CN108899755B - Tunable optical microcavity doped laser - Google Patents
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Abstract
The divisional application relates to the field of lasers, in particular to a tunable optical microcavity doped laser. The tunable optical microcavity doped laser comprises a second pumping source for generating 980nm or 1480nm pumping light, a doped optical microcavity, a coupling device, a wavelength division multiplexer and a temperature control device, wherein the second pumping source, the doped optical microcavity and the wavelength division multiplexer are connected through the coupling device, and the doped optical microcavity is located in the temperature control range of the temperature control device. The tunable optical microcavity doped laser has the advantages of simple structure, small volume, high Q value, convenience for subsequent integrated application, realization of tuning of emergent laser wavelength by controlling the temperature of the optical microcavity, simple and convenient tuning mechanism and high efficiency.
Description
The application is divisional application with application number 201510391617.5, application date 2015, 7 months and 3 days, and invention title "tunable optical microcavity raman laser and tunable optical microcavity doped laser".
Technical Field
The invention relates to the field of lasers, in particular to a tunable optical microcavity doped laser.
Background
Tunable fiber lasers are key components of modern fiber communication systems, have natural compatibility with optical fibers and high-quality beam quality, and are also commonly used in the fields of medicine, fiber sensing and spectral analysis. With the increase of communication capacity and the development of optical fiber manufacturing technology, tunable optical fiber lasers are receiving more and more attention and are gradually applied. In practice, however, it has been found that there are some problems that are difficult to overcome in all types of tunable fiber lasers currently on the market.
The structure of the existing tunable Raman fiber laser mainly comprises a pumping source, a resonant cavity, a gain medium and an acousto-optic tunable filter, wherein the resonant cavity is generally formed by adopting a grating pair or cascade mode, a longer high nonlinear fiber is used as the gain medium, the output wavelength depends on the wavelength of the pumping source and the Raman frequency shift of the gain medium, and the tuning of the output wavelength is carried out by the acousto-optic tunable filter. The problems with the tunable raman fiber laser of this structure are: (1) the volume is relatively large by adopting a long optical fiber as a nonlinear gain medium; (2) the resonant cavity adopts a form of cascading a plurality of pairs of Fiber Bragg Gratings (FBGs), and the conventional FBG has a narrow reflection bandwidth, so that the conversion efficiency of the laser is limited; (3) the chip can not be well integrated with a chip of a communication system, and large-scale integrated development and application can not be realized; (4) the Q value is low, the conversion efficiency of the laser is low, the threshold value is high, and the relative intensity noise is high; (5) the tuning mechanism of the laser generally adopts the forms of filter tuning, thermal tuning and the like, and extra optical devices are required to be introduced for the filter tuning, so that the complexity and the insertion loss of the system are increased, and the cost of the laser is increased; for thermal tuning, large-area heating is required, and the heating efficiency is low.
The structure of the existing tunable doped fiber laser mainly comprises a pumping source, a gain medium (namely rare earth ion doped fiber), a resonant cavity and a wavelength selection device, wherein the energy of the pumping source stimulates rare earth doped ions in the fiber to jump to a high energy level, the ions jump to a metastable laser upper energy level through radiationless transition to form population inversion, then jump to a laser lower energy level to generate photons, the photons form laser output after oscillation and amplification in the resonant cavity, and the tuning of the output wavelength is carried out through the wavelength selection device. The problems of the tunable doped fiber laser with the structure are as follows: (1) the longer optical fiber is used as a gain medium, the volume is relatively larger, the application of the optical fiber in occasions with special requirements on the size is limited, and the application is inconvenient; (2) the chip can not be well integrated with the chip of the modern communication system, and large-scale integrated development and application are difficult; (3) the Q value is low, the conversion efficiency of the laser is low, and the threshold value is high; (4) the tuning mechanism of the laser mostly adopts the forms of fiber grating tuning, thermal tuning, fiber ring mirror tuning, filter tuning and the like, wherein the fiber grating tuning is limited by the temperature and strain response sensitivity of the bare fiber grating, and the tuning range is narrow; for thermal tuning, large-area heating is needed, and the heating efficiency is low; extra optical devices are required to be introduced for tuning the optical fiber ring mirror and tuning the filter, so that the complexity and the insertion loss of the system are increased, and the cost of the laser is increased; the tuning mechanisms of the above modes have defects, and are not suitable for the requirements of miniaturization and integration of optical devices of modern optical fiber communication systems.
