CN207937717U

CN207937717U - A kind of optoisolator of high dynamic isolation

Info

Publication number: CN207937717U
Application number: CN201820341835.7U
Authority: CN
Inventors: 张哨峰; 林平; 鲍日焰
Original assignee: Fujian Haichuang Electronic Co Ltd
Current assignee: Fujian Haichuang Photoelectric Technology Co.,Ltd.
Priority date: 2018-03-13
Filing date: 2018-03-13
Publication date: 2018-10-02
Anticipated expiration: 2028-03-13

Abstract

The utility model discloses a kind of optoisolator of high dynamic isolation, it includes sequentially input optical fibre collimator, enter light diaphragm, first PBS beam splitters, 45 ° of optical rotation plates, magneto-optical crystal, magnet, 2nd PBS beam splitters, light extraction diaphragm, beam-expanding collimation optic system for outputting, magnet ring is set to the peripheral side of magneto-optical crystal, it is additionally provided with return diaphragm in light path between first PBS beam splitters and the 2nd PBS beam splitters, wherein, the laser polarization beam splitting and close beam that two PBS beam splitters are used to input optical fiber collimator, using to using laser low absorption coefficient material to form, reduce the absorption to laser, reduce the influence of thermal lens and thermally induced birefringence, improve the isolation under the beam quality and high power of optical fiber laser output.

Description

A kind of optoisolator of high dynamic isolation

Technical field

The utility model is related to optical technology and device field, especially a kind of optoisolator of high dynamic isolation.

Background technology

The optical fiber laser used at present in high power laser light manufacture field, its optoisolator are usually used Beam splitter is all made of the YVO4 crystal of cuboid, and by incident light polarization beam splitting and beam is closed using the birefringence principle of crystal, Positive thang-kng and reverse isolation are realized by the effect of optically-active part again, structure is substantially as shown in Fig. 1 to one of 3, substantially Including be sequentially arranged input optical fibre collimator 111, enter light diaphragm 112, the first YVO4 crystal 113,114,45 ° of return diaphragm Optical rotation plate 115, magneto-optical crystal 116, magnet 117, the 2nd YVO4 crystal 118, light extraction diaphragm 119 and beam-expanding collimation export optical system System 120, wherein incident light could be divided into the linear polarization of two beams separation by being typically necessary the YVO4 crystal of 10mm or more length Light, and YVO4 crystal has laser certain absorption, absorptivity to be generally 5000 ~ 10000ppm/cm, under high power use, Absorption of crystal generates heat, and generating fuel factor influences the quality of output beam, and thermally induced birefringence can reduce isolation, limit high power The application of laser processing.

For optical fiber laser for mark, cutting etc., return light can not possibly be completely along input path backtracking, in diaphragm In the range of limitation, the light within the scope of certain cone angle can return inside isolator, which is stopped by diaphragm, no Optical fiber can be returned.But the light of some special angles, dotted line P light as shown in Figure 2 and S light shown in Fig. 3 can by diaphragm into Enter optical fiber, cause isolation bottom, here it is so-called dynamic isolation degree.The return light in this part can cause the output of optical fiber laser Power is unstable, serious to damage optical fiber laser, it is therefore desirable to solve the problems, such as this.And use YVO4 as beam splitter, two beams The vertical parallel output of return light of polarization, as shown in Fig. 2, P light can be stopped by return diaphragm 114, but special angle Return smooth S light can return optical fiber Chong Die with positive S light light path, can not be isolated, as shown in Figure 3.Existing solution is to use to add Spacing between big light splitting light beam, coordinates light extraction diaphragm and enters light diaphragm, make return light that can not return to optical fiber collimator.But it increases The spacing being divided between light beam, it is meant that need to lengthen the length of YVO4 beam splitters, while the clear field of all crystal is both needed to It increases, as a result, as crystal is more serious to the absorption of laser, output beam quality is caused to be deteriorated, isolation reduces, together Shi Chengben increases.

Invention content

The case where for the prior art, the purpose of this utility model is to provide a kind of the optically isolated of high dynamic isolation Device utilizes the material property and light splitting optical path of PBS, reduces the influence of thermal lens and thermally induced birefringence, improves optical-fiber laser Isolation under the beam quality and high power of device output, improves the dynamic isolation degree of isolator.

In order to realize that above-mentioned technical purpose, the technical solution adopted in the utility model be：

A kind of optoisolator of high dynamic isolation comprising the input optical fibre collimator that is sequentially arranged enters light diaphragm, One PBS beam splitters, 45 ° of optical rotation plates, magneto-optical crystal, magnet, the 2nd PBS beam splitters, light extraction diaphragm and beam-expanding collimation export optics System, the magnet ring is set to the peripheral side of magneto-optical crystal, between the first PBS beam splitters and the 2nd PBS beam splitters Light path on be additionally provided with return diaphragm.

