CN207282902U - A kind of Wavelength-tunable external cavity laser - Google Patents
A kind of Wavelength-tunable external cavity laser Download PDFInfo
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- CN207282902U CN207282902U CN201721347370.8U CN201721347370U CN207282902U CN 207282902 U CN207282902 U CN 207282902U CN 201721347370 U CN201721347370 U CN 201721347370U CN 207282902 U CN207282902 U CN 207282902U
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Abstract
The utility model discloses a kind of Wavelength-tunable external cavity laser, it includes laser gain chip, collimation lens, optical path compensation piece, the first tunable filter, the second tunable filter, partially reflecting mirror, optoisolator, convergent lens and the reception optical fiber set gradually along light path, the part reflecting face of the partially reflecting mirror forms laserresonator with the high reflection face at laser gain chip back, and the outside cavity gas laser is by controlling the tuning operation of the first tunable filter and the realization of the second tunable filter to single wavelength laser.The utility model can not only reduce the bandwidth of output wavelength, but also expand wavelength tuning range, while reduce the manufacture difficulty of normal pitch.In addition, the coupling optical path of the whole outside cavity gas laser of the structure is compact, it is possible to achieve the miniaturization of whole laser dimensions.
Description
Technical field
It the utility model is related to optical communication field, more particularly to a kind of Wavelength-tunable external cavity laser.
Background technology
With growing, the DWDM of communication field（Dense wave division multipurpose）Laser with fixed wavelength used in system
Since quantity specifications are numerous, and using flexible is not high so that maintenance and deposit etc. bring very high cost.Therefore, it is adjustable
The development and application of laser solve problem above, and broadband tunable laser can realize any wavelength in C-Band or L-Band
Tuning operation so that system is not only more intelligent, flexibly, but also can realize lower cost.
Extenal cavity tunable laser device has the advantages that wavelength tuning range is wide, output power is high, line width, its basic structure
It is the resonator that laser gain chip and speculum form laser, centre adds filter element and carries out modeling, realizes single longitudinal mode
Laser exports.Some utilizes light using the structure that grating and MEMS combinations are inserted into outside cavity gas laser resonator in the prior art
Grid dispersion and rotation MEMS mirror be filtered, this structurally tuned wavelength is more sensitive to MEMS angles of reflection, structure also compared with
For complexity.Not only away from modeling, this structure is filtered in scheme outside cavity gas laser resonator also using single standard
Ask the fineness of normal pitch high, and tuning range is also restrained.
The content of the invention
In order to solve deficiency of the prior art, the purpose of this utility model is to provide a kind of simple in structure, wavelength tune
Humorous scope is wide, the Wavelength tunable external cavity laser of narrow linewidth.
To achieve the above object, the utility model uses following technical scheme：
A kind of Wavelength-tunable external cavity laser, its laser gain chip for including setting gradually along light path, collimation lens,
Optical path compensation piece, the first tunable filter, the second tunable filter, partially reflecting mirror, optoisolator, convergent lens and reception light
Fibre, the part reflecting face of the partially reflecting mirror forms laserresonator with the high reflection face at laser gain chip back, described
Outside cavity gas laser is by controlling the tuning operation of the first tunable filter and the realization of the second tunable filter to single wavelength laser.
It further includes the photodetector for monitoring laser output power.
The laser gain chip is coated with anti-reflection film, another side of laser gain chip towards one side end face of collimation lens
Face is coated with highly reflecting films and forms high reflection face, and the reflectivity of the highly reflecting films is greater than or equal to 90%, the laser gain chip
The broadband multichannel light beam of generation is emitted from one side end face of anti-reflection film.
The partially reflecting mirror is glass wedge cornual plate, and part reflectance coating forming portion is coated with a side end face of partially reflecting mirror
Divide reflecting surface, anti-reflection film is coated with another side end face of partially reflecting mirror；The photodetector is placed in laser gain chip
Back side with receive from laser gain chip back outgoing luminous power.
The partially reflecting mirror is combination spectroscope, which is bonded to each other shape by the inclined-plane of two pieces of right-angle prisms
Into the spectroscopical side end face of combination is coated with part reflectance coating and forms part reflecting face, which increases with laser
The high reflection face of beneficial chip forms laserresonator；Part reflectance coating is also coated with the inclined-plane that two pieces of right-angle prisms are bonded to each other,
The spectroscopical another side end face of combination is coated with anti-reflection film respectively with spectroscopical lower face is combined；The photodetector is put
In combining spectroscopical lower section to receive the luminous power from the outgoing of combination spectroscope lower face.