Therefore, there is a need to provide an improved solution to the problems of the conventional tunable fiber laser.
With the continuous and deep research on optical micro-cavities, lasers based on optical micro-cavities are becoming the new trend of lasers.
Optical microcavity refers to a resonant optical cavity with a high quality factor (Q) and dimensions comparable to optical wavelengths. The shapes of the existing optical micro-cavities mainly comprise micro-rings, microspheres, micro-discs, micro-columns, micro-core circular rings, deformation cavities and the like. Among them, the optical microcavity based on the whispering gallery mode is most representative.
Whispering Gallery modes, known as Whispering Gallery Modes (WGM), are Whispering Gallery Whispering bells, which are well known as typical applications, are used. Similar to the reflection of sound waves on a wall surface, when light is incident from a light density to a light sparse medium and the incident angle is large enough, total reflection can also occur on the surfaces of the two media, and then an optical whispering gallery mode also exists at the interface of the curved high refractive index medium. Within the boundaries of the closed cavity, light can then be trapped all the time inside the cavity to maintain a stable traveling wave transmission mode.
The optical microcavity-based laser has the advantages that the conventional resonant cavity is replaced by the optical microcavity in the structure of the laser, and the optical microcavity-based laser has excellent characteristics compared with the conventional optical fiber laser due to the high Q value of the optical microcavity. With the continuous development of optical microcavity technology, its application in the laser field is also more and more extensive, such as optical microcavity-based raman laser and optical microcavity-based doped laser, but the research on tunable optical microcavity laser is almost in the blank stage, and no relevant technical data is found yet.
Disclosure of Invention
Aiming at the problems of the tunable fiber laser in the prior art, the invention provides a novel tunable Raman laser and a tunable doped laser based on an echo wall type optical microcavity prepared on a semiconductor chip.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
the tunable optical microcavity Raman laser comprises a first pumping source, an optical microcavity, a coupling device and a temperature control device, wherein the first pumping source is connected with the optical microcavity through the coupling device, and the optical microcavity is located in the temperature control range of the temperature control device.
The technical scheme has the advantages that:
1. the long optical fiber is not needed to be used as a nonlinear gain medium, and the pump light generates stimulated Raman scattering in the optical microcavity to generate Raman frequency shift, so that the laser has a simple structure and a small volume, and is convenient to apply in various occasions.
2. The temperature control device is used for controlling the temperature of the optical microcavity, so that the tuning of the output laser wavelength of the optical microcavity is realized, and the tuning mechanism is simple, convenient and high in efficiency.
3. The optical microcavity replaces the traditional resonant cavity, and has the advantages of high Q value, high conversion efficiency, low threshold value and low relative intensity noise.
4. The optical microcavity is prepared on the semiconductor chip, so that the optical microcavity can be conveniently integrated with other system chips connected subsequently, and large-scale development and application are facilitated.
As an improvement, the device further comprises a polarization controller, wherein the polarization controller is connected between the first pump source and the coupling device; the method is used for tuning the polarization characteristic of the pump light and improving the coupling efficiency.
Preferably, the optical microcavity is made of any one of silicon dioxide, polymer, semiconductor and calcium fluoride; according to the respective advantages of different manufactured materials, the proper occasion and application are selected.
Preferably, the optical microcavity has any one of a micro-ring, a microsphere, a micro-disc, a micro-column, a micro-core ring and a deformation cavity; the optical microcavity has multiple selectable structures, and suitable application is selected according to the characteristics of different structures.
