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An optical isolator capable of blocking all angles

An optical isolator and full-angle technology, which is applied in the optical field, can solve the problems of increasing the distance between split beams, increasing the cost, and increasing the volume of the crystal, so as to achieve the effect of improving isolation and dimensional accuracy.

Active Publication Date: 2022-05-17
福建海创光电技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This part of the returning light will cause the output power of the fiber laser to be unstable, and seriously damage the fiber laser
The existing solution is to increase the distance between the split beams, cooperate with the exit aperture and the entrance aperture, so that the returning light cannot return to the fiber collimator
However, increasing the distance between the split beams means that the volume of the crystal needs to be increased, and the volume of the magnet must also be increased accordingly, so that the cost of the product is also greatly increased, and it is not conducive to the direction of miniaturization and portability of the isolator. develop

Method used

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  • An optical isolator capable of blocking all angles
  • An optical isolator capable of blocking all angles
  • An optical isolator capable of blocking all angles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 or 2, which respectively show the schematic diagram of the isolator forward optical path and reverse optical path of the present embodiment; the present embodiment includes an input fiber collimator 111, an entrance diaphragm 112, a A beam splitter 113, optical rotator 114, magneto-optical crystals 116, 117, second beam splitter 118, light exit diaphragm 119 and beam expander collimation output optical system 120, wherein, the magneto-optic crystals 116, 117 are A pair is set up and down relative to each other and fixed together. Magnets 115 are arranged on the sides of the magneto-optic crystals 116, 117, and a barrier interface A11 is provided on the interface where the magneto-optic crystals 116, 117 are bonded to each other. The barrier interface A11 can Without affecting the forward light, it should be placed at a position where it can scatter or block the return light with a certain angle and not blocked by the entrance diaphragm 112 and the exit ...

Embodiment 2

[0037] Such as Figure 6 As shown, this embodiment is roughly the same as Embodiment 1, the difference is that in the optical path of the isolator, without affecting the forward light, a blocking block 221 made of transparent light material can be added; the blocking block The front and rear ends of 221 are coated with anti-reflection film, and the height of the blocking block 221 needs to be based on the premise of not affecting the forward light transmission. In addition, the blocking block 221 needs to be placed at a position where its upper surface can block returning light at a certain angle and not blocked by the entrance diaphragm 212 and the exit diaphragm 219 . The upper surface B11 of the blocking block 221 can be frosted or coated with a reflective film. In addition, if one blocking block 221 cannot block light from all angles, the number of blocking blocks 221 can be increased and placed in different positions. In this way, the returning light in the two cases ca...

Embodiment 3

[0041] The implementation structure of this embodiment is roughly the same as that of Embodiment 1, the difference is that the first beam splitter and the second beam splitter described in this embodiment use YVO4 or other birefringent crystals as polarizing beam splitters Placed in the optical path of the isolator in this embodiment, the scheme of dividing the optical crystal into upper and lower parts can also be used. For details, see Figure 8 As shown, it shows the YVO4 crystal as the reverse optical path of the isolator of the beam splitter. The optical rotation plates 314 and 315 in this scheme use quartz crystals. Under the condition of not affecting the forward light transmission, the quartz optical rotation plate 314 , 315 are divided into upper and lower two pieces, magneto-optic crystals 317, 318 are also divided into upper and lower two pieces. In this way, an interface C11 exists between the quartz optical plates 314 and 315 , and an interface C12 exists between...

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Abstract

The invention discloses an optical isolator capable of blocking all angles, which comprises an input fiber collimator, an entrance aperture, a first beam splitter, an optical rotation plate, a magneto-optical crystal, and a second beam splitter arranged in sequence , a light exit diaphragm and a beam expander collimation output optical system, magnets are provided on the side of the magneto-optic crystal, and a blocking interface for blocking return light is provided inside the magneto-optic crystal. The blocking interface scatters or blocks the return light with a certain angle and is not blocked by the light entrance diaphragm and the light exit diaphragm without affecting the forward light transmission, so as to avoid coupling into the fiber and causing damage to the laser. Realize the effect of working from all angles. In addition, the folded optical path can also be used to remove the reflective film in the area where the return light with a certain angle and not blocked by the entrance diaphragm and the exit diaphragm passes through the folded mirror, so that this part of the light passes through the mirror without being blocked. Reflections avoid coupling into the collimator and improve isolation over the full angular range.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an optical isolator capable of blocking all angles. Background technique [0002] The fiber laser used in the field of high-power laser processing, when the current fiber laser marks highly reflective materials, the light reflected at a specific small angle can still be coupled to the fiber through the isolator, causing abnormal marking. This part of the returning light will cause the output power of the fiber laser to be unstable, and seriously damage the fiber laser. The existing solution is to increase the distance between the split light beams, cooperate with the exit aperture and the entrance aperture, so that the returning light cannot return to the fiber collimator. However, increasing the distance between the split beams means that the volume of the crystal needs to be increased, and the volume of the magnet must also be increased accordingly, so that the cost of the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/09
CPCG02F1/093
Inventor 鲍日焰杨建阳张其盛张哨峰
Owner 福建海创光电技术股份有限公司
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