First tunable filter and the second tunable filter are normal pitch element, which is heat
Quick material, corresponding regulative mode are thermal tuning modes；Or the normal pitch element material is electrooptical material, corresponding adjusting side
Formula is electric tuning mode.
The FSR of first tunable filter and the second tunable filter is differed；By the first tunable filter during tuning
Align with the transmission peak value wavelength of the second tunable filter with the output wavelength point of demand.
The optical path compensation piece is coated with for silicon materials or the parallel plain film of germanium material, the light pass surface of optical path compensation piece both sides
Anti-reflection film, the refractive index for changing compensating plate by thermal tuning mode carry out optical path compensation.
The isolator is single-stage or Double-stage photo-insulator.
The laser gain chip is coated with the light-emitting window of anti-reflection film and the end face of reception optical fiber be respectively placed in collimation lens and
The focal length ratio of the focal point of convergent lens, collimation lens and convergent lens and laser gain chip and reception optical fiber beam emissions
Angle ratio is inversely proportional.
The utility model uses above structure, due to carrying out wavelength tuning using two normal pitch elements, can not only drop
The bandwidth of low output wavelength, and wavelength tuning range is expanded, while reduce the manufacture difficulty of normal pitch.In addition, the knot
The coupling optical path of the whole outside cavity gas laser of structure is compact, it is possible to achieve the miniaturization of whole laser dimensions.
Brief description of the drawings
The utility model is described in further details below in conjunction with the drawings and specific embodiments；
Fig. 1 is a kind of one schematic diagram of Wavelength-tunable external cavity laser embodiment of the utility model；
Fig. 2 is a kind of two schematic diagram of Wavelength-tunable external cavity laser embodiment of the utility model；
Fig. 3 is a kind of combination spectroscope schematic diagram of Wavelength-tunable external cavity laser embodiment two of the utility model；
Fig. 4 is a kind of Wavelength-tunable external cavity laser filtering characteristic schematic diagram of the utility model.
Embodiment
Fig. 1 is a kind of one schematic diagram of Wavelength-tunable external cavity laser embodiment of the utility model, including along light path successively
The laser gain chip 101 of setting, collimation lens 102, optical path compensation piece 103, the first tunable filter 104, the second adjustable filter
Ripple device 105, partially reflecting mirror 106, optoisolator 107, convergent lens 108 and reception optical fiber 109, the portion of partially reflecting mirror 106
Divide reflecting surface（S3 faces）With the high reflection face at 101 back of laser gain chip（S1 faces）Form laserresonator, the utility model
Outside cavity gas laser by controlling the first tunable filter 104 and the second tunable filter 105 to realize to single wavelength laser
Tuning operation.
In Fig. 1, laser gain chip 101 is towards 102 1 side end face of collimation lens（S2 faces）It is coated with anti-reflection film, laser gain
Another side end face of chip 101（S1 faces）It is coated with highly reflecting films and forms high reflection face, the reflectivity of highly reflecting films is greater than or equal to
90%.Laser gain chip 101 is coated with the end face of anti-reflection film（S2 faces）Light exit be placed in the rear focal point of collimation lens 102, swash
The broadband multichannel divergent beams that gain of light chip 101 produces are from anti-reflection film end face（S2 faces）Outgoing, and pass through collimation lens 102
Divergent beams are collimated, then collimated light beam passes sequentially through optical path compensation piece 103, the first tunable filter 104 and second is adjustable
Part reflecting face of the normal incidence to partially reflecting mirror 106 after wave filter 105（S3 faces）On, the S3 faces of such partially reflecting mirror 106
With the high reflection face of laser gain chip 101（S1）Laserresonator is formd, the light beam reflected on partially reflecting mirror 106 can
In the high reflection face of partially reflecting mirror 106 and laser gain chip 101（S1 faces）The laser resonance intracavitary roundtrip of formation into
Row modeling gain.
In the embodiment in figure 1, partially reflecting mirror 106 is glass wedge cornual plate, is plated on a side end face of partially reflecting mirror 106
There is part reflectance coating to form part reflecting face, anti-reflection film is coated with another side end face of partially reflecting mirror 106.First adjustable filtering
104 and second tunable filter 105 of device is normal pitch element, which is thermo-sensitive material, such as silicon materials, is led to
The mode for crossing heating changes refractive index and is tuned；Or normal pitch element material is electrooptical material, such as piezoelectric ceramics, passes through control
The mode of voltage changes normal pitch thickness and is tuned.In addition, the first tunable filter 104 and the second tunable filter 105
Normal pitch element material can be identical, also can be different, is tuned according to the normal pitch material of selection using corresponding control mode.
