Optical probe with self-reference optical fibers

Abstract

The invention relates to the field of optical signal detection and provides an optical probe with self-reference optical fibers. The optical probe comprises a power supply, a laser diode, a lens I, an input optical fiber, a probe body, an input lens, an optical filter, a dichroic glass filter, a lens II, a sapphire optical fiber, a Raman optical filter, a lens III, an output optical fiber and a spectrometer, wherein the upper end of the sapphire optical fiber can be connected with or separated from the probe body; the lower end of the sapphire optical fiber can get close to the surface of a sample; the lower end of the sapphire optical fiber can be in contact with the sample when the probe works in a contact mode so that a heat conducting capability of the sapphire optical fiber is developed and the laser heating effect on the sample is reduced; when laser irradiation is stimulated, Raman light and exciting laser, which are emitted from the sample and the sapphire optical fiber, are transmitted oppositely and are collimated by the lens II; the reflected or diffused exciting laser is filtered through the Raman optical filter and is focused into the output optical fiber through the lens III; then the exciting laser enters the spectrometer so that the Raman light which enters the spectrometer and is emitted by the Raman optical filter is enhanced and light collection time is shortened.

Description

technical field [0001] The invention relates to the technical field of optical signal detection, in particular to an optical probe with a self-reference optical fiber which can be very close to the sample surface and shorten the light collection time in experiments. Background technique [0002] In all spectroscopic techniques, the quantitative measurement of the intensity of the detected light requires a reference intensity, since the intensity of the detected signal depends on a series of factors such as the power of the excitation laser beam incident on the sample, the sample The geometry of the illumination, the coupling of the emission from the sample to the spectrometer, the detection efficiency of the spectrometer, etc., are often not easy to determine. The main difficulty at present lies in the fiber optic measurement system, because the signal often changes, even due to the movement of the input and output ends of the fiber. [0003] When light is irradiated on a s...

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Problems solved by technology

[0006] In order to solve the above-mentioned problems, the object of the present invention is to change the fact that the sapphire window in the prior art is located in the probe and cannot be in contact with the sample, and cannot exert its thermal conductivity, thereby solving the above-mentioned problems

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