CN101938080B - Active optical fiber with characteristics of single-mode output TM01 mode - Google Patents

Active optical fiber with characteristics of single-mode output TM01 mode Download PDF

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Publication number
CN101938080B
CN101938080B CN2010102186261A CN201010218626A CN101938080B CN 101938080 B CN101938080 B CN 101938080B CN 2010102186261 A CN2010102186261 A CN 2010102186261A CN 201010218626 A CN201010218626 A CN 201010218626A CN 101938080 B CN101938080 B CN 101938080B
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rare
doping
fibre core
earth ions
optical fiber
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CN101938080A (en
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王春灿
温晓东
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Beijing Jiaotong University
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Beijing Jiaotong University
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Abstract

The invention discloses an active optical fiber with the characteristics of single-mode output TM01 mode and relates to the active optical fiber. The active optical fiber comprises a rare earth-doped ion fiber core (1) and a cladding (4). A non-rare earth-doped ion annular fiber core (2) is arranged between the rare earth-doped ion fiber core (1) and the cladding (4). Axisymmetrically distributed rectangular air holes (3) or a circular air hole array (5) are/is introduced into the non-rare earth-doped ion annular fiber core (2) along the radius direction, the included angle between the adjacent air holes is 360/m degrees, m is larger than 12 and smaller than 30, and the m is an integer. The active optical fiber can solve the problems of requiring to simplify the structure of an optical fiber laser system with the single-mode output TM01 mode and improving the working stability. Finally, the TM01 mode in the optical fiber laser can occupy the dominant position in the mode competition. The utilization of the active optical fiber can obtain output signal light with high radial polarization purity and does not need to additionally introduce a mode selection device in a resonant cavity.

