CN1874085A - Simple, high performance, tunable Q adjusted laser of doubly coated fiber - Google Patents
Simple, high performance, tunable Q adjusted laser of doubly coated fiber Download PDFInfo
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- CN1874085A CN1874085A CN 200610028426 CN200610028426A CN1874085A CN 1874085 A CN1874085 A CN 1874085A CN 200610028426 CN200610028426 CN 200610028426 CN 200610028426 A CN200610028426 A CN 200610028426A CN 1874085 A CN1874085 A CN 1874085A
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Abstract
The doubly coated fiber includes outer cladding, inner cladding, and fiber core. Grating of optical fiber is graved on one end of the fiber. Adjusting unit for the grating is positioned outside the grating. Lens of resonant cavity is located at the other end of the fiber. A V-type notch is made at side face at middle part of the fiber, and a V-type notch pump system is aimed at the V-type notch. The pump system is composed of diode pump source, lens set, and transparent substrate arranged from outer to fiber core. The adjusting unit includes a portion of plastic sleeve sheathed on the grating skin to skin. The plastic sleeve is griped between base of arc chute and metal spring piece in toughness, and fixed by bolts sheathed in springs. Features are: compact structure, flexible, easy of turning, small insertion loss, and great increased efficiency of outputting layer.
Description
Technical field
The present invention relates to the passive Q-adjusted double-clad optical fiber laser of short pulse, the double-clad optical fiber laser of particularly tunable, narrow linewidth, several nanoseconds of pulse duration, high-peak power.
Technical background
Tunable narrow linewidth, short pulse, high-peak power laser have crucial application in fields such as laser ranging, materials processing, communication, remote sensing, defence engineerings.Formerly technology adopts laser diode (LD) pulse ends face pumping double-clad optical fiber laser, output linewidth 1.6nm, the nano second laser pulse of centre wavelength 1098nm.Referring to document [Electron.Lett.15:652-654,2003], the face pumping of employing pulse ends may produce the damage to the pumped fiber end face.Document is not controlled the spectrum of output laser, does not possess tunablely, and spectrum stability is poor.Because along with the long-term continuous operation of laser, the thermal effect problem is drifted about the output laser spectroscopy.Formerly technical literature [Opt.Lett.29:724-726,2004] adopts two block space grating pairs to mix outside the chamber and transfers the optical maser wavelength of Q output to carry out tuning.The space grating tuning range is big, line width though adopt, but increased the complexity of resonant cavity and regulated difficulty, and the insertion loss is very big, because monolithic reflecting grating diffraction efficiency is at 20%-40%, most laser energy has been depleted, so delivery efficiency is lower.
Summary of the invention
The present invention is intended to overcome the deficiency of above-mentioned technology formerly, and a kind of Q-switched double cladded fiber laser of Simple, high performance, tunable is provided, this laser should have compact conformation, flexible, tuning simple and convenient, to insert loss little, improves the output lasing efficiency greatly.
Concrete technical scheme of the present invention is as follows:
A kind of Q-switched double cladded fiber laser of Simple, high performance, tunable, it is characterized in that comprising that one has surrounding layer, the doubly clad optical fiber of inner cladding and fibre core, on the fibre core of this doubly clad optical fiber one end, carve and be provided with fiber grating, it outside this fiber grating a fiber grating adjusting device, outside the other end of described doubly clad optical fiber, be provided with a resonator mirror, the medial side face of described doubly clad optical fiber has a V-type notch and aims at this V-type notch a V-type groove pumping system, this V-type groove pumping system from export-oriented fibre core by laser diode pumping source, set of lenses) and transparent substrates form, described optical grating regulating device comprises: the described fiber grating of a confession) be close to sheathed plastic bushing, this plastic bushing is placed on one and has clamping between the substrate of deep-slotted chip breaker and the metal toughness spring, utilizes a plurality of screw that are with spring.
Described resonator mirror has high reflectance to laser and pumping laser.
The both ends of the surface of the fibre core of described doubly clad optical fiber have a little inclination angle, to prevent Fresnel reflection.
The diameter of the fibre core of described said doubly clad optical fiber＜10 μ m.
Laser diode pumping source is by the side pulse pump doubly clad optical fiber of optical fiber, and light wave electric vector and fiber core effect have produced electrostriction, produce acoustic wavefield then in fiber core, and diffraction takes place when this acoustic wavefield of light wave process.Periodically acoustic wavefield transient state feedback has realized the passive Q-adjusted of fiber laser.Utilize the doubly clad optical fiber optical grating regulating device to suppress fiber grating at last, the refractive index that changes grating inside reaches the tuning of output optical maser wavelength.
Technique effect of the present invention:
The present invention adopts V-type serrated pulse profile pump, has avoided the damage of end pumping to the optical-fiber laser end face.And the selection of pumping point is very flexible, can any point selection pumping in fiber segment.
With formerly adopt grating pair to compare outside the technology chamber, the present invention as wavelength selector, makes fiber laser compactness, simple with direct doubly clad optical fiber Bragg grating, has avoided extra insertion loss, has improved the laser delivery efficiency.
The present invention utilizes a kind of simple machinery to suppress the selection that device comes tunable fiber grating pair optical maser wavelength, can replace the tunning effect of space grating to a certain extent; But the drift of the laser work wavelength that the thermal effect that compensate for laser work produces is brought, the stability of raising resonant cavity.
