CN104009377A - Blue-light and ultraviolet-light enhancing super-continuum spectrum laser device of full-fiber structure - Google Patents
Blue-light and ultraviolet-light enhancing super-continuum spectrum laser device of full-fiber structure Download PDFInfo
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Abstract
The invention provides a blue-light and ultraviolet-light enhancing super-continuum spectrum laser device of a full-fiber structure, and belongs to the fields of the laser technology and the non-linear optics. The blue-light and ultraviolet-light enhancing super-continuum spectrum laser device specifically comprises a pumping source, a fiber amplifier and a tapered quartz photonic crystal fiber, wherein the pumping source, the fiber amplifier and the tapered quartz photonic crystal fiber are sequentially connected. The pumping source is a non-linear polarization rotary mode-locked laser device body of the full-fiber structure. The fiber amplifier comprises a single-mode fiber amplifier body and double-clad fiber amplifier bodies. Meanwhile, a quartz photonic crystal fiber is tapered through a fiber drawing tower or a fiber tapering machine to increase blue light contents and ultraviolet light contents in a super-continuum spectrum. The super-continuum spectrum generated through the blue-light and ultraviolet-light enhancing super-continuum spectrum laser device has the advantages of being high in blue light content and ultraviolet light content, good in spectrum flatness, large in spectrum bandwidth and high in coupling efficiency and conversion efficiency.
Description
Technical field
The invention belongs to laser technology, non-linear optical field, the blue light and the ultraviolet light that are specifically related to a kind of all optical fibre structure strengthen super continuous spectrums laser.
Background technology
When the light pulse of high-peak power is propagated in highly nonlinear optical fiber, the evolution of its time domain and frequency domain is not only subject to the impact of optical fiber dispersion characteristic, also be subject to the impact of fiber nonlinear effect, for example, the nonlinear effects such as spontaneous phase-modulation (SPM), Cross-phase Modulation (XPM), stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS) and four wave mixing (FWM), all these dispersions and non-linear process cause spectral bandwidth to launch hundreds if not thousands of nanometers jointly, and this phenomenon is called the generation of super continuum light spectrum.
Super continuum source is because its band broadness, good stability, repetition rate determine these features by pump light source, makes that it is estimated in optical coherence imaging, frequency, optical instrument test, optic fiber gyroscope, ultrashort pulse generation and material spectrum, environment measurement, Fibre Optical Sensor, light metrology, laser spectroscopy, biomedicine and optical sampling etc. much have important using value in fields.Wherein, the super continuous laser of blue light and ultraviolet light has inestimable value in fields such as laser display, biological spectrum imaging, electrooptical countermeasuress especially.
Summary of the invention
The object of the present invention is to provide a kind of blue light and ultraviolet light of all optical fibre structure to strengthen super continuous spectrums laser, it is high that its generation super has in spectral component blue light and ultraviolet light composition continuously, spectrum flatness is good, and band is broad, coupling efficiency height and the high feature of conversion efficiency.
For achieving the above object, the technical scheme that the present invention takes is that a kind of blue light of all optical fibre structure and ultraviolet light strengthen super continuous spectrums laser, and this laser comprises the pumping source (1), the fiber amplifier (2) that are connected by optical fiber, draws cone quartzy photonic crystal fiber (3).
Described pumping source (1) is the nonlinear polarization rotation mode locked fiber laser of all optical fiber ring cavity structure, and pumping source (1) comprises single mode semiconductor laser a (4), optical fibre wavelength division multiplexer a (5), single doped cladding layer rare earth doped fiber a (6), delay fine (7), optical fiber filter (8), Polarization Controller a (9), the relevant isolator (10) of polarization, Polarization Controller b (11), fiber coupler (12), fibre optic isolater a (13); The tail optical fiber of described single mode semiconductor laser a (4) is connected with the first input end of optical fibre wavelength division multiplexer a (5); The output of optical fibre wavelength division multiplexer a (5) is connected with single doped cladding layer rare earth doped fiber a (6), and the other end of single doped cladding layer rare earth doped fiber a (6) is connected with delay fine (7); The other end that postpones fine (7) is connected with the input of optical fiber filter (8), and the output of optical fiber filter (8) is connected with Polarization Controller a (9); The input of the other end isolator relevant to polarization (10) of Polarization Controller a (9) connects, the be correlated with output of isolator (10) of polarization is connected with Polarization Controller b (11), the other end of Polarization Controller b (11) is connected with the input of fiber coupler (12), the first output of fiber coupler (12) is connected with the second input of optical fibre wavelength division multiplexer a (5), looping laser cavity structure.The second output of described fiber coupler (12) is connected with the input of fibre optic isolater a (13), and the output of fibre optic isolater a (13) is signal laser delivery outlet.The pump light of single mode semiconductor laser a (4) output is coupled into laser cavity by optical fibre wavelength division multiplexer a (5), pumping list doped cladding layer rare earth doped fiber a (6) obtains flashlight, two Polarization Controller a (9) Polarization Controller b (11) isolators relevant with polarization (10) have formed the locked mode element of nonlinear polarization rotation can realize passive mode locking, postpone fine (7) and play the effect that increases chamber long reduction repetition, like this, the flashlight that pumping source (1) obtains has low repetition, narrow pulsewidth, the characteristic that the content of warbling is large, after amplifying, fiber amplifier can obtain the Laser output of high-peak power.
