CN105762624A - Mid-infrared super-continuous spectrum light source capable of achieving flat wide spectrum - Google Patents

Mid-infrared super-continuous spectrum light source capable of achieving flat wide spectrum Download PDF

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CN105762624A
CN105762624A CN201610308103.3A CN201610308103A CN105762624A CN 105762624 A CN105762624 A CN 105762624A CN 201610308103 A CN201610308103 A CN 201610308103A CN 105762624 A CN105762624 A CN 105762624A
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light source
doped fiber
bundling device
mid
fiber
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万雄
刘鹏希
章婷婷
舒嵘
王建宇
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Shanghai Institute of Technical Physics of CAS
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06708Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06716Fibre compositions or doping with active elements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06754Fibre amplifiers
    • H01S3/06758Tandem amplifiers
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09Processes or apparatus for excitation, e.g. pumping
    • H01S3/091Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/102Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
    • H01S3/1022Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
    • H01S3/1024Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
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Abstract

本发明公开了一种宽谱平坦的中红外超连续谱光源,包括:1550nm可调谐纳秒脉冲光源、975nm连续光源、793nm连续光源、1550nm光隔离器、1550/975nm波分复用器、合束器、掺铒光纤、铒镱共掺光纤、铥钬共掺光纤、掺铥光纤、氟化物光纤组成,并将之依次序连接。本发明优点在于通过调节输入脉冲的幅度、频率、包络使输出光谱平坦。

The invention discloses a wide-spectrum and flat mid-infrared supercontinuum light source, comprising: 1550nm tunable nanosecond pulse light source, 975nm continuous light source, 793nm continuous light source, 1550nm optical isolator, 1550/975nm wavelength division multiplexer, combined Beamer, erbium-doped fiber, erbium-ytterbium co-doped fiber, thulium-holmium co-doped fiber, thulium-doped fiber, fluoride fiber, and connected in sequence. The advantage of the invention is that the output spectrum is made flat by adjusting the amplitude, frequency and envelope of the input pulse.

Description

一种宽谱平坦的中红外超连续谱光源A wide-spectrum flat mid-infrared supercontinuum light source

技术领域technical field

本发明涉及激光光电子领域,特别是一种宽谱平坦的中红外超连续谱光源。The invention relates to the field of laser optoelectronics, in particular to a wide-spectrum flat mid-infrared supercontinuum light source.

背景技术Background technique

光学领域中,当泵浦激光穿过特殊光波导时,一系列的非线性效应引起入射激光束的光谱展宽,输出的宽光谱激光束称超连续谱激光。近年来,各种新型超连续谱激光源的技术发展使之成为了一个光学研究的热点领域并且不断在新的领域中得到了广泛的应用。目前,超连续激光源已经运用于荧光显微成像、流式细胞仪、荧光寿命成像显微、荧光共振能量转移、光学相干层析、非接触检测、共焦显微生物医学分析、宽谱光探测与激光雷达、光通信,气体传感等领域。研制宽谱平坦的中红外超连续谱光源,符合科研及工业生产的发展需求。In the field of optics, when the pump laser passes through a special optical waveguide, a series of nonlinear effects cause the spectrum broadening of the incident laser beam, and the output broad-spectrum laser beam is called supercontinuum laser. In recent years, the technical development of various new supercontinuum laser sources has made it a hot field of optical research and has been widely used in new fields. At present, supercontinuum laser sources have been used in fluorescence microscopy, flow cytometry, fluorescence lifetime imaging microscopy, fluorescence resonance energy transfer, optical coherence tomography, non-contact detection, confocal microbiological medical analysis, and broad-spectrum light detection. And laser radar, optical communication, gas sensing and other fields. The development of a wide-spectrum flat mid-infrared supercontinuum light source meets the development needs of scientific research and industrial production.

目前的超连续谱光源主要分为两类:一类采用全光纤结构实现,另一类使用电调谐方法实现。前者使用全光纤脉冲激光器作为泵浦光源,后者使用电脉冲激励激光二极管发出脉冲激光。二者的区别在于全光纤结构更利于实现小型化,但是在光脉冲的稳定性和可调节性上弱于电脉冲方式。The current supercontinuum light source is mainly divided into two categories: one is realized by all-fiber structure, and the other is realized by electric tuning method. The former uses an all-fiber pulsed laser as a pumping light source, and the latter uses an electrical pulse to excite a laser diode to emit pulsed laser light. The difference between the two is that the all-fiber structure is more conducive to miniaturization, but the stability and adjustability of the optical pulse are weaker than the electric pulse method.

