CN204680898U - Tunable liquid microsphere laser device - Google Patents
Tunable liquid microsphere laser device Download PDFInfo
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- CN204680898U CN204680898U CN201520371797.6U CN201520371797U CN204680898U CN 204680898 U CN204680898 U CN 204680898U CN 201520371797 U CN201520371797 U CN 201520371797U CN 204680898 U CN204680898 U CN 204680898U
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Abstract
The utility model provides a kind of tunable liquid microsphere laser device.First catches light source (1), second catches light source (2) and pump light source (3) and is connected to respectively by isolator and excites control section (7), excite control section (7) to be connected to photodetector (9) by 1x2 coupler (8), the another port of 1x2 coupler (8) is Laser output port; Excite control section (7) to comprise first to catch optical fiber (7a), second and catch optical fiber (7b), pump light input optical fibre (7c), Laser output optical fiber (7d) and liquid microballoon (7e), liquid microballoon is positioned between pump light input optical fibre (7c) and Laser output optical fiber (7d); Comprise active laser medium in liquid microballoon and be placed in exterior clear liquid medium (7f).The utility model adopts optical fiber optical tweezers technology, optical resonance principle and Principles of Laser, proposes a kind of tunable liquid microsphere laser device, has stability high, easily manipulate, high q-factor, exports the advantages such as threshold value is low.
Description
Technical field
The utility model relates to a kind of laser, specifically a kind of have the stable tunable liquid microsphere laser device exported.
Background technology
Microsphere laser is the microcavity laser based on Whispering-gallery-mode (Whispering Gallery Modem, WGM).WGM has long coherence length, narrow spectral line width, and the features such as Low threshold, high transformation efficiency, High Speed Modulation, have high quality factor (Q value) and the frequency range covering power of minimum mode volume and non-constant width based on the microsphere laser in WGM institute.As far back as people such as C.G.B.Garrett in 1961, divalence Sm ion is mixed CaF
2in crystal, then be ground into the spherical of diameter 1 ~ 2 millimeter, under Flashlamps exciting, observed stimulated light emission, this is microsphere laser device the earliest.Thereafter, along with the development of coupled wave theory and the generation of various coupled apparatus, spherical microcavity in a lot of fields in obtain research and development widely.
The experimental study of early stage Whispering-gallery-mode is mainly in microwave band, until 20 century 70s, the development of laser spectrum tech, extend to optical region by the research of Whispering-gallery-mode.1989, the people such as the Braginsky of Russia melt glass optical fiber by burning, successfully prepare stable solid glass Microsphere Cavities (Quality-factor and nonlinear properties ofoptical whispering-gallery modes.PhysLett A in an experiment, 1989,137:393 – 397), and prove that in the ball chamber of diameter 150 microns, Q value is up to 10
8.Its relatively simple preparation method and stability, be promoted rapidly, a large amount of experimental study groups puts in the research field of Whispering-gallery-mode.At present, the microspheres with solid laser of the pole Low threshold containing different alloy is realized by many people.But use grinding or burn the obtained microspheres with solid of mode of melting, its surface roughness all cannot compared with the liquid microballoon formed due to surface tension of liquid, and therefore, liquid microballoon has more outstanding advantage.
In fact, the research work of liquid microsphere laser device is compared microspheres with solid laser and is taken early many years.1977, the people such as the Ashkin radiation pressure enhancement effect that First Observation causes to Whispering-gallery-mode in the light tweezer experiment of manipulation miniature spherical water droplet, the Chang of Yale University teaches research group and then in the fluorescence spectrum of the polymer microballoon of dopant dye, has directly observed the resonance peak that high q-factor Whispering-gallery-mode is corresponding in 1980.1986, the Qian Shixiong of Fudan University is during access Yale University, laser (the Lasing droplet:high-lighting the liquid-air interface by laseremission.Science of Low threshold is achieved in spherical droplets, 1986,231:486 – 488), wherein use the method for mechanical oscillation to control the droplet size of dye solution, use exciting light to irradiate the fall trajectory region of bead, obtain liquid microsphere laser.The shortcoming of this method is macro-mechanical vibration inaccuracy, and drop has great unsteadiness, is difficult to realize stable Laser output.Just because of the unsteadiness of drop, make the liquid microsphere laser device progress of achieving no breakthrough property in a very long time in the past.
