Time-domain phase recovery all-fiber laser pulse weak phase measurement device and measurement method

Abstract

The invention provides a time domain phase recovery all-fiber laser pulse weak phase measuring device and method. The device comprises a fiber splitter arranged long the laser pulse input direction. The fiber splitter divides laser pulses to be measured into a high beam of light and a weak beam of light. An adjustable optical fiber delayer, a high speed optical fiber phase modulator, a dispersion optical fiber and an oscilloscope are successively arranged long the direction of the high light beam. A high speed PIN photoelectric tube, an arbitrary waveform generator and an electric signal amplifier are successively arranged long the direction of the weak light beam. An output end of the electric signal amplifier is connected with a modulation input end of the high speed optical fiber phase modulator. According to the invention, the all-fiber structure is utilized to carry out phase modulation and dispersion transmission on the laser pulses, the structure is compact, simple and flexible, and the measuring method is different from other laser pulse phase measuring modes; in addition, by adopting the measuring device and method, the weak phase picoseconds or nanosecond laser pulses can be measured, and the measuring device and method are applicable to the conditions of a high repetition frequency and a low repetition frequency.

Description

technical field [0001] The invention relates to a weak phase laser pulse, in particular to a time-domain phase recovery all-fiber laser pulse weak phase measurement device and measurement method. The invention adopts the optical fiber waveguide phase modulator to carry out phase modulation on the laser pulse, and then obtains the waveform and phase of the laser pulse through the method of time domain phase recovery. The invention is suitable for picosecond or nanosecond laser pulses with weak phase and weak chirp, and can work under the condition of high repetition frequency or low repetition frequency. The device adopts an all-fiber structure to increase the stability and compactness of the device, thereby obtaining a stable and reliable laser pulse phase distribution. Background technique [0002] Since the first laser was manufactured, the application of lasers and lasers has gradually penetrated into all walks of life in society, especially for the precision processing ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantage that the above-mentioned existing laser pulse time phase measurement method cannot measure weak phase nanosecond or picosecond laser pulses, and propose a time-domain phase recovery all-fiber laser pulse weak phase measurement device and measurement method. The method adopts the time-domain phase iterative recovery method, and uses the direct phase modulation device to modulate the phase of the laser pulse, and calculates the waveform and phase of the initial laser pulse by using the time waveform of the phase-modulated laser pulse after passing through the dispersive medium as a known condition distributed

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