In the embodiment in figure 1, optical path compensation piece 103 is the parallel plain film of silicon materials or germanium material, optical path compensation piece 103
The light pass surface of both sides is coated with anti-reflection film, changes the refractive index of compensating plate by thermal tuning mode to compensate or adjust laser resonance
The light path of intracavitary.
Collimater light beam enters optoisolator 107 after passing through partially reflective mirror 106, and optoisolator 107 is that single-stage is optically isolated
Device, if demand segregation tolerance is higher, also optional Double-stage photo-insulator.The function of optoisolator 107 is the positive light of transmission, is isolated
Backlight, avoids backlight from entering laserresonator and produces interference.Collimated light enters convergent lens after optoisolator 107
108, such collimated light is exported after overconvergence into reception optical fiber 109.In order to reach optimal coupling effect, laser
Chip gain 101 is coated with the light-emitting window of anti-reflection film and the end face of reception optical fiber 109 is respectively placed in collimation lens 102 and convergent lens
The focal length ratio of 108 focal point, collimation lens 102 and convergent lens 108 and laser gain chip 101 and reception optical fiber 109
Beam emissions angle ratio is inversely proportional.
For the output power of monitoring laser, photodetector 110 is placed behind laser gain chip 101, is used for
Receive the luminous power being emitted from the S1 faces of laser gain chip 101.
Fig. 2 is a kind of two schematic diagram of Wavelength-tunable external cavity laser embodiment of the utility model, including along light path successively
The laser gain chip 201 of setting, collimation lens 202, optical path compensation piece 203, the first tunable filter 204, the second adjustable filter
Ripple device 205, partially reflecting mirror 206, optoisolator 207, convergent lens 208 and reception optical fiber 209, the portion of partially reflecting mirror 206
Divide reflecting surface（S3 faces）With the high reflection face at 201 back of laser gain chip（S1 faces）Form laserresonator, the utility model
Outside cavity gas laser by controlling the first tunable filter 204 and the second tunable filter 205 to realize to single wavelength laser
Tuning operation.
In Fig. 2, laser gain chip 201 is towards 202 1 side end face of collimation lens（S2 faces）It is coated with anti-reflection film, laser gain
Another side end face of chip 201（S1 faces）It is coated with highly reflecting films and forms high reflection face, the reflectivity of highly reflecting films is greater than or equal to
90%.Laser gain chip 201 is coated with the end face of anti-reflection film（S2 faces）Light exit be placed in the rear focal point of collimation lens 202, swash
The broadband multichannel divergent beams that gain of light chip 201 produces are from anti-reflection film end face（S2 faces）Outgoing, and pass through collimation lens 202
Divergent beams are collimated, then collimated light beam passes sequentially through optical path compensation piece 203, the first tunable filter 204 and second is adjustable
Part reflecting face of the normal incidence to partially reflecting mirror 206 after wave filter 205（S3 faces）On, the S3 faces of such partially reflecting mirror 206
With the high reflection face of laser gain chip 201（S1 faces）Laserresonator is formd, the light beam reflected on partially reflecting mirror 206
Can be in the high reflection face of partially reflecting mirror 206 and laser gain chip 201（S1 faces）The laser resonance intracavitary roundtrip of formation
Carry out modeling gain.
In the embodiment of fig. 2, partially reflecting mirror 206 is combination spectroscope, and the combination spectroscope is by two pieces of right-angle prisms
Inclined-plane be bonded to each other to be formed, combine a spectroscopical side end face（S3 faces）It is coated with part reflectance coating and forms part reflecting face, should
The high reflection face of part reflecting face and laser gain chip 201（S1 faces）Form laserresonator.First tunable filter, 204 He
Second tunable filter 205 is normal pitch element, which is thermo-sensitive material, such as silicon materials, passes through heating
Mode change refractive index and be tuned；Or normal pitch element material is electrooptical material, such as piezoelectric ceramics, by controlling voltage
Mode changes normal pitch thickness and is tuned.In addition, the normal pitch of the first tunable filter 204 and the second tunable filter 205
Element material can be identical, also can be different, is tuned according to the normal pitch material of selection using corresponding control mode.
In the embodiment of fig. 2, optical path compensation piece 203 is the parallel plain film of silicon materials or germanium material, optical path compensation piece 203
The light pass surface of both sides is coated with anti-reflection film, changes the refractive index of compensating plate by thermal tuning mode to compensate or adjust laser resonance
The light path of intracavitary.