Summary of the invention
It is high that the utility model object is to provide a kind of stability, easily manipulates, and Q value is high and have the tunable liquid microsphere laser device of extremely low output threshold value.
The purpose of this utility model is achieved in that comprising first catches light source 1, second catches light source 2, pump light source 3, excite control section 7, photodetector 9, described excite control section 7 to comprise first to catch optical fiber 7a, second catches optical fiber 7b, pump light input optical fibre 7c, Laser output optical fiber 7d and liquid microballoon 7e, first catches light source 1 connects first through the first isolator 4 and catches optical fiber 7a and form the first optical fiber optical tweezers, second catches light source 2 connects second through the second isolator 5 and catches optical fiber 7b and form the second optical fiber optical tweezers, pump light source 3 connects pump light input optical fibre 7c through the 3rd isolator 6, Laser output optical fiber 7d is connected to photodetector 9 by a port of 1 × 2 coupler 8, the another port of 1 × 2 coupler 8 is Laser output port, liquid microballoon 7e is between pump light input optical fibre 7c and Laser output optical fiber 7d, comprise active laser medium in described liquid microballoon 7e and be placed in exterior clear liquid medium 7f.
The utility model can also comprise:
1, the distance between pump light input optical fibre 7c and Laser output optical fiber 7d and liquid microballoon 7e is adjustable.
2, the diameter of liquid microballoon 7e is between several microns to 100 microns.
3, exterior clear liquid medium 7f and liquid microballoon 7e medium objectionable intermingling.
Active laser medium in the utility model can be organic fluorescent dye, rare earth ion, quantum dot or other fluorescent media.
Optical fiber optical tweezers technology is applied in liquid microsphere laser device by the utility model, can choose accurately and manipulation liquid microballoon, propose a kind of can steady operation there is the tunable spherical droplets laser of high q-factor, pole Low threshold.Meanwhile, can by changing the spacing of coupled fiber and liquid microballoon or changing the refractive index of liquid microballoon, the intensity of regulation output laser and phase place; By change liquid microballoon volume or the kind of the laser active material that adulterates, the selection of Output of laser wavelength can be carried out.
Its operation principle of the present utility model is:
Microsphere laser in the utility model utilizes the liquid Microsphere Cavities of high q-factor Whispering-gallery-mode (Whispering Gallery Modem, WGM) and obtains.
WGM just refers to that the light wave be coupled in microballoon constantly carries out total reflection at microcavity inner surface, thus to be constrained in ball and to detour along the great circle on the equatorial plane of ball, when the light wave detoured meets certain phase-matching condition, mutually can superpose enhancing, as shown in Figure 3; And the light field outside ball is near field, namely the evanescent wave (evanescent wave) of ball near surface is confined to, it is a kind of non-propagating ripple, the amplitude of light field exponentially declines in the radius vector direction of microballoon, therefore the average energy stream appeared in ball ball is zero, and this has high quality factor and minimum mode volume with regard to making the microballoon under Whispering-gallery-mode.
We use two stable catching and handle a liquid microballoon of optical fiber optical tweezers, the pump light of input optical fibre end outgoing is made to inject in liquid microballoon, light is propagated with WGM in liquid microballoon, light excites the laser active material adulterated in liquid microballoon while continuous accumulation increases, thus producing more light, the light in liquid microballoon constantly strengthens, when light intensity acquires a certain degree, light is overflowed and is coupled into output optical fibre in liquid microballoon, realizes exciting and output of laser.Thus, use optical fiber by after faint optical signal feed liquor body microballoon, light intensity can be made to strengthen much doubly also stable output.The refractive index of the Distance geometry liquid microballoon of input and output coupled fiber and liquid microballoon affects the coupling coefficient of light constrained input, thus can the intensity of tuning operation laser and phase place; The diameter of liquid microballoon and the kind of laser active material then affect the wavelength of Output of laser, thus can carry out tuning to the optical maser wavelength exported.
