Pretreatment method, device and method for laser cutting of narrow-band-pass optical filter

Abstract

The invention relates to the field of optical filter production, in particular to a pretreatment method and device and method for laser cutting of a narrow-band-pass optical filter. The method comprises the steps that S10, laser emitted by a laser device is subjected to beam expanding; S20, the expanded laser is shaped into a square flat-topped light beam; and S30, the square flat-topped light beam is focused on a surface optical thin film of a product after being reflected, so that the thin film of the product is stripped. Laser is expanded and then shaped into the square flat-topped light beam, and then the square flat-topped light beam is focused on the product, so that the stripping of the thin film of the product is realized. According to the pretreatment method and device and method for laser cutting of the narrow-band-pass optical filter, the thin film can be uniformly removed, so that the requirement for light transmission is met, and then the narrow-band-pass optical filter can be subjected to invisible cutting through laser. Not only is the processing quality of the narrow-band-pass optical filter effectively ensured, but also the processing efficiency can be further improved.

Description

technical field [0001] The invention relates to the field of optical filter production, in particular to a pretreatment method device and method for laser cutting narrow bandpass optical filters. Background technique [0002] In the bidirectional transceiver module of optical communication products, through the laser signal of selected wavelength, the reflection of unnecessary bands is usually realized by edge filters. It can be said that the filter plays a key role in optical communication products. It plays an important role and has a very broad market prospect. At present, laser cutting optical filters have two outstanding advantages compared with traditional grinding wheel cutter processing methods: high efficiency and small edge chipping. The laser light source is generally a picosecond laser with a waveband of 500-1100nm. The laser has high monochromaticity and the spectral width is within ±2nm of the central waveband. For filters that can pass visible light, the gre...

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Problems solved by technology

[0005] In order to solve the problem of poor quality of the laser-cut narrow band-pass filter mentioned above, the present invention provides a preprocessing method for laser-cut narrow band-pass filter, including step S10, expanding the laser beam emitted by the laser; S20, shaping the expanded laser beam into a square flat-hat beam; S30, focusing the square flat-hat beam on the surface optical film of the product after reflection, so as to peel off the film of the product

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