Light frequency reference fiber femtosecond light frequency comb with tunable broadband repetition frequency

Abstract

The invention relates to a light frequency reference fiber femtosecond light frequency comb with tunable broadband repetition frequency. The comb comprises a hybrid-locking-based erbium-doped fiber femtosecond laser device with tunable broadband repetition frequency, a reference laser locking system based on piezoelectric ceramic, a reference laser locking system based on a pumping current, a computer control system and a temperature control system, wherein the erbium-doped fiber femtosecond laser device is an annular chamber structure and is internally added with an electric control optical delay wire, and the repetition frequency of the laser device can realize continuous tunable broadband. For realizing light frequency reference femtosecond pulse output, rapid and slow piezoelectric ceramics and the pumping current are employed to cooperatively control beat frequency of the femtosecond laser device and two reference laser devices, the rapid piezoelectric ceramics fixing structure which is easy to use is designed, and a temperature control box is further designed to acquire stable beat frequency; the light frequency reference fiber femtosecond light frequency comb has advantages of light frequency reference output, tunable broadband repetition frequency, good stability and small size and further has application potential in the industrial environment.

Description

technical field [0001] The invention belongs to the field of measurement technology, and in particular relates to an optical frequency reference optical fiber femtosecond optical frequency comb whose repetition frequency can be tuned in a broadband manner. Background technique [0002] The dual optical frequency comb measurement system uses two femtosecond lasers with a certain repetition rate difference as the main body, realizes asynchronous optical sampling in the time domain, and simultaneously completes multi-heterodyne parallel measurement in the frequency domain, which has the advantages of fast measurement speed and traceable measurement results. . However, the measurement advantage of a dual optical frequency comb system is heavily dependent on laser performance. First of all, frequency stability plays a decisive role in the measurement index of dual optical frequency comb. At present, the output laser frequency of commercial optical frequency combs is mostly dire...

AI Technical Summary

Problems solved by technology

The reported scheme uses the optical frequency domain reflectometer to indicate the laser cavity length, but the actual operation is limited by the cut length of the fiber, which will bring a lot of inconvenience

In 2004, Washburn et al. and Hundertmark et al. added an optical delay line to the laser cavity, so that the repetition rate can be tuned continuously, but the tuning range is still limited

Finally, femtosecond fiber laser mode-locking stability affects system efficiency

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