Description

A kind ofly have single mode output TM＜sub〉01＜/sub〉Active Optical Fiber of mode characteristic
Technical field
The present invention relates to a kind of single mode output TM that has 01The Active Optical Fiber of mode characteristic.
Background technology
Radial polarisation laser is different from linearly polarized light and circularly polarized light, and its direction of an electric field radially distributes, and electric field intensity all has axial symmetry with a width of cloth.Radial polarisation laser is compared with line (circle) polarization, lens focus by high-NA can obtain littler hot spot, therefore can be used as the micro-light source of super-resolution, it is in Metal Cutting efficiently in addition, and electronics quickens and field such as biological light tweezer also has important use value.The laser that obtains the output of radial polarisation pattern mainly is divided into solid-state laser, gaseous state laser and fiber laser.It is little that compare solid-state and gaseous state laser, fiber laser have a volume, and therefore good heat dissipation and beam quality advantages of higher utilize fiber laser outputting radial polarization mode to become in recent years research focus.Utilize fiber laser outputting radial polarization mode at present, i.e. TM 01The method of pattern is mainly as follows:
One, in the fiber laser resonant cavity, introduces a Brewster double cone prism, have only the TM of radial polarisation according to Brewster 01Loss minimum during pattern process prism, other patterns are launched because of the polarized component with vertical incidence face, thereby cause bigger loss, and final fiber laser obtains single mode output TM 01The characteristic of pattern.
Two, fiber amplifier utilizes active polarization maintaining optical fibre as gain media, and linear polarization seed signal light injects active polarization maintaining optical fibre with appropriate angle, thereby encourages LP to greatest extent 11Pattern and suppress LP 01Pattern is exerted pressure to active polarization maintaining optical fibre simultaneously, and its direction and main shaft are 45 degree angles, by accurately regulating the LP that pressure size and angle make two cross-polarizations 11The pattern same-phase synthesizes TM 01Pattern.
More than two kinds of methods deficiency is respectively arranged, thereby the former need introduce the delivery efficiency that discrete optical element has reduced laser in laserresonator, the latter then needs to utilize aid accurately to adjust the incident angle of seed light source, and the size and Orientation that puts on active polarization maintaining optical fibre upward pressure, these had both increased the complexity of system, also brought the factors of instability to laser simultaneously.
Summary of the invention
Technical problem to be solved by this invention: require to simplify single mode output TM 01Mode light fibre laser system configuration, the problem of raising job stability proposes a kind of single mode output TM that has 01The Active Optical Fiber of mode characteristic.
Technical scheme of the present invention:
A kind of have a single mode output TM 01The Active Optical Fiber of mode characteristic, this Active Optical Fiber comprises: doping with rare-earth ions fibre core and covering; Non-doping with rare-earth ions annular fibre core is set between doping with rare-earth ions fibre core and the covering.
Introduce the airport that axial symmetry distributes along radial direction in non-doping with rare-earth ions annular fibre core, the angle that faces mutually between the airport is the 360/m degree, 12＜m＜30, and m is an integer.
The airport that distributes along radial direction introducing axial symmetry in non-doping with rare-earth ions annular fibre core is rectangular opening or array of circular holes.
Useful result of the present invention:
A kind of single mode output TM that has provided by the invention 01The Active Optical Fiber of mode characteristic is by introducing the non-doped core of ring-type between doping with rare-earth ions fibre core and covering, and introduces rectangle airport or the array of circular holes that axial symmetry distributes, and obtaining radially birefringence, thereby causes TM 01The limitation loss of pattern is far smaller than TE 01Pattern and HE 21Pattern finally makes TM in the fiber laser 01Pattern is dominate in mode competition.Utilization has single mode output TM 01The Active Optical Fiber of mode characteristic can obtain the output signal light of high radial polarization purity, does not need additionally to introduce in resonant cavity the modeling device, thereby has simplified single mode output TM 01The system configuration of mode light fibre laser has improved job stability.
Description of drawings
Fig. 1 rectangle airport angle is the single mode output TM of 30 degree 01The Active Optical Fiber structural representation of pattern;
Fig. 2 rectangle airport angle is the single mode output TM of 20 degree 01The Active Optical Fiber structural representation of pattern;
Fig. 3 rectangle airport angle is the single mode output TM of 12 degree 01The Active Optical Fiber structural representation of pattern;
The circular airport array of Fig. 4 angle is the single mode output TM of 30 degree 01The Active Optical Fiber structural representation of pattern;
