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Optical isolator

An optical isolator and optical axis technology, applied in the field of optical isolators, can solve the problems of long optical path and small Verdet constant, and achieve the effect of improving magnetic flux density and reducing optical loss

Inactive Publication Date: 2014-11-12
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, lead-containing glass has a small Verdet constant at a wavelength of 320nm to 800nm, and if it is used as a Faraday rotator, the optical path will become longer

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0101] make figure 1 405nm wavelength band optical isolator of the structure shown.

[0102] As the incident polarizer 1 and the outgoing polarizer 6, α-BBO crystals (BaB 2 o 4 ), its light-transmitting surface is processed into a parallel flat plate with a thickness of 1.0 cm, and its optical axis 11 is inclined 47.8 degrees relative to the optical axis 12. figure 1 In , it is drawn so that the oblique direction is located in the center of the paper. Furthermore, the flat polarizer is provided with an anti-reflection film with a central wavelength of 405nm on the light-transmitting surface, and in order to prevent the reflected light from the light-transmitting surface from returning to the incident light path, the bottom surface of the polarizing element is adhered and fixed on a surface with an inclination angle of only 5 degrees. Wedge glass 2, and mounted on the polarizer fixing frame 3.

[0103] Moreover, the Faraday rotator 4 is positioned at the center of the hollo...

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Abstract

It is an object to provide a small-sized optical isolator that is suitable as an optical isolator used in a semiconductor laser used in applications such as medical treatment or optical measurement The optical isolator for a wavelength band of 320 to 633 nm of the present invention comprises a Faraday device having a Verdet constant at a wavelength of 405 nm of at least 0.70 min / (Oe·cm), and a first hollow magnet disposed on the outer periphery of the Faraday device and second and third hollow magnet units disposed so as to sandwich the first hollow magnet on the optical axis, the second and third hollow magnet units comprising 2 or more magnets equally divided in a direction of 90 degrees relative to the optical axis, the Faraday device having applied thereto a magnetic flux density B (Oe) within the range of Expression (1) below, and a sample length L (cm) on which the Faraday device is disposed being within the range of Expression (2) below. 0.8 × 10 4 ‰¤ B ‰¤ 1.5 × 10 4 0.25 ‰¤ L ‰¤ 0.45

Description

technical field [0001] The present invention relates to an optical isolator used in a wavelength band of 320nm to 633nm. Background technique [0002] Conventionally, for industrial lasers (lasers) used in medical treatment, optical measurement, etc., semiconductor lasers using ultraviolet (UV) and visible regions or lamp (lamp) excited Yttrium Aluminum Garnet (Yttrium Aluminum Garnet) are used. , YAG) the second harmonic (532nm) and the third harmonic (355nm) of the laser. [0003] In recent years, the use of the wavelength of this semiconductor laser has also become wider, and it is advancing toward higher output. [0004] However, in general, semiconductor lasers have the characteristics of narrow emission spectrum and excellent conversion efficiency, but on the contrary, they are very sensitive to return light caused by reflected light. When the reflected light from the measurement object returns, there is a danger that the characteristics will become unstable. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/28
CPCG02B27/281H01S5/0064G02F1/093H01F7/0273
Inventor 矢作晃渡边聪明牧川新二
Owner SHIN ETSU CHEM IND CO LTD
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