Large-stroke high-scanning frequency optical fiber delay line

Abstract

The invention discloses a large-stroke high-scanning frequency optical fiber delay line. The large-stroke high-scanning frequency optical fiber delay line comprises a mobile reflecting module and a fixed reflecting module which are mutually and oppositely arranged; the mobile reflecting module is connected with a drive motor through a connecting piece; the drive motor is connected to a computer through a driver, and motion control is performed by using upper computer software; each of the mobile reflecting module and the fixed reflecting module comprises a plurality of uniformly-arranged hollow aluminum pyramid reflecting mirrors, and the quantity of the hollow aluminum pyramid reflecting mirrors on the fixed reflecting module is one more than that of the hollow aluminum pyramid reflecting mirrors on the mobile reflecting module. According to the large-stroke high-scanning frequency optical fiber delay line disclosed by the invention, by utilizing the reverse reflection characteristic of the pyramid reflecting mirrors, reflected light can be strictly parallel to incident light, so that the effect of shaking on optical fiber coupling in the scanning process is reduced, and the system insertion loss is reduced; as the N pyramid reflecting mirrors and the N-1 pyramid reflecting mirrors are oppositely arranged, multiple reflections are formed in the two reflecting modules to realize optical path delay; in comparison with single pyramid reflecting mirrors, the delay scope can be improved by N times under the situation that the motor stroke is unchanged.

Description

technical field [0001] The invention belongs to the technical field of terahertz time-domain spectroscopy, and in particular relates to a large-stroke high-scanning-frequency optical fiber delay line. The present invention is applicable to the occasions of rapid collection of time-domain waveforms in most all-fiber terahertz time-domain spectroscopy systems. Background technique [0002] Terahertz time-domain spectroscopy (THz-TDS) technology can simultaneously detect the amplitude and phase information of THz pulses, and has shown great promise in many fields such as biology, material science, medical diagnosis, security inspection, non-destructive testing, military affairs, and physics and chemistry. It has rapidly developed into an interesting emerging research direction. In THz-TDS technology, the time-domain THz pulse waveform is realized by scanning and detecting the different delay parts of multiple THz pulses with femtosecond probe light, and the final THz pulse wav...

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Problems solved by technology

Traditional oscillating optical delay lines are difficult to achieve large delay range and high scanning frequency (≤150 ps@20 Hz) at the same time; rotating optical delay line can achieve large delay range and high scanning frequency (≥1 ns@≥100 Hz), However, the delay range is not adjustable, and it is difficult to couple with the fiber; the fiber stretched delay line can achieve high scanning frequency but the delay range i

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