Drawing reference numeral: 1-doping with rare-earth ions fibre core, the non-doping with rare-earth ions annular of 2-fibre core, 3-rectangle airport, 4-covering, the circular airport array of 5-.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
A kind of have a single mode output TM 01The Active Optical Fiber of mode characteristic, this Active Optical Fiber comprises: doping with rare-earth ions fibre core 1 and covering 4.Non-doping with rare-earth ions annular fibre core 2 is set between doping with rare-earth ions fibre core 1 and the covering 4.
Introduce rectangle airport 3 or the circular airport array 5 that axial symmetry distributes along radial direction in described non-doping with rare-earth ions annular fibre core 2, the angle that faces mutually between the airport is the 360/m degree, 12＜m＜30, and m is an integer.
Described doping with rare-earth ions fibre core 1, the refractive index of non-doping with rare-earth ions annular fibre core 2 and covering 4 is expressed as n respectively 1, n 2And n 4
Embodiment one
A kind of have a single mode output TM 01The Active Optical Fiber of mode characteristic, as shown in Figure 1, by doping with rare-earth ions fibre core 1, non-doping with rare-earth ions annular fibre core 2 and covering 4 are formed.
The diameter of doping with rare-earth ions fibre core 1: 8 μ m, refractive index n 1=1.4573.
Rare earth ion in the doping with rare-earth ions fibre core 1 is distributed as: middle radius is that the border circular areas middle rare earth ion concentration of 2.35 μ m is 0, and all the other regional rare earth ion concentrations are 1.8 * 10 26m -3
The external diameter of non-doping with rare-earth ions ring-type fibre core 2=20 μ m, the airport that distributes along radial direction introducing axial symmetry in non-doping with rare-earth ions annular fibre core 2 is a rectangle airport 3, the size of rectangle airport 3 is wide and long to be respectively: 0.1 μ m and 6 μ m, the angle of adjacent rectangle airport 3 is 360/12 degree=30 degree, the refractive index n of rectangle airport 3 3=1; The refractive index n of non-doping with rare-earth ions annular fibre core 2 2=1.449.
The refractive index n of covering 4 4=1.4508.
Embodiment two
Embodiment two, as shown in Figure 2, distinguish with embodiment one:
The refractive index n of doping with rare-earth ions fibre core 1 1=1.464.
The external diameter of non-doping with rare-earth ions ring-type fibre core 2=20 μ m, the airport that distributes along radial direction introducing axial symmetry in non-doping with rare-earth ions annular fibre core 2 is a rectangle airport 3, the angle of adjacent rectangle airport 3 is 360/18 degree=20 degree, the refractive index n of rectangle airport 3 3=1; The refractive index n of non-doping with rare-earth ions annular fibre core 2 2=1.46.
The refractive index n of covering 4 4=1.4573.
Embodiment three
Embodiment three, as shown in Figure 3, distinguish with embodiment one:
The refractive index n of doping with rare-earth ions fibre core 1 1=1.4415.
The external diameter of non-doping with rare-earth ions ring-type fibre core 2=16 μ m, the refractive index n of non-doping with rare-earth ions ring-type fibre core 2 2=1.421.
The airport that distributes along radial direction introducing axial symmetry in non-doping with rare-earth ions annular fibre core 2 is a rectangle airport 3, the size of rectangle airport 3 is wide and long to be respectively: 0.1 μ m and 4 μ m, the angle of adjacent rectangle airport 3 is 360/30 degree=12 degree, the refractive index n of rectangle airport 3 3=1.
The refractive index n of covering 4 4=1.43385.
Embodiment four
Embodiment four, as shown in Figure 4, distinguish with embodiment one:
The refractive index n of doping with rare-earth ions fibre core 1 1=1.4573.
The external diameter of non-doping with rare-earth ions ring-type fibre core 2: 20 μ m, the airport that distributes along radial direction introducing axial symmetry in the non-doping with rare-earth ions annular fibre core 2 is circular airport array 5, circular airport diameter is 0.1 micron, wide and long being respectively of size of circular airport array 5: 0.1 μ m and 6 μ m, the angle that faces mutually between the circular airport array 5 is 360/12 degree=30 degree, 30 degree, the refractive index of circular airport=1.
The refractive index n of non-doping with rare-earth ions ring-type fibre core 2 2=1.4515.
The refractive index n of covering 4 4=1.451.
Has single mode output TM 01The design procedure of the Active Optical Fiber parameter of mode characteristic:
1. set the basic parameter of Active Optical Fiber, i.e. the diameter of doping with rare-earth ions fibre core 1 and refractive index; The external diameter of non-doping with rare-earth ions ring-type fibre core 2 and the size of rectangle airport, the angle of adjacent vacant pore; Cladding index.
2. set to adjust the refractive index of non-doping with rare-earth ions ring-type fibre core 2, make TM 01The limitation loss of pattern is far smaller than TE 01Pattern and HE 21Pattern.
3. the rare earth ion of optimizing in the doping with rare-earth ions fibre core 1 distributes, and makes TM 01With basic mode HE 11The mould field distribution and the integrated value of gain regions reach minimum and maximum value respectively, thereby cause TM 01Pattern is dominate in the mode competition of fiber laser.

Claims (2)

1. one kind has single mode output TM 01The Active Optical Fiber of mode characteristic, this Active Optical Fiber comprises: doping with rare-earth ions fibre core (1) and covering (4); It is characterized in that: non-doping with rare-earth ions annular fibre core (2) is set between doping with rare-earth ions fibre core (1) and the covering (4);
Wherein the diameter of doping with rare-earth ions fibre core (1) is 8 μ m, its refractive index n 1=1.4573, the rare earth ion in this doping with rare-earth ions fibre core (1) is distributed as: middle radius is that the border circular areas middle rare earth ion concentration of 2.35 μ m is 0, and all the other regional rare earth ion concentrations are 1.8 * 10 26m -3
The external diameter of non-doping with rare-earth ions ring-type fibre core (2) is 20 μ m, in non-doping with rare-earth ions annular fibre core (2), introduce the rectangle airport (3) that axial symmetry distributes along radial direction, the size of rectangle airport (3) is wide and long to be respectively: 0.1 μ m and 6 μ m, the angle of adjacent two rectangle airports (3) are 30 degree; The refractive index n of rectangle airport (3) 3=1; The refractive index n of non-doping with rare-earth ions annular fibre core (2) 2=1.449;
The refractive index n of covering (4) 4=1.4508.
2. one kind has single mode output TM 01The Active Optical Fiber of mode characteristic, this Active Optical Fiber comprises: doping with rare-earth ions fibre core (1) and covering (4); It is characterized in that: non-doping with rare-earth ions annular fibre core (2) is set between doping with rare-earth ions fibre core (1) and the covering (4);
Wherein the diameter of doping with rare-earth ions fibre core (1) is 8 μ m, its refractive index n 1=1.4573, the rare earth ion in this doping with rare-earth ions fibre core (1) is distributed as: middle radius is that the border circular areas middle rare earth ion concentration of 2.35 μ m is 0, and all the other regional rare earth ion concentrations are 1.8 * 10 26m -3
The external diameter of non-doping with rare-earth ions ring-type fibre core (2) is 20 μ m, in non-doping with rare-earth ions annular fibre core (2), introduce the circular airport array (5) that axial symmetry distributes along radial direction, wherein circular airport diameter is 0.1 micron, the size of this circle airport array (5) is wide and long to be respectively: 0.1 μ m and 6 μ m, the angle of adjacent two circular airport arrays (5) is 30 degree, the refractive index n of circular airport 3Be 1; The refractive index n of non-doping with rare-earth ions annular fibre core (2) 2=1.4515;
The refractive index n of covering (4) 4=1.451.
CN2010102186261A 2010-06-25 2010-06-25 Active optical fiber with characteristics of single-mode output TM01 mode Expired - Fee Related CN101938080B (en)

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CN104868350B (en) * 2014-02-25 2018-03-30 福州高意通讯有限公司 A kind of superpower laser
PL226041B1 (en) 2015-03-25 2017-06-30 Inst Tech Materiałów Elektronicznych Photonic optical waveguide for transmitting radially polarized light beam and method for manufacturing such an optical waveguide
CN108333673A (en) * 2018-01-04 2018-07-27 南京邮电大学 A kind of heterogeneous fragmented packets layer large mould field single mode optical fiber
CN113178769B (en) * 2021-04-29 2022-11-22 上海大学 High-order mode wide-spectrum light source based on ring core active optical fiber

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FR2822242B1 (en) * 2001-03-16 2003-08-15 Cit Alcatel PHOTONIC FIBER WITH HIGH EFFECTIVE SURFACE
US7403689B2 (en) * 2003-11-19 2008-07-22 Corning Incorporated Active photonic band-gap optical fiber
US7304719B2 (en) * 2004-03-31 2007-12-04 Asml Holding N.V. Patterned grid element polarizer
JP4561314B2 (en) * 2004-10-28 2010-10-13 日立電線株式会社 Optical fiber for fiber laser, fiber laser, and laser oscillation method
CN1971323A (en) * 2006-12-13 2007-05-30 中国科学院上海光学精密机械研究所 Large mode field double-cladding single-mode optical fiber
US20090052476A1 (en) * 2007-08-07 2009-02-26 Hitachi Cable, Ltd. Optical fiber for an optical fiber laser, method for fabricating the same, and optical fiber laser
CN101710194A (en) * 2009-12-18 2010-05-19 北京交通大学 Multilayer rare earth doped ion ring core fiber and manufacture method thereof

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