CN204012178U - Optical fiber type pulse stretching and compression set based on polarization beam splitting - Google Patents
Optical fiber type pulse stretching and compression set based on polarization beam splitting Download PDFInfo
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- CN204012178U CN204012178U CN201420370926.5U CN201420370926U CN204012178U CN 204012178 U CN204012178 U CN 204012178U CN 201420370926 U CN201420370926 U CN 201420370926U CN 204012178 U CN204012178 U CN 204012178U
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- optical fiber
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Abstract
The utility model discloses a kind of optical fiber type pulse stretching and compression set based on polarization beam splitting, this device comprises polarization beam apparatus, optical fiber collimator and optical fiber, described optical fiber collimator is located at optical fiber two ends, and polarization beam apparatus is connected by light path with optical fiber collimator; When laser pulse bundle process polarization beam apparatus beam-splitting surface, be decomposed into P light and S light time, make two light respectively along different path transmissions, P light or S light continue to transmit in polarization beam apparatus, S light or P light reflect into into Optical Fiber Transmission, difference due to transmission path, two-beam produces time delay to a certain degree, the size of time delay is determined by the length of optical fiber completely, again through polarization beam combiner beam-splitting surface, closing after bundle, just formed two subpulses that have fixed intervals, the amplitude of subpulse is generally half of father's pulse.The utility model is very easy to accurately to control the size of broadening amount, simultaneously simple in structure, is easy to assembling, stability is better.<u/>
Description
Technical field
The utility model belongs to optical device and technical field, relates to pulse stretching and compression set that a kind of paired pulses based on polarization beam splitting divides and merges, is used for short-pulse laser to carry out broadening and compression.
Background technology
Fiber laser is the third generation new laser after traditional gas laser and solid state laser, there is the advantages such as compact conformation, life-span are long, non-maintaining, good beam quality, energy-conserving and environment-protective, the pulse of pulse optical fiber is wherein narrow, peak power is high, without outstanding advantages such as water-cooleds, can be widely used in the fields such as mark, shaping, micromachined and laser medicine, be one of forward position, current optoelectronic information field direction.
Because the peak power of ultrashort laser pulse is very high, directly in optical fiber, carry out pulse amplification easily because nonlinear effect is induced the difficult compression of non-linear video stretching, peak period power also can cause gain media damage, therefore often the advanced line broadening of pulse is reduced to peak power, by gain fibre, amplify again, when output, again pulse compression is exported.Common pulse broadening device has and uses grating, dispersion, the device paired pulses such as non-linear to carry out chirped pulse broadening, all has certain shortcoming, for example, is difficult for accurately control broadening or decrement; Light path accuracy requires high, complicated, and system is unstable; Be difficult in industrial production integrated.
Utility model content
The purpose of this utility model is provide for the deficiencies in the prior art a kind of based on polarization beam apparatus beam splitting/close bundle, utilize optical fiber to realize the pulse division broadening of time delay and the device of compression, this device is very easy to accurately control the size of broadening amount, simultaneously simple in structure, be easy to assembling, stability is better.
The concrete technical scheme that realizes the utility model object is:
Optical fiber type pulse stretching and a compression set based on polarization beam splitting, feature is that this device comprises polarization beam apparatus, optical fiber collimator and optical fiber, and described optical fiber collimator is located at optical fiber two ends, and polarization beam apparatus is connected by light path with optical fiber collimator.
Described optical fiber is single-mode polarization maintaining fiber, multimode polarization maintaining optical fibre, large mould field polarization maintaining optical fibre or photonic crystal polarization maintaining optical fibre.
Described optical fiber collimator is any type of collimation focusing mirror or collimation focusing combined lens group.
Described polarization beam apparatus is: by the dual-polarization beam splitter of two beam-splitting surfaces, the beam splitter that formed by two discrete polarization beam apparatus to or the beam splitter pair of optical veneering.
The logical light face of described polarization beam apparatus is coated with the anti-reflection film of corresponding wave band or is coated with that corresponding wave band band is logical, ASE filtering rete.