As an improvement, the inner surface of the optical microcavity is provided with a coating, and the coating is a metal material coating or other material coatings; the plating layer is added, the physical characteristics of the optical microcavity are improved, the heat conduction efficiency of the optical microcavity is increased, and the control precision of the temperature control device is improved.
Preferably, the coupling device is any one of an optical fiber cone, an optical fiber with one end being polished obliquely, a waveguide and a prism; various coupling devices can be selected, and suitable occasions and applications can be selected according to respective characteristics of different coupling devices.
In order to achieve the technical purpose, the other technical scheme of the invention is as follows:
the tunable optical microcavity doped laser comprises a second pumping source for generating 980nm or 1480nm pumping light, a doped optical microcavity doped with an active gain substance, a coupling device and a wavelength division multiplexer, wherein the second pumping source, the doped optical microcavity and the wavelength division multiplexer are connected through the coupling device, and the tunable optical microcavity doped laser further comprises a temperature control device, and the doped optical microcavity is located in the temperature control range of the temperature control device.
The technical scheme has the advantages that:
1. the doping material of the optical microcavity is a gain medium, and a longer optical fiber is not needed to be used as the gain medium, so that the laser has a simple structure and a small volume, and is convenient to apply to various occasions.
2. The temperature control device is used for controlling the temperature of the optical microcavity, so that the tuning of the output laser wavelength of the optical microcavity is realized, and the tuning mechanism is simple, convenient and high in efficiency.
3. The optical microcavity is prepared on the semiconductor chip, so that the optical microcavity can be conveniently integrated with other system chips connected subsequently, and large-scale development and application are facilitated.
4. The optical microcavity replaces the traditional resonant cavity, and has the advantages of high Q value, high conversion efficiency, low threshold value and low relative intensity noise.
As an improvement, the device further comprises a polarization controller, wherein the polarization controller is connected between the second pump source and the coupling device; the method is used for tuning the polarization characteristic of the pump light and improving the coupling efficiency.
Preferably, the active gain material comprises at least one rare earth ion; the optical microcavity can be doped with one kind of rare earth ions or doped with multiple kinds of rare earth ions.
Preferably, the doped optical microcavity is made of any one of silicon dioxide, polymer, semiconductor and calcium fluoride; according to the respective advantages of different manufactured materials, the proper occasion and application are selected.
Preferably, the structure of the doped optical microcavity is any one of a micro-ring, a microsphere, a micro-disc, a micro-column, a micro-core ring and a deformation cavity; the optical microcavity has multiple selectable structures, and suitable application is selected according to the characteristics of different structures.
As an improvement, the inner surface of the doped optical microcavity is provided with a coating, and the coating is a metal material coating or other material coatings; the plating layer is added, the physical characteristics of the optical microcavity are improved, the heat conduction efficiency of the optical microcavity is increased, and the control precision of the temperature control device is improved.
Preferably, the coupling device is any one of an optical fiber cone, an optical fiber with one end being polished obliquely, a waveguide and a prism; various coupling devices can be selected, and suitable occasions and applications can be selected according to respective characteristics of different coupling devices.
Drawings
FIG. 1 is a schematic structural diagram of a tunable optical microcavity Raman laser according to an embodiment of the present invention;
FIG. 2 is a schematic view of the connection of the optical fiber taper to the optical microcavity;
FIG. 3 is a graph showing the relationship between the wavelength of the outgoing laser light and the temperature of the optical microcavity of the tunable optical microcavity Raman laser of the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a tunable optical microcavity doped laser of the present invention;
FIG. 5 is a graph of the variation of the lasing wavelength versus the optical microcavity temperature for an embodiment of the tunable optical microcavity doped laser of the present invention;
reference numerals: 1. the device comprises a first pumping source, 2, an optical microcavity, 3, a coupling device, 4, a temperature control device, 5, a polarization controller, 6, a second pumping source, 7, a doped optical microcavity, 8, a wavelength division multiplexer, 8.1, a first port of the wavelength division multiplexer, 8.2, a second port of the wavelength division multiplexer, 8.3 and a third port of the wavelength division multiplexer.
