Femtosecond laser carrier envelope offset frequency lock system based on heterodyne interferometric method

A technology of femtosecond laser and heterodyne interference, which is applied to lasers, laser components, phonon exciters, etc., to achieve the effect of simple structure and high locking accuracy

Active Publication Date: 2016-10-12
TSINGHUA UNIV
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Problems solved by technology

f-2f requires femtosecond laser spectral width to exceed one octave, and often requires the use of highly nonlinear optical fibers to perform spectral broadening pretreatment on the laser, which increases the complexity of the system and the difficulty of optical path construction; in addition, this method uses nonlinear The frequency doubling of t

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  • Femtosecond laser carrier envelope offset frequency lock system based on heterodyne interferometric method
  • Femtosecond laser carrier envelope offset frequency lock system based on heterodyne interferometric method
  • Femtosecond laser carrier envelope offset frequency lock system based on heterodyne interferometric method

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "first", "second" and so on are only used for the purpose of description, and should not be understood as indicating or implying relative importance.

[0019] Such as figure 1 As shown, the femtosecond laser carrier envelope offset frequency locking system based on heterodyne interferometry provided in this embodiment includes a femtosecond laser source system L, a polarizer P, three half-wave plates, an acousto-optic modulation AOM, two polarization beam splitters, a PID controller, four low-pass filters, three photodetectors, a mixer Mixer, two band-pass filters, a lock-in amplifier SX,...

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Abstract

The invention relates to a femtosecond laser carrier envelope offset frequency lock system based on a heterodyne interferometric method. The system is characterized by comprising a femtosecond laser light source system, an acousto-optic modulator, a controllable optical path retardation device, a light splitting prism, a first photoelectric detector, a phase lock amplifier, a phase difference voltage conversion device and a PID controller. Heterodyne interferometry can be conducted on first-level phase-shift diffraction light modulated by the acousto-optic modulator and zero-level diffraction light which is not modulated, and after mixing of interference signals with different wavelengths, direct-current level lock pulse envelope alignment is achieved; optical frequency comb envelope offset frequency is locked by means of interference signal phase, the linear process does not exist, high non-linear optical fibers, frequency doubling crystals and the like are not needed, and the system is simple in structure and low in requirement for laser energy.

Description

technical field [0001] The invention relates to a femtosecond laser carrier envelope offset frequency locking system based on heterodyne interferometry, and relates to the technical field of laser measurement. Background technique [0002] Femtosecond laser is a kind of ultrashort pulse laser, whose time-domain pulse width is in femtosecond (10 -15 s) order of magnitude. Since the birth of the femtosecond laser, due to its short pulse width, high peak power, and reliable connection between the optical frequency domain and the radio frequency domain, it has been extensively researched and applied. The fields involved include precision distance measurement, spectroscopy Measurement, frequency reference, astronomical spectral calibration, ultrafast process observation, femtosecond laser processing, etc. The femtosecond laser frequency comb is composed of equidistantly distributed comb-like spectral lines in the frequency domain, and the frequency corresponding to each spectra...

Claims

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Application Information

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IPC IPC(8): H01S3/13
CPCH01S3/1305
Inventor 张晓声胡明皓吴冠豪
Owner TSINGHUA UNIV
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