The utility model has the following advantages:
1), because optical fiber has flexibility, the feature such as light, with respect to broadening modes such as traditional grating, prisms, the utility model is simple in structure, volume is little, lightweight, stability is better;
2), from cost angle, component structure that the utility model adopts is simple, be easy to make, assembling is simple, very cheap with respect to mode prices such as gratings;
3), the utility model broadening amount is that length by optical fiber determines, and the length of optical fiber is very easy to control and adjust, and therefore can be very easy to accurately control the size of broadening amount;
4), because the utility model time delay dwell portion adopts optical fiber structure, itself has filter action optical fiber, the collimater of input and output simultaneously has the effect of beam shaping, in the time of can making to close bundle, two-beam spatial model is mated preferably; While having avoided two-beam to transmit in space, because the difference of path, light path causes, to close bundle be the unmatched problem of spatial model;
5), the utility model can adopt the mode of multi-stage cascade, realizes more division pulse and broadening amount.
Accompanying drawing explanation
Fig. 1 is the utility model light channel structure schematic diagram;
Fig. 2 is the utility model pulse change schematic diagram;
Fig. 3 is another embodiment light channel structure schematic diagram of the utility model;
Fig. 4 is that schematic diagram is used in the utility model cascade;
Pulse change schematic diagram when Fig. 5 is the utility model cascade use.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
The utility model is decomposed into P light and S light time when laser pulse bundle process polarization beam apparatus beam-splitting surface, make two light respectively along different path transmissions, P light or S light continue to transmit in polarization beam apparatus, S light or P light reflect into into Optical Fiber Transmission, difference due to transmission path, two-beam produces time delay to a certain degree, the size of time delay is determined by the length of optical fiber completely, again through polarization beam combiner beam-splitting surface, closing after bundle, two subpulses that have fixed intervals have just been formed, the amplitude of subpulse is generally half of father's pulse, the method of this division stretched pulse greatly reduces the peak power of pulse, and can multi-stage cascade, every one-level all splits into the subpulse of previous stage two subpulses again, and the cascade of k level can split into 2 by inceptive impulse
kindividual subpulse, becomes 1/2 and the peak power of pulse is also corresponding
k.
Consult Fig. 1, Fig. 2, when pulse laser beam 201 enters after dual-polarization beam splitter 11 by face 111, at first light splitting surface 112 light beams, can be divided into P light and S light two-beam, wherein P light continues to transmit in beam splitter, S light 90 ° of deflections takes the lead in from face 113 outgoing, 12 is optical fiber collimator, its effect is that S light is focused on and is coupled into optical fiber 13, optical fiber 13 is polarization maintaining optical fibre, described S light is being transformed to collimated light beam by optical fiber collimator 14 after optical fiber 13 transmission, by the adjustment of optical fiber collimator 14 being made to still enter polarization beam apparatus 11 with the form of S light through this Shu Guang of optical fiber 13 transmission, at second beam-splitting surface 115 and P light light beam, reconsolidate into light beam from face 116 outgoing, difference due to aforesaid P light and S light transmission path, produced time delay to a certain degree, light beam after merging has had two division pulses 202, as shown in Figure 2, the amplitude of pulse greatly reduces, in time domain, show as the broadening of pulse.
Due to P light and the light path of S light in polarization beam apparatus basically identical, so impulse time delay
be to be determined by the length of polarization maintaining optical fibre 13, relation is as follows:
Wherein n is the refractive index of fiber optic materials, the length that L is optical fiber, and C is the transmission speed of light in vacuum.
For example, the optical fiber that the time delay of 500 psecs need to about 10cm, the time delay of 1 nanosecond needs the optical fiber of 20cm.
Consulting Fig. 3, is another embodiment of the present utility model, and different from Fig. 1 is that the present embodiment postpones P light, pulse laser beam enters after dual-polarization beam splitter 11 via face 117, at first light splitting surface 112 light beams, can be divided into P light and S light two-beam, S light is reflected 90 ° of continuation and transmits in beam splitter, and P light is along former direction transmission and from face 113 outgoing, and focus on and be coupled into optical fiber 13 via optical fiber collimator 12, described P light is being transformed to collimated light beam by optical fiber collimator 14 after optical fiber 13 transmission, by the adjustment of optical fiber collimator 14 being made to still enter polarization beam apparatus 11 with the form of P light through this Shu Guang of Optical Fiber Transmission, at second beam-splitting surface 115 and S light light beam, reconsolidate into light beam again from face 117 outgoing, light beam after merging has two division pulses, and the amplitude of pulse greatly reduces, and shows as the broadening of pulse in time domain.