Described fiber amplifier (2) comprises first order monomode fiber amplifier, second level double-cladding fiber amplifier and the third level double-cladding fiber amplifier setting gradually; Described first order monomode fiber amplifier comprises single mode semiconductor laser b (14), optical fibre wavelength division multiplexer b (15), single doped cladding layer rare earth doped fiber (16), fibre optic isolater b (17); Wherein, the output of single mode semiconductor laser b (14) is connected with the first input end of optical fibre wavelength division multiplexer b (15), the signal laser of fibre optic isolater a (13) output is connected with the second input of optical fibre wavelength division multiplexer b (15), the output of optical fibre wavelength division multiplexer b (15) is connected with single doped cladding layer rare earth doped fiber b (16), and the other end of single doped cladding layer rare earth doped fiber b (16) is connected with the input of fibre optic isolater b (17).
Described second level double-cladding fiber amplifier comprises multiple die semiconductor laser a (18), optical-fiber bundling device a (19), double clad rare earth doped fiber b (20), fibre optic isolater c (21); Wherein, the output of multiple die semiconductor laser a (18) is connected with the pumping input of optical-fiber bundling device a (19), the laser output of the fibre optic isolater b (17) of first order monomode fiber amplifier is connected with the signal input part of optical-fiber bundling device a (19), the output of optical-fiber bundling device a (19) is connected with double clad rare earth doped fiber a (20), and the other end of double clad rare earth doped fiber a (20) is connected with the input of fibre optic isolater c (21).
Described third level double-cladding fiber amplifier comprises multiple die semiconductor laser b (22), optical-fiber bundling device b (23), double clad rare earth doped fiber b (24), fibre optic isolater d (25); The output that it is characterized in that multiple die semiconductor laser b (22) is connected with the pumping input of optical-fiber bundling device b (23), the laser output of the fibre optic isolater c (21) of second level double-cladding fiber amplifier is connected with the signal input part of optical-fiber bundling device b (23), the output of optical-fiber bundling device b (23) is connected with double clad rare earth doped fiber b (24), and the other end of double clad rare earth doped fiber b (24) is connected with the input of fibre optic isolater d (25).
The described quartzy photonic crystal fiber of cone (3) that draws is used fiber drawing tower directly to draw cone or use optical fiber to draw cone machine to adopt airport expansion post-tensioning cone technology to draw cone to quartzy photonic crystal fiber to quartzy photonic crystal fiber.
The course of work of fiber amplifier (2) is as follows, seed light is after fibre optic isolater a (13), under single mode semiconductor laser b (14) pumping by optical fibre wavelength division multiplexer b (15) coupling, after first order monomode fiber amplifier, through fibre optic isolater b (17) output, the seed light obtaining is exaggerated; Laser after the first order is amplified enters second level double-cladding fiber amplifier, and under multiple die semiconductor laser a (18) pumping through optical-fiber bundling device a (19) coupling, through fibre optic isolater c (21) output, laser is further amplified; Finally, laser after amplify the second level enters third level double-cladding fiber amplifier, under multiple die semiconductor laser b (22) pumping through optical-fiber bundling device b (23) coupling, through fibre optic isolater d (25) output, the power of laser is further amplified.
To the tail optical fiber of fibre optic isolater d (25), draw cone to process and reduce its mode field diameter, quartzy photonic crystal fiber is increased to its mode field diameter by the technical finesse of collapsing of selectivity airport, make like this mould field of fibre optic isolater d (25) tail optical fiber reach and mate with quartzy photonic crystal fiber mould field as far as possible.