Collimater light beam enters optoisolator 207 after passing through partially reflective mirror 206, and optoisolator 207 is that single-stage is optically isolated
Device 207, if demand segregation degree is higher, also optional Double-stage photo-insulator 207.The function of optoisolator 207 is the positive light of transmission,
Isolate backlight, avoid backlight from entering laserresonator and produce interference.Collimated light enters after optoisolator 207 to be assembled thoroughly
Mirror 208, such collimated light are exported after overconvergence into reception optical fiber 209.In order to reach optimal coupling effect, swash
Gain of light chip 201 is coated with the light-emitting window of anti-reflection film and the end face of reception optical fiber 209 is respectively placed in collimation lens 202 and assembles saturating
The focal length ratio of the focal point of mirror 208, collimation lens 202 and convergent lens 208 and laser gain chip 201 and reception optical fiber
209 beam emissions angle ratios are inversely proportional.
In the embodiment of fig. 2, partially reflecting mirror 206 is combination spectroscope, and Fig. 3 is combination spectroscope schematic diagram, is combined
A spectroscopical side end face（S3 faces）It is coated with part reflectance coating and forms part reflecting face, the part reflecting face and laser gain chip
201 high reflection face（S1 faces）Form laserresonator, the inclined-plane that two pieces of right-angle prisms are bonded to each other（S4 faces）On be also coated with portion
Divide reflectance coating, combine spectroscopical another side end face（S5 faces）With the spectroscopical lower face of combination（S6 faces）It is coated with respectively anti-reflection
Film.
For the output power of monitoring laser, photodetector 210 is placed combining spectroscopical lower section, is received through S4
The luminous power that face is reflected and is emitted from S6 faces.
Fig. 4 is a kind of Wavelength-tunable external cavity laser filtering characteristic schematic diagram of the utility model, Fig. 4（a）In dotted line
Represent each longitudinal mode of exocoel device, each longitudinal mode corresponds to a wavelength.Fig. 4（b）The transmission filtering of corresponding first tunable filter
Curve a, from fig. 4, it can be seen that transmission of the longitudinal mode of wavelength 1554.94nm and the first tunable filter transmission filter curve
Peak position（1554.94nm）Overlap.The light beam for inciding each longitudinal mode of the first adjustable filter is filtered by the first adjustable type
There was only the light beam ability of the longitudinal mode that is overlapped with the transmission peak position of the transmission filter curve of the first adjustable filter of wavelength after ripple device
Can be loss-free by and the light of wavelength and the misaligned longitudinal mode of the transmission filter curve peak position of the first adjustable filter
By being subject to different degrees of decay during the first adjustable filter.Fig. 4（c）Song is filtered for the transmission of the second tunable filter
Line, the FSR of the second tunable filter and the FSR of the first tunable filter are slightly different, but filtering principle is the same.
Such as Fig. 4（c）It is shown, during tuning by a transmission peak position of the second tunable filter transmission filter curve be transferred to
Wavelength 1554.94nm is overlapped, and is so passing through the first tunable filter in succession from the light of more longitudinal modes of laser gain chip outgoing
With the light for there was only a longitudinal mode after the second tunable filter substantially, the light of other longitudinal modes is due to being subject to greater attenuation not deposit substantially
Such as Fig. 4（c）.Therefore, from the partially reflecting mirror of laserresonator be emitted be single longitudinal mode laser, the single longitudinal mode
（Wavelength）Laser after optoisolator, convergent lens by reception optical fiber couple export.Due to the first tunable filter and second
Tunable filter is adjustable normal pitch element, so the outside cavity gas laser of the utility model can realize any single ripple of output
Long laser.
It should be noted that：The deformation and change of embodiments disclosed herein are possible, for those this areas
The replacement of embodiment and equivalent various parts are known for those of ordinary skill.It should be clear to a person skilled in the art that
Be, in the case where not departing from the spirit or essential characteristics of the utility model, the utility model can in other forms, structure,
Arrangement, ratio are realized.
Claims (10)
- A kind of 1. Wavelength-tunable external cavity laser, it is characterised in that：Its laser gain chip for including setting gradually along light path, Collimation lens, optical path compensation piece, the first tunable filter, the second tunable filter, partially reflecting mirror, optoisolator, convergence are saturating Mirror and reception optical fiber, the part reflecting face of the partially reflecting mirror and the high reflection face formation laser at laser gain chip back are humorous Shake chamber, and the outside cavity gas laser is by controlling the first tunable filter and the second tunable filter to realize to single wavelength laser Tuning operation.
