Light beam intensity, phase distribution and polarization modulation device

Abstract

The invention relates to a light beam intensity, phase distribution and polarization modulation device. A femtosecond laser emits laser, and a light beam is adjusted to be a parallel light beam through a paraboloid mirror. The light beam passes through a first reflector, and reaches a beam splitting mirror to be divided into two light beams: the transmitting light beam passes by a first spatial light modulator and then passes by a second reflector to enter a time delay device, and finally passes through a third reflector to reach the beam splitting mirror; and the reflected light beam passes by a fourth reflector and then passes by a second spatial light modulator and a fifth reflector to reach a beam combiner; the combined light beam is outputted to a detection device. The first spatial light modulator, the second spatial light modulator and the detection device are connected with a computer. The spatial light modulators are controlled through a computer optimization algorithm, and achieve the modulation of light beam intensity, phase and polarization at the same time. The device is simple in structure, is low in device cost, and is wide in application range.

Description

technical field [0001] The invention relates to an optical signal processing technology, in particular to a modulation device for beam intensity, phase distribution and polarization state. Background technique [0002] Optical modulation is widely used in the field of optical research. Optical modulation is to superimpose a signal carrying information on the carrier light wave. The device that completes this process is called a modulator. The modulator can make the parameters of the carrier light wave change with the external signal, and these parameters include the amplitude, phase, frequency, polarization, wavelength, etc. of the light wave. The modulated light wave carrying information can obtain the required information after being demodulated by the photodetector system. Optical modulation technology has been widely used in optical communication, ranging, optical information processing, optical storage and display, etc. [0003] A spatial light modulator is a device t...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that the existing modulation device of beam intensity, phase and polarization state is complex in operation and expensive, and cannot simultaneously modulate the intensity and phase of a beam of special polarization state, and proposes a beam intensity, phase distribution And the modulation device of the polarization state, after splitting the laser beams, they pass through the spatial light modulator and then combine the beams to output. The spatial light modulator is controlled by a computer optimization algorithm, which can realize the modulation of beam intensity, phase and polarization state at the same time

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