Device and method for laser phase-locked frequency stabilization based on iodine molecular filter

Abstract

The invention relates to a laser phase locking frequency stabilizing device based on an iodine molecule filter. The laser phase locking frequency stabilizing device comprises a single-frequency laser source, a microwave driver, a phase modulator, the iodine molecule filter, a positive lens, a photoelectric detector and a data processor. 532 nm light output by a single-frequency laser is subjected to electro-optic phase modulation, frequency error signals are formed on the data processor through the iodine molecule filter, the data processor feeds back voltage signals, by changing the cavity length of the single-frequency laser source, laser frequency is stabilized at the iodine molecule absorption valley bottom or peak frequency, and the device has the advantages of being compact in structure, simple in light path, low in light power requirement and high in frequency stabilizing accuracy.

Description

technical field [0001] The invention belongs to the technical field of laser frequency stabilization, and in particular relates to a laser phase-locked frequency stabilization device and method based on an iodine molecular filter. Background technique [0002] Inspired by Pound's microwave frequency stabilization technology in 1983, PDH technology was proposed by Ronald Drever and Johh L. Hall et al. A device that uses FPI as a frequency reference and uses phase modulation spectroscopy technology to stabilize laser frequency. [0003] In the process of hyperspectral measurement of aerosol, the laser frequency needs to be stabilized at the center of the absorption line of iodine molecules, so as to ensure a high suppression ratio of aerosol signals. Generally, at the bottom of the absorption valley of iodine molecules, the transmittance changes little with frequency, and the accuracy of direct frequency stabilization at the order of 100 MHz does not meet the demand. Some pee...

AI Technical Summary

Problems solved by technology

Generally, at the bottom of the absorption valley of iodine molecules, the transmittance changes little with frequency, and the accuracy of direct frequency stabilization at the order of 100 MHz does not meet the demand.

Some peers use saturated absorption to stabilize the frequency. Although the frequency stabilization accuracy meets the requirements, the input optical power required for frequency stabilization is relatively large, and a part of the laser power needs to be separated to ensure the saturation of the absorption line. Therefore, the system is complicated and wastes the detection time. Optical power

Images