Detailed Description
Micro-ring optical microcavity tuning principle
The resonant wavelength of the micro-ring type optical microcavity can be written in the form of formula 1
λMIs the wavelength of laser in vacuum in M (M is positive integer) order resonance mode, R is the radius of the microdisk, neffIs the effective index of refraction of the whispering gallery modes. The resonant emission wavelength in the gain spectrum can be changed by changing the resonant wavelength condition of the formula 1, so that the tuning of the output wavelength of the laser is realized. When the temperature of the microcavity changes, the refractive index of both the microcavity volume and the microcavity material changes. The equation for the microcavity resonance wavelength with respect to temperature change can thus be found as follows:
referring to fig. 1, a specific embodiment of the tunable optical microcavity raman laser of the present invention is described in detail, but the present invention is not limited to the claims.
As shown in fig. 1, the tunable optical microcavity raman laser includes a first pump source 1, an optical microcavity 2, a coupling device 3, a temperature control device 4, and a polarization controller 5, where the first pump source 1 and the optical microcavity 2 are connected through the coupling device 3, the polarization controller 5 is connected between the first pump source 1 and the coupling device 3, and the optical microcavity 2 is located within a temperature control range of the temperature control device 4.
The first pump source 1 is semiconductor laser generating 1550nm pump light, the optical micro cavity 2 is made of silicon dioxide and has micro ring structure with resonant wavelength temperature coefficient of 6 × 10-6[1/℃]According to the formula (2) and the related material temperature coefficient, the output wavelength of the Raman laser shifts 6 × 10 for every 1 ℃ change of the temperature of the micro-ring cavity-6λ0(λ0The resonant wavelength of the microcavity at the initial temperature); the coupling device 3 adopts an optical fiber cone, the coupling efficiency is high, and the connection mode of the optical fiber cone and the optical microcavity is shown in figure 2; the polarization controller 5 is used for controlling the polarization state of the pump light and improving the coupling efficiency of the laser; the temperature control device 4 heats the optical microcavity 2, and tuning of the laser wavelength emitted by the laser is realized by accurately controlling the temperature of the optical microcavity 2.
When the optical fiber micro-cavity laser works, 1550nm pump light emitted by a first pump source 1 is emitted into a polarization controller 5, the polarization controller 5 adjusts the polarization state of the pump light and then outputs the pump light to an optical fiber cone, the pump light is coupled into an optical micro-cavity 2 through the optical fiber cone, the energy of the pump light coupled into the optical micro-cavity is concentrated in the optical micro-cavity to form a high-intensity laser field, Stokes light and anti-Stokes light are generated in the cavity due to a stimulated Raman scattering effect, the pump light is coupled with the Stokes light and the anti-Stokes light to cause energy transfer, so that Raman frequency shift of the laser is realized, emergent laser is formed, and then the emergent laser is coupled and output from the optical micro-cavity 2 through the optical.
The emergent laser is connected into a spectrometer, the emergent laser wavelength is measured, experimental data are recorded, and a change relation graph between the emergent laser wavelength and the optical microcavity temperature of the tunable optical microcavity Raman laser shown in figure 3 is obtained.
It can be known from fig. 3 that when the temperature of the optical microcavity rises from 23 ℃ to 89.5 ℃, the wavelength of the outgoing laser of the tunable optical microcavity raman laser also shifts from 1642.85nm to 1643.59nm, wherein the initial resonant wavelength of the optical microcavity is 1642.85nm, the black solid line in fig. 3 is a linear fit to the experimental data, the linearity is 0.99688, and it can be known that the slope of the linear fit is 0.01117, i.e., the coefficient of change of the wavelength of the outgoing laser of the laser with temperature is 0.01117 nm/deg.c, which is basically consistent with the theoretical value.
