CN101110511A - All optical annular impulse laser of all solid photon gapped gain optical fiber - Google Patents
All optical annular impulse laser of all solid photon gapped gain optical fiber Download PDFInfo
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- CN101110511A CN101110511A CNA2007100592625A CN200710059262A CN101110511A CN 101110511 A CN101110511 A CN 101110511A CN A2007100592625 A CNA2007100592625 A CN A2007100592625A CN 200710059262 A CN200710059262 A CN 200710059262A CN 101110511 A CN101110511 A CN 101110511A
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Abstract
The present invention discloses a full fiber annular pulsing laser for a full solid state photon band gap gain fiber, which comprises a fiber coupling LD pumping with wavelength of 980nm and an annular cavity. Wherein, the annular cavity is composed of a full solid state photon band gap gain fiber, a single mode fiber respectively welded at two ends of the gain fiber, of which one end is directly connected with a mode locking output unit and the other end is connected with a single mode fiber integration unit with a variable length through a wavelength division multiplex coupler for the pumping. Optical pulse traveling route of the annular full fiber laser is specified in sequence below: from the full solid state photon band gap gain fiber and the single mode for drawing out to the single mode fiber integration unit with a variable length and then to the mode locking output unit. The laser is characterized by small size, strong stability, simple operation and lower production cost, realize switching amongst three pulse operating states as a convenient seed source of fiber amplifiers of various types.
Description
Technical field
The present invention relates to a kind of full fiber annular pulse laser of all solid state photon band gap gain fibre, belong to laser technology field.
Background technology
Photonic crystal fiber (PCF) progress: 1996, Russell group of Bath university successfully developed first photonic crystal fiber (PCF) in the world.1999, several laboratories of Britain, the U.S., Denmark and company utilized the traditional fiber drawing technology to develop the PCF of multiple different structure in succession; At present domestic University On The Mountain Of Swallows, Wuhan flames of war arranged also, longly fly the development work that unit such as group has carried out PCF.Since 2000, be that the non-linear research of PCF of representative worldwide forms focus to produce the super continuum light spectrum, research contents relates to design, manufacturing, transmission characteristic, nonlinear characteristic and the various possible application thereof of PCF.After this, several in the world research groups begin to attempt utilizing the experiment of PCF as gain media or dispersion compensation media implementation femtosecond laser oscillator and amplifier.From 2005, German Limpert group successively reported and has utilized the PCF that mixes ytterbium to realize that as gain media the laser of high power femtosecond amplifies running [1].From then on begun the new application focus of research PCF femto-second laser.
The fiber laser progress: at the beginning of the nineties in last century, having begun with the traditional fiber is the fiber laser of gain media, mainly is that pulse energy is lower with the form running [2] of orphan's transmission.Theoretical at present and experimental study has all proved can exist three kinds of pulse drive manners, particularly self similarity operation mode can realize higher pulse power in the fiber laser and accumulate better linearity and has warbled, has been convenient to compress the narrower pulse of acquisition [3,4].Advantages such as PCF ends single mode with the nothing of its big core diameter, and chromatic dispersion is controlled have become the host material of the gain medium of a new generation.The third generation full fiber type femto-second laser that with PCF is representative at present mainly adopts straight chamber type and ring cavity type structure [5,6], particularly the ring cavity all optical fibre structure has cheap cost, can resist the enclosed construction of external environment influence, need not the integrated of loaded down with trivial details debugging and high-power and high-lighting beam quality or the like advantage [7].Therefore, its important unique effect that can not replace of performance in basic subject, new and high technology, national defense applications and big science engineering.
At present the structure based on the full optical fiber ring laser of PCF generally is divided into three parts: gain fibre+monomode fiber, dispersion compensating fiber and polarization rotation lock form unit [2,6,8,9].Unidirectionally be: from dispersion compensating fiber, monomode fiber, gain fibre, export to polarization rotation lock form unit around order.
List of references
[1]J.Limpert，F.?Roser，T.Schreiber，A.Tunnermann，“High-power?ultrafast?fiber?lasersystems”，IEEE?J.Sel.Top.Quantum?Electron.12(2006)：233-244.
