Method and device for generating high-precision optical fiber optical comb seed pulse through full-optical difference frequency

Abstract

The invention discloses a method and a device for generating a high-precision optical fiber optical comb seed pulse through full-optical difference frequency. The method is integrated with the processes of optical fiber ultrashort pulse generation, high-power optical fiber amplification, optical fiber non-linear frequency mixing, optical difference frequency and frequency doubling and the like; the device comprises a laser oscillator, a six-wave mixing amplifier, an optical comb difference frequency device and an optical comb frequency doubling device. Laser pulse finally output by the device is extremely close to system initial seed light frequency, and the carrier envelope phase is stable, so that the device can be directly taken as a seed optical comb of an optical fiber amplifier of a wave band corresponding to signal light. Two signal light required in the difference frequency process comes from the same non-linear mixing process, so that the phase noise of the signal light generated during the difference frequency can be automatically eliminated, and optical comb laser with high pulse strength and high contrast ratio, in which the infrared band carrier envelope phase is zero, is obtained.

Description

Technical field [0001] The invention relates to the field of optical technology, in particular to a method and device for generating high-precision fiber optic comb seed pulses by adopting all-optical difference frequency. Background technique [0002] Since the end of the last century, the research on optical frequency combs has developed rapidly. How to accurately define the basic units of physical quantities such as time and length has always been the focus of attention in the field of international science and technology. The current time standard is defined on the ultrafine transition frequency of the ground state of the cesium atom. Although this transition as a time standard has a very narrow line width, that is, this transition has an objective and stable transition frequency. Unfortunately, this frequency falls in the microwave range (9.2 GHz), and the spectral line Q value is not very high. Extending the time standard from the microwave range to the frequency of visi...

AI Technical Summary

Problems solved by technology

The most commonly used method is to control the cavity length of the fiber laser oscillator and the injected pump power, but this method requires extremely high control accuracy of the fiber length and pump light intensity, and sometimes it is even difficult to achieve

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