High-power laser pulse carrier envelope phase locking method

Abstract

The invention relates to a high-power laser pulse carrier envelope phase locking method, belonging to the technical field of the ultrafast laser science and the precision measurement. The high-power laser pulse carrier envelope phase locking method adopts the double laser path interference technology of the self-reference measurement method to obtain the beat frequency signal which is fed back toa control laser through a phase locking circuit. The high-power laser pulse carrier envelope phase locking method is used for arranging a laser amplifying system in one branch of laser path used for generating the frequency doubled laser so as to amplify the frequency doubled laser at high power in the double laser path interference technology. The high-power laser pulse carrier envelope phase locking method has the advantage that the high-power laser can be output by keeping the carrier envelope phase stable. Compared with original method in which the amplification is carried out first and then the carrier phase is measured by using an f-2f system. The method adopting the phase locking circuit feedback to control the laser is more stable and practical and can obtain the beat frequency signal to noise ratio of higher than 40dB and ensure more stable high-power laser pulse carrier phase, longer working time and high output power.

Description

technical field [0001] The invention belongs to the technical field of ultrafast laser science and precision measurement, and specifically refers to a method for locking the phase of a high-power laser pulse carrier envelope. Background technique [0002] Precise control of the carrier envelope phase (CEP) of high-power laser pulses is an important way to realize high-power optical frequency combs and ultraviolet optical frequency combs. In addition, the carrier-envelope phase-locked pulsed light source can also be used in many aspects such as strong-field laser physics research, high-energy physics experiments and precision measurements. At present, the most commonly used method of pulse carrier envelope phase locking is self-referencing measurement technique (also known as f-2f system). The so-called self-reference measurement technology refers to the use of frequency multiplication of high-frequency components and low-frequency components of laser pulses for beating freq...

AI Technical Summary

Problems solved by technology

Due to the broadening of the pulse width, although the amplified laser pulse can generate a supercontinuum covering a frequency doubling layer in the f-2f system, the signal-to-noise ratio of the beat frequency signal is usually lower than 30dB, which greatly limits the laser pulse carrier. The locking effect of the envelope phase, and with the increase of the laser pulse energy, the nonlinear effect is enhanced, and the signal-to-noise ratio is also declining sharply, which also limits the further increase of the laser power

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