Broadband temperature tuning filter with air gap etalon structure

A technology for tuning filters and etalons, applied in instruments, optical components, optics, etc., can solve problems such as difficult bonding, and achieve the effect of satisfying parallelism and reasonable design

Inactive Publication Date: 2020-07-31
FUZHOU OPTOWIDE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the difference in the thermal expansion coefficient of the material, the cavity length of the air-gap etalon changes with the temperature, resulting in a change in the central wavelength. The F-P etalon has a high requirement on the parallelism of the cavity surface. The interface must be a bonding surface to meet the requirements of parallelism. If two materials with different thermal expansion coefficients are directly selected to make an adjustable filter for temperature tuning, if the difference in thermal expansion coefficient is too large, the bonding surface of the two materials will be difficult to bond.

Method used

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  • Broadband temperature tuning filter with air gap etalon structure
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  • Broadband temperature tuning filter with air gap etalon structure

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Experimental program
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Effect test

Embodiment 1

[0027] see Figures 3 to 5 , a wide-band temperature-tuned filter with an air-gap etalon structure, including an air-gap etalon, the air-gap etalon is composed of H-K9 and a quartz crystal, the quartz crystal is a hexagonal crystal structure, isotropic Anisotropic uniaxial crystals have anisotropic thermal expansion, and the thermal expansion coefficient of the quartz crystal: ||C: 7.97x10-6 / °C; ⊥C: 13.3x10-6 / °C@0°-80°°C, optional The surface of the quartz crystal parallel to the c-axis is the bonding surface, and the expansion and contraction direction is perpendicular to the c-axis when the temperature changes. The H-K9L is an optical glass, an isotropic material, and the thermal expansion coefficient is 7.6E-6 / °C.

[0028] Among them, the design parameters include:

[0029] The a-axis thermal expansion coefficient of quartz crystal is 13.3E-6 / ℃, 1.88mm;

[0030] H-K9L thermal expansion coefficient is 7.6E-6 / ℃, 1.8548mm;

[0031] 25℃, air gap 25.2um, FSR47.67nm, R90.0%, F...

Embodiment 2

[0041] see Figure 6-8 , a broadband temperature-tuned filter with an air-gap etalon structure, including H-K9 and Brofloat33;

[0042] Among them, the design parameters include:

[0043] H-K9L thermal expansion coefficient is 7.6E-6 / ℃, 2.5mm;

[0044] Brofloat33 thermal expansion coefficient is 3.25E-6 / ℃, 2.4748mm;

[0045] 25℃, air gap 25.2um, FSR47.67nm, R90.0%, FWHM201.16G;

[0046] The variation of cavity thickness per degree Celsius = 7.6E-6x2.5-3.25E-6x2.4748mm = 1.1E-5mm = 11nm;

[0047] 95°C, air gap 25.97um, FSR46.25nm, FWHM195.19G.

[0048] Design steps include:

[0049] Step 1. Throw Brofloat33 parallel flat sheets 11 and 12 with surface shape <1 / 20@633nm, parallelism <1 second, width 1.8mm, thickness 1.237mm, and the total thickness of the two pieces is 2.475mm;

[0050] Polished H-K9 wedge angle piece 13, 14 surface shape <1 / 10@633nm, wedge angle 30+ / -1 minute, width 3mm, thickness 0.71mm;

[0051] Polished H-K9 parallel flat plate 15, 16 surface shape 1 / 1...

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Abstract

The invention discloses a broadband temperature tuning filter with an air gap etalon structure. The broadband temperature tuning filter comprises an air gap etalon. The air gap etalon is formed by combining H-K9 and a quartz crystal, and the quartz crystal is used as a spacer block material of the H-K9. The broadband temperature tuning filter has the advantages that the anisotropism characteristicof thermal expansion of the quartz crystal is used as a spacer block to achieve temperature tuning of the cavity thickness, two isotropic materials are selected as the second material combination, the thermal expansion coefficient difference of the two isotropic materials is within 5E-6, and the temperature tuning air gap etalon is manufactured in cooperation with a special bonding film.

Description

technical field [0001] The invention relates to an air-gap etalon structure, in particular to a wide-band temperature tuning filter with an air-gap etalon structure, and belongs to the technical field of the optical communication industry. Background technique [0002] The etalon is a filter made by the multi-beam interference mechanism of the Fabry-Perot cavity, that is, two parallel planes form an interference cavity to play the effect of a filter, and two structures are formed due to different cavity media. The cavity medium is Air is called an air-gap etalon, and the cavity medium is called a solid etalon of optical glass. The air-gap etalon usually uses a glass-ceramic cavity pad with zero expansion coefficient, and the fused quartz material is selected as the cavity mirror. Due to the thermal expansion of the fused quartz material The thermal expansion coefficient of 5.3E-7 / ℃ and glass-ceramic 1E-8 / ℃ has little difference, the structure is stable after bonding, and a f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/28
CPCG02B5/284
Inventor 王启平颜贻崇刘俊智杨振庭何锋
Owner FUZHOU OPTOWIDE TECH CO LTD
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