High Power Ultrashort Pulse Optical Frequency Comb Generation Method Based on Self-Similar Amplifier

Abstract

The invention discloses a high-power ultrashort-pulse optical frequency comb generation method based on a self-similar amplifier. The high-power ultrashort-pulse optical frequency comb generation method is based on self-similar amplification technology and effectively overcomes gain narrowing, bandwidth limitation and nonlinear phase distortion in pulse amplification. A light spectrum is effectively expanded, and the bandwidth of an output pulse is reduced. Furthermore the power of a mode-locked pulse is effectively expanded, thereby acquiring a high-power femtosecond pulse and improving carrier envelope phase zero-frequency locking precision. Furthermore carrier envelope phase zero-frequency locking technology based on an acoustic-optical crystal frequency shifter is utilized, thereby realizing large reaction bandwidth and high control precision, and realizing a high-frequency high-power ultrashort-pulse optical frequency comb through real-time control. The high-power ultrashort-pulse optical frequency comb generation method is advantageous in that the high-power ultrashort-pulse optical frequency comb generation method can be directly expanded and applied on femtosecond optical frequency comb control technology for obtaining the stable high-frequency high-power ultrashort-pulse optical frequency comb.

Description

technical field [0001] The invention belongs to the technical field of ultrafast optics, and in particular relates to a method for generating a high-power ultrashort pulse optical frequency comb 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 o...

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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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