CN2770165Y - Optical fiber laser group beam laser - Google Patents

Abstract

The utility model relates to an optical fiber laser group beam laser, which comprises a plurality of double-clad optical fibers, wherein one end of each double-clad optical fiber is respectively connected with one pumping laser. After an outer cladding of the other end of each of the double-clad optical fibers is removed, the other end of each of the double-clad optical fibers is tightly arranged in an optical fiber clamp in a mode of a line array, and an even output end surface of an optical fiber array is formed and is positioned on one end of the inner part of a resonant cavity box. The other end of the resonant cavity box is provided with a plane-convex lens, the convex surface of the plane-convex lens is coated with an antireflection layer, and a plane is coated with a semitransparent reflection layer which faces to the outer part of the resonant cavity box. The distance between the output end surface of the optical fiber array and the semitransparent reflection layer is D, the distance between fiber cores on the output end surface of the optical fiber array is d, the focal length of the plane-convex lens is F, and D satisfy the following relational expressions: d< 2 >=(lambda/2) f and D=F/2. The utility model has the advantages that the structure is simple, the system is stable and practical, the coherent group beam of a plurality of optical fiber laser is convenient and the coherent output of high power is generated.

Description

Optical fiber laser group beam laser

Technical field

The utility model relates to fiber laser, particularly a kind of optical fiber laser group beam laser.

Background technology

In the various technology for the coherent combination of laser beam, utilizing exocoel to carry out coherent beam combination is a kind of very useful technology.Formerly in the technology, designed exocoel has spatial filter, need two lens and independent half-mirror, referring to technology [IEEE J.QuantumElectron.Vol.27:1582-1593 formerly, 1991], the coupling that the output laser of fiber array can be concerned with of this exocoel, but light path complexity, distance between all optical elements needs strict control, and the stability of whole system is not high, implements difficulty, in addition, because light beam repeatedly passes through the surface of each element when coming and going in resonant cavity, optical energy loss is bigger, is unfavorable for the raising of whole system power.

Summary of the invention

The purpose of this utility model is to overcome the deficiency of above-mentioned technology formerly, and a kind of optical fiber laser group beam laser is provided, and with simplified structure, improves stability, compactedness and the power output of this system.

The utility model technical solution is:

A kind of optical fiber laser group beam laser, comprise many doubly clad optical fibers, every doubly clad optical fiber one end connects a pump laser, the other end that it is characterized in that described many doubly clad optical fibers is removed surrounding layer, closely be arranged in to linear array and form a smooth fiber array output end face in the fiber clamp, and place an end in the resonant cavity box, the other end of resonant cavity box is provided with a planoconvex spotlight, the convex surface plating anti-reflection film of this planoconvex spotlight, and plane plating semitransparent reflecting film and outside this resonant cavity box, described fiber array output end face is D to the distance of semitransparent reflecting film, distance between the fibre core of described fiber array output end face is d, the focal length of described planoconvex spotlight is F, and then D and d should satisfy the following relationship formula: $d^2=\frac{\mathrm{\&lambda;}}{2}F$ With $D=\frac{F}{2}.$

The inner cladding cross-sectional profile of described doubly clad optical fiber is closed shape of double-H groove weld or rectangle, or square.

Described pump laser is a semiconductor laser diode.

Laser array by the output of fiber-optic output face, come and go through resonant cavity and just in time to finish one time Fourier transform when a week arriving the fiber-optic output face once more, realized the mutual coupling of each optical-fiber laser, export relevant synthetic laser by planoconvex spotlight plane semitransparent reflecting film at last, thereby realize the beam combination of light laser beam.Light path of the present utility model is very simple, and optical element significantly reduces, need not be in addition with independent spatial filter, and can be used for the beam combination of a large amount of fiber laser beams, produce high power laser light.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Description of drawings

Fig. 1 is used for the optical fiber laser group beam laser structural representation for the utility model.

Fig. 2 is fiber-optic output face figure in the utility model.

Fig. 3 is the planoconvex spotlight profile.

Embodiment

See also Fig. 1 earlier, Fig. 1 is used for the optical fiber laser group beam laser structural representation for the utility model.As seen from the figure, the utility model optical fiber laser group beam laser, its formation comprises many doubly clad optical fibers 2, one end of every doubly clad optical fiber 2 connects a pump laser 1, after it is characterized in that the other end 21 removal surrounding layers of described many doubly clad optical fibers 2, closely be arranged in to linear array and form a smooth fiber array output end face 22 in the fiber clamp 3 and place ends in the resonant cavity box 5, the other end of resonant cavity box 5 is provided with a planoconvex spotlight 4, the convex surface plating anti-reflection film 41 of this planoconvex spotlight 4, and plane plating semitransparent reflecting film 42 is outside this resonant cavity box 5, form resonant cavity between the semitransparent reflecting film 42 of described fiber array output end face 22 and planoconvex spotlight 4, described fiber array output end face 22 is D to the distance of semitransparent reflecting film 42, distance between the fibre core 24 of described fiber array output end face 22 is d, the focal length of described planoconvex spotlight 4 is F, and then D and d satisfy the following relationship formula: $d^2=\frac{\mathrm{\&lambda;}}{2}F$ With $D=\frac{F}{2}.$

Inner cladding 23 cross-sectional profile of the doubly clad optical fiber 2 described in the present embodiment are the closed shapes of double-H groove weld, and as shown in Figure 2, described pump laser (1) is a semiconductor laser diode.

