CN108899750B - Porous channel hollow micro-node whispering gallery mode resonant cavity and preparation method thereof - Google Patents
Porous channel hollow micro-node whispering gallery mode resonant cavity and preparation method thereof Download PDFInfo
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- CN108899750B CN108899750B CN201810695455.8A CN201810695455A CN108899750B CN 108899750 B CN108899750 B CN 108899750B CN 201810695455 A CN201810695455 A CN 201810695455A CN 108899750 B CN108899750 B CN 108899750B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08013—Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate
Abstract
The invention belongs to the field of optical devices, and discloses a multi-channel hollow micro-junction whispering gallery mode resonant cavity and a preparation method thereof. Drawing the middle part of the porous glass capillary tube into hollow micro-nano fibers with the outer diameter of 0.5-10 mu m by using a melt drawing method, and knotting by micro-operation to form a hollow micro-knot cavity; and injecting a liquid gain medium into the fiber pore channel of the hollow micro-node cavity in a capillary force suction or external force injection mode, then coupling with the tapered optical fiber, and packaging to obtain the porous-channel hollow micro-node whispering gallery mode resonant cavity. The preparation process is simple, the prepared hollow micro-junction cavity can be sucked by means of capillary force or injected into various liquid gain media by means of external force, and the obtained multi-channel hollow micro-junction echo wall mode resonant cavity is provided with a plurality of gain channels and can realize low-threshold, high-slope efficiency and high-power echo wall laser output.
Description
Technical Field
The invention belongs to the field of optical devices, and particularly relates to a multi-channel hollow micro-junction whispering gallery mode resonant cavity and a preparation method thereof.
Background
The echo wall optical microcavity has extremely high quality factor and extremely small mode volume, can limit light in the cavity to enhance the interaction between the light and the substance, and has important application prospect in the fields of integrated optical path, information processing, sensing and the like. The micro-junction echo wall micro-cavity is formed by knotting micro-nano fibers on a micro-operation platform to form an annular resonant cavity with the diameter of tens to hundreds of microns. Compared with the traditional micro optical resonant cavity etched by a semiconductor, the micro-junction echo wall micro-cavity has the advantages of simple structure, convenient operation and low cost, and can meet the application requirements of different fields. And the micro-junction echo wall micro-cavity can flexibly design ring structures (such as double rings, multiple rings, asymmetric rings and the like), so that tunable output of a laser mode is realized.
At present, the micro-junction echo wall microcavity is prepared from solid active micro-nano fibers, the gain medium applicable to the micro-junction echo wall microcavity is limited, and only laser output of the active micro-nano fibers can be realized. And although low threshold laser output is available in whispering gallery mode microchambers, the slope efficiency and output power of the laser is generally low.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention aims to provide a preparation method of a multi-channel hollow micro-junction whispering gallery mode resonant cavity. The preparation method provided by the invention is simple in process, is suitable for various gain media, is internally provided with a plurality of gain channels, and increases the optical path on the premise of keeping low loss, so that the slope efficiency and power of laser output are improved.
The invention also aims to provide the multi-channel hollow micro-node whispering gallery mode resonator prepared by the method.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a porous channel hollow micro-node whispering gallery mode resonant cavity comprises the following preparation steps:
(1) drawing the middle part of the porous glass capillary tube into a hollow micro-nano fiber with the outer diameter of 0.5-10 mu m by a melt drawing method;
(2) knotting the micro-nano fibers in the step (1) through micro-operation to form a hollow micro-knot cavity;
(3) injecting the liquid gain medium into the fiber pore channel of the hollow micro-cavity in the step (2) in a capillary force suction or external force injection mode;
(4) and (4) drawing the commercial optical fiber into a tapered optical fiber on a tapered platform, coupling the tapered optical fiber with the hollow micro-junction cavity obtained in the step (3), and packaging to obtain the multi-pore hollow micro-junction whispering gallery mode resonant cavity.
Further, the porous glass capillary in the step (1) is a quartz or other glass capillary with at least two holes. The outer diameter of the capillary is 100 mu m-5 mm, and the aperture is 20 mu m-1 mm.
By way of further illustration, a schematic diagram of the end face structure of the capillary tube with two holes and four holes is shown in fig. 1.
Further, the melting and drawing method in the step (1) is to melt the middle part of the capillary tube by using oxyhydrogen flame or a carbon dioxide laser or other heating sources, clamp two ends of the capillary tube by using a clamp, and uniformly stretch the capillary tube to two sides by using a stepping motor or other equipment to obtain the hollow micro-nano fiber with the outer diameter of 0.5-10 mu m and the aperture reduced according to the original inner-outer diameter ratio.