Compared by prior art, the utility model has the advantage of:
1. the utility model gives a kind of tunable liquid microsphere laser device based on two optical fiber optical tweezers, make liquid microsphere laser keep stable to export, there is high Q value and extremely low output threshold value, and there is the outstanding advantages such as tuning methods is simple, tunable bandwidth.
2. tunable liquid microsphere laser device can realize low-loss with all optical fiber system well and is connected, simultaneously very low to the requirement of excitation energy, is highly suitable for the field that optical signal amplification etc. has particular/special requirement.
Accompanying drawing explanation
Fig. 1 is the structural representation of tunable liquid microsphere laser device;
Fig. 2 be tunable liquid microsphere laser device excite control section structural representation;
Fig. 3 (a) to (b) propagates the transmission path schematic diagram being for light in microballoon with Whispering-gallery-mode, wherein: Fig. 3 (a) completes one week through eight secondary reflections for light; Fig. 3 (b) completes one week through 16 times for light.
Embodiment
As shown in Figure 1, basic scheme of the present utility model:
Build two optical fiber optical tweezers system, use two optical fiber optical tweezers choose the suitable liquid microballoon 7e of diameter in doped with the liquid microballoon 7e suspension-turbid liquid of laser active material and caught, liquid microballoon 7e is moved in suitable exterior clear liquid medium 7f; The pump light input optical fibre 7c connected is held and Laser output optical fiber 7d end close liquid microballoon 7e on the same circumference different directions of liquid microballoon 7e, open pump light light source 3, regulate the spacing of input and output coupled fiber and liquid microballoon 7e and observed the output situation of laser by photodetector 9, realizing the output of liquid microsphere laser.
Illustrate concrete manufacture method of the present utility model below.
Specific embodiment 1, a kind of realization of liquid microsphere laser device, and carry out tuning to the light intensity of Output of laser and phase place.
Step is as follows:
1, optical system is built:
1. two wavelength are selected to be that the laser of 980 nanometers is as catching light source, first catches light source 1 and the second output of catching light source 2 is welded to the first isolator 4 and the second isolator 5, the output of isolator is all welded a segment standard monomode fiber, the tail end of monomode fiber is removed coat about 30 millimeters and cuts smooth, form first to catch optical fiber 7a and hold and second catch optical fiber 7b and hold, realize a set of pair of optical fiber optical tweezers;
2. centre wavelength is selected to be that the laser of 532 nanometers is as pump light source 3, the output of pump light source 3 is welded to the 3rd isolator 6, the output of isolator is welded a segment standard monomode fiber, the tail end of monomode fiber is removed coat about 30 millimeters and cuts smooth, forms pump light input optical fibre 7c end;
3. coat about 30 millimeters removed at segment standard monomode fiber two ends and cut smooth, one end is held as Laser output optical fiber 7d, the other end is soldered to single port one end of 1 × 2 coupler 8, a port of 1 × 2 coupler 8 other end is connected to photodetector 9 (spectrometer), and another port is as laser output.
2, the preparation of liquid microballoon:
1. in liquid crystal, mix the DCM dyestuff of 10%, mixed liquor is put into ultrasonic cleaners and carry out ultrasonic vibration about 30 minutes, liquid crystal is fully mixed with dyestuff;
2. in the liquid crystal being mixed with dyestuff, add the distilled water of about liquid crystal volume 10 times, again put into ultrasonic cleaners and carry out ultrasonic vibration, liquid to be mixed takes out when forming milky suspension-turbid liquid, the suspension-turbid liquid of the obtained liquid microballoon 7e (liquid crystal microballoon) containing various diameter.
