A device and method for measuring the FSR of a multi-longitudinal-mode laser resonator by using a large-amplitude laser self-mixing vibration signal
A vibration signal and laser technology, applied in the field of lasers, can solve the problems of unsuitable measurement methods for monitoring FSR, high price, low measurement accuracy, etc., and achieves non-contact real-time high-precision measurement, convenient adjustment of the optical path, and high measurement accuracy. Effect
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[0059] combine Figure 1 to Figure 5 , which describes a specific embodiment of the present invention in detail, but does not limit the claims of the present invention in any way.
[0060] Self-mixing interferometry is a precision measurement technology, which is used for highly sensitive and precise non-contact measurement due to its simple structure, compactness and easy alignment. This technology has been widely researched and applied, mainly in the sensing and measurement of physical quantities related to object motion (such as vibration, displacement, velocity and stress, etc.) and laser-related parameters (such as: line width broadening factor α and feedback level factor C) Measurement etc.
[0061] A laser generally consists of an optical resonator, a gain medium, and an excitation source. The free spectral region of the laser resonator is defined in the same way as the free spectral region of the FP cavity etalon, and FSR is generally represented by Δν. The FSR expr...
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