Furthermore, in the step (2), the diameter of the cavity of the hollow micro-cavity formed by micro-operation knotting is 20-500 μm, and two free ends which can be truncated and have the length of 5-5 mm are arranged at the knotted positions. The presence of the free end may facilitate the suction or injection of the liquid gain medium. By way of further illustration, a schematic diagram of the structure of the hollow micro-junction cavity is shown in fig. 2.
Further, in the step (3), the liquid gain medium is a laser dye or a nanocrystal solution uniformly dispersed in an organic solvent, or other liquid gain media capable of achieving laser output.
Further, the diameter of the tail part of the tapered optical fiber in the step (4) is 0.5-10 μm, and the length of the tapered optical fiber is 5-50 μm. The structure can effectively inject pump light into the hollow micro-junction cavity from the optical fiber transmitted by the traditional core cladding interface.
A porous channel hollow micro-node whispering gallery mode resonator is prepared by the method.
The porous channel hollow micro-junction echo wall resonant cavity is formed by melting and drawing a porous glass capillary tube to a micron or nanometer size level, and then forming an annular resonant cavity with the diameter of dozens to hundreds of microns by adopting micro-operation and a knotting mode. The microcavity can be sucked by capillary force, or liquid gain medium can be injected by external force, laser output is realized under excitation of the evanescent field of the tapered optical fiber, and the microcavity can be used for sensing and other applications. Compared with the conventional annular solid resonant cavity, the hollow micro-junction echo wall micro-cavity can be suitable for various liquid gain media, almost comprises all laser dyes and nanocrystalline solution uniformly dispersed in organic solvent, and the laser output covers ultraviolet, visible, near infrared and intermediate infrared wave bands.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the preparation process is simple, the prepared hollow micro-cavity can be sucked by capillary force or injected into various liquid gain media by external force, the hollow micro-cavity is suitable for various gain media, such as various laser dyes and nanocrystalline solutions uniformly dispersed in organic solvents, and the output laser wavelength can cover the band from ultraviolet to middle infrared.
(2) The multi-channel hollow micro-junction echo wall mode resonant cavity prepared by the method has a plurality of gain channels, and can realize low threshold, high slope efficiency and high-power echo wall laser output.
Drawings
FIG. 1 is a schematic diagram of the end face structure of a capillary tube having two and four holes according to the present invention.
FIG. 2 is a schematic structural diagram of the hollow micro-junction cavity of the present invention.
Fig. 3 is a schematic structural diagram of an optical path device formed by a multi-hole hollow micro-node whispering gallery mode resonator according to an embodiment of the present invention.
FIG. 4 is a diagram of a two-hole hollow micro-junction whispering gallery mode resonator (Nd-doped NaYF) obtained in example 1 of the present invention4Nanocrystals).
FIG. 5 shows a four-channel hollow micro-junction whispering gallery mode resonator (Nd-doped NaYF) obtained in example 2 of the present invention4Nanocrystals).
FIG. 6 is a laser spectrum of a two-channel hollow micro-junction whispering gallery mode resonator (Er and Yb co-doped YOF nanocrystal) obtained in example 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
(1) Two-hole quartz capillary tubes (outer diameter 3mm, inner diameter of about 0.5mm) were selected, and the length was cut to about 5 cm. Melting the middle part by using a carbon dioxide laser or oxyhydrogen flame or other heating sources, clamping two ends of the capillary tube by using a clamp, and uniformly stretching the capillary tube to the two ends by using a stepping motor to obtain the hollow micro-nano fiber with the diameter of 0.5-10 mu m and the length of about 1-10 mm.
(2) And then knotting the obtained micro-nano fibers into a hollow micro-knot cavity with the cavity diameter of about 250 mu m by adopting micro operation.
(3) Then Nd-doped NaYF is absorbed by capillary force or injected by external force4And (3) injecting a nano-crystal liquid gain medium (the diameter of the nano-crystal is about 5 nm-50 nm, the nano-crystal is dispersed in a cyclohexane solution, and the concentration of the solution is 0.2 mu M-5 mu M) into the fiber pore channel of the hollow micro-cavity in the step (2).
(4) Drawing a commercial optical fiber into a tapered optical fiber on a tapering platform, coupling the tapered optical fiber with the hollow micro-junction cavity obtained in the step (3), and packaging to obtain a two-hole hollow micro-junction whispering gallery mode resonant cavity (Nd-doped NaYF)4Nanocrystals).