3, the choosing of liquid microballoon:
1. the liquid crystal suspension-turbid liquid got described in a step 2-2 drops on slide, and use two optical fiber optical tweezers in liquid crystal suspension-turbid liquid, choose the liquid crystal microballoon 7e that a diameter is several microns to 100 microns, liquid crystal microballoon 7e diameter selected in the present embodiment is 20 microns;
2. use optical fiber optical tweezers to move in transparent liquid medium 7f by selected liquid crystal microballoon 7e, in the present embodiment, according to the solution of liquid crystal suspension-turbid liquid, select distilled water as transparent liquid medium 7f.
4, pump light input optical fibre 7c end and Laser output optical fiber 7d end are placed in same level, and make from relative position its end face press close to liquid crystal microballoon 7e.
5, open pump light source 3, regulate the distance of pump light input optical fibre 7c and Laser output optical fiber 7d and liquid crystal microballoon 7e, observe Laser output situation by spectrometer 9, in the present embodiment, the Output of laser centre wavelength of liquid bead laser is about 630 nanometers simultaneously.
6, the distance by changing pump light input optical fibre 7c and Laser output optical fiber 7d and liquid crystal microballoon 7e observes the change of Output of laser light intensity and phase place; Also can by changing dye adulterated concentration thus the mode changing liquid crystal microballoon (7e) refractive index carries out the tuning of Output of laser light intensity and phase place.
Specific embodiment 2, a kind of realization of liquid microsphere laser device, and the wavelength of Output of laser is chosen.
Step is as follows:
1, optical system is built:
1. two wavelength are selected to be that the laser of 980 nanometers is as catching light source, first catches light source 1 and the second output of catching light source 2 is welded to the first isolator 4 and the second isolator 5, the output of isolator is all welded a segment standard monomode fiber, the tail end of monomode fiber is removed coat about 30 millimeters and cuts smooth, form first to catch optical fiber 7a and hold and second catch optical fiber 7b and hold, realize a set of pair of optical fiber optical tweezers;
2. centre wavelength is selected to be that the laser of 532 nanometers is as pump light source 3, the output of pump light source 3 is welded to the 3rd isolator (6), the output of isolator is welded a segment standard monomode fiber, the tail end of monomode fiber is removed coat about 30 millimeters and cuts smooth, forms pump light input optical fibre 7c end;
3. coat about 30 millimeters removed at segment standard monomode fiber two ends and cut smooth, one end is held as Laser output optical fiber 7d, the other end is soldered to single port one end of 1 × 2 coupler 8, a port of 1 × 2 coupler 8 other end is connected to photodetector 9 (spectrometer), and another port is as laser output.
2, the preparation of liquid microballoon:
1. in liquid crystal, mix the DCM dyestuff of 10%, mixed liquor is put into ultrasonic cleaners and carry out ultrasonic vibration about 30 minutes, liquid crystal is fully mixed with dyestuff;
2. in the liquid crystal being mixed with dyestuff, add the distilled water of about liquid crystal volume 10 times, again put into ultrasonic cleaners and carry out ultrasonic vibration, liquid to be mixed takes out when forming milky suspension-turbid liquid, the suspension-turbid liquid of the obtained liquid microballoon 7e (liquid crystal microballoon) containing various diameter.
3, the choosing of liquid microballoon:
1. the liquid crystal suspension-turbid liquid got described in a step 2-2 drops on slide, and use two optical fiber optical tweezers in liquid crystal suspension-turbid liquid, choose the liquid crystal microballoon 7e that a diameter is several microns to 100 microns, liquid crystal microballoon 7e diameter selected in the present embodiment is 20 microns;
2. use optical fiber optical tweezers to move in transparent liquid medium 7f by selected liquid crystal microballoon 7e, in the present embodiment, according to the solution of liquid crystal suspension-turbid liquid, select distilled water as transparent liquid medium 7f.