[2]K.Tamura，E.P.?Ippen，H.A.Haus，L.E.Nelson，“77-fs?pulse?generation?from?a?stretched-pulsemode-locked?all-fiber?ring?laser”，Opt.Lett.，18(1993)：1080-1082.
[3]A.Chong，J.Buckley，W.Renninger，F.Wise，“All-normal?dispersion?femtosecond?fiber?laser”，Opt.Expr.，.14(2006)：10095-10100.
[4]F..Ilday，J.R.Buckley，W.G.Clark，F.W.Wise，“Self-similar?evolution?of?parabolic?pulses?in?laser”，Phys.Rev.Lett.，92(2004)213902.
[5]J.Limpert，T.?Schreiber，S.Nolte，H.Zellmer，A.Tunnermann，“All?fiber?chirped-pulseamplification?system?based?on?compression?in?air-guiding?photonic?bandgap?fiber”，Opt.Expr.，.11(2003)：3332-3337.
[6]H.Lim，F.Wise，“Control?of?dispersion?in?a?femtosecond?ytterbium?laser?by?use?ofhollow-core?photonic?bandgap?fiber”，Opt.Expr.，.12(2004)：2231-2235.
[7]J.Takayanagi，N.Nishizawa，H.Nagai，M.Yoshida，T.Goto，“Generation?of?high-powerfemtosecond?pulse?and?octave-spanning?ultrabroad?supercontinuum?using?all-fiber?system”，IEEE?Photon?Technol.Lett.，17(2005)：37-39.
[8]V.P.Kalosha，L.Chen，X.Bao，“Ultra-short?pulse?operation?of?all-optical?fiber?passivelymode-locked?ytterbium?laser”，Opt.Expr.，.14(2006)：4935-4945.
[9]Y.?Logvin，V.P.Kalosha，H.Anis，“Third-order?dispersion?impact?on?mode-locking?regimes?ofYb-doped?fiber?laser?with?photonic?bandgap?fiber?for?dispersion?compensation”，Opt.Expr.，.15(2007)：985-991.
Summary of the invention
The present invention is intended to propose a kind of full fiber annular pulse laser of all solid state photon band gap gain fibre.This laser has that volume is little, high, easy and simple to handle, the cost of stability is hanged down characteristics, can be operated between three kinds of pulse operating conditions and switch, easily as the seed source of dissimilar fiber amplifiers.
The present invention is realized by the following technical programs, a kind of full fiber annular pulse laser of all solid state photon band gap gain fibre, its pumping source is a laser diode, adopting optical fiber coupling output light wavelength is 980nm, it is characterized in that, the annular chamber of this laser comprises: all solid state photon band gap gain fibre 7, the two ends of all solid state photon band gap gain fibre 7 are welded respectively and are drawn monomode fiber 2, wherein the monomode fiber 2 of drawing of an end directly links to each other with locked mode output unit 5, and the monomode fiber 2 of drawing of an other end links to each other with elongated degree monomode fiber integrated unit 6 with wave division multiplex coupler 4 through pumping, the other end of elongated degree monomode fiber integrated unit 6 links to each other with locked mode output unit 5, and the light pulse operation route of the loop pulse full-optical-fiber laser that is constituted is: by all solid state photon band gap gain fibre and draw the monomode fiber → elongated degree monomode fiber integrated unit → locked mode output unit of usefulness.
Above-mentioned all solid state photon band gap gain fibre 7, its support and core district are quartz material, and ytterbium (Yb) is mixed in the core district, and core diameter is the 4-10 micron, and core diameter is 1.458 at the effective refractive index of 1 micron waveband; Bore dia in cladding regions is 2.5 microns, and pitch-row is 6.25 microns, and for filling the quartz material of doped semiconductor material germanium (Ge), the effect refractive index of clad region is 1.487 in the hole, and this all solid state photon band gap gain fibre is negative dispersion at 1 micron waveband.The length of this gain fibre is 0.1-1 rice.