The schematic structural diagram of the optical path device formed by the two-channel hollow micro-node whispering gallery mode resonant cavity is shown in fig. 3, and the optical path device is composed of a hollow micro-node cavity, a substrate (a magnesium fluoride substrate with the refractive index of 1.38 and the size of 1 multiplied by 2cm), an optical Wavelength Division Multiplexer (WDM), a semiconductor pump laser and an output port. In the embodiment, the pumping wavelength of the semiconductor pump laser is 808nm, the output power is tunable, and the output pigtail is a single-mode fiber. The commercial optical fiber is drawn into a tapered optical fiber (the diameter of the tapered tail part of the optical fiber is 0.5-10 mu m, the length of the tapered tail part of the optical fiber is 5-50 mu m), the tapered end is connected with the hollow micro-junction cavity, and the other end is connected with the tail fiber of the semiconductor pump laser. And tapering the common end of the optical wavelength division multiplexer and then connecting the common end with the hollow micro-junction cavity. Under the excitation of the semiconductor pump laser, the echo wall laser is output through an output port of the optical wavelength division multiplexer.
The two-hole hollow micro-junction whispering gallery mode resonator (Nd-doped NaYF) obtained in this example4Nanocrystals) of a crystal of siliconThe optical spectrum is shown in FIG. 4. As can be seen from FIG. 4, the laser output with a center wavelength around 1059nm is achieved with a power as high as 75 μ W (higher power laser output can be obtained if the pump source power is increased due to the limitation of the laboratory pump source power).
Example 2
(1) A four-hole quartz capillary tube (outer diameter of 3.5mm, diameter of four inner holes of about 0.5mm) was selected and cut to a length of about 5 cm. Melting the middle part by using a carbon dioxide laser or oxyhydrogen flame or other heating sources, clamping two ends of the capillary tube by using a clamp, and uniformly stretching the capillary tube to the two ends by using a stepping motor to obtain the hollow micro-nano fiber with the diameter of 0.5-10 mu m and the length of about 1-10 mm.
(2) And then knotting the obtained micro-nano fibers into a hollow micro-knot cavity with the cavity diameter of about 250 mu m by adopting micro operation.
(3) Then Nd-doped NaYF is absorbed by capillary force or injected by external force4And (3) injecting a nano-crystal liquid gain medium (the diameter of the nano-crystal is about 5 nm-50 nm, the nano-crystal is dispersed in a cyclohexane solution, and the concentration of the solution is 0.2 mu M-5 mu M) into the fiber pore channel of the hollow micro-cavity in the step (2).
(4) Drawing a commercial optical fiber into a tapered optical fiber on a tapering platform, coupling the tapered optical fiber with the hollow micro-junction cavity obtained in the step (3), and packaging to obtain a four-hole hollow micro-junction whispering gallery mode resonant cavity (Nd-doped NaYF)4Nanocrystals).
The schematic structural diagram of the optical path device formed by the four-channel hollow micro-node whispering gallery mode resonant cavity is shown in fig. 3, and the optical path device is composed of a hollow micro-node cavity, a substrate (a magnesium fluoride substrate with the refractive index of 1.38 and the size of 1 multiplied by 2cm), an optical Wavelength Division Multiplexer (WDM), a semiconductor pump laser and an output port. In the embodiment, the pumping wavelength of the semiconductor pump laser is 808nm, the output power is tunable, and the output pigtail is a single-mode fiber. The commercial optical fiber is drawn into a tapered optical fiber (the diameter of the tapered tail part of the optical fiber is 0.5-10 mu m, the length of the tapered tail part of the optical fiber is 5-50 mu m), the tapered end is connected with the hollow micro-junction cavity, and the other end is connected with the tail fiber of the semiconductor pump laser. And tapering the common end of the optical wavelength division multiplexer and then connecting the common end with the hollow micro-junction cavity. Under the excitation of the semiconductor pump laser, the echo wall laser is output through an output port of the optical wavelength division multiplexer.
The four-hole hollow micro-junction whispering gallery mode resonator (Nd-doped NaYF) obtained in this example4Nanocrystalline) is shown in fig. 5. As can be seen from FIG. 5, the laser output with the center wavelength of about 1061nm is realized with the power as high as 215 μ W (due to the limitation of the laboratory pumping source power, if the pumping source power is increased, the laser output with higher power can be obtained).
Example 3
(1) Two-hole quartz capillary tubes (outer diameter 3mm, inner diameter of about 0.5mm) were selected, and the length was cut to about 5 cm. Melting the middle part by using a carbon dioxide laser or oxyhydrogen flame or other heating sources, clamping two ends of the capillary tube by using a clamp, and uniformly stretching the capillary tube to the two ends by using a stepping motor to obtain the hollow micro-nano fiber with the diameter of 0.5-10 mu m and the length of about 1-10 mm.
(2) And then knotting the obtained micro-nano fibers into a hollow micro-knot cavity with the cavity diameter of about 250 mu m by adopting micro operation.