通常获得超连续谱的方法是,使用高重频的纳秒或亚纳秒窄脉冲,泵浦一段单模光纤,产生较窄的超连续光谱,在使用掺铒光纤放大器和掺铥光纤放大器进行放大,再去泵浦氟化物、硫化物或碲化物光纤,产生超连续谱。The usual way to obtain the supercontinuum is to use high repetition frequency nanosecond or subnanosecond narrow pulses to pump a section of single-mode fiber to generate a narrower supercontinuum, which is performed by using erbium-doped fiber amplifiers and thulium-doped fiber amplifiers. Amplify and then pump fluoride, sulfide or telluride fibers to generate a supercontinuum.

发明内容Contents of the invention

为了获得更平坦的超连续谱光源,本发明对上述方法做出改进,提出了一种宽谱平坦的中红外超连续谱光源,通过调整激励脉冲的频率、幅度、形状等参数,可以调整输出的超连续谱的展宽范围、平均功率和平坦性。In order to obtain a flatter supercontinuum light source, the present invention improves the above method, and proposes a wide-spectrum flat mid-infrared supercontinuum light source. By adjusting parameters such as the frequency, amplitude, and shape of the excitation pulse, the output can be adjusted. The broadening range, average power and flatness of the supercontinuum.

本发明的技术解决方案如下:Technical solution of the present invention is as follows:

一种宽谱平坦的中红外超连续谱光源包括1550nm可调谐纳秒脉冲光源1、975nm连续光源一11、975nm连续光源二12、793nm连续光源13、1550nm光隔离器2、1550/975nm波分复用器3、第一合束器5、第二合束器8、掺铒光纤4、铒镱共掺光纤6、铥钬共掺光纤7、掺铥光纤9、氟化物光纤10,其中:A wide-spectrum flat mid-infrared supercontinuum light source includes 1550nm tunable nanosecond pulse light source 1, 975nm continuous light source 11, 975nm continuous light source 2 12, 793nm continuous light source 13, 1550nm optical isolator 2, 1550/975nm wavelength division Multiplexer 3, first beam combiner 5, second beam combiner 8, erbium-doped optical fiber 4, erbium-ytterbium co-doped optical fiber 6, thulium-holmium co-doped optical fiber 7, thulium-doped optical fiber 9, fluoride optical fiber 10, wherein:

所述的1550nm可调谐脉冲光源1与1550nm光隔离器2相连,1550nm光隔离器2和975nm连续光源一11分别连接1550/975nm波分复用器3的两个输入端,其输出连接掺铒光纤4,掺铒光纤4和975nm连续光源二12分别连接第一合束器5的两个输入端,第一合束器5的输出端连接铒镱共掺光纤6,再连接铥钬共掺光纤7,铥钬共掺光纤7和793nm连续光源13分别连接第二合束器8的两个输入端,第二合束器8的输出端连接掺铥光纤9和氟化物光纤10;各部件之间以纤芯对齐的方式熔接在一起。The 1550nm tunable pulsed light source 1 is connected to the 1550nm optical isolator 2, and the 1550nm optical isolator 2 and the 975nm continuous light source-11 are respectively connected to two input terminals of the 1550/975nm wavelength division multiplexer 3, and its output is connected to the erbium-doped The optical fiber 4, the erbium-doped optical fiber 4 and the 975nm continuous light source 212 are respectively connected to the two input ends of the first beam combiner 5, and the output end of the first beam combiner 5 is connected to the erbium-ytterbium co-doped optical fiber 6, and then connected to the thulium-holmium co-doped optical fiber 6. The optical fiber 7, the thulium-holmium co-doped optical fiber 7 and the 793nm continuous light source 13 are respectively connected to the two input ends of the second beam combiner 8, and the output end of the second beam combiner 8 is connected to the thulium-doped optical fiber 9 and the fluoride optical fiber 10; each component They are fused together in such a way that the cores are aligned.

所述的1550nm可调谐脉冲光源1为输出脉宽1-10ns,平均功率1-10mW,重复频率1-100MHz的可调谐光脉冲光源。The 1550nm tunable pulse light source 1 is a tunable light pulse light source with an output pulse width of 1-10ns, an average power of 1-10mW, and a repetition frequency of 1-100MHz.

所述的第一合束器5为(1+1)×1合束器。The first beam combiner 5 is a (1+1)×1 beam combiner.

所述的第二合束器8为(1+2)×1合束器。The second beam combiner 8 is a (1+2)×1 beam combiner.