- A kind of 2. Wavelength-tunable external cavity laser according to claim 1, it is characterised in that：It is further included for monitoring The photodetector of laser output power.
- A kind of 3. Wavelength-tunable external cavity laser according to claim 1, it is characterised in that：The laser gain chip Anti-reflection film is coated with towards one side end face of collimation lens, another side end face of laser gain chip is coated with highly reflecting films and forms high reflection Face, the reflectivity of the highly reflecting films are greater than or equal to 90%, and the broadband multichannel light beam that the laser gain chip produces is from increasing One side end face of permeable membrane is emitted.
- A kind of 4. Wavelength-tunable external cavity laser according to claim 2, it is characterised in that：The partially reflecting mirror is Glass wedge cornual plate, part reflectance coating is coated with a side end face of partially reflecting mirror and forms part reflecting face, partially reflecting mirror it is another Anti-reflection film is coated with one side end face；The photodetector is placed in the back side of laser gain chip to receive from laser gain The luminous power of chip back outgoing.
- A kind of 5. Wavelength-tunable external cavity laser according to claim 2, it is characterised in that：The partially reflecting mirror is Spectroscope is combined, which is bonded to each other by the inclined-plane of two pieces of right-angle prisms forms, the spectroscopical side of combination End face is coated with the high reflection face formation laser that part reflectance coating forms part reflecting face, the part reflecting face and laser gain chip Resonator；Also part reflectance coating, the spectroscopical another side of combination are coated with the inclined-plane that two pieces of right-angle prisms are bonded to each other Face and the spectroscopical lower face of combination are coated with anti-reflection film respectively；The photodetector is placed in the spectroscopical lower section of combination to receive From the luminous power of combination spectroscope lower face outgoing.
- A kind of 6. Wavelength-tunable external cavity laser according to claim 1, it is characterised in that：The first adjustable filtering Device and the second tunable filter are normal pitch element, which is thermo-sensitive material, and corresponding regulative mode is Thermal tuning mode；Or the normal pitch element material is electrooptical material, corresponding regulative mode is electric tuning mode.
- A kind of 7. Wavelength-tunable external cavity laser according to claim 6, it is characterised in that：The first adjustable filtering The FSR of device and the second tunable filter is differed；By the transmission peaks of the first tunable filter and the second tunable filter during tuning Value wavelength aligns with the output wavelength point of demand.
- A kind of 8. Wavelength-tunable external cavity laser according to claim 1, it is characterised in that：The optical path compensation piece is The parallel plain film of silicon materials or germanium material, the light pass surface of optical path compensation piece both sides are coated with anti-reflection film, are changed by thermal tuning mode The refractive index for becoming compensating plate carries out optical path compensation.
- A kind of 9. Wavelength-tunable external cavity laser according to claim 1, it is characterised in that：The isolator is single-stage Or Double-stage photo-insulator.
- A kind of 10. Wavelength-tunable external cavity laser according to claim 1, it is characterised in that：The laser gain core Piece is coated with the light-emitting window of anti-reflection film and the end face of reception optical fiber is respectively placed in the focal point of collimation lens and convergent lens, and collimation is saturating The focal length ratio of mirror and convergent lens is inversely proportional with laser gain chip and reception optical fiber beam emissions angle ratio.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721347370.8U CN207282902U (en) | 2017-10-19 | 2017-10-19 | A kind of Wavelength-tunable external cavity laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721347370.8U CN207282902U (en) | 2017-10-19 | 2017-10-19 | A kind of Wavelength-tunable external cavity laser |
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| CN207282902U true CN207282902U (en) | 2018-04-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108555438A (en) * | 2018-07-06 | 2018-09-21 | 温州大学激光与光电智能制造研究院 | Laser machine fundamental frequency frequency multiplication switching system and its method |
| CN109687275A (en) * | 2017-10-19 | 2019-04-26 | 福州高意通讯有限公司 | A kind of Wavelength-tunable external cavity laser |
-
2017
- 2017-10-19 CN CN201721347370.8U patent/CN207282902U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687275A (en) * | 2017-10-19 | 2019-04-26 | 福州高意通讯有限公司 | A kind of Wavelength-tunable external cavity laser |
| CN108555438A (en) * | 2018-07-06 | 2018-09-21 | 温州大学激光与光电智能制造研究院 | Laser machine fundamental frequency frequency multiplication switching system and its method |
| CN108555438B (en) * | 2018-07-06 | 2024-05-10 | 温州大学激光与光电智能制造研究院 | Fundamental frequency and frequency doubling switching system and method for laser processing |
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