(3) And (3) injecting an Er and Yb co-doped YOF nano-crystal liquid gain medium (the diameter of the nano-crystal is about 5-50 nm, the nano-crystal is dispersed in a cyclohexane solution, and the concentration of the solution is 0.2-5 mu M) into the hollow micro-cavity in the step (2) by means of capillary force suction or external force injection.
(4) And (3) drawing the commercial optical fiber into a tapered optical fiber on a tapering platform, coupling the tapered optical fiber with the hollow micro-junction cavity obtained in the step (3), and packaging to obtain the hollow micro-junction whispering gallery mode resonant cavity (Er and Yb co-doped YOF nano crystal) with two pores.
The schematic structural diagram of the optical path device formed by the two-channel hollow micro-node whispering gallery mode resonant cavity is shown in fig. 3, and the optical path device is composed of a hollow micro-node cavity, a substrate (a magnesium fluoride substrate with the refractive index of 1.38 and the size of 1 multiplied by 2cm), an optical Wavelength Division Multiplexer (WDM), a semiconductor pump laser and an output port. In the embodiment, the pumping wavelength of the semiconductor pump laser is 808nm, the output power is tunable, and the output pigtail is a single-mode fiber. The commercial optical fiber is drawn into a tapered optical fiber (the diameter of the tapered tail part of the optical fiber is 0.5-10 mu m, the length of the tapered tail part of the optical fiber is 5-50 mu m), the tapered end is connected with the hollow micro-junction cavity, and the other end is connected with the tail fiber of the semiconductor pump laser. And tapering the common end of the optical wavelength division multiplexer and then connecting the common end with the hollow micro-junction cavity. Under the excitation of the semiconductor pump laser, the echo wall laser is output through an output port of the optical wavelength division multiplexer.
The laser spectrum of the two-channel hollow micro-junction whispering gallery mode resonator (Er and Yb co-doped YOF nanocrystal) obtained in this example is shown in fig. 6. As can be seen from fig. 6, this example achieves a laser output with a center wavelength around 1550 nm.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. A preparation method of a porous channel hollow micro-node whispering gallery mode resonant cavity is characterized by comprising the following preparation steps:
(1) drawing the middle part of the porous glass capillary tube into a hollow micro-nano fiber with the outer diameter of 0.5-10 mu m by a melt drawing method;
(2) knotting the micro-nano fibers in the step (1) through micro-operation to form a hollow micro-knot cavity;
(3) injecting the liquid gain medium into the fiber pore channel of the hollow micro-cavity in the step (2) in a capillary force suction or external force injection mode;
(4) drawing a commercial optical fiber into a tapered optical fiber on a tapered platform, coupling the tapered optical fiber with the hollow micro-junction cavity obtained in the step (3), and packaging to obtain the multi-pore hollow micro-junction echo wall mode resonant cavity;
the porous glass capillary in the step (1) is a quartz or other glass capillary with at least two holes; the outer diameter of the capillary is 100 mu m-5 mm, and the aperture is 20 mu m-1 mm.
2. The method for preparing the multi-channel hollow micro-junction whispering gallery mode resonator according to claim 1, wherein: the melting and drawing method in the step (1) is to melt the middle part of the capillary tube by using oxyhydrogen flame or a carbon dioxide laser, clamp two ends of the capillary tube by using a clamp, and uniformly draw the capillary tube to two sides by using a stepping motor to obtain the hollow micro-nano fiber with the outer diameter of 0.5-10 mu m and the aperture reduced according to the original inner-outer diameter ratio.
3. The method for preparing the multi-channel hollow micro-junction whispering gallery mode resonator according to claim 1, wherein: in the step (2), the diameter of the cavity of the hollow micro-cavity formed by micro-operation knotting is 20-500 μm, and two free ends which can be truncated and have the length of 5-5 mm are arranged at the knotted positions.
4. The method for preparing the multi-channel hollow micro-junction whispering gallery mode resonator according to claim 1, wherein: and (4) the liquid gain medium in the step (3) is laser dye or a nanocrystalline solution uniformly dispersed in an organic solvent.
5. The method for preparing the multi-channel hollow micro-junction whispering gallery mode resonator according to claim 1, wherein: in the step (4), the diameter of the tail part of the tapered optical fiber is 0.5-10 mu m, and the length of the tapered optical fiber is 5-50 mu m.
6. A porous channel hollow micro-node whispering gallery mode resonator is characterized in that: prepared by the method of any one of claims 1 to 5.
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| CN109809685B (en) * | 2019-03-18 | 2022-05-24 | 华南理工大学 | Microcrystalline glass whispering gallery mode resonant cavity capable of outputting single-mode high-performance laser and preparation method thereof |
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| CN112285838A (en) * | 2020-11-18 | 2021-01-29 | 海南大学 | Optical fiber echo wall resonator |
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