Adjustable optical phase shifter and phase-shift process

Abstract

The invention discloses an adjustable optical phase shifter and the phase shifting process, which is made up of two acousto-optic modulators, radio frequency power amplifier and sine signal generator, the output end wire of the generator, one wire is connected to the input end of the radio frequency power amplifier, another wire is connected to the a electron phase shifter in series and then connected to the input end of another radio frequency power amplifier. The phase shifting process, the incoming ray enters the acousto-optic modulator 1, the sine wave signal generator transmits radio frequency signal with the same frequency to the radio frequency power amplifier and the electro phase shifter, adjusts and controls the electron phase shifter, the two acousto-optic modulators are driven by the radio frequency signal with the same frequency and different phase; the acousto-optic modulator generates the first grade diffraction as the incoming ray of the acousto-optic modulator the diffraction of the modulator is used as the output light, the output light has the same frequency to the incoming ray and the phase can be shifted. The merits of the invention are: it needs no phase shift label, and it can generate dynamic adjustable optical phase shift.

Description

technical field [0001] The invention relates to an optical phase shifter and a phase shifting process, in particular to an adjustable optical phase shifter and a phase shifting process directly controlled by an electronic method, and belongs to the field of photoelectric measurement technology. Background technique [0002] Various precision measurement technologies based on optical interference have been widely used in many scientific research and engineering fields, including surface quality inspection of optical parts, shape measurement of three-dimensional objects, etc. In traditional interferometry, the shape and maximum error of the measured surface are generally judged by visual inspection based on the shape and position of the interference fringes. This method not only has low precision and slow speed, but also can only obtain part of the information of the measured surface. With the rapid development of photoelectric and laser technolog...

AI Technical Summary

Problems solved by technology

This method of generating optical phase shift must be calibrated before use, and accurate calibration is often very difficult

In addition, the inherent nonlinearity of piezoelectric ceramics, hysteresis characteristics and aging factors will affect the phase shifting accuracy

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