When the above technical solution is implemented, attention needs to be paid to:
1. the first pump source 1 may be a semiconductor laser, or may be a solid laser, a dye laser, or other types of lasers;
2. the wavelength of the pump light is not limited to 1550nm, and various wavelengths can be used, but a certain power is required to be met so as to achieve the condition of generating stimulated raman scattering, because in practical application, the lasers are not distinguished by power, but by wavelength, and the power of the lasers is adjustable, such as 980nm lasers and 1550nm lasers, the power of the pump source in the technical scheme is not limited;
3. the optical microcavity 2 is made of silicon dioxide, and may be chip silicon-based materials such as silicon, silicon dioxide, silicon nitride, and other semiconductor materials, or may be a fused amorphous glass material, a crystalline material (mainly including calcium fluoride and magnesium fluoride), a polymer material, and the like; the structure of the optical microcavity 2 is not limited to a micro-ring, but can be microspheres, micro-discs, micro-columns, micro-core rings, deformation cavities and other types; the inner surface of the optical microcavity 2 can be further provided with a coating, so that the physical characteristics of the optical microcavity are improved, the heat conduction efficiency of the optical microcavity is increased, and the control precision of the temperature control device is improved;
4. the coupling device 3 is not limited to be in the form of an optical fiber cone, and can also be an optical fiber with one end polished obliquely, a waveguide, a prism and other near-field coupling devices;
5. the temperature control device 4 may be an electric heating plate, a thermocouple, etc., and the heating position thereof may be the bottom of the optical microcavity 2, or may be other positions such as the side face of the optical microcavity 2, and the specific heating manner may be direct heating, for example, the electric heating plate directly contacts the microcavity, or indirect heating, for example, the ambient temperature around the optical microcavity 2 is changed.
Referring to fig. 4, a specific embodiment of the tunable optical microcavity doped laser of the present invention is described in detail, but the present invention is not limited thereto.
As shown in fig. 4, the tunable optical microcavity doped laser includes a second pump source 6 generating pump light of 980nm or 1480nm, a doped optical microcavity 7 doped with an active gain material, a coupling device 3, a wavelength division multiplexer 8, a temperature control device 4, and a polarization controller 5, where the second pump source 6, the doped optical microcavity 7, and the wavelength division multiplexer 8 are connected through the coupling device 3, the polarization controller is connected between the second pump source 6 and the coupling device 3, and the doped optical microcavity 7 is located within a temperature control range of the temperature control device 4.
The second pump source 6 is a semiconductor laser generating 980nm pump light, the doped optical microcavity 7 is made of silicon dioxide and has a micro-ring structure, the doped active gain substance is erbium ion, and the temperature coefficient a of the resonant wavelength is 6 × 10-6[1/℃]According to the formula (2) and the related material temperature coefficient, the output wavelength of the Raman laser shifts 6 × 10 for every 1 ℃ change of the temperature of the micro-ring cavity-6λ0(λ0The resonant wavelength of the microcavity at the initial temperature); the coupling device 3 adopts an optical fiber cone, the coupling efficiency is high, and the connection mode of the optical fiber cone and the optical microcavity is shown in figure 2; the polarization controller 5 is used for controlling the polarization state of the pump light and improving the coupling efficiency of the laser; the temperature control device 4 heats the doped optical microcavity 7, and the tuning of the laser wavelength emitted by the laser is realized by accurately controlling the temperature of the doped optical microcavity 7; a wavelength division multiplexer 8 for adding the doped optical microcavity 7 to the output laserUnwanted stray light (unabsorbed pump light, fluorescence generated by the gain medium, etc.) and actually required laser light are filtered and output respectively.
