Method for generating high repeat frequency and high power optical frequency comb

Abstract

The invention provides a method for obtaining a high-power optical frequency comb. The method adopts at least four levels of fiber cascade amplification and comprises a preamplification system and a main amplification system; the preamplification system comprises at least two ytterbium doped single-mode fiber amplifiers; the main amplification system comprises at least two large mode field ytterbium doped double-coating fiber main amplifiers; and signal laser is injected to a common single mode fiber, is connected with a wavelength division multiplexer (WDM) and is conducted to the preamplification system and the main amplification system for amplification. The method has the advantages that the method amplifies optical frequency comb laser with ultralow average power to over hectowatt magnitude, greatly reduces the requirement on the power of seed optical frequency comb laser, and has a simple structure and convenient operation.

Description

technical field [0001] The invention relates to the direction of ultrafast laser technology, specifically a new method for amplifying high-repetition, high-power frequency optical frequency comb lasers. Background technique [0002] Current research in the field of optics is moving towards 10 -18 frequency standard accuracy, 10 -18 Second (attosecond) time resolution accuracy advances, precision spectroscopy has become a new basis for the exploration of a series of major basic scientific issues beyond traditional physics and the development of high-tech, and is closely related to information, life, materials, environment, Developments in scientific fields such as aerospace are closely related. In terms of time ultra-high resolution of precision spectroscopy, humans began to enter the femtosecond (10 -15 s) In the era of ultrafast, in recent years, ultrafast optics and spectroscopy with ultra-high time resolution are undergoing a leap from femtoseconds to sub-femtoseconds ...

AI Technical Summary

Problems solved by technology

The generation of such high average power depends on the power output of the oscillator alone is not enough

However, the accumulation of thermal effects becomes an insurmountable obstacle when traditional laser amplification media and amplification methods deal with this kind of comb pulse with a repetition rate of 100 megahertz.

However, the method of external cavity enhancement requires fine external cavity structure design and adjustment, high-quality optical lens polishing and coating, and accurate intra-cavity dispersion control and compensation, which makes the development process very difficult.

In order to meet the experimental needs of ultraviolet nonlinear optics, generation of attosecond pulses and extreme ultraviolet optical frequency combs, etc., at present, the experimental research of high-power optical frequency combs is being carried out internationally. The most advanced existing large The average power of the power femtosecond optical frequency comb only reaches 10W (developed by JILA USA)

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