Further, the first PBS beam splitters and the 2nd PBS beam splitters be the identical PBS optical cements of two panels parameter and It is mutually parallel at and through the polarizing coating of two panels PBS after optical cement.

Further, the first PBS beam splitters and the 2nd PBS beam splitters are the material of low absorption coefficient to using laser Material molding.

Preferably, the laser that the first PBS beam splitters and the 2nd PBS beam splitters are used to input optical fiber collimator into Row polarization beam splitting and conjunction beam.

Further, the return diaphragm is laser absorption body or laser reflector.

Using above-mentioned technical solution, the utility model compared to the prior art, have the advantage that for：This practicality The novel structure by changing beam splitter reduces the absorption to laser, drop using to using laser low absorption coefficient material to form The influence of low-heat lens and thermally induced birefringence improves the isolation under the beam quality and high power of optical fiber laser output； Wherein, in the first PBS beam splitters, the 2nd PBS beam splitters and under going out, entering the limitation of diaphragm, the return light of certain angle is carried, only P light is possible to return to input optical fibre；In addition, it is set to the return diaphragm between the first PBS beam splitters, the 2nd PBS beam splitters, In the case where not influencing positive thang-kng, certain angle will be carried, and is not entered the return P light of light diaphragm and the blocking of light extraction diaphragm Blocking, improves the dynamic isolation degree of isolator.

Description of the drawings

The utility model is further elaborated With reference to embodiment：

Fig. 1 is the isolator reverse optical path schematic diagram using YVO4 beam splitters；

Fig. 2 is the isolator band angle P light reverse optical path schematic diagrames using YVO4 beam splitters；

Fig. 3 is the isolator band angle S light reverse optical path schematic diagrames using YVO4 beam splitters；

Fig. 4 is the isolator forward direction light path schematic diagram that the utility model uses PBS beam splitters；

Fig. 5 is the isolator reverse optical path schematic diagram that the utility model uses PBS beam splitters；

Fig. 6 is isolator band angle P light reverse optical path schematic diagram of the utility model using PBS beam splitters；

Fig. 7 is isolator band angle S light reverse optical path schematic diagram of the utility model using PBS beam splitters.

Specific implementation mode

Fig. 4 is the isolator forward direction light path schematic diagram that the utility model uses PBS beam splitters comprising what is be sequentially arranged is defeated Enter optical fiber collimator 211, enter light diaphragm 212, the first PBS beam splitters 213, return diaphragm 214,45 ° of optical rotation plates 215, magneto-optics Crystal 216, magnet 217, the 2nd PBS beam splitters 218, light extraction diaphragm 219 and beam-expanding collimation optic system for outputting 220, wherein institute The magnet ring stated is set to the peripheral side of magneto-optical crystal, and the first PBS beam splitters 213, the 2nd PBS beam splitters 218 are two Piece PBS gluings form, in addition, the polarizing coating of two panels PBS is all for 45 ° and parallel with the angle of incident ray.

Enter light diaphragm 212 described in passing through when incident light and enter the first PBS beam splitters 213, by the first PBS points First polarizing coating of beam device 213 is divided into the direction of propagation P light parallel with incident light and the S light vertical with incident light, and S light passes through The direction of propagation is parallel with incident light and P light after second polarizing coating reflection of the first PBS beam splitters 213, P light and S light warp After crossing 45 ° of optical rotation plates 215, polarization direction is simultaneously toward being rotated clockwise 45 degree, and two-beam is using magneto-optical crystal 216 Afterwards, polarization direction is past again simultaneously has been rotated clockwise 45 degree, therefore P light becomes S ' light, and S light becomes P ' light, S ' light The direction of propagation is still parallel with P ' light after the first polarizing coating of the 2nd PBS beam splitters 218 and the reflection of the second polarizing coating, and Polarization direction is orthogonal, merges into light beam and is emitted from the 2nd PBS beam splitters 218, most afterwards through passing through light extraction diaphragm 219, it is exported through 220 beam-expanding collimation of beam-expanding collimation optic system for outputting.

Fig. 5 is the isolator reverse optical path schematic diagram that the utility model uses PBS beam splitters, the input light sequentially shown Fine collimator 211 enters light diaphragm 212, the first PBS beam splitters 213, return diaphragm 214,45 ° of optical rotation plates 215, magneto-optical crystals 216, magnet 217, the 2nd PBS beam splitters 218, light extraction diaphragm 219 and beam-expanding collimation optic system for outputting 220 are identical as Fig. 4.

