A Pulse Time Synchronization System for Quantum Enhanced Laser Detection

Abstract

The invention provides a pulse time synchronization system for quantum enhanced laser detection. The system comprises a laser main light source (1), a delay unit (2), a time synchronization monitoring detector (3), a digital phase-locked unit (4), and a synchronous control unit (5). According to the system, the delay unit (2) is guided to carry out high precision optical pulse delay through the feedback signal of the digital phase-locked unit (4), a problem that the satisfaction of the time synchronization and maintenance of a pulse coherent characteristic at the same time in quantum enhanced laser detection by pump light, signal light and local-oscillator light are needed can be solved, the delay unit (2) adopts fiber or Fabry-Perot interference cavity to carry out fixed time delay modulation, the size is small, and the degree of integration is high.

Description

technical field [0001] The invention belongs to the field of quantum enhanced laser detection and the field of time synchronization of pulse sequences, in particular to a method for synchronizing homologous laser pulses. Background technique [0002] With the increasing demand for the imaging capabilities of existing classical remote sensing payloads, as well as the ability to detect, identify, and distinguish targets, quantum imaging technology has attracted widespread attention because of its potential application in breaking the theoretical limits of classical optical remote sensing. Classical imaging technology considers that the propagation of light and the interaction between light and matter are linear, which can be described by classical electromagnetic field theory. Compared with classical imaging technology, quantum imaging uses some nonlinear interactions that cannot be described by classical electromagnetic field theory to modulate the light field to form an imag...

AI Technical Summary

Problems solved by technology

However, the signal light pulse is emitted by the quantum-enhanced laser radar transmitter, and has a different path from the local pump light pulse and local oscillator light pulse, and there is an optical path difference. Measures need to be taken to eliminate the asynchronous problem caused by the optical path difference

Since the pump light pulse and the signal light pulse have the same source, they cannot be synchronized by cavity lock

Moreover, the optical path difference caused by different paths cannot be compensated by the all-optical method based on optical parametric amplification

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