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Tuning method for optic tunable filter

An optical filter and optical technology, applied in the field of optics and lasers, which can solve the problems of difficult control of coating surface shape accuracy and narrow bandwidth.

Active Publication Date: 2011-06-01
FUZHOU PHOTOP QPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of narrow bandwidth of traditional optical filter devices or difficult control of coating surface shape precision, the present invention proposes a tuning method for realizing broadband tunable optical filters

Method used

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  • Tuning method for optic tunable filter
  • Tuning method for optic tunable filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The refractive index or thickness of the optical plate is changed by changing the temperature field of the optical plate, thereby changing the optical path difference of the light in the optical plate, and realizing the tuning of the filter.

[0023] Due to the thermo-optic effect of the material, when the temperature field of the material is changed, the refractive index of the material will change, and the thickness of the material will also change with the temperature due to the effect of cold shrinkage and thermal expansion. Therefore, changing the temperature can change the amount of light in the plate The optical path difference within the etalon is realized, that is, the change of the effective cavity length of the etalon is realized, so as to realize the tuning of the filter. One of the ways to change the temperature is image 3 As shown, outside the ultra-thin optical parallel plate 101, a thermal energy radiation device 102 capable of radiating t...

Embodiment 2

[0024] Embodiment 2: The refractive index or thickness of the optical plate is changed by changing the electric field of the optical plate, thereby changing the optical path difference of the light in the optical plate, and realizing the tuning of the filter.

[0025] Due to the electrostrictive effect or inverse piezoelectric effect of the material, the thickness of the plate will change when the electric field of the material is changed, and the refractive index of the material will also change due to the electro-optic effect of the material, so the change of the electric field can play a role in tuning the etalon. effect. One of the ways to change the voltage is Figure 4 As shown in the figure, transparent conductive films 202 and 203 are respectively coated on the two optical surfaces of the ultra-thin optical parallel plate 201, and electrodes 204 are added on the conductive films, and the electric field of the optical plate can be changed by changing the electrode volta...

Embodiment 3

[0026] Embodiment 3: The optical filter is tuned by changing the refractive index of the optical plate by changing the magnetic field of the optical plate.

[0027] Some materials have magneto-optical effect, and their refractive index will change with the magnetic field. Therefore, these materials are made into an ultra-thin optical parallel plate 301, and by changing the magnetic field of the optical plate, the etalon can also be tuned. One of the ways to change the magnetic field is Figure 5 As shown, two inductors 302 and 303 are added to the two sides of the ultra-thin optically parallel flat plate 301 in directions perpendicular to the flat plate. By changing the currents of the two inductors, the magnetic field in the plate can be changed, and finally the filter can be tuned.

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Abstract

The invention discloses a tuning method for an optic tunable filter, wherein the optic tunable filter is a thin or ultrathin optic parallel plate and the tuning of the optic tunable filter is realized by changing the optical path difference of lights in the optic plate. The ultrathin optic parallel plate is a micron-level ultrathin plate, which is made of materials having a certain optical band and the refractive index or thickness of which can change following the change of temperature field, electric field or magnetic field; a better filtering property also can be achieved under the condition of being free from plating a high-reflectance coating, by utilizing the characteristics that the reflectance is high when the light enters into a natural optical surface in grazing incidence manner (theta is more than 80 degrees); and the ultrathin optic parallel plate also can be made of common materials, through which a certain optical band can permeate, and the tuning of the optic tunable filter can be realized by changing the incident angle of the light by rotating the plate. The invention designs a grazing incidence optic filter, aiming at the difficulty of plating film on the ultrathin plate, thereby solving the difficulty of plating film as well as realizing filtering the optical wave of full-transmission light.

Description

Technical field [0001] The invention involves the field of optics and laser, and especially involves a tuning method of adjustable filter. Background technique [0002] The adjustable filter can be used as a standard for optical fiber communication, and can also be used in the field of optical testing as adjustable laser.The traditional filter device is generally thicker to ensure that the reflective membrane is not easy to deform, so that the range of the bandwidth is narrow.In the field of optical fiber communication, 50nm-200nm bandwidth filter is often required. Among the adjustable laser, dozens to hundreds of nanometer bandwidth are often required, which often requires the standard for micron level thickness.On the coating of the micron -level thickness, the surface shape accuracy is difficult to control, which often results in the expected performance cannot be realized. Invention content [0003] In response to the problem that the traditional filtering device bandwidth ...

Claims

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Application Information

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IPC IPC(8): G02F1/01
Inventor 吴砺魏豪明贺坤任策
Owner FUZHOU PHOTOP QPTICS CO LTD
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