A Ytterbium-Doped All-Fiber Optical Frequency Comb System

Abstract

The invention discloses an ytterbium-doped full-optical-fiber optical frequency comb system and relates to the technical field of frequency comb measurement. The system utilizes an ytterbium-doped full-optical-fiber annular cavity mode-locked laser to achieve mode-locked laser pulse output under the non-linear polarization rotation condition, achieves control chromatic dispersion in a cavity through a first band gap photonic crystal fiber and accordingly reduces in-cavity noise. An ytterbium-doped double-clad optical fiber amplifier is utilized to perform mode-locked laser pulse amplification, and a second first band gap photonic crystal fiber is utilized to achieve compression of mode-locked laser pulse width. Compressed mode-locked laser pulses pass through a tapering photonic crystal fiber welded with an optical fiber compressor to achieve output of an octave super-continuous spectrum. The full-optical-fiber performance of the whole ytterbium-doped full-optical-fiber optical frequency comb system achieves is achieved, repetition frequency and original frequency of an optical frequency comb can be locked, and the stability and portability of the ytterbium-doped optical frequency comb with a full-optical-fiber structure are improved.

Description

technical field [0001] The invention relates to the technical field of frequency comb measurement, in particular to an ytterbium-doped all-fiber optical frequency comb system. Background technique [0002] Optical frequency combs are used to achieve extremely precise measurements of optical frequencies, which are generated by mode-locked lasers, which are ultrashort pulse lasers. Ultrashort mode-locked optical pulses are composed of a series of equally spaced light pulses, which will appear as a series of equally spaced spectral components on the spectrum, thus forming an optical frequency comb. Here, two characteristics of the light pulses emitted by the mode-locked laser are key to developing an optical frequency comb. The first feature is the pulse phase: a small displacement of the envelope relative to the carrier, resulting in a slight change in the pulse, the peak of the pulse envelope can appear at the same time as the corresponding carrier peak, or can be offset to ...

AI Technical Summary

Problems solved by technology

However, due to the dispersion characteristics of ytterbium-doped fibers and other reasons, the existing ytterbium-doped optical frequency combs cannot realize the all-fiber design

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