Self-similarity amplifier based high-power ultrashort pulse optical frequency comb apparatus

Abstract

The invention discloses a self-similarity amplifier based high-power ultrashort pulse optical frequency comb apparatus. The optical frequency comb apparatus comprises a laser seed source, a pulse amplification and control module, a repetition frequency locking module, a carrier envelope phase zero frequency signal measurement module and a carrier envelope phase zero frequency locking module; the laser seed source is connected with the pulse amplification and control module and the carrier envelope phase zero frequency locking module in sequence; the output end of the pulse amplification and control module is connected with the laser seed source through the repetition frequency locking module to form a backward closed loop cavity; and the output end of the pulse amplification and control module is connected with the carrier envelope phase zero frequency locking module through the carrier envelope phase zero frequency signal measurement module to form a forward closed loop cavity. The self-similarity amplifier based high-power ultrashort pulse optical frequency comb apparatus has the advantages that the optical frequency comb apparatus is based on a self-similarity amplification technology, and the problems of narrowed gain, limited bandwidth and nonlinear phase distortion in the pulse amplification are effectively overcome; and the spectrum is effectively broadened, high-power femtosecond pulse is obtained, and the carrier envelope phase zero frequency precision is improved.

Description

technical field [0001] The invention belongs to the technical field of ultrafast optics, and in particular relates to a high-power ultrashort pulse optical frequency comb device based on a self-similar amplifier. Background technique [0002] The femtosecond optical frequency comb with precise control in the time-frequency domain is a major technological leap in precision spectroscopy, precision measurement and related scientific fields. It is an important technology to improve the accuracy of spectrum measurement and develop more accurate time / frequency standards than atomic microwave clocks. Innovation, and as a special laser light source different from traditional continuous frequency-stabilized lasers, it has important applications in optical precision measurement fields such as laser frequency scales, absolute distance measurements, and precision spectrum measurements. Accurate measurement is of great significance. [0003] Traditionally, femtosecond optical frequency ...

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Problems solved by technology

[0005] However, the chirped cascade amplification system also has many deficiencies, which limit the development of optical frequency combs in the direction of wide spectrum and high precision.

First of all, the gain narrowing effect of the gain fiber itself will significantly reduce the spectral components of the pulsed laser in the cascaded amplification, reduce the limit pulse width of the pulse, and affect the detection signal-to-noise ratio of the carrier envelope phase offset frequency, thereby limiting the optical Locking Accuracy and Spectral Broadband of Frequency Comb

Secondly, the chirped cascade amplification system often requires longer optical fibers to broaden the pulse in the time domain, which will introduce a large amount of high-order dispersion and nonlinear noise, which is not easy to compensate, resulting in pulse distortion and affecting the high-precision locking of the optical frequency comb.

On the other hand, the traditional carrier envelope phase locking technology based on pump current feedback control has the characteristics of narrow bandwidth, limited control range and slow response speed, which limit the wider application of femtosecond optical frequency combs.

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