Laser wavelength real-time measurement device

Abstract

The invention provides a laser wavelength real-time measurement device. The real-time measurement device comprises a reference laser, a laser to be measured, a first polarization splitting prism, a non-polarizing splitting prism, a multi-path photoelectric detection element and an electrical testing system, wherein the reference laser emits a reference laser with a specific wavelength; the laser to be measured emits a laser to be measured; the first polarization splitting prism performs polarization splitting to the reference laser and the laser to be measured, the split light beam is reflected back to the first polarization splitting prism by a cube-corner prism; the non-polarizing splitting prism is used to divide the reference laser or laser to be measured, which is emitted from the first polarization splitting prism, to two light beams in the same state; the two light beams pass through a polarization splitting prism for polarization splitting; the multi-path photoelectric detection element detects the light beam split by the polarization splitting prism; and the electrical testing system is used to determine the phase of the laser to be measured and the transient laser wavelength value according to the measurement signal of the multi-path photoelectric detection element. The high-precision real-time wavemeter is unique and novel in the principle of measurement, the systemhardware composition is changed and improved, the utilization efficiency of the laser power can be increased and the anti-interference capability of the wavemeter is improved.

Description

technical field [0001] The present invention relates to a wavelength measurement device, more specifically, to a measurement device for real-time detection and verification of the wavelength of a laser to be measured by utilizing the Michelson interference principle. Background technique [0002] As the reference value of measurement, laser wavelength is widely used in the measurement of various physical quantities such as length, angle, speed, flatness, straightness and verticality. Accurate measurement of wavelength size and stability is the key to ensure measurement accuracy and value traceability. [0003] For lasers with variable wavelengths, such as tunable semiconductor lasers, their output wavelength cannot be determined in advance when they are used. Specifically, tunable lasers can use their tuning structures to adjust their output light in a wide range of wavelengths. wavelength, while semiconductor lasers change their operating parameters, the wavelength of the ...

AI Technical Summary

Problems solved by technology

In the optical path structure of the traditional Michelson-type wavelength meter, the effective utilization rate of the beam is low, and the signal-to-noise ratio of the interference signal is low. The wavelength value is measured by changing the number of fringes of the interference fringe, and the measurement accuracy is relatively low, and There is a problem that the phase and wavelength values ​​of the laser wavelength cannot be obtained in real time

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