Fig. 4, Fig. 5 are that schematic diagram is used in the utility model cascade, the P light of polarization beam splitting time delay and S light incide the polarization beam apparatus of rear one-level, its plane of polarization becomes respectively miter angle with P light with S light, P light and S light must again split into new P polarised light and S polarised light in rear one-level beam splitting/beam merging apparatus, experience time delays separately closes bundle, chooses different polarization maintaining optical fibre length L
1, L
2..., after the cascade of k level, obtain 2
kindividual polarization beam splitting pulse, mutual time domain time delay is determined by the length of polarization maintaining optical fibre used; Implement the variation of afterpulse as shown in Figure 5.
The pulse of multistage polarization beam splitting can be changed into by faraday's speculum the polarization direction of quadrature, and the light P polarization reflecting and the exchange of S polarization, along the propagated of phase commute, realize pulse and close bundle.
Claims (5)
1. optical fiber type pulse stretching and the compression set based on polarization beam splitting, is characterized in that this device comprises polarization beam apparatus, optical fiber collimator and optical fiber, and described optical fiber collimator is located at optical fiber two ends, and polarization beam apparatus is connected by light path with optical fiber collimator.
2. device according to claim 1, is characterized in that described optical fiber is single-mode polarization maintaining fiber, multimode polarization maintaining optical fibre, large mould field polarization maintaining optical fibre or photonic crystal polarization maintaining optical fibre.
3. device according to claim 1, is characterized in that described optical fiber collimator is any type of collimation focusing mirror or collimation focusing combined lens group.
4. device according to claim 1, is characterized in that described polarization beam apparatus is: by the dual-polarization beam splitter of two beam-splitting surfaces, the beam splitter that formed by two discrete polarization beam apparatus to or the beam splitter pair of optical veneering.
5. according to the device described in claim 1 or 4, the logical light face that it is characterized in that described polarization beam apparatus is coated with the anti-reflection film of corresponding wave band or is coated with that corresponding wave band band is logical, ASE filtering rete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420370926.5U CN204012178U (en) | 2014-07-07 | 2014-07-07 | Optical fiber type pulse stretching and compression set based on polarization beam splitting |
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| CN201420370926.5U CN204012178U (en) | 2014-07-07 | 2014-07-07 | Optical fiber type pulse stretching and compression set based on polarization beam splitting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759694A (en) * | 2017-11-08 | 2019-05-17 | 住友重机械工业株式会社 | Laser processing device |
| CN110895339A (en) * | 2019-11-01 | 2020-03-20 | 清华大学 | Double-optical-comb multi-pulse distance measuring system and application thereof |
-
2014
- 2014-07-07 CN CN201420370926.5U patent/CN204012178U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759694A (en) * | 2017-11-08 | 2019-05-17 | 住友重机械工业株式会社 | Laser processing device |
| CN110895339A (en) * | 2019-11-01 | 2020-03-20 | 清华大学 | Double-optical-comb multi-pulse distance measuring system and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180910 Address after: 200237 District 2319, room 69, Lane 1985, Chunshen Road, Minhang District, Shanghai 1 district. Co-patentee after: East China Normal University Patentee after: Shanghai Langyan Optoelectronics Technology Co.,Ltd. Address before: 200237 District 2319, room 69, Lane 1985, Chunshen Road, Minhang District, Shanghai 1 district. Patentee before: Shanghai Langyan Optoelectronics Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211015 Address after: Room 4001, building 21, No. 123, Lane 1165, Jindu Road, Minhang District, Shanghai 201100 Patentee after: SHANGHAI LANGYAN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Patentee after: Chongqing Research Institute of East China Normal University Address before: 200237 District 2319, room 69, Lane 1985, Chunshen Road, Minhang District, Shanghai 1 district. Patentee before: SHANGHAI LANGYAN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Patentee before: EAST CHINA NORMAL University |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230523 Address after: No. 1, 2nd Floor, Building 1, No. 2, Huizhu Road, Yubei District, Chongqing 401120 Patentee after: Chongqing Huapu New Energy Co.,Ltd. Address before: Room 4001, building 21, No. 123, Lane 1165, Jindu Road, Minhang District, Shanghai 201100 Patentee before: SHANGHAI LANGYAN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Patentee before: Chongqing Research Institute of East China Normal University |
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| TR01 | Transfer of patent right |