Above-mentioned elongated degree monomode fiber integrated unit 6, for being encapsulated in the monomode fiber structure of three different lengths in the interconnecting device, the length of three monomode fibers respectively by the 1-2 of the length of all solid state photon band gap gain fibre doubly, 4-5 doubly and 7-8 extraordinarily with after determining, deduct respectively again and draw the used total length value in monomode fiber unit (2).
Startup locked mode and stable mode-locking unit that above-mentioned locked mode output unit 5 combines with semiconductor saturable absorbing mirror (SESAM) for the nonlinear polarization circulator (NPE) of optical fiber coupled mode.
The invention has the advantages that: (1) gain media adopts the AS-PBGF of ginseng ytterbium, and this optical fiber can provide gain and negative dispersion simultaneously at 1 micron waveband.Compare with original technology, just reduced other negative dispersion compensation fiber unit (see figure 1), thereby it is long to have shortened laser chamber, has improved repetition rate; (2) AS-PBGF is all solid state, and core diameter can be made and the core diameter of traditional SMF coupling, can connect easily and has reduced insertion loss greatly.This has just overcome the shortcoming that existing PCF gain fibre can't effectively be connected with SMF.(3) fiber unit (positive dispersion is provided) that adopts integrated different length SMF to constitute carries out chamber internal dispersion control, can adjust the operating condition of laser easily, make this laser can be operated in " traditional orphan's type " (keeping clean negative dispersion in the chamber), " dispersion management type " (keeping a small amount of clean positive dispersion in the chamber) and " gain management orphan type " (keeping in the chamber) three kinds of operating conditions respectively than the Islam Ghusl positive dispersion.Thereby the different seed pulses with a laser just go for dissimilar fiber amplifiers, have obviously increased the function and application scope of such laser; (4) taking burst transmissions order by all solid state photon band gap gain fibre → elongated degree monomode fiber integrated unit → locked mode (output) unit, is to export from the dispersion compensation end.This compares with the reverse order (see figure 1) of former technology can obtain shorter pulse.
Description of drawings
Fig. 1 is the device connection diagram of existing full optical fiber ring laser.
Fig. 2 is the device connection diagram of full optical fiber ring laser of the present invention.
Among the figure: 1 is common gain fibre unit; 2 for drawing the monomode fiber unit; 3 is the dispersion compensating fiber unit; 4 are the pumping wave division multiplex coupler; 5 locked mode output units; 6 is elongated degree monomode fiber integrated unit; 7 is all solid state photon band gap gain fibre unit; Arrow is represented the light pulse operation route of laser.
Fig. 3 is 6 a structural representation among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are illustrated.
Fig. 2 is the device connection diagram of full optical fiber ring laser of the present invention.Wherein all solid state photon band gap gain fibre 7, its support and core district are quartz material, ytterbium (Yb) is mixed in the core district, core diameter is the 4-10 micron, core diameter is 1.458 at the effective refractive index of 1 micron waveband, bore dia in cladding regions is 2.5 microns, pitch-row is 6.25 microns, it in the hole quartz material of filling doped semiconductor material germanium (Ge), the effect refractive index of clad region is 1.487, operation wavelength is negative dispersion at 1 micron waveband, and its length is chosen relevant with doping content, and it is 0.4m that present embodiment is chosen length.The length of drawing monomode fiber unit 2 of present embodiment is drawn the total length sum of used monomode fiber for each element, and the selection principle of this unit optical fiber is " short as far as possible ", and length can be chosen for 0.5m; The monomode fiber of three different lengths in the elongated like this degree monomode fiber integrated unit 6 is taken as respectively according to laser " traditional orphan's type ", " dispersion management type " and " gain management orphan type " three kinds of drive manners and is 0.26m, 1.42m and 2.5m.And be encapsulated in the interconnecting device according to the length order, switch respectively in ring laser by optical fiber coupling plug connector again, thereby in a fiber laser, realize the switching between three kinds of pulse conditions; It is the laser diode of the optical fiber coupling output of 980nm that pumping source adopts wavelength; Above-mentioned pumping coupler 4 is the WDM fiber coupler of 940-980nm/1030-1050nm; Above-mentioned locked mode (output) unit 5 adopts the combining form of nonlinear polarization circulator (NPE) and SESAM.Wherein NPE and SASAM adopt the optical fiber coupled mode, and utilize the reflection end of the polarization beam splitting device among the NPE to insert SASAM, at transmission output laser; Select the rotation direction of the isolator among the NPE to be: from gain fibre, elongated degree monomode fiber integrated unit, to the unidirectional sequence mode of mode locking unit output.