4, pump light input optical fibre 7c end and Laser output optical fiber 7d end are placed in same level, and make from relative position its end face press close to liquid crystal microballoon 7e.
5, open pump light source 3, regulate the distance of pump light input optical fibre 7c and Laser output optical fiber 7d and liquid crystal microballoon 7e, observe Laser output situation by spectrometer 9, in the present embodiment, the Output of laser centre wavelength of liquid bead laser is about 630 nanometers simultaneously.
6, by choosing the liquid crystal microballoon 7e of different-diameter, the change of observation Output of laser centre wavelength; Also can by change in liquid microballoon 7e the mode of laser active material kind of adulterating carry out choosing of Output of laser centre wavelength.
Claims (3)
1. a tunable liquid microsphere laser device, comprise first and catch light source (1), second catches light source (2), pump light source (3), excite control section (7), photodetector (9), described excite control section (7) to comprise first to catch optical fiber (7a), second catches optical fiber (7b), pump light input optical fibre (7c), Laser output optical fiber (7d) and liquid microballoon (7e), it is characterized in that: first catches light source (1) connects first through the first isolator (4) and catch optical fiber (7a) and form the first optical fiber optical tweezers, second catches light source (2) connects second through the second isolator (5) and catches optical fiber (7b) and form the second optical fiber optical tweezers, pump light source (3) connects pump light input optical fibre (7c) through the 3rd isolator (6), Laser output optical fiber (7d) is connected to photodetector (9) by a port of 1 × 2 coupler (8), the another port of 1 × 2 coupler (8) is Laser output port, liquid microballoon (7e) is positioned between pump light input optical fibre (7c) and Laser output optical fiber (7d), comprise active laser medium in described liquid microballoon (7e) and be placed in exterior clear liquid medium (7f).
2. tunable liquid microsphere laser device according to claim 1, is characterized in that: pump light input optical fibre (7c) and the distance between Laser output optical fiber (7d) and liquid microballoon (7e) adjustable.
3. tunable liquid microsphere laser device according to claim 1 and 2, is characterized in that: the diameter of liquid microballoon (7e) is between several microns to 100 microns.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993371A (en) * | 2015-06-02 | 2015-10-21 | 哈尔滨工程大学 | Tunable liquid microsphere laser |
| CN106654826A (en) * | 2016-12-31 | 2017-05-10 | 浙江师范大学 | Method for realizing laser output of microsphere laser based on sunlight pumping |
| CN112461830A (en) * | 2020-11-05 | 2021-03-09 | 山东建筑大学 | Combined transparent medium microsphere small-sized optical tweezers device and application |
| CN112834410A (en) * | 2021-01-04 | 2021-05-25 | 桂林电子科技大学 | Sheet light microscopic imaging method and device based on double-core optical fiber light control |
-
2015
- 2015-06-02 CN CN201520371797.6U patent/CN204680898U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993371A (en) * | 2015-06-02 | 2015-10-21 | 哈尔滨工程大学 | Tunable liquid microsphere laser |
| CN104993371B (en) * | 2015-06-02 | 2018-02-13 | 哈尔滨工程大学 | Tunable liquid microsphere laser device |
| CN106654826A (en) * | 2016-12-31 | 2017-05-10 | 浙江师范大学 | Method for realizing laser output of microsphere laser based on sunlight pumping |
| CN112461830A (en) * | 2020-11-05 | 2021-03-09 | 山东建筑大学 | Combined transparent medium microsphere small-sized optical tweezers device and application |
| CN112834410A (en) * | 2021-01-04 | 2021-05-25 | 桂林电子科技大学 | Sheet light microscopic imaging method and device based on double-core optical fiber light control |
| CN112834410B (en) * | 2021-01-04 | 2022-09-13 | 桂林电子科技大学 | Sheet light microscopic imaging method and device based on double-core optical fiber light control |
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