Processing is bored to by using fiber drawing tower directly to draw in the middle part of quartzy photonic crystal fiber, or use optical fiber to draw cone machine to adopt airport expansion post-tensioning cone technology to draw cone to process, obtaining core diameter is approximately 2～3 μ m, hole pitch of holes (Λ) is 1.5～3.5 μ m, filling rate (d/ Λ) is 0.5～0.95, and quartzy photonic crystal fiber (3) is bored in drawing that zero-dispersion wavelength hypsochromic shift is moving.
The laser of fiber amplifier (2) output is through the above-mentioned super continuous spectrums that draws generation after the quartzy photonic crystal fiber of cone (3), realized blue light in spectral component and the effect of ultraviolet light composition enhancing.
Compared with prior art, beneficial effect of the present invention is: pumping source has adopted long chamber nonlinear polarization rotation mode locked fiber laser, its repetition rate that produces flashlight can be by postponing fine length adjustment, and pulse duration is picosecond magnitude, after monomode fiber amplifier and two-stage double-cladding fiber amplifier, can obtain the Laser output that peak power is higher, be entered into and draw in the quartzy photonic crystal fiber of cone, be easy to produce the super continuous spectrums of blue light and ultraviolet light enhancing.
Accompanying drawing explanation
Fig. 1 is the blue light of all optical fibre structure of the present invention and the structural representation that ultraviolet light strengthens super continuous spectrums laser.
In figure: 1-pumping source, 2-fiber amplifier, 3-draw and bore quartzy photonic crystal fiber, 4-single mode semiconductor laser a, 5-optical fibre wavelength division multiplexer a, 6-mono-doped cladding layer rare earth doped fiber a, 7-postpone fine, 8-optical fiber filter, 9-Polarization Controller a, 10-polarization isolator of being correlated with, 11-Polarization Controller b, 12-fiber coupler, 13-fibre optic isolater a, 14-single mode semiconductor laser b, 15-optical fibre wavelength division multiplexer b, 16-mono-doped cladding layer rare earth doped fiber b, 17-fibre optic isolater b, 18-multiple die semiconductor laser a, 19-optical-fiber bundling device a, 20-double clad rare earth doped fiber a, 21-fibre optic isolater c, 22-multiple die semiconductor laser b, 23-optical-fiber bundling device b, 24-double clad rare earth doped fiber b, 25-fibre optic isolater d.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail.
As shown in Figure 1, the blue light of a kind of all optical fibre structure of the present invention and ultraviolet light strengthen super continuous spectrums laser, comprise pumping source (1), the fiber amplifier (2) connecting successively and draw cone quartzy photonic crystal fiber (3).Wherein, the nonlinear polarization rotation mode locked fiber laser that pumping source (1) is all optical fibre structure; This pumping source adopts ring cavity structure, comprises single mode semiconductor laser a (4), optical fibre wavelength division multiplexer a (5), single doped cladding layer rare earth gain fibre a (6), delay fine (7), the optical fiber filter (8), Polarization Controller a (9), polarization relevant isolator (10), Polarization Controller b (11) and the fiber coupler (12) that by monomode fiber, are connected.Delay fine (7) in this example is the SMF-28 optical fiber of length 1000m.During work, by pulling Polarization Controller (PC) (9) (11), realize single longitudinal mode locking, the repetition rate of the seed light obtaining is 200kHz, and pulse duration is about 250ps, and output average power is about 200 μ W.
Fiber amplifier has three grades, comprises the first order monomode fiber amplifier, second level double-cladding fiber amplifier and the third level double-cladding fiber amplifier that connect successively.Wherein, the rare earth doped fiber b (16) that first order monomode fiber amplifier adopts is the Yb dosed optical fiber of single covering 6/125 μ m, the 250dB/m that is absorbed as at 975nm place; The double clad rare earth doped fiber a (20) that second level double-cladding fiber amplifier adopts is double clad 7/128 μ m Yb dosed optical fiber, the 5.4dB/m that is absorbed as at 975nm place; The double clad rare earth doped fiber b (24) that third level double-cladding fiber amplifier adopts is double clad 10/128 μ m Yb dosed optical fiber, the 6.8dB/m that is absorbed as at 975nm place.
