Astronomical optical frequency comb device based on all-solid femtosecond laser

Abstract

The invention provides an astronomical optical frequency comb device based on an all-solid femtosecond laser. The astronomical optical frequency comb device based on the all-solid femtosecond laser comprises the all-solid femtosecond laser, an optical fiber amplifier and a Fabry-Perot cavity filter, wherein the all-solid femtosecond laser is used for generating a first laser pulse sequence with first repetition frequency, a component with selected wavelength is contained in the first laser pulse sequence, the optical fiber amplifier is used for amplifying power of the first laser pulse sequence, the working wavelength of the optical fiber amplifier comprises the selected wavelength, the Fabry-Perot cavity filter is used for carrying out filter on the first laser pulse sequence to output a second laser pulse sequence with second repetition frequency, and the second repetition frequency is larger than the first repetition frequency. The astronomical optical frequency comb device based on the all-solid femtosecond laser is mainly used for carrying out high-precision calibration on high-resolution astronomical spectrometers. Compared with a traditional calibration mode and an astronomical optical comb calibration mode based on an optical fiber laser, the astronomical optical frequency comb device based on the all-solid femtosecond laser has lower phase noise and side-mode suppression and enables the astronomical spectrometer to obtain higher radial velocity accuracy.

Description

technical field [0001] The invention relates to the field of ultrafast laser technology, in particular to an astronomical optical frequency comb device based on an all-solid-state femtosecond laser. Background technique [0002] In recent years, with the development of femtosecond laser technology, optical frequency combs based on femtosecond lasers have been widely used in precision spectroscopy, optical frequency standards, measurement of fundamental physical constants, and optical comb ranging. Especially in the field of astronomy, astronomers need a technology that can perform high-precision wavelength calibration for astronomical spectrometers in researches that require high-precision radial velocity, such as the detection of terrestrial planets and the measurement of the expansion velocity of the universe. A comb is one such suitable tool. [0003] Optical frequency combs can output a series of separated optical frequencies with the same longitudinal mode spacing, jus...

AI Technical Summary

Problems solved by technology

The advantage of the former is that the loss introduced by the F-P cavity can be easily compensated by amplification, so a two-stage F-P cavity filtering scheme can be used; the disadvantage is that the phase noise is relatively high

The advantage of the latter is that the phase noise is low; the disadvantage is that the power cannot be simply amplified, and a complex amplifying device must be used to amplify; and because the Ti:Sapphire laser used in the current astronomical optical frequency comb does not have an amplifying unit, it cannot use two-stage F-P Cavity filtering schemes resulting in very low power for astronomical optical frequency combs

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