Preparation method of chalcogenide glass infrared gradient refractive index optical lens
A gradient refractive index and optical lens technology, which is applied in the field of infrared lenses, can solve the problems that the refractive index gradient cannot be continuously changed, it is difficult to controllably prepare the GRIN structure, the large refractive index gradient and the large-sized sample, etc., and the development cycle can be shortened. , Overcome the effect of shallow diffusion depth and high controllability
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Embodiment 1
[0038] This embodiment provides a method for preparing a chalcogenide glass infrared gradient index optical lens, such as figure 1 , figure 2 and image 3 As shown, the method includes the steps of:
[0039] S1: According to the GRIN lens, select the first component glass and the second component glass to form the matrix glass powder, and the refractive index difference between the first component glass and the second component glass is the maximum refractive index difference corresponding to the GRIN lens;
[0040] S2: crushing and grinding the matrix glass powder under vacuum conditions or under the protection of the atmosphere; ball milling and mixing the glass powders of the first component glass and the second component glass according to different proportions to obtain multiple powder groups with gradually changing refractive indices;
[0041] S3: Spread multiple powder groups on the mold in sequence according to the refractive index and compact them;
[0042] S4: Pu...
Embodiment 2
[0065] refer to Figure 4 , to prepare chalcogenide glass infrared gradient index optical lens, and prepare chalcogenide glass material by melt cooling method. The selected chalcogenide glass components are Ge-As-Se and Ge-As-Se-S. The obtained matrix glass powder was ground in a grinding bowl for 3 hours to make the powder particles smaller than 1 μm. Then mix Ge-As-Se powder and Ge-As-S powder uniformly in proportion to obtain four groups of powders: pure Ge-As-Se; 40% Ge-As-Se: 60% Ge-As-S, 60 %Ge-As-Se: 40% Ge-As-S and pure Ge-As-S. Each group of powders has the same volume and calculates its mass size, and spreads them in the mold sequentially. Put it into a hot press to draw a vacuum while raising the temperature to 260°C at 10°C / min, and keep the pressure at 30MPa; remove the pressure after 45min and keep it warm for 300 minutes; then turn off the heating and let it cool naturally.
[0066] In the method, the cooled glass is taken out and ground, and then cut to for...
Embodiment 3
[0068] refer to Figure 4 , Figure 5 and Figure 6 , with the axial glass prepared in Example 2, use a glass cutting machine according to the following Figure 4 Diagonal cut shown, cut into triangular-sided blocks, ground and polished. After completion, take small pieces with consistent refractive index distribution and splice them into radial polygonal (approximately circular) glass blocks such as Figure 5 Therefore, a radially graded body is formed. The spliced glass is put into a custom mold and then pressed, so that each piece of glass can be sintered together to obtain a radial gradient lens. Put the obtained green body into a hot press to evacuate while raising the temperature to 260°C at 10°C / min, and keep the pressure at 30MPa; remove the pressure after 10min; then turn off the heating and let it cool naturally.
[0069] In this method, the cooled glass is taken out and polished, and then cut to form a chalcogenide glass with a radial refractive index gradien...
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