The fiber amplifier course of work is: seed light is after fibre optic isolater a (13), under 600mW/976nm single mode semiconductor laser b (14) pumping by optical fibre wavelength division multiplexer b (15) coupling, after first order monomode fiber amplifier, through fibre optic isolater b (17) output seed light, be amplified to about 20mW; Laser after the first order is amplified enters second level double-cladding fiber amplifier, under multiple die semiconductor laser a (18) pumping of the 10W/975nm through optical-fiber bundling device a (19) coupling, through fibre optic isolater c (21) output, laser is further amplified to 1W; Finally, laser after amplify the second level enters third level double-cladding fiber amplifier, under multiple die semiconductor laser b (22) pumping of 2 25W/975nm through optical-fiber bundling device b (23) coupling, through fibre optic isolater d (25) output, the power of laser is amplified to 20W.
To the tail optical fiber of fibre optic isolater d (25), draw cone to process and reduce its mode field diameter, quartzy photonic crystal fiber is increased to its mode field diameter by the technical finesse of collapsing of selectivity airport, make like this mould field of fibre optic isolater d (25) tail optical fiber reach and mate with quartzy photonic crystal fiber mould field as far as possible, splice loss, splice attenuation should be less than 0.8dB.Processing is bored to by using fiber drawing tower directly to draw in the middle part of quartzy photonic crystal fiber, or use optical fiber to draw cone machine to adopt airport expansion post-tensioning cone technology to draw cone to process, obtaining core diameter is approximately 2～3 μ m, hole pitch of holes (Λ) is 1.5～3.5 μ m, filling rate (d/ Λ) is 0.5～0.95, and quartzy photonic crystal fiber (3) is bored in drawing that zero-dispersion wavelength hypsochromic shift is moving.The laser of fiber amplifier (2) output can reach 13W through the above-mentioned super continuous spectrums laser power producing after cone photonic crystal fiber (3) of drawing, output spectrum bandwidth is about 370～2400nm, and has realized the effect that blue light in the super continuous spectrums producing and ultraviolet light composition strengthen.
Claims (2)
1. the blue light of all optical fibre structure and ultraviolet light strengthen a super continuous spectrums laser, it is characterized in that: this laser comprises the pumping source (1), the fiber amplifier (2) that are connected by optical fiber, draws cone quartzy photonic crystal fiber (3);
Described pumping source (1) is the nonlinear polarization rotation mode locked fiber laser of all optical fiber ring cavity structure, and pumping source (1) comprises single mode semiconductor laser a (4), optical fibre wavelength division multiplexer a (5), single doped cladding layer rare earth doped fiber a (6), delay fine (7), optical fiber filter (8), Polarization Controller a (9), the relevant isolator (10) of polarization, Polarization Controller b (11), fiber coupler (12), fibre optic isolater a (13), the tail optical fiber of described single mode semiconductor laser a (4) is connected with the first input end of optical fibre wavelength division multiplexer a (5), the output of optical fibre wavelength division multiplexer a (5) is connected with single doped cladding layer rare earth doped fiber a (6), and the other end of single doped cladding layer rare earth doped fiber a (6) is connected with delay fine (7), the other end that postpones fine (7) is connected with the input of optical fiber filter (8), and the output of optical fiber filter (8) is connected with Polarization Controller a (9), the input of the other end isolator relevant to polarization (10) of Polarization Controller a (9) connects, the be correlated with output of isolator (10) of polarization is connected with Polarization Controller b (11), the other end of Polarization Controller b (11) is connected with the input of fiber coupler (12), the first output of fiber coupler (12) is connected with the second input of optical fibre wavelength division multiplexer a (5), looping laser cavity structure, the second output of described fiber coupler (12) is connected with the input of fibre optic isolater a (13), and the output of fibre optic isolater a (13) is signal laser delivery outlet, the pump light of single mode semiconductor laser a (4) output is coupled into laser cavity by optical fibre wavelength division multiplexer a (5), pumping list doped cladding layer rare earth doped fiber a (6) obtains flashlight, two Polarization Controller a (9) Polarization Controller b (11) isolators relevant with polarization (10) have formed the locked mode element of nonlinear polarization rotation can realize passive mode locking, postpone fine (7) and play the effect that increases chamber long reduction repetition, like this, the flashlight that pumping source (1) obtains has low repetition, narrow pulsewidth, the characteristic that the content of warbling is large, after amplifying, fiber amplifier can obtain the Laser output of high-peak power,
