Double-optical frequency comb optical imaging method based on continuous frequency stabilized laser

Abstract

The invention discloses a double-optical frequency comb optical imaging method based on a continuous frequency stabilized laser. According to the optical imaging method, two optical frequency comb seed resources are locked onto a stable outside atomic clock through a repetition frequency control module, meanwhile, an electric signal which has optical comb frequency instability is extracted through interaction between the continuous frequency stabilized laser and the laser output by the two optical frequency comb seed resources, radio-frequency signal power distribution and processing are conducted on the electric signal, a part of the electric signal is directly used for feedback control of the laser resonator character of the two optical frequency comb seed resources so as to stabilize the output carrier envelope phase frequency of a semiconductor laser unit, the other part of the electric signal is used for being mixed with a periodical interference spectrum signal generated by a double-optical comb imaging system so as to further counteract the frequency variations of the optical comb system, and therefore the measurement precision of the whole double-optical comb imaging system is controlled from two aspects and quick and super-high-resolution optical comb coherent imaging is achieved.

Description

technical field [0001] The invention belongs to the technical field of ultrafast lasers, in particular to a dual optical frequency comb optical imaging method based on continuous frequency-stabilized lasers. Background technique [0002] The development of optical microscopic imaging technology has a long history, and it has been continuously improved along with the deepening of human exploration of the microcosm. As early as the first century BC, people discovered that water droplets could be used to observe the magnified image of an object. The spatial resolution of traditional optical imaging systems is limited by the diffraction limit. Generally speaking, the spatial resolution limited by the diffraction limit of optical imaging systems is about half of the wavelength of the probe light. For object details smaller than this imaging limit, traditional optical systems will powerless. In the 1980s, the emergence of non-optical scanning probe microscopy, especially atomic ...

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Problems solved by technology

However, the detection and control process of the phase drift frequency of the optical comb carrier envelope due to the difference between the group velocity and the phase velocity during the pulse propagation process is relatively complicated. Usually, it is necessary to perform power amplification and spectral broadening on the output light of the optical comb, and then use a common linear or non-collinear f-2f Perform optical frequency doubling and optical beam combining beat frequency from the reference optical system, and extract the carrier envelope phase drift frequency

In the above-mentioned process, not only the dispersion characteristics and polarization state of the pulse need to be well controlled, but also the temperature of the nonlinear crystal, the phase matching degree of the entire optical system, and the adjustment accuracy and stability of the optical path all have higher requirements. Requirements, these will undoubtedly have a negative impact on the application and promotion of optical frequency comb technology

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