When the optical fiber coupling device works, 980nm pump light emitted by the second pump source 6 enters the polarization controller 5, the polarization controller 5 adjusts the polarization state of the pump light and then outputs the pump light to the optical fiber cone, the pump light enters the doped optical microcavity 7 through the optical fiber cone in a coupling mode, erbium ions doped in the optical microcavity 7 absorb the pump light entering the optical fiber cone in a coupling mode, the pump light is excited to jump to a high energy level, the ions jump to a metastable laser upper energy level through radiationless transition to form particle number inversion, the ions jump to a laser lower energy level to generate photons, the photons oscillate and amplify in the microcavity to form emergent laser, the emergent laser is coupled and output to the wavelength division multiplexer 8 from the doped optical microcavity 7 through the optical fiber cone, the emergent laser is received by a first port 8.1 (suitable for 980nm/1550nm wave band) of the wavelength division multiplexer 8, the wavelength division multiplexer 8 filters the undesired stray light (mainly unabsorbed pump light) and the desired laser respectively pass through a second port 8.2 (suitable for 980nm wave band) and a third port 8. And 1550nm band).
The required laser output from the third port 8.3 of the wavelength division multiplexer 8 is connected to a spectrometer, the wavelength of the output laser is measured, experimental data is recorded, and a graph of the change relationship between the outgoing laser wavelength of the tunable optical microcavity doped laser and the temperature of the doped optical microcavity 7 as shown in fig. 5 is obtained.
It can be known from fig. 5 that when the temperature of the doped optical microcavity rises from 23 ℃ to 89.5 ℃, the wavelength of the laser output of the tunable optical microcavity doped laser also drifts from 1535.75nm to 1536.39nm, wherein the initial resonant wavelength of the doped optical microcavity 7 is 1535.75nm, the black solid line in fig. 5 is a linear fit to the experimental data, the linearity is 0.99496, and the slope of the linear fit is 0.00974, so that the coefficient of change of the wavelength of the tunable optical microcavity doped laser with the temperature is 0.00974 nm/deg.c, which is basically consistent with the theoretical value.
When the above technical solution is implemented, attention needs to be paid to:
1. the second pump source 6 may be a semiconductor laser, or may be a solid laser, a dye laser, or other types of lasers;
2. the wavelength of the pump light is not limited to 980nm but may also be 1480nm, as long as it is suitable for absorption by the active gain substance doped by the doped optical microcavity 7.
3. The material for manufacturing the doped optical microcavity 7 is not limited to silicon dioxide, and can be chip silicon-based materials such as silicon, silicon dioxide, silicon nitride and the like and other semiconductor materials, and can also be fused amorphous glass materials, crystalline materials (mainly including calcium fluoride and magnesium fluoride), polymer materials and the like; the structure of the doped optical microcavity 7 is not limited to a micro-ring, but can be microspheres, micro-discs, micro-columns, micro-core rings, deformation cavities and other types; the active gain material doped by the doped optical microcavity 7 can be one of rare earth ions such as erbium and ytterbium, and can also be co-doped with a plurality of rare earth ions; the inner surface of the doped optical microcavity 7 can be further provided with a coating, so that the physical characteristics of the doped optical microcavity are improved, the heat conduction efficiency of the doped optical microcavity is increased, and the control precision of the temperature control device is improved;
4. the coupling device 3 is not limited to be in the form of an optical fiber cone, and can also be an optical fiber with one end polished obliquely, a waveguide, a prism and other near-field coupling devices;
5. the temperature control device 4 can be an electric heating disc, a thermocouple and the like, and the heating position can be the bottom of the doped optical microcavity 7 or other positions such as the side surface of the doped optical microcavity 7; the specific heating method can be direct heating, such as a hot plate directly contacting the microcavity, or indirect heating, such as changing the ambient temperature around the doped optical microcavity 7.
It can be known from the two embodiments that the tunable microcavity laser provided by the invention adopts a chip-type optical microcavity instead of a traditional resonant cavity, and utilizes the characteristic that the optical microcavity changes with temperature (i.e. when the temperature of the optical microcavity changes, the volume and the refractive index of the optical microcavity also change with the temperature change), and realizes tuning of the outgoing laser wavelength by controlling the temperature of the optical microcavity.
Compared with the existing tunable fiber laser, the tunable microcavity laser has the advantages of simple structure, small volume and low cost; the Q value is high, the conversion efficiency is high, the threshold value is low, and the relative intensity noise is low; the tuning mechanism adopts thermal tuning, and the tuning is simple, convenient and efficient.