Claims (4)
1. the full fiber annular pulse laser of an all solid state photon band gap gain fibre, its pumping source is a laser diode, adopting optical fiber coupling output light wavelength is 980nm, it is characterized in that, the annular chamber of this laser comprises: all solid state photon band gap gain fibre (7), the two ends of all solid state photon band gap gain fibre (7) are welded respectively and are drawn monomode fiber (2), wherein the monomode fiber (2) of drawing of an end directly links to each other with locked mode output unit (5), and the monomode fiber (2) of drawing of an other end links to each other with elongated degree monomode fiber integrated unit (6) with wave division multiplex coupler (4) through pumping, the other end of elongated degree monomode fiber integrated unit (6) links to each other with locked mode output unit (5), and the light pulse operation route of the loop pulse full-optical-fiber laser that is constituted is: by all solid state photon band gap gain fibre and draw the monomode fiber → elongated degree monomode fiber integrated unit → locked mode output unit of usefulness.
2. press the full fiber annular pulse laser of the described all solid state photon band gap gain fibre of claim 1, it is characterized in that, all solid state photon band gap gain fibre, its support and core district are quartz material, ytterbium is mixed in the core district, core diameter is the 4-10 micron, core diameter is 1.458 at the effective refractive index of 1 micron waveband, bore dia in cladding regions is 2.5 microns, pitch-row is 6.25 microns, and for filling the quartz material of doped semiconductor material germanium, the effect refractive index of clad region is 1.487 in the hole, this all solid state photon band gap gain fibre is negative dispersion at 1 micron waveband, and the length of this gain fibre is 0.1-1 rice.
3. press the full fiber annular pulse laser of the described all solid state photon band gap gain fibre of claim 1, it is characterized in that, elongated degree monomode fiber integrated unit (6), for being encapsulated in the monomode fiber structure of three different lengths in the interconnecting device, the length of three monomode fibers respectively by the 1-2 of the length of all solid state photon band gap gain fibre doubly, 4-5 doubly and 7-8 extraordinarily with after determining, deduct respectively again and draw the used total length value in monomode fiber unit (2).
4. press the full fiber annular pulse laser of the described all solid state photon band gap gain fibre of claim 1, it is characterized in that startup locked mode and stable mode-locking unit that locked mode output unit (5) combines with semiconductor saturable absorbing mirror for the nonlinear polarization circulator of optical fiber coupled mode.
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| CNB2007100592625A CN100490261C (en) | 2007-08-24 | 2007-08-24 | All optical annular impulse laser of all solid photon band gap gain optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364370A (en) * | 2013-07-03 | 2013-10-23 | 哈尔滨工程大学 | Annular core optical fiber sensor based on annular chamber decline |
| CN111755939A (en) * | 2020-06-27 | 2020-10-09 | 复旦大学 | Super-continuum spectrum generation device and super-continuum spectrum generation method |
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2007
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364370A (en) * | 2013-07-03 | 2013-10-23 | 哈尔滨工程大学 | Annular core optical fiber sensor based on annular chamber decline |
| CN103364370B (en) * | 2013-07-03 | 2015-06-17 | 哈尔滨工程大学 | Annular core optical fiber sensor based on annular chamber decline |
| CN111755939A (en) * | 2020-06-27 | 2020-10-09 | 复旦大学 | Super-continuum spectrum generation device and super-continuum spectrum generation method |
| CN111755939B (en) * | 2020-06-27 | 2022-10-18 | 复旦大学 | Super-continuum spectrum generation device and super-continuum spectrum generation method |
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