A method for calibrating wavelength of ultraviolet spectrometer

Abstract

The invention provides a method for calibrating the wavelength of an ultraviolet spectrograph. A 532 nanometer base frequency laser device, a frequency stabilization system, a frequency doubling system and a servo control system are mainly used in the method. The whole working process of a device comprises that the laser of the 532 nanometer base frequency laser device is divided into two channels through a light splitting element; one channel of the laser of the 532 nanometer base frequency laser device passes through the frequency stabilization system; the frequency stabilization system provides a stable reference frequency; if the frequency of base frequency laser deviates from the reference frequency, the frequency stabilization system can produce a feedback signal; the feedback signal passes through the servo control system, the cavity length of the base frequency laser device is adjusted, a 532 nanometer base light frequency is ensured to be always equal to the reference frequency provided by the frequency stabilization device, and the stability of a 532 nanometer laser frequency is guaranteed; the other channel of the laser of the 532 nanometer base frequency laser device passes through the frequency doubling system, so that 266 nanometer ultraviolet laser is generated; because the 532 nanometer light base frequency is stable, the frequency of 266 nanometer frequency doubled laser is also kept stable; after passing through an optically coupled system, the 266 nanometer ultraviolet laser enters the ultraviolet spectrograph, and then the ultraviolet spectrograph is calibrated.

Description

technical field [0001] The invention relates to a wavelength calibration method, in particular to a wavelength calibration method for an ultraviolet spectrometer. Background technique [0002] In the spectrum traceability system, the light wavelengths in the visible and near-infrared bands can be traced to atomic frequency standards, but the ultraviolet band is still in the research stage. At present, the calibration method of atomic spectral line lamps is mostly used in the world for ultraviolet wavelength calibration. The specific technical plan is: light the spectral standard lamp at a specified current (or voltage), preheat it within a specified time, and then turn on the standard lamp. The radiated light of the lamp is coupled to the ultraviolet spectrometer, and the wavelength indicated by the spectrometer is recorded and compared with the standard value of the spectral standard lamp. Since the spectral line energy of the low-pressure mercury lamp is too small, the tr...

AI Technical Summary

Problems solved by technology

[0009] In view of the above-mentioned shortcomings, the present invention establishes a set of ultraviolet standard wavelength source, the output wavelength of the wavelength source is stable and highly accurate, and can be traced to natural benchmarks and national standards, thereby effectively solving the problems existing in the existing ultraviolet spectrometer wavelength calibration method

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