8 results about "Microchip laser" patented technology

This invention discloses a driving circuit for a microchip laser, comprising: an analog switch circuit controlling the opening and closing of a constant current discharge circuit according to an externally input control signal; the constant current discharge circuit, after being controlled by the analog switch circuit to open, outputting a discharge signal to a voltage converter circuit and outputting electrical energy input from a capacitor energy storage circuit to the outside; the voltage converter circuit increasing the voltage input range, performing voltage conversion on the discharge signal, and outputting the voltage-converted discharge signal to an error amplifier charging current-limiting circuit; the error amplifier charging current-limiting circuit detecting the magnitude of the internal current of the driving circuit and limiting the current, and outputting the current-limited discharge signal to the capacitor energy storage circuit; and the capacitor energy storage circuit storing electrical energy and outputting electrical energy to the constant current discharge circuit according to the current-limited discharge signal. This invention features high charging efficiency, a wide input voltage range, low equivalent resistance of the energy storage capacitor, small size, good adaptability to high and low temperature environments, and no significant reduction in capacity at low temperatures.

The present application relates to a rotational speed detection device based on self-feedback rotating Doppler effect. Its main components include microchip laser, lens, light splitting prism, photodetector, acousto-optic frequency shifter, polarizer, quarter wave plate, vortex plate. The laser generated by the microchip laser is expanded by the lens and then split into two beams by the light splitting prism. The reflected beam irradiates on the photodetector, and the transmitted beam is frequency shifted twice by the acousto-optic frequency shifter to generate a frequency shift Δf smaller than the relaxation oscillation frequency of the microchip laser. Then, the polarization state of the beam is controlled by the polarizer and the quarter wave plate, and then transmitted through the vortex plate to become vortex light. After passing through another linear polarizer, the polarization state of the vortex beam can be further modulated. Finally, the vortex light irradiates on the surface of the rotating object to generate a rotating Doppler shift f mod , and the scattered light returns to the microchip laser cavity again. After amplification in the laser cavity, the photodetector can detect the size of the rotating Doppler shift, thereby realizing the measurement of the rotational motion information of the target. The device has the outstanding advantages of compact structure and high sensitivity.

The subject-matter of this disclosure is a method for singulating microchips. The method includes providing a single-layer or multi-layer substrate. The method further includes laser-based creating microcracks in the substrate using a laser beam that penetrates the substrate, wherein the laser beam is guided laterally around the microchips so as to generate singulating scribe lines in the substrate along which the microchips are to be singulated. The laser beam is guided laterally across the substrate in multiple passes, wherein the focal point of the laser beam is set to different penetration depths in different passes each so that the microcracks generated in the focal point are generated in the substrate in a step-wise manner. According to the disclosure, at least one recess is generated in the substrate, wherein the recess extends at least partially in a lateral direction along one of the singulating scribe lines.

The invention relates to the technical field of laser mass transfer, in particular to a microchip laser mass transfer method, device and equipment and a storage medium, and the method comprises the steps: firstly obtaining a morphology data set of an acceptor substrate, constructing a morphology digital map based on the morphology data set, and constructing a process parameter query table based on the morphology digital map; then acquiring a plurality of chip sub-region images of the donor substrate and a plurality of welding plate sub-region images of the acceptor substrate, and performing visual fine alignment processing on each chip sub-region image and each welding plate sub-region image to obtain a plurality of plane position offsets; the method comprises the following steps of: firstly, performing instruction generation processing on the basis of a process parameter lookup table and a plurality of plane position offsets to obtain an execution instruction set corresponding to each chip sub-region image, and finally, finishing laser mass transfer of all chip sub-region images on the basis of a plurality of execution instruction sets, so as to solve the transfer defect caused by non-uniform morphology and improve the transfer efficiency. The mass transfer yield of microchips is improved, the manufacturing cost is reduced, and the mass production process is accelerated.

A frequency modulated, continuous wave (FMCW) laser using a microchip gain medium, an optical coupling element, and a tuning element is described. The laser may be part of a coherent laser ranging system.

The utility model provides a three-wavelength microchip laser. The three-wavelength microchip laser comprises a semiconductor diode, a first lens, a second laser output mirror group, a first reflecting mirror, a second lens, a first frequency doubling crystal, a second frequency doubling crystal, a first light-emitting mirror group, a second light-emitting mirror group and a third light-emitting mirror group which are arranged in sequence. According to the three-wavelength microchip laser, on the premise that the size of the microchip laser is not increased, high-efficiency polarized 1064nm-wavelength subnanosecond laser output is achieved, three-wavelength lasers are output at the same time through the frequency tripling module, the three-wavelength microchip laser can effectively simplify a light path, the structure is simple, the installation space is greatly reduced, and the cost is reduced. And the miniaturized use requirement of the laser can be met.

1. The name of the design product: microchip laser. 2. The use of the design product: for generating laser output, which can be widely used in optical sensing, precision measurement, laser indication, micro-optoelectronic instruments, portable detection equipment and scientific research, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The present invention relates to an optically pumped microchip laser comprising: a pump lens; a gain element, wherein the gain element comprises a first end facet and a second end facet, wherein the gain element comprises a gain section, and wherein the gain section during operation of the microchip laser generates electromagnetic laser radiation; an output coupling reflective structure on the first end facet, wherein the output coupling reflective structure has a first reflectivity for the laser radiation; and a semiconductor saturable absorber mirror at the second end facet, wherein the semiconductor saturable absorber mirror comprises a saturable absorber section and a mirror section, and wherein the mirror section has a second reflectivity for the laser radiation, wherein the second reflectivity is larger than the first reflectivity; wherein the pump lens is arranged and positioned such that during operation of the microchip laser electromagnetic pump radiation is focused by the pump lens through the output coupling reflective structure into the gain element. According to the present invention the pump lens is a cylindrical Gradient Index lens comprising a cylinder axis, a first end surface and a second end surface, wherein the Gradient Index lens is arranged and positioned such that during operation of the microchip laser the pump radiation exits the Gradient Index lens through the second end surface, wherein the second end surface forms an angle with the cylinder axis different from 90 degrees, and wherein the gain element and the Gradient Index lens are positioned relative to each other such that the laser radiation exiting the gain element through the output coupling reflective structure is reflected at the second end surface such that the laser radiation bypasses the gain element.