When light from light extraction diaphragm 219 enter, propagation side is divided by first polarizing coating of the 2nd PBS beam splitters 218 To the P light parallel with incident light and the S light vertical with incident light, S light passes through second of the 2nd PBS beam splitters 218 partially The direction of propagation is parallel with incident light and P light after vibrating diaphragm reflection, and after magneto-optical crystal 216, polarization direction is past simultaneously for P light and S light 45 degree, after two-beam is using 45 ° of optical rotation plates 215 are counterclockwise had rotated, polarization direction is revolved toward clockwise direction simultaneously again 45 degree are turned, P light is still P light, and S light is still S light.P light is directly saturating by the first polarizing coating of the first PBS beam splitters 213 Being shot out will not enter into light diaphragm 212；S light propagation side after the reflection of the second polarizing coating of the first PBS beam splitters 213 It will not vertically enter into light diaphragm 212 to incident light, cannot be introduced into input optical fibre collimator 211, play reversed optically isolated Effect.

Fig. 6 is isolator band angle P light reverse optical path schematic diagram of the utility model using PBS beam splitters, is sequentially shown The input optical fibre collimator 211 that goes out enters 214,45 ° of light diaphragm 212, the first PBS beam splitters 213, return diaphragm optical rotation plates 215, magneto-optical crystal 216, magnet 217, the 2nd PBS beam splitters 218, light extraction diaphragm 219 and beam-expanding collimation optic system for outputting 220 It is identical as Fig. 4.

Although by light extraction diaphragm 219 and entering light diaphragm 212 and being limited, the return light of wide-angle can not return to optical fiber collimator 211, but the return light of P light under specific low-angle can enter optical fiber collimator after isolator optical element by entering light diaphragm 212 211, optically isolated purpose can not be played, return diaphragm 214 is added in specific position thus, P light reflections can be absorbed, it can not Optical fiber collimator 211 is returned to, it is return optically isolated to play full angle, improves dynamic isolation degree.

Fig. 7 is isolator band angle S light reverse optical path schematic diagram of the utility model using PBS beam splitters, is sequentially shown The input optical fibre collimator 211 that goes out enters 214,45 ° of light diaphragm 212, the first PBS beam splitters 213, return diaphragm optical rotation plates 215, magneto-optical crystal 216, magnet 217, the 2nd PBS beam splitters 218, light extraction diaphragm 219 and beam-expanding collimation optic system for outputting 220 It is identical as Fig. 4.

Wherein, the return light of S light of specific low-angle is sequentially after the optical element of the utility model isolator, into positive light P light light paths, but through the first PBS beam splitters 213, specific low-angle is amplified by two secondary reflections, and deviation comes in and goes out light diaphragm 212, nothing Method enters optical fiber collimator 211, and it is return optically isolated to play full angle, improves dynamic isolation degree.

Specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only to lift Example explanation, those skilled in the art without departing from the principle and essence of the present invention, can do this embodiment Go out various changes or modifications, but these change and modification each fall within protection scope of the present invention.

Claims

1. a kind of optoisolator of high dynamic isolation, it is characterised in that：It includes the input optical fibre collimator being sequentially arranged, enters Light diaphragm, the first PBS beam splitters, 45 ° of optical rotation plates, magneto-optical crystal, magnet, the 2nd PBS beam splitters, light extraction diaphragm and beam-expanding collimation Optic system for outputting, the magnet ring are set to the peripheral side of magneto-optical crystal, and the first PBS beam splitters and the 2nd PBS divide Return diaphragm is additionally provided in light path between beam device.

2. a kind of optoisolator of high dynamic isolation according to claim 1, it is characterised in that：First PBS Beam splitter and the 2nd PBS beam splitters are that the identical PBS optical cements of two panels parameter form and the polarizing coating of two panels PBS after optical cement It is mutually parallel.

3. a kind of optoisolator of high dynamic isolation according to claim 1, it is characterised in that：First PBS Beam splitter and the 2nd PBS beam splitters are to using the material that laser is low absorption coefficient to be molded.

4. a kind of optoisolator of high dynamic isolation according to claim 3, it is characterised in that：First PBS Beam splitter and the 2nd PBS beam splitters are used to carry out polarization beam splitting to the laser that optical fiber collimator inputs and close beam.

5. a kind of optoisolator of high dynamic isolation according to claim 1, it is characterised in that：The return diaphragm For laser absorption body or laser reflector.