Method and system for controlling crystallization of sodium fluoride in PTR glass by using blue light and application thereof

A technology of sodium fluoride and sodium fluoride, which is applied in the field of sodium fluoride crystallization, can solve the problems of unstable refractive index modulation and affecting the performance of PTR glass, and achieve the effect of excellent performance and small grating period
CN112456515APending Publication Date: 2021-03-09SUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SUZHOU UNIV
Publication Date
2021-03-09

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Abstract

The invention discloses a method for controlling crystallization of sodium fluoride in PTR glass by using blue light. The method specifically comprises the following steps: while carrying out nucleation heat treatment on the PTR glass to form silver clusters, exposing the PTR glass by using the blue light to decompose sodium bromide particles with larger sizes and leave silver atom particles withsmaller sizes as nuclei for precipitation of sodium fluoride crystals; and therefore, the size of the precipitated sodium fluoride crystal is controlled. The invention also discloses an application ofthe method in preparation of the reflective volume Bragg grating. According to the method, the purpose of controlling the size of precipitated sodium fluoride can be achieved, so that the preparationof the reflective volume Bragg grating with a relatively short grating period is facilitated.
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Description

technical field

[0001] The invention relates to the field of advanced laser technology, in particular to a method, system and application for controlling the crystallization of sodium fluoride in PTR glass by using blue light. Background technique

[0002] Photothermorefractive (PTR) glass is an optically transparent photosensitive multicomponent silicate glass that exhibits photothermally induced precipitation of crystalline phases. That is, silver nanoclusters will be produced under ultraviolet irradiation, and NaF nanocrystals will be generated when heated, which will cause permanent refractive index changes, which is the basis for the production of Bragg gratings. Such gratings are widely used in advanced optical applications such as stabilization of laser diodes or spectral beam combining.

[0003] The nucleation and crystallization process of classic PTR glass is considered to be the following three steps:

[0004] (i) Exposure to UV (Ag + +Ce 3+ +hv→Ag 0 +Ce 4+ ...

Claims

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