Its course of work is as follows: send pump light by semiconductor laser 1 and enter doubly clad optical fiber 2, the laser that produces in doped core 24 is through 22 outputs of fiber-optic output face, the array laser of output projects planoconvex spotlight 4, become feedback by semitransparent reflecting film 42 reflections then, behind planoconvex spotlight 4, arrive fiber-optic output face 22 once more and just in time finish Fourier transform one time, realize the relevant coupling of laser in the different fiber, thereby the output of whole system just can obtain relevant output.

Be a specific embodiment below:

With three semiconductor lasers and three doubly clad optical fibers, its length is 25m, constitutes fiber laser.The laser center wavelength that these three fiber lasers produce is 1080nm trickle fluctuation about 10nm, so we are designed to 1080nm with whole system operation optical maser wavelength, fiber clamp is long to be 2cm, so we remove the surrounding layer of three doubly clad optical fiber front end 2cm length, the closed shape of the double-H groove weld of doubly clad optical fiber inner cladding cross section, distance between two parallel lines is 350 μ m, fibre core is in the inner cladding middle, diameter 10 μ m, fix after fiber clamp 3 linear arrays are closely arranged well according to shown in Figure 2 three optical fiber are put into, the distance that adjacent fibre core is 24 is 350 μ m, and the end of three optical fiber polishes and all is in a plane, and this plane is exactly a fiber-optic output face 22.According to formula $d^2=\frac{\mathrm{\&lambda;}}{2}F,$ We have designed at operation wavelength is the planoconvex spotlight of 1080nm, focal length F=22.685cm, the long D=11.3425cm in chamber, on the convex surface of planoconvex spotlight, plate the anti-reflection film of coupling λ=1080nm then, plating is at the semitransparent reflecting film of λ=1080nm on the plane of planoconvex spotlight, and its transmitance is 40%.Fiber-optic output 22 and planoconvex spotlight are pressed adjusting light path shown in Figure 1, make the distance D=11.3425cm of light output end face 22 to the planoconvex spotlight plane, the central optical axis of middle fibre core 24 of fiber-optic output and planoconvex spotlight point-blank simultaneously.When whole system is worked like this, can output wavelength be the coherent laser of 1080nm just.

In sum, the utility model has constituted a resonant cavity by the output 22 that the parallel tight arrangement of doubly clad optical fiber 2 front ends of having removed surrounding layer is formed with planoconvex spotlight 4, make by the array laser of fiber-optic output 22 outputs and just finished Fourier transform one time, realized relevant coupling through the resonant cavity round trip.Avoided independent usage space filter in the utility model, used optics is few, thereby light path has simply improved the stability of system.

In sum, the utlity model has simple in structurely, the coherent beam combination of multifiber laser is convenient in the system stability practicality, the characteristics of the relevant output of high power laser light.

Claims (3)

1. optical fiber laser group beam laser, comprise many doubly clad optical fibers (2), one end of every doubly clad optical fiber (2) connects a pump laser (1), after it is characterized in that the other end (21) the removal surrounding layer of described many doubly clad optical fibers (2), closely be arranged in to linear array and form a smooth fiber array output end face (22) in the fiber clamp (3), and place an end in the resonant cavity box (5), the other end of resonant cavity box (5) is provided with a planoconvex spotlight (4), the convex surface plating anti-reflection film (41) of this planoconvex spotlight (4), and plane plating semitransparent reflecting film (42) is outside this resonant cavity box (5), described fiber array output end face (22) is D to the distance of semitransparent reflecting film (42), distance between the fibre core (24) of described fiber array output end face (22) is d, the focal length of described planoconvex spotlight (4) is F, and then D and d satisfy the following relationship formula: $d^2=\frac{\mathrm{\&lambda;}}{2}F$ With $D=\frac{F}{2}.$

2. optical fiber laser group beam laser according to claim 1, inner cladding (23) cross-sectional profile that it is characterized in that described doubly clad optical fiber (2) are closed shape of double-H groove weld or rectangle, or square.

3. optical fiber laser group beam laser according to claim 1 is characterized in that described pump laser (1) is a semiconductor laser diode.

Images