the three-frequency-multiplication LBO crystal. The resonant cavity is ingenious in structure and reasonable in design, the balance between the high output power and high light beam quality can be reached perfectly, and the laser output power and optical quality can be stabilized.

The invention discloses a multi-layer blue-light semiconductor laser spectral beam combining device, which belongs to the technical field of blue-light semiconductor lasers, and comprises: a beam compression element, a slow-axis collimating mirror group, a beam deflection element, a diffraction grating, and a reflection mirror and an output coupling mirror; wherein, the beam compression element includes vertically stacked multilayer prisms; the number of layers of the prisms is the same as that of the blue light to be combined, and each layer of blue light is respectively incident on a corresponding layer of prisms; through beam compression The element transmits the first type of blue light in each layer, and at the same time compresses the distance between the blue light beams in the second type of blue light in each layer, while reducing the aberration of the blue light away from the optical axis and the feedback crosstalk between the beams. Under the premise of the same size, other components can allow more blue light beams to pass through, thereby increasing the number of blue light beams used for spectral combining, and can greatly increase the output of blue light lasers with a smaller volume while ensuring the beam quality power.

The invention provides a 266nm solid-state laser and a beam quality optimization method thereof, wherein the 266nm solid-state laser includes a first frequency doubling structure and a second frequency doubling structure; After the first frequency doubling structure, it is used to receive the 532nm laser beam formed by the first frequency doubling structure and convert it into a 266nm high-power ultraviolet laser beam; wherein, the second frequency doubling structure includes a quadruple frequency doubling crystal component, and the quadruple frequency doubling crystal The component is composed of a combination of the first BBO crystal, CLBO crystal and the second BBO crystal arranged in sequence along the laser exit optical path, and is used for frequency doubling conversion of the 532nm laser beam exiting along the laser exit optical path to obtain 266nm high-power ultraviolet Laser beam. Therefore, based on the 266nm solid-state laser of the present invention, under the condition that the 266nm laser power output is guaranteed, two nonlinear crystal cascading methods of BBO crystal and CLBO crystal are used to improve the output beam quality and prolong the service life of the crystal at the same time and reduced laser cost.

The invention provides a collimator and a laser. The collimator comprises an optical fiber assembly, an end cap and an output lens, wherein the optical fiber assembly comprises a fiber core and a cladding assembly, the fiber core is located in the cladding assembly, the outer surface of the cladding assembly is provided with a functional ring groove, the functional ring groove extends in the circumferential direction of the fiber core, the end of the fiber core is in butt joint with a first end of the end cap, and the output lens and a second end of the end cap are arranged oppositely. By forming the functional ring groove in the cladding assembly in the circumferential direction, light of L1, L2, L3 and L4 in the prior art is filtered to the outside by the functional ring groove, a main signal laser is still transmitted and output along the fiber core to ensure insertion loss, isolation, beam quality and other performance parameters, and the laser does not use a separately set power stripper any more, thereby saving arrangement space and reducing cost.

The invention discloses an improved Z-scanning apparatus, wherein different to-be-measured samples are pre-scanned so as to automatically determine the optimum measurement light intensity corresponding to the to-be-measured samples; at the optimum measurement light intensity, the following problems are effectively avoided: 1) influence of high-order non-linear optics effect due to excessive lightintensity; and 2) influence caused by excessive noise signals due to weakness of the light intensity; therefore, the measurement result is accurate and reliable. In the apparatus, a plurality of reflectors and aperture diaphragms are arranged for shaping the beam. In the apparatus, corresponding devices are added to measure influences, caused by laser energy fluctuation, instable laser mold locking and sample breaking, during the measurement; and corresponding devices are added to avoid influence of thermal effects and polarization state during the measurement. On the mentioned basis, the incident light source is replaceable, the polarization state is adjustable, and closed pore and opened core data can be measured at the same time.

The present invention relates to the technical field of laser application and in particular to a laser collimation structure and a product using the same. The laser collimation structure comprises anoptical amplifier and a beam splitter. The optical amplifier has an output end and an input end. The light output from the output end of the optical amplifier is transmitted and then is projected ontothe beam splitter. The light projected onto the beam splitter is at least partially reflected and transmitted, then, as input light, reenters the optical amplifier from the input end of the optical amplifier, and is copied and amplified. The light that is projected onto the beam splitter and is not reflected by the beam splitter is transmitted by the beam splitter to be collimated, and then is output and applied. By setting a condition of passing the light beam output by the optical amplifier through an external specific collimation and clustering path as an essential condition of laser resonance, laser collimation and clustering are achieved. The laser light generates an extremely small spot after irradiating an object and is linearly polarized light in a determined direction. A productusing the laser collimation structure is one of a laser cutting machine, a laser engraving machine, a laser scanner, and a nuclear fusion reaction ignition device.