Double-femtosecond optical frequency comb generation device

Abstract

The invention relates to a double-femtosecond optical frequency comb generation device belonging to the technical field of femtosecond laser. The device is provided with an annular resonant cavity structure consisting of an optical fiber and a spatial light path and comprises a pumping source, a wavelength division multiplexer, piezoelectric ceramic, an er-doped fiber, a single mode fiber, a firstoptical fiber collimating mirror, a second optical fiber collimating mirror, a spatial optical path element first 1 / 4 wave plate, a first 1 / 2 wave plate, a polarization beam splitter, an opto-isolator, a second 1 / 2 wave plate, a second 1 / 4 wave plate as well as a grating pair, wherein the grating pair consists of a first grating and a second grating and is arranged between the polarization beam splitter and the opto-isolator. According to the device, an optical path difference is introduced through the grating pair, so that double-femtosecond optical frequency combs with repeated frequency differences are generated, and the repeated frequency differences can be adjusted according to the distance between the grating pair. The device provided by the invention is low in cost, small in size,simple and compact in structure, convenient to operate and wide in engineering application prospect.

Description

technical field [0001] The invention relates to a double femtosecond optical frequency comb generating device, which belongs to the technical field of femtosecond lasers. Background technique [0002] The femtosecond laser is a series of spectral lines distributed at equal intervals in the frequency domain, and the spectral line interval is equal to the repetition frequency of the femtosecond laser, forming a comb structure, so it is also called a femtosecond optical frequency comb. The femtosecond optical frequency comb has a large spectral range, narrow spectral line width, and can be traced to the frequency reference, which is very suitable for spectral measurement and analysis. In 2005, American scientist Hall and German scientist Hensch won the Nobel Prize in Physics for their "revolutionary research results in laser precision spectroscopy, especially optical frequency comb technology". [0003] The dual-comb spectral measurement technology based on dual femtosecond op...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the existing problems of large volume, complex structure, poor stability and low coherence between the generated dual femtosecond optical frequency combs when the dual femtosecond optical frequency combs are generated by two devices, and to provide a dual femtosecond optical frequency comb. second optical frequency comb generator

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