Automatic control optical delay line device

Abstract

The invention discloses an automatic control optical delay line device, which relates to the technical field of optical delay scanning devices. The automatic control optical delay line device comprises a fixed bottom plate, wherein the upper surface of the fixed bottom plate is provided with a driving motor mechanism, the right side of the driving motor mechanism is provided with an optical fiberfixing mechanism, and the upper surface of the optical fiber fixing mechanism is provided with a light propagation system. The automatic control optical delay line device enables an attenuation ratioto be precisely controlled through setting the optical fiber fixing mechanism and adopting a mode of one end attenuation and one end straight through, makes the replacement of an attenuation slice very convenient by means of an attenuation slice fixing plate designed in the optical fiber fixing mechanism, so as to achieve the purpose of adjusting the attenuation ratio arbitrarily, and precisely controls a horizontal displacement amount of a pyramid prism by means of rotation of a stepping motor, thereby ensuring the accuracy of light delay. In addition, a manual adjustment knob is designed inthe automatic control optical delay line device, and the displacement of the pyramid prism can be indirectly controlled by manually adjusting the motor to rotate, so as to meet the test requirements.

Description

technical field [0001] The invention relates to the technical field of optical time-delay scanning devices, in particular to an automatic control optical time-delay line device. Background technique [0002] The optical delay scanning device is used to realize the delay scanning function between two beams of light, and is widely used in optical detection systems based on ultrafast time resolution, such as optical coherence tomography and terahertz time-domain spectroscopy. [0003] Currently existing solution 1: a high-speed optical delay linear scanning device disclosed in Chinese Patent Publication No. CN107390361A, which can achieve a higher scanning rate and has good stability and linearity, and the disadvantage is that there is no Attenuation sheet, the light attenuation ratio cannot be adjusted arbitrarily. In this scheme, no fiber collimator is used, and the optical coupling efficiency is low. In this scheme, the assembly of fan-shaped reflector, quarter-wave plate, p...

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Problems solved by technology

[0003] Currently existing solution 1: a high-speed optical delay linear scanning device disclosed in Chinese Patent Publication No. CN107390361A, which can achieve a higher scanning rate and has good stability and linearity, and the disadvantage is that there is no Attenuation sheet, the light attenuation ratio cannot be adjusted arbitrarily. In this scheme, no fiber collimator is used, and the optical coupling efficiency is low. In this scheme, the assembly of fan-shaped reflector, quarter-wave plate, polarizing beam splitter and motor There are strict requirements on the position, and the assembly is difficult

[0004] Existing solution 2: In the article "High-speed and high-stability optical delay line device" published in the journal "Laser and Optoelectronics Progress" of "China Laser" magazine "Laser and Optoelectronics Progress" in 2017, Volume 54, Issue 3, an optical delay line device is disclosed. The line device is used to improve the scanning frequency and delay time of the Fast Optical Delay Line (FODL) device based on the involute principle. The disadvantage of this solution is: there is no attenuation sheet in this solution, and the light attenuation ratio cannot be adjusted arbitrarily. In this solution Without the use of fiber optic collimators, the optical coupling efficiency is low, and the assembly of the rotating shaft, rotating flat mirror and involute curved mirror contained in this scheme is difficult, so we provide an automatic control optical delay line device

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