Periodic scanning optical delay line based on inclined parabolic type bus helical face reflection mirror

Abstract

The invention discloses a period scanning optical delay line based on the spiral surface reflector of a tilted parabolic type bus. The period scanning optical delay line based on the spiral surface reflector of a tilted parabolic type bus comprises: the spiral surface reflector of the tilted parabolic type bus, a back reflector, and a drive motor. The spiral surface reflector of the tilted parabolic type bus comprises the spiral surface reflector of a convex surface type tilted parabolic type bus and the spiral surface reflector of a concave surface type tilted parabolic type bus; the back reflector is used for controlling light beams to be reflected by the period scanning optical delay line of the spiral surface reflector of the tilted parabolic type bus along the original path. The period scanning optical delay line based on the spiral surface reflector of the tilted parabolic type bus has the advantages that: the spiral surface reflector of the tilted parabolic type bus and the back reflector are combined to enlarge the linear delay time, and eliminate the translation motion of a one-way spiral surface delay line on reflected light to lead the delay line to be simple and compact in structure.

Description

technical field [0001] The invention relates to a periodic scanning optical delay line based on an inclined parabolic generatrix helical surface mirror, and belongs to the technical field of time-resolved optical delay lines. Background technique [0002] In the field of optics and optoelectronics, people have been working on the development of optical delay lines. The optical delay line is a device that realizes the precise controllable relative delay time between the coherent light pulses participating in the experiment by technical means. Optical delay lines are the key components of time-resolved optical systems and have a wide range of applications in technical fields, such as: THz time-domain spectroscopy, ultrafast time-resolution spectroscopy, time-resolved interferometric spectroscopy, optical coherence tomography, and optical pumping Pu-detection technology, etc. [0003] There are various techniques for realizing optical delay. The simplest and most commonly use...

AI Technical Summary

Problems solved by technology

However, through the theoretical analysis of differential geometry, it is found that this optical delay line has the following technical barriers: (1) The mirror surface of the optical delay line is a saddle surface, and the original plane wavefront reflected by the mirror is distorted into a saddle surface, And when the lift distance increases (corresponding to a larger time delay range) and the radius of gyration decreases, the saddle-shaped wavefront distortion becomes more serious, and the saddle-shaped optical wavefront distortion is complex curved surface wavefront phase distortion, which is difficult to compensate by conventional optical devices Correction; (2) The angle between the outgoing beam and the incident beam of the optical delay line depends on the distance between the lift of the helicoid and the incident point of the incident light from the axis of rotation. The included angle of the light beam is generally only 1 to 5 degrees, it is difficult to install optical devices in a short optical path to realize the optical delay function, and it is difficult to realize the miniaturization of the system with a long optical path, and it will affect the stable operation of the system; (3) due to the above (2), the optical delay line based on the straight-toothed helical mirror can only be set with a one-time reflection optical path, so that the maximum delay optical path of the optical delay line is only twice the helicoid lift distance, which limits the maximum delay range; (4) Due to the above (3), the optical delay line is accompanied by translation of the reflected light beam during the scanning delay time, and the larger the lift distance, the greater the translation amount. This translation brings inconvenience and test errors to many application fields. limits the wide application of this delay line

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