Described fiber amplifier (2) comprises first order monomode fiber amplifier, second level double-cladding fiber amplifier and the third level double-cladding fiber amplifier setting gradually; Described first order monomode fiber amplifier comprises single mode semiconductor laser b (14), optical fibre wavelength division multiplexer b (15), single doped cladding layer rare earth doped fiber (16), fibre optic isolater b (17); Wherein, the output of single mode semiconductor laser b (14) is connected with the first input end of optical fibre wavelength division multiplexer b (15), the signal laser of fibre optic isolater a (13) output is connected with the second input of optical fibre wavelength division multiplexer b (15), the output of optical fibre wavelength division multiplexer b (15) is connected with single doped cladding layer rare earth doped fiber b (16), and the other end of single doped cladding layer rare earth doped fiber b (16) is connected with the input of fibre optic isolater b (17);
Described second level double-cladding fiber amplifier comprises multiple die semiconductor laser a (18), optical-fiber bundling device a (19), double clad rare earth doped fiber b (20), fibre optic isolater c (21); Wherein, the output of multiple die semiconductor laser a (18) is connected with the pumping input of optical-fiber bundling device a (19), the laser output of the fibre optic isolater b (17) of first order monomode fiber amplifier is connected with the signal input part of optical-fiber bundling device a (19), the output of optical-fiber bundling device a (19) is connected with double clad rare earth doped fiber a (20), and the other end of double clad rare earth doped fiber a (20) is connected with the input of fibre optic isolater c (21);
Described third level double-cladding fiber amplifier comprises multiple die semiconductor laser b (22), optical-fiber bundling device b (23), double clad rare earth doped fiber b (24), fibre optic isolater d (25); The output that it is characterized in that multiple die semiconductor laser b (22) is connected with the pumping input of optical-fiber bundling device b (23), the laser output of the fibre optic isolater c (21) of second level double-cladding fiber amplifier is connected with the signal input part of optical-fiber bundling device b (23), the output of optical-fiber bundling device b (23) is connected with double clad rare earth doped fiber b (24), and the other end of double clad rare earth doped fiber b (24) is connected with the input of fibre optic isolater d (25);
The described quartzy photonic crystal fiber of cone (3) that draws is used fiber drawing tower directly to draw cone or use optical fiber to draw cone machine to adopt airport expansion post-tensioning cone technology to draw cone to quartzy photonic crystal fiber to quartzy photonic crystal fiber.
2. the blue light of a kind of all optical fibre structure according to claim 1 and ultraviolet light strengthen super continuous spectrums laser, it is characterized in that: the course of work of fiber amplifier (2) is as follows, seed light is after fibre optic isolater a (13), under single mode semiconductor laser b (14) pumping by optical fibre wavelength division multiplexer b (15) coupling, after first order monomode fiber amplifier, through fibre optic isolater b (17) output, the seed light obtaining is exaggerated; Laser after the first order is amplified enters second level double-cladding fiber amplifier, and under multiple die semiconductor laser a (18) pumping through optical-fiber bundling device a (19) coupling, through fibre optic isolater c (21) output, laser is further amplified; Finally, laser after amplify the second level enters third level double-cladding fiber amplifier, under multiple die semiconductor laser b (22) pumping through optical-fiber bundling device b (23) coupling, through fibre optic isolater d (25) output, the power of laser is further amplified;
To the tail optical fiber of fibre optic isolater d (25), draw cone to process and reduce its mode field diameter, quartzy photonic crystal fiber is increased to its mode field diameter by the technical finesse of collapsing of selectivity airport, make like this mould field of fibre optic isolater d (25) tail optical fiber reach and mate with quartzy photonic crystal fiber mould field as far as possible;
Processing is bored to by using fiber drawing tower directly to draw in the middle part of quartzy photonic crystal fiber, or use optical fiber to draw cone machine to adopt airport expansion post-tensioning cone technology to draw cone to process, obtaining core diameter is approximately 2～3 μ m, hole pitch of holes (Λ) is 1.5～3.5 μ m, filling rate (d/ Λ) is 0.5～0.95, and quartzy photonic crystal fiber (3) is bored in drawing that zero-dispersion wavelength hypsochromic shift is moving;
The laser of fiber amplifier (2) output is through the above-mentioned super continuous spectrums that draws generation after the quartzy photonic crystal fiber of cone (3), realized blue light in spectral component and the effect of ultraviolet light composition enhancing.
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| CN107069397A (en) * | 2017-01-12 | 2017-08-18 | 北京工业大学 | A kind of resonator super continuum source output device |
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