Although the tuning principle of the tunable microcavity laser is similar to that of the thermal tuning fiber laser with the traditional structure, the optical microcavity structure is adopted, so that the area needing to be heated is obviously reduced, the heating is simpler, the thermal conversion efficiency is higher, the tuning speed is higher, and the performance of the tunable microcavity laser is obviously superior to that of the thermal tuning fiber laser with the traditional structure.
In summary, the tunable microcavity laser provided by the invention uses the chip-type optical microcavity to replace the traditional resonant cavity, has small volume and high Q value, and is convenient for subsequent integrated application; the tuning mechanism is simple, convenient and efficient. Compared with the existing tunable fiber laser, the fiber laser has more excellent performance and simpler structure, and is more suitable for integrated application.
It is to be understood that the above detailed description of the present invention is only for illustrating the present invention and not limited to the technical solutions described in the embodiments of the present invention, for example, other optical devices that can still improve the coupling efficiency can be added in the technical solutions. It will be appreciated by those skilled in the art that modifications and equivalents may be made to the invention to the same technical effect, for example applying the tuning principles described in the present invention to other types of optical microcavity based lasers; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (4)
1. A tunable optical microcavity doped laser comprising a second pump source (6) for generating 980nm or 1480nm pump light, a doped optical microcavity (7) doped with an active gain substance, a coupling device (3) and a wavelength division multiplexer (8), the second pump source (6), the doped optical microcavity (7) and the wavelength division multiplexer (8) being connected by the coupling device (3), characterized in that: the optical fiber coupling device comprises a doped optical microcavity (7) and a temperature control device (4), wherein the doped optical microcavity (7) is positioned in the temperature control range of the temperature control device (4), the temperature of the doped optical microcavity (7) is tuned through the temperature control device (4), so that the volume and the effective refractive index of the doped optical microcavity (7) are changed, the resonance emergent wavelength in a gain spectrum is changed, the tuning of the output wavelength of a laser is realized, the coupling device (3) is any one of an optical fiber cone, an optical fiber with one end being polished obliquely, a waveguide and a prism, and the doped optical microcavity is an echo wall type optical microcavity;
the device realizes the tuning of the output wavelength of the laser through the temperature control device (4) by the following specific method:
if the doped optical microcavity adopts a micro-ring type optical microcavity, the resonant wavelength of the micro-ring type optical microcavity can be written as a form of formula (1):
in the formula (1), lambdaMIs the wavelength of laser in vacuum in M (M is positive integer) order resonance mode, R is the radius of the microdisk, neffThe effective refractive index of the whispering gallery mode is changed, the resonance emergent wavelength in the gain spectrum is changed by changing the resonance wavelength condition of the formula (1), the tuning of the output wavelength of the laser can be realized, when the temperature of the microcavity is changed, the refractive index of the microcavity volume and the microcavity material is changed, and therefore the microcavity resonance wavelength equation related to the temperature change is obtained as follows:
based on the formula (2), the tuning of the output wavelength of the laser can be realized by changing the temperature of the microcavity.
2. The tunable optical microcavity-doped laser of claim 1, wherein: and the polarization controller (5) is connected between the second pump source (6) and the coupling device (3).
3. The tunable optical microcavity-doped laser of claim 1 or 2, wherein: the active gain material includes at least one rare earth ion.
4. The tunable optical microcavity-doped laser of claim 1 or 2, wherein: the inner surface of the doped optical microcavity (7) is provided with a coating, and the coating is a metal material coating or a graphene material coating.
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| CN109818245B (en) * | 2016-04-20 | 2020-03-31 | 安徽大学 | Micro-cavity chip type laser self-mixing distance sensing system |
| JP2018059851A (en) * | 2016-10-06 | 2018-04-12 | 株式会社東芝 | Temperature measurement device |
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| CN104934850A (en) | 2015-09-23 |
| CN104934850B (en) | 2018-09-11 |
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