A low-noise fiber laser frequency comb device with controllable carrier envelope phase shift frequency

Abstract

The present application provides a low-noise fiber laser frequency comb device with controllable carrier envelope phase shift frequency, which includes an optical path structure and a circuit structure, wherein the optical path structure includes an oscillator, an acousto-optic frequency shifter, a fiber amplifier, A pulse compressor, an optical fiber spread spectrum device and a coherent heterodyne beat frequency device; the circuit structure includes a front-feedback circuit controlling a phase device and a phase-locked loop circuit controlling a repetition frequency device. Among them, the fiber laser oscillator can ensure the long-term operation of the system, and the system stability is better than that of the solid-state laser oscillator; by optimizing the intracavity net dispersion of the fiber optic oscillator, introducing an intracavity modulator into the oscillator, and using front-feedback acousto-optic frequency shifting technologies such as devices to realize low-noise fiber laser frequency comb devices; at the same time, the use of acousto-optic frequency shifters can precisely control the carrier envelope phase shift frequency of optical frequency combs, thereby realizing optical frequency standards, attosecond science, non- Applications such as linear optics provide long-term stable optical frequency comb devices with precise phase manipulation.

Description

technical field [0001] The invention relates to the technical field of ultrafast fiber laser, in particular to a low-noise fiber laser frequency comb device with controllable carrier envelope phase shift frequency. Background technique [0002] Femtosecond laser frequency comb is one of the most cutting-edge research contents in the field of ultrashort pulse laser. In the late 1990s, the proposal and realization of femtosecond titanium-sapphire-doped laser frequency comb revolutionized the optical frequency standard. In recent years, with the development of ultrashort-pulse fiber lasers, the advantages of fiber lasers such as compact structure and stable operation have gradually attracted people's attention to optical frequency combs based on fiber lasers. In 2002, the National Institute of Standards and Technology (NIST) of the United States reported for the first time the erbium-doped fiber laser frequency comb. In 2010, the American IMRA company also reported the realiza...

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Problems solved by technology

However, the common disadvantage of these methods is that when the feedback circuit is used to lock, first, the proportional integral (PI) loop of the phase-locked loop is required to perform time integration to obtain the control signal, and second, the carrier envelope phase shift frequency after locking is a fixed value , cannot be adjusted

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