Transmission-type grating phase shifter

Abstract

The invention relates to a transmission-type grating phase shifter, which is characterized by consisting of a first transmission-type grating, a second transmission-type grating and a third transmission-type grating which have the same grating structure, wherein the second grating and the third grating are positioned on the same plane; a grating surface of the first grating is opposite and mutually parallel to those of the second grating and the third grating and is vertically fixed on a device with an incident light beam; the device is provided with a precise fine-adjustment mechanism for controlling the second grating to move along a direction which is vertical the incident light beams and a grating groove; and the first grating, the second grating and the third grating have the same grating period d, duty ratio f and grating depth h, and d meets a relation formula, namely d is more than lambda and is less than 2 lambda, wherein lambda is the wavelength of incident light, the duty ratio f is equal to 0.4, and the grating depth h is equal to 1.074. The transmission-type grating phase shifter not only can be used for continuous phase shifting of continuous laser interference areas, but also can be used for the interference measurement of two-beam short pulses and ultra-short pulse lasers.

Description

technical field [0001] The invention relates to a transmission grating, in particular to a transmission grating phase shifter. Background technique [0002] As we all know, laser has many advantages such as its unique coherence, high brightness, monochromaticity and good directionality, so it has a wide range of applications in laser precision detection, high precision processing, scientific research and many industries. [0003] With the rapid development of laser technology, the corresponding laser interferometry technology is becoming more and more mature. However, the phase shifter devices used in laser interferometry in the past include half mirrors, flat mirrors, coated quartz plates and many Optical components that complicate the optical path of laser interference. The use of these optical elements not only increases the complexity of the optical path adjustment, increases the cost of the phase shifter device, but also increases the error of the experimental results....

AI Technical Summary

Problems solved by technology

H.U. Alpley, R.H. French, F.D. Calker, etc. invented a phase shifter by using a photomask, but the mask needs to be coated with an uneven attenuation film, and this technology requires a more complicated coating technology【 See prior art 3: H.U. Alpley, R.H. French, F.D. Calker, invention patent, application number: 93112904.4]

[0005] Most of the above-mentioned patented technologies for composing phase shifters use more optical components such as deflection slides, λ / 4 wave plates, λ / 2 wave plates, or require more complicated optical coating technology

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