本发明优点在于通过调节输入脉冲的幅度、频率、包络使输出光谱平坦。The advantage of the invention is that the output spectrum is made flat by adjusting the amplitude, frequency and envelope of the input pulse.

附图说明Description of drawings

图1是本发明一种宽谱平坦的中红外超连续谱光源的结构示意图。Fig. 1 is a structural schematic diagram of a wide-spectrum flat mid-infrared supercontinuum light source of the present invention.

图2是本发明的泵浦光脉冲示意图。Fig. 2 is a schematic diagram of the pump light pulse of the present invention.

具体实施方式detailed description

下面结合实施例和附图对本发明做详细说明,但本发明的保护范围不限于下述实施例。The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention is not limited to the following embodiments.

图1是本发明一种宽谱平坦的中红外超连续谱光源的结构示意图。本实施例中1550nm可调谐纳秒脉冲光源1为可调谐电脉冲激励的DFB激光二极管,其输出平均功率0-10mW可调,重复频率1-100MHz可调,脉宽1-10ns可调。1550nm光隔离器2为非保偏光隔离器,隔离度大于40dB。1550/975nm波分复用器3、975nm连续光源一11和掺铒光纤4构成第一级掺铒光纤放大器,掺铒光纤4为Thorlab公司的M12光纤,长为3.5m,在975nm处的吸收系数约为13dB/m,975nm连续光源一11的最大输出功率为500mW。第一合束器5、975nm连续光源一11和铒镱共掺光纤6构成第二级放大器,铒镱共掺光纤6为Coractive公司的DCF-EY-10/128,长为5.5m,在975nm处的吸收系数为2dB/m,975nm连续光源一11最大输出功率为8W,第一合束器5为(1+1)×1合束器。此时已经可以观测到光谱展宽现象。铥钬共掺光纤7为Coractive公司的TH512,长度为1m。第二合束器8、793nm连续光源13和掺铥光纤9构成第三级放大,掺铥光纤9为Coractive公司的DCF-TM-10/128,长度为7m,793nm连续光源13最大功率为12W,第二合束器8为(2+1)×1合束器。最后接入氟化物光纤10,氟化物光纤10为Coreactive公司的ZSF-9/125-N-0.20。Fig. 1 is a structural schematic diagram of a wide-spectrum flat mid-infrared supercontinuum light source of the present invention. In this embodiment, the 1550nm tunable nanosecond pulse light source 1 is a DFB laser diode excited by tunable electrical pulses. Its output average power is adjustable from 0-10mW, its repetition frequency is adjustable from 1-100MHz, and its pulse width is adjustable from 1-10ns. The 1550nm optical isolator 2 is a non-polarization-maintaining optical isolator, and the isolation is greater than 40dB. 1550/975nm wavelength division multiplexer 3, 975nm continuous light source-11 and erbium-doped fiber 4 form the first-stage erbium-doped fiber amplifier, and erbium-doped fiber 4 is the M12 fiber of Thorlab Company, which is 3.5m long and absorbs at 975nm The coefficient is about 13dB/m, and the maximum output power of 975nm continuous light source-11 is 500mW. The first beam combiner 5, 975nm continuous light source-11 and erbium-ytterbium co-doped fiber 6 form the second-stage amplifier, and the erbium-ytterbium co-doped fiber 6 is DCF-EY-10/128 of Coractive Company, which is 5.5m long and at 975nm The absorption coefficient at is 2dB/m, the maximum output power of the 975nm continuous light source-11 is 8W, and the first beam combiner 5 is a (1+1)×1 beam combiner. At this point, spectral broadening can already be observed. The thulium-holmium co-doped optical fiber 7 is TH512 of Coractive Company, with a length of 1 m. The second beam combiner 8, the 793nm continuous light source 13 and the thulium-doped optical fiber 9 form the third stage of amplification. The thulium-doped optical fiber 9 is DCF-TM-10/128 of Coractive Company, the length is 7m, and the maximum power of the 793nm continuous light source 13 is 12W. , the second beam combiner 8 is a (2+1)×1 beam combiner. Finally, the fluoride optical fiber 10 is connected, and the fluoride optical fiber 10 is ZSF-9/125-N-0.20 of Coreactive Company.

图2为1550nm可调谐纳秒脉冲光源1的输出示例,相对于全光纤结构的实现方式,采用电脉冲激励的方式可以自由调节脉冲光源的频率、幅度和脉宽,通过调节以上参数,可以实现宽谱平坦的中红外超连续谱光源。Figure 2 