An optical delay structure and device

Abstract

An optical delay structure (100) and device. The optical delay structure (100) comprises a first reflective curved surface (110) and a second reflective curved surface (120), which are smoothly connected; the projection of the first reflective curved surface (110) on a set plane is a first curve, and the projection of the second reflective curved surface (120) on the same set plane is a second curve; the first curve and the second curve are smoothly connected, and the set plane is defined as an x-y plane. The first reflective curved surface (110) and the second reflective curved surface (120) satisfy the following: when light is incident on the first reflective curved surface (110) from a first position (xa, ya) outside of the delay structure (100) in a direction parallel to the x-y plane, the light is then reflected by means of the first reflective curved surface (110) onto the second reflective curved surface (120), and is emitted by means of the second reflective curved surface (120) to a second position (xb, yb) outside of the delay structure (100) in a direction parallel to the incident direction. An external drive structure drives the optical delay device to rotate at a constant speed such that the linearity of light delay following time may be obtained by means of the linearity of light delay following angle of rotation.

Description

technical field [0001] The invention relates to the field of optical delay, in particular to an optical delay structure and device. Background technique [0002] At present, the terahertz pulse signal width generated by the terahertz time-domain spectrometer is only a few picoseconds, and a femtosecond laser needs to be used to excite the semiconductor to sample the pulse signal. The arrival time of the femtosecond laser pulse to terahertz needs to be changed in order to collect the signal intensity at different positions of the terahertz pulse. The femtosecond laser passes through the delay line, which can change the optical path of the femtosecond laser. The linearity of the delay line will affect the accuracy and consistency of the collected signal. The nonlinear delay line will cause the femtosecond laser pulse optical path to change nonlinearly, and the collected signal will also be nonlinear, which will distort the terahertz pulse signal. Increase the difficulty of d...

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide an optical delay structure and device for the problems of pulse signal distortion and difficult data processing

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