32results about How to "Achieving Phase Modulation" patented technology

The invention provides a laser beam shimming and speckle restraining device. The device comprises a circular truncated cone-shaped optical wand, a motor, a wedge-shaped scattering disc and a pyramid frustum-shaped light pipe. According to the device, the circular truncated cone-shaped optical wand receives incident beams which shine out as an annular facula at the outgoing end after being reflected repeatedly in the optical wand, and the outgoing beams are scattered through the scattering disc driven by the motor, shine onto the incident end of the pyramid frustum-shaped light pipe as annular incident light, reshaped to be rectangular after being reflected repeatedly in the light pipe, and then shine out through the outgoing end of the light pipe. The device is simple in structure, stable in operation, good in speckle eliminating effect, and even in optical field and can be applied to the lighting or displaying technical field with coherent light as the light source.

The invention relates to the technical field of semiconductor photoelectronic devices, and discloses a photonic crystal laser array with high brightness and horizontal far-field single distribution. According to the photonic crystal laser array, phase modulation of the laser array output mode is carried out through photonic crystal, and laser output with high brightness and horizontal far-field single distribution is generated. The photonic crystal laser array comprises a module coupling area, a photonic crystal area and a transmission area, wherein the mode coupling area generates a stable opposite-phase mode which is modulated by the photonic crystal area and is converted into a same-phase distribution mode, and the converted mode outputs a single far-field pattern with a narrow divergence angle on the reflection area. The waveguides of the module coupling area, the photonic crystal area and the transmission area are all completed through traditional ordinary photoetching and etching processes. The photonic crystal laser array with high brightness and horizontal far-field single distribution effectively solves the problem that when the output power of a semiconductor transmission laser array is too high, horizontal far-field double distribution and a large divergence angle occur, and generates high-brightness laser, and the brightness of the laser is improved by one level expectedly.

The invention discloses a high-speed low power consumption 16QAM (Quadrature Amplitude Modulation) emitting device which comprises a phaselocked loop frequency synthesizer, a four-dividing frequency divider, a first selected four phase gate I, a first selected four phase gate II, a phase demodulator, a variable gain power amplifier and a 16QAM digital demodulator, wherein the output end of the phaselocked loop frequency synthesizer is connected with the input end of the four-dividing frequency divider; the input end of the four-dividing frequency divider is connected with the output end of the phaselocked loop frequency synthesizer; the input end of the first selected four phase gate I is connected with the output end of the four-dividing frequency divider; the input end of the first selected four phase gate II is connected with the output end of the four-dividing frequency divider; the input end of the phase demodulator is respectively connected with the output ends of the first selected four phase gates, the phase demodulator is used for generating a phase demodulated signal and driving the variable gain power amplifier; the input end of the variable gain power amplifier is connected with the output end of the phase demodulator; the variable gain power amplifier is used for generating two different kinds of signal amplitudes and driving an antenna ohm load; and the output end of the 16QAM digital demodulator is respectively connected with the input ends of the first selected four phase gate, the phase demodulator and the variable gain power amplifier, and the 16QAM digital demodulator is used for carrying out serial parallel conversion on serially input baseband data and forming four parallel data required by the 16QAM demodulation.

The invention provides a sound detection and positioning system, and the system comprises a sound sensor array and a sound wave conduit array, wherein the sound sensor array comprises N sound sensor units, and N is not less than two. The sound wave conduit array comprises M sound wave conduits, wherein M is not less than two. Two ends of each sound wave conduit are opened and connected and are shaped like a circular pipe, wherein one end of each sound wave conduit is connected with the corresponding sound sensor unit, and the other end of each sound wave conduit is disposed in the air. A sound signal transmitting in the air enters into the sound wave conduits of the sound wave conduit array, and then is received by the sound sensor units of the sound sensor array. The system is small in size, is light in weight, and is portable. The sound sensor array is compact in structure, and difference on the sound sensor units from an external environment is small. The measurement accuracy of the system is high.

An unconventional metasurface sparse aperture lens is composed of a light-transmitting substrate and a metasurface microstructure layer. The metasurface microstructure units are distributed in the four sector ring regions, constituting the sub-apertures of the sparse aperture. By controlling the parameters of the metasurface microstructure units, the focusing of incident light at a specific wavelength can be achieved. The metasurface structure phase modulation of the metasurface sparse aperture lens is accurate, and the phase modulation between ‑pi and pi can be realized, and the modulation interval is less than 0.3. And through the sparse aperture technology, resolution imaging beyond the sub-aperture size can be achieved, which significantly reduces the lens processing area, reduces the processing difficulty, and reduces the process cost. The invention has great application value in the microscopic imaging system.

The invention discloses a wide-angle Michelson interferometer and a wind field detecting method based on LCoS. The wide-angle Michelson interferometer comprises a tetrahedral beam splitting prism, wherein the beam splitting prism is formed by cementing a right-angled triple prism a and a right-angled triple prism b which are made of the same material and have the same refractive index at a slope,a semireflecting and semitransparent film is plated on a cemented surface, a tetragonal glass cube a is cemented at one side of the right-angled triple prism a, a polaroid sheet is pasted at the other side of the glass cube a, an LCoS reflective liquid crystal is pasted at the other side of the polaroid sheet, a glass cube b is cemented at one side of the right-angled triple prism b, a total reflecting film is plated at the top of the glass cube b, and the glass cube b and the glass cube a are adjacently arranged. The wind field detecting method comprises the steps of applying different voltages onto the LCoS reflective liquid crystal for modulating the phase position of incident light and providing stepping phase positions for light with different wavelengths so as to detect an atmospheric wind field. The interferometer and the wind field detecting method have small power consumption, good anti-seismic performance and considerable cost.

Techniques are described to form an optical waveguide switch that could reach a very high extinction ratio. In particular, this disclosure describes an asymmetric MZI, in which different waveguide capacitor structures are used in two arms of the MZI: a first arm with a waveguide capacitor to achieve the mainly phase modulation and a second arm with a waveguide capacitor to achieve mainly the magnitude modulation, respectively. Using the asymmetric MZI in accordance with this disclosure, one can design an algorithm to achieve almost unlimited extinction ration during the switching operation.

The invention provides an intelligent optical power distribution device based on a meta-surface material. The intelligent optical power distribution device is characterized by comprising a meta-surface array structure formed by arranging nano-brick units and capable of focusing orthogonal linear polarization lights irradiating in major-minor axis directions of the nano-brick units on different locations so as to perform optical power distribution, wherein each nano-brick unit is composed of a dielectric substrate and a nano-brick formed on the dielectric substrate, and the dielectric substrateand the nano-brick are in sub-wavelength size. The intelligent optical power distribution device provided by the invention performs phase operation on the orthogonal optical wave in the major-minor axis directions of the nano-bricks by utilizing polarization independent feature for transmitting the phase meta-surface material, and the orthogonal optical waves in the major-minor axis directions ofthe nano-bricks can be respectively focused on different locations, thereby realizing efficient optical power distribution.