Low noise fiber laser frequency combs device with controllable carrier envelope phase shift frequency

Abstract

The application provides a low noise fiber laser frequency combs device with controllable carrier envelope phase shift frequency. The low noise fiber laser frequency combs device with controllable carrier envelope phase shift frequency comprises an optical path structure and a circuit structure, wherein the optical path structure comprises an oscillator, an acousto-optic frequency shifter, an optical fiber amplifier, a pulse compressor, an optical fiber spread spectrum device and a coherent heterodyne beat device; and the circuit structure comprises a feed-forward circuit control phase device and a phase-locked loop circuit control repetition frequency device. The fiber laser oscillator can ensure long-time operation of a system, so that the stability of the system is superior to that of a system adopting a solid laser oscillator; through the technologies of optimizing intracavity net dispersion of the fiber oscillator, introducing an inner cavity modulator in the oscillator, adopting the feed-forward acousto-optic frequency shifter, and the like, the low noise fiber laser frequency combs device can be realized; and meanwhile, due to the application of the acousto-optic frequency shifter, the carrier envelope phase shift frequency of the optical frequency combs can be accurately regulated, so that the optical frequency combs device with precise phase position regulation and secular stability is provided for realizing applications such as optical frequency standard, attosecond science and non-linear optics.

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 for locking, 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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