Description of drawings
Fig. 1 is the tunable Q-switched double cladded fiber laser schematic diagram of the simple high efficiency of the present invention;
Fig. 2 is a fiber grating adjusting device schematic diagram of the present invention.
Embodiment
Please consult Fig. 1 and Fig. 2 earlier, Fig. 1 is the simple high efficiency Tunable Q-switched of a present invention double-clad optical fiber laser schematic diagram, and Fig. 2 is a fiber grating adjusting device schematic diagram of the present invention.The simple high efficiency Tunable Q-switched of the present invention double-clad optical fiber laser as seen from the figure, it is characterized in that comprising that one has surrounding layer 2, the doubly clad optical fiber of inner cladding 3 and fibre core 4, on the fibre core 4 of this doubly clad optical fiber one end, carve and be provided with fiber grating 9, it outside this fiber grating 9 a fiber grating adjusting device 10, outside the other end of described doubly clad optical fiber, be provided with a resonator mirror 1, the medial side face of described doubly clad optical fiber has a V-type notch and aims at this V-type notch a V-type groove pumping system 5, this V-type groove pumping system 5 from export-oriented fibre core 4 by laser diode pumping source 7, set of lenses 8 and transparent substrates 6 are formed, described optical grating regulating device 10 comprises: one supplies described fiber grating 9 to be close to sheathed plastic bushing 14, this plastic bushing 14 is placed on one and has clamping between the substrate 15 of deep-slotted chip breaker and the metal toughness spring 13, utilizes a plurality of screws 12 that are with spring 11 fixing.
Pump light enters in the double clad inner cladding by V-type groove side, goes by repeatedly reflecting to be coupled in the fibre core.Because pump light and fiber core effect, nonlinear effect produces excited Brillouin and transfers the Q short pulse.Regulate the screw belt spring plate extruding doubly clad optical fiber grating in the fiber grating adjusting device, select within the specific limits or change optical maser wavelength.
The parameter of lifting a specific embodiment below is described below:
Adopting doubly clad optical fiber length is 18m, and Yb mixes in the fibre core
3+Inner cladding is of a size of 100 * 200 μ m (NA=0.47), core diameter is 6 μ m (NA=0.16), LD pumping wavelength 975nm, fiber grating centre wavelength 1080nm, the pulse energy that can obtain improves greatly, pulse duration is at 3ns-5ns, live width is lower than 0.1nm, and by regulating the light grating, the optical maser wavelength tuning range is greater than 20nm.
In sum, experiment of the present invention shows and compares in preceding technology, the present invention have compact conformation, flexible, tuning simple and convenient, to insert loss little, improved the output lasing efficiency greatly.
Claims (4)
1, a kind of Q-switched double cladded fiber laser of Simple, high performance, tunable, it is characterized in that comprising that one has surrounding layer (2), the doubly clad optical fiber of inner cladding (3) and fibre core (4), fibre core (4) at this doubly clad optical fiber one end upward is provided with fiber grating (9) quarter, it outside this fiber grating (9) a fiber grating adjusting device (10), outside the other end of described doubly clad optical fiber, be provided with a resonator mirror (1), the medial side face of described doubly clad optical fiber has a V-type notch and aims at this V-type notch a V-type groove pumping system (5), this V-type groove pumping system (5) from export-oriented fibre core (4) by laser diode pumping source (7), set of lenses (8) and transparent substrates (6) are formed, described optical grating regulating device (10) comprising: one supplies described fiber grating (9) to be close to sheathed plastic bushing (14), this plastic bushing (14) is placed on one and has clamping between the substrate (15) of deep-slotted chip breaker and the metal toughness spring (13), utilizes a plurality of screws (12) that are with spring (11) fixing.
2, double-clad optical fiber laser according to claim 1 is characterized in that described resonator mirror (1) has high reflection to laser and pumping laser.
3, said doubly clad optical fiber in the claim 1 is characterized in that the both ends of the surface of the fibre core (4) of doubly clad optical fiber have a little inclination angle, to prevent Fresnel reflection.
4, double-clad optical fiber laser according to claim 1 is characterized in that the diameter＜10 μ m of the fibre core (4) of described said doubly clad optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610028426 CN1874085A (en) | 2006-06-30 | 2006-06-30 | Simple, high performance, tunable Q adjusted laser of doubly coated fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610028426 CN1874085A (en) | 2006-06-30 | 2006-06-30 | Simple, high performance, tunable Q adjusted laser of doubly coated fiber |
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| CN1874085A true CN1874085A (en) | 2006-12-06 |
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| CN 200610028426 Pending CN1874085A (en) | 2006-06-30 | 2006-06-30 | Simple, high performance, tunable Q adjusted laser of doubly coated fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101291037B (en) * | 2007-02-13 | 2010-06-02 | 骆飞 | Q-switched all-optical fiber laser |
| CN103259170A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Ultrasound induction long-periodic fiber bragg grating Q-switched pulse continuous dual-purpose optical fiber laser |
-
2006
- 2006-06-30 CN CN 200610028426 patent/CN1874085A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101291037B (en) * | 2007-02-13 | 2010-06-02 | 骆飞 | Q-switched all-optical fiber laser |
| CN103259170A (en) * | 2013-04-22 | 2013-08-21 | 西北大学 | Ultrasound induction long-periodic fiber bragg grating Q-switched pulse continuous dual-purpose optical fiber laser |
| CN103259170B (en) * | 2013-04-22 | 2016-05-11 | 西北大学 | Supersonic induced LPFG Q impulse and continuous dual-purpose optical fiber laser |
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