CN103186009A - Femtosecond pulse signal-to-noise ratio improving device and method based on optical fiber Sagnac ring - Google Patents
Femtosecond pulse signal-to-noise ratio improving device and method based on optical fiber Sagnac ring Download PDFInfo
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- CN103186009A CN103186009A CN201110445400XA CN201110445400A CN103186009A CN 103186009 A CN103186009 A CN 103186009A CN 201110445400X A CN201110445400X A CN 201110445400XA CN 201110445400 A CN201110445400 A CN 201110445400A CN 103186009 A CN103186009 A CN 103186009A
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Abstract
本发明涉及基于光纤萨格奈克环的飞秒脉冲信噪比提升装置及方法，包括耦合器(1)和偏振控制器(2)，所述耦合器(1)的第一输入端(11)连接有输入光纤(12)，所述耦合器(1)的第二输入端(41)连接有输出光纤(42)，所述耦合器(1)的第一输出端(21)连接有第一光纤(23)，所述耦合器(1)的第二输出端(31)连接有第二光纤(33)，所述第一光纤(23)、第二光纤(33)以及耦合器(1)围成封闭环，所述偏振控制器(2)设置在封闭环上。本发明解决了超短超强脉冲激光系统中的信噪比问题，本发明具有原理简单，结构紧凑，调试方便。
The invention relates to a femtosecond pulse signal-to-noise ratio improvement device and method based on an optical fiber Sagnac ring, comprising a coupler (1) and a polarization controller (2), the first input end (11) of the coupler (1) ) is connected with an input optical fiber (12), the second input end (41) of the coupler (1) is connected with an output optical fiber (42), and the first output end (21) of the coupler (1) is connected with the first An optical fiber (23), the second output end (31) of the coupler (1) is connected with a second optical fiber (33), the first optical fiber (23), the second optical fiber (33) and the coupler (1 ) form a closed ring, and the polarization controller (2) is arranged on the closed ring. The invention solves the problem of signal-to-noise ratio in the ultra-short and ultra-intense pulse laser system, and the invention has the advantages of simple principle, compact structure and convenient debugging.
Description
Technical field
The present invention relates to femtosecond pulse signal to noise ratio (S/N ratio) lifting gear and method based on the optical fiber Sagnac loop.
Background technology
In recent years, along with the appearance of optical parameter chirped pulse amplification (OPCPA) and constantly development, the research of ultrashort superpower pulsed laser technique has realized great-leap-forward development, U.S. Lao Lunsilifo More laboratory (LLNL), laser engineering research institute of Osaka, Japan university (ILE), Britain Rutherford experiment chamber (RAL), Mel laboratory (Limeil) etc. all is coupled this technology and the high power solid state laser that is used for laser fusion in the France, formed the ultrashort superpower pulsed solid stale laser of a brand-new generation, the pulse width that obtains is generally tens of femtoseconds～hundreds of femtoseconds, output power is higher than 100TW mostly, even surpass 1PW, focus on power density up to 10
19～10
22W/cm
2Such power density has been created extreme physical condition such as unprecedented highfield, high-intensity magnetic field, High Voltage and high-temperature in the laboratory, for the research in many fields such as high field physics and high-energy-density physics provides strong tool, exploring new phenomenon, new rule and possible application for scientists provides the gordian technique basis and has supported.Simultaneously, the cross discipline that many and ultra-intense laser merge mutually and the field, forward position that enjoys scientific circles to pay close attention to have been opened in the development of ultrashort superpower pulsed laser technique, accelerate, produce laser plasma, produce neutron, produce higher hamonic wave, Ah second's physics, astrophysics etc. as ICF fast ignition, high-energy physics, high strength x-ray irradiation source, particle, brought some novel physical phenomenons of not expected to scientists.Yet, increase along with ultrashort superpower pulse peak power, the requirement of high field Physical Experiment paired pulses signal to noise ratio (S/N ratio) is also more and more higher, especially when ultrashort superpower pulse laser is used for the research field relevant with matter interaction, its gordian technique difficult problem is exactly the existence of the not high and prepulsing of signal to noise ratio (S/N ratio).Signal to noise ratio (S/N ratio) refers to the ratio of laser main pulse peak strength and prepulsing peak strength or amplified spont-aneous emission intensity, has become one of most important parameter of high power laser system, 10
12～10
15The signal to noise ratio (S/N ratio) of magnitude has also become the important indicator of ultra high power large scale laser instrument (clap watt and Chinese mugwort watt device etc.).
At present, the signal to noise ratio (S/N ratio) of general ultrashort ultra-intense laser system is all 10
6～10
8Magnitude, thus the intensity that makes amplified spont-aneous emission or prepulsing is up to 10
14W/cm
2, surpassed the ionization threshold (10 of most of materials
10-10
11W/cm
2), spontaneous radiation and prepulsing have just changed original experiment condition (as producing plasma, destroying object etc.) before main pulse arrives like this, thereby influence process and change mechanism of action are to the analysis generation significant impact of experimental result and physical phenomenon.The signal to noise ratio (S/N ratio) problem of ultrashort superpower pulse laser system is not well solved now, become the bottleneck of development such as the high field physical study field that restricts the ICF fast ignition, affecting the bulking property design of ultrashort ultra-intense laser system, is that one of key core technology that breaks through is badly in need of in ultrashort ultra-intense laser system.Therefore, explore brand-new signal to noise ratio (S/N ratio) lifting new method and new technology and just seem particularly important.
Summary of the invention
In order to solve the signal to noise ratio (S/N ratio) problem in the ultrashort superpower pulse laser system, the invention provides a kind of the ring based on optical fiber Sagnac and improve femtosecond affectionately towards the device and method of signal to noise ratio (S/N ratio), the principle of the invention is simple, compact conformation, debugging is convenient.
Technical solution of the present invention is:
Femtosecond pulse signal to noise ratio (S/N ratio) lifting gear based on the optical fiber Sagnac loop, its special character is: comprise coupling mechanism 1 and Polarization Controller 2, the first input end 11 of described coupling mechanism 1 is connected with input optical fibre 12, second input end 41 of described coupling mechanism 1 is connected with output optical fibre 42, first output terminal 21 of described coupling mechanism 1 is connected with first optical fiber 23, second output terminal 31 of described coupling mechanism 1 is connected with second optical fiber 33, described first optical fiber 23, second optical fiber 33 and coupling mechanism 1 surround closed-loop, and described Polarization Controller 2 is arranged on the closed-loop.
Above-mentioned Polarization Controller 2 is arranged on the middle of first optical fiber and second optical fiber.
Device carries out femtosecond pulse signal to noise ratio (S/N ratio) method for improving, and its special character is: may further comprise the steps:
1] femtosecond pulse enters coupling mechanism by input optical fibre;
2] femtosecond pulse is through being divided into first via light 22 and the second road light of propagating in opposite direction 32 behind the coupling mechanism: described first via light is exported from first output terminal, and along first Optical Fiber Transmission, enter coupling mechanism around one week of closed-loop by second output terminal through Polarization Controller, second optical fiber; The second road light is exported from second output terminal simultaneously, and along second Optical Fiber Transmission, enters coupling mechanism around one week of closed-loop by first output terminal through Polarization Controller, first optical fiber;
3] first via light and the second road light interfere in coupling mechanism and from the second input end output optical pulse of coupling mechanism, and propagate along output optical fibre.
Advantage of the present invention is:
1, the present invention adopts optical fiber Sagnac ring lifting femtosecond pulse signal to noise ratio (S/N ratio) to reach 4 magnitudes.
2, energy loss is little: the present invention can realize high conversion efficiency by control nonlinear phase shift and polarization.
3, beam quality preferably: the present invention adopts all optical fibre structure, makes output light have beam quality preferably.
4, output pulse time domain waveform is good, and the pulse waveform of output optical pulse of the present invention and input is similar, undistorted.
5, simple in structure, convenient and practical, cost is low, optical device in optical fiber, coupling mechanism and the Polarization Controller etc. three that the whole device of the present invention adopts, and buying is easily installed easily.
Description of drawings
Fig. 1 is theory diagram of the present invention;
Fig. 2 is structural representation of the present invention;
Fig. 3 is input and output femtosecond pulse oscillogram of the present invention;
Fig. 4 is of the present invention through the output femtosecond pulse signal to noise ratio (S/N ratio) figure behind the optical fiber Sagnac ring (Sagnac loop).
Embodiment
Referring to Fig. 1, the invention provides the schematic diagram based on the signal to noise ratio (S/N ratio) Hoisting System of grating Sagnac ring.Femtosecond pulse is injected in the signal to noise ratio (S/N ratio) lifting gear that encircles based on Sagnac, after the lifting signal to noise ratio (S/N ratio), is injected into the signal to noise ratio (S/N ratio) of measuring the output pulse in the signal-to-noise ratio measuring instrument (Sequoia 1000).
Referring to Fig. 2, the nonlinear optics switch that the invention provides based on optical fiber Sagnac ring promotes femtosecond pulse signal to noise ratio (S/N ratio) lifting gear, comprise coupling mechanism 1 and Polarization Controller 2, the first input end 11 of coupling mechanism 1 is connected with input optical fibre 12, second input end 41 of coupling mechanism 1 is connected with output optical fibre 42, first output terminal 21 of coupling mechanism 1 is connected with first optical fiber 23, second output terminal 31 of coupling mechanism 1 is connected with second optical fiber 33, described first optical fiber 23, second optical fiber 33 and coupling mechanism 1 surround closed-loop, Polarization Controller 2 is arranged on the closed-loop, general in order to make the equivalent optical path of two-way light, Polarization Controller 2 is arranged on the middle of first optical fiber and second optical fiber, the just joint of first optical fiber and second light.
A kind of nonlinear optics switch based on optical fiber Sagnac ring of principle promotes the technology of femtosecond pulse signal to noise ratio (S/N ratio), adopt optical fiber as nonlinear medium, when propagating, the femtosecond pulse of laser instrument output produces nonlinear phase shift in optical fiber, size by control polarization and nonlinear phase shift, stop the low-intensity composition (prepulsing and noise) in the pulse, make composition stronger in the pulse by (main pulse)
Input signal light is divided into two-beam first via light 22 and the first via light of propagating in opposite direction 32 through coupling mechanism, in closed-loop, propagate respectively after a week through identical transmission range, by their polarization of Polarization Controller control, in fiber coupler, interfere, finally by the second input end output optical pulse (transmitted light) of coupling mechanism, the nonlinear refraction rate coefficient that generally adopts optical fiber is 2 * 10
-19m
2/ W, length is 24m.
Referring to Fig. 3, be the output waveform figure after encircling through optical fiber Sagnac, the pulsewidth of input optical pulse is 500fs, and output pulse waveform is gaussian shaped profile still, and pulsewidth is about 310fs.
Referring to Fig. 4, through the signal to noise ratio (S/N ratio) of optical fiber Sagnac ring back output femtosecond pulse.Utilize optical fiber Sagnac ring to promote the signal to noise ratio (S/N ratio) of femtosecond pulse, adopt normalized logarithmic coordinate to represent the state of signal-to-noise of input pulse and output pulse, the main pulse width is 500fs, and prepulsing is at the 2.5ps place of main pulse front, and the signal to noise ratio (S/N ratio) of input pulse is 10
-2, through the intensity of optical fiber Sagnac ring back prepulsing by original 10
-2Drop to 10
-6, the intensity of prepulsing has reduced by 4 orders of magnitude.Therefore, adopt based on optical fiber Sagnac ring and the signal to noise ratio (S/N ratio) of femtosecond pulse can be promoted 4 orders of magnitude.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5694114A (en) * | 1992-09-04 | 1997-12-02 | Mcdonnell Douglas Corporation | Coherent alarm for a secure communication system |
| US6897434B1 (en) * | 2002-02-28 | 2005-05-24 | Northwestern University | All-fiber photon-pair source for quantum communications |
| CN1846159A (en) * | 2003-09-02 | 2006-10-11 | 普林斯顿大学理事会 | Semiconductor Optical Amplifier-Based All-Optical Wavelength Converter with Sagnac Interferometer in Asymmetric Position |
| CN101398590A (en) * | 2008-11-06 | 2009-04-01 | 天津大学 | All-optical frequency entangled photon source |
| CN101551490A (en) * | 2009-04-30 | 2009-10-07 | 天津理工大学 | Sagnac interferometer type comb filter with channel spacing unrelated with operating wavelength |
-
2011
- 2011-12-27 CN CN201110445400XA patent/CN103186009A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5694114A (en) * | 1992-09-04 | 1997-12-02 | Mcdonnell Douglas Corporation | Coherent alarm for a secure communication system |
| US6897434B1 (en) * | 2002-02-28 | 2005-05-24 | Northwestern University | All-fiber photon-pair source for quantum communications |
| CN1846159A (en) * | 2003-09-02 | 2006-10-11 | 普林斯顿大学理事会 | Semiconductor Optical Amplifier-Based All-Optical Wavelength Converter with Sagnac Interferometer in Asymmetric Position |
| CN101398590A (en) * | 2008-11-06 | 2009-04-01 | 天津大学 | All-optical frequency entangled photon source |
| CN101551490A (en) * | 2009-04-30 | 2009-10-07 | 天津理工大学 | Sagnac interferometer type comb filter with channel spacing unrelated with operating wavelength |
Non-Patent Citations (1)
| Title |
|---|
| 王静等: "基于高双折射Sagnac 环的可调环形腔掺铒光纤激光器理论与实验研究", 《物理学报》, vol. 58, no. 11, 30 November 2009 (2009-11-30) * |
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Application publication date: 20130703 |