6 results about "Liquid crystal spatial light modulator" patented technology

Disclosed in this disclosure is a method for super-resolution microscopic interferometric measurement based on broadband annular radially polarized light, where a broad-spectrum light source with an extended surface is selected; uniform illumination covering a to-be-tested FOV and having a certain aperture angle is provided using a Kohler illumination system; a two-stage relay system is designed, and amplitude and polarization of a full-FOV beam is modulated by a liquid crystal spatial light modulator and a vortex waveplate; broadband annular radially polarized light is focused based on the extended surface light source and a microscopic objective lens with a high numerical aperture to implement super-resolution microscopic interference imaging of a sample; and super-resolution topography measurement directed at a surface of a microstructure is implemented combined with phase-shifting interferometry.

The application relates to a low-dielectric-constant-material slotting system and method based on a spatial light modulator, which comprises a laser, a liquid crystal spatial light modulator, an optical path transmission system and a workbench; the laser is used for emitting a laser beam; the optical path transmission system transmits a main machining light beam to the liquid crystal spatial light modulator for shaping, outputs and focuses the shaped laser beam on the surface of a machined material on the workbench, sequentially forms double-fine-line light spots and multiple strip light spots to successively machine the surface of the machined material, and the energy and the focal plane position are both in a stepped distribution, so that grooves are finally formed on the surface of the machined material. The double-fine-line grooves formed by double-fine-line light spots can effectively isolate the thermal influence of subsequent multiple strip light spot etching, ensure the slotting precision, the spatial light modulator has high diffraction efficiency, greatly improves the energy utilization rate, and the spatial light modulator is flexible in modulation and can flexibly switch the double-fine-line and multiple strip light spots and the width and quantity of the multiple strip light spots according to different requirements.

The application discloses a system and method for generating stable interference fringes by using a pure phase reflective liquid crystal spatial light modulator, and the system comprises a light source module, a laser collimation filtering and beam expanding module, a pure phase reflective liquid crystal spatial light modulator (SLM) control module and a CCD image acquisition module. The system can generate stable double-hole light spots by loading a gray-scale gradual phase grating on the SLM, replaces the method for generating double-hole light spots by using a photoetching mask in a traditional physical optical interference experiment, and can achieve the final result without the aid of other devices, and is simple and convenient to operate. In addition, compared with traditional interference systems such as a Talbot-Green system and a Mach-Zehnder system, the output interference fringes will not vibrate, and the calculation of the post-stripe movement amount is not affected, and the system has the characteristics of stable operation, flexible control and accurate calculation.

The application discloses a free-form surface adaptive measurement device and method based on Fourier spot analysis, in particular to a free-form surface adaptive zero-position interferometer device for large surface shape deviation, and belongs to the field of optical detection. The device comprises a light source system, an adaptive compensation system, an interference system and a surface to be measured. The liquid crystal spatial light modulator is used for guiding aberration compensation of the adaptive element through analysis of Fourier transform spots of the system, and the dependence on an interference pattern is broken, so that the measurement range of the traditional adaptive interferometer is greatly expanded, and destructive modification of a traditional interferometer light path is not needed.

This invention belongs to the field of flat-top beam shaping technology and discloses a flat-top beam shaping method based on the last-place elimination GSGA algorithm. The fundamental mode beam output from a semiconductor laser is connected to a phase-type liquid crystal spatial light modulator (LCSSM) via an optical signal input interface. A computer is connected to the LCSSM via USB and HDMI interfaces. The computer transmits phase distribution information to the modulator via the USB interface, and the modulator feeds back the shaped flat-top beam amplitude distribution to the computer via the HDMI interface. The LCSSM outputs the shaped flat-top beam spatial light through an optical output coupler. In this invention, the computer uses a novel algorithm to calculate the phase distribution and shapes the input Gaussian beam using the LCSSM, resulting in a flat-top beam with high energy utilization and high top uniformity.

The invention relates to a wide-angle oblique incidence-oriented near-to-eye display system and a hologram generation method, and the method comprises the steps: obtaining the initial phase distribution of a reflection-type silicon-based liquid crystal spatial light modulator plane, and enabling the initial phase distribution to have a physical resolution; a virtual oversampling grid is constructed, the initial phase distribution is mapped to an expanded high-resolution grid, and the sampling interval of the expanded high-resolution grid is smaller than the physical sampling interval; constructing a modulation light field on the expanded high-resolution grid, and superposing a linear phase term corresponding to oblique incidence; carrying out propagation calculation on the modulated light field by adopting a Shifted angular spectrum method to obtain high-resolution light field distribution of a target plane; the high-resolution light field distribution of the target plane is mapped back to the physical resolution through average downsampling, a reconstructed image is obtained, and the method has the advantages that on the premise that high quality is kept, the calculation efficiency and the generation acceleration capacity are greatly improved, and the technical effect that hologram generation is rapidly completed is achieved.