A Dual Femtosecond Laser Optical Frequency Comb Locking Device Based on Fiber Delay Line

Abstract

The invention discloses a fiber delay line-based dual-femtosecond laser optical frequency comb locking device. The fiber delay line-based dual-femtosecond laser optical frequency comb locking device comprises a femtosecond laser, a carrier envelop deviation frequency locking system, a fiber Bragg grating, a wavelength division multiplexer, a 2 by 2 fiber beam splitter, a Faraday polariscope, a fiber delay link, an adjustable dispersion compensation system, an acoustic-optical modulator, a Faraday polariscope, a photoelectric detector, a frequency mixer, a locked-phase controller and a radio-frequency standard and electrical frequency multiplexer, wherein the 2 by 2 fiber beam splitter comprises four ports a, b, c and d. The device is applicable to two communication wave band femtosecond lasers with certain repetition frequency difference, the repetition frequencies of the two lasers are locked by a kilometer-order fiber delay link, fixed frequency difference is generated, the locking of a carrier envelop deviation frequency is achieved by a self-reference interferometer, and running of the dual-pulse femtosecond laser device is achieved. The device has the advantages of simple structure, low cost, adjustable repetition frequency and the like.

Description

technical field [0001] The invention relates to the fields of femtosecond laser ranging and ultrafast spectroscopy based on pulse time-of-flight, in particular to a dual femtosecond laser optical frequency comb locking device based on an optical fiber delay line. The repetition frequency difference of the output pulse sequence of the two lasers in the device can be locked to any frequency value, and can be applied to the double femtosecond laser optical frequency comb locking of the femtosecond laser in the communication band. Background technique [0002] Optical frequency combs were invented in the 1990s and have been widely used in measurement fields, such as time-frequency reference, distance measurement, spectroscopy, etc. Two femtosecond laser optical frequency combs with constant repetition frequency difference and stable carrier envelope offset frequency are called dual femtosecond laser optical frequency comb system. In the double femtosecond laser optical frequenc...

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Problems solved by technology

However, the ultra-stable cavity is limited by the disadvantages of complex structure, extremely expensive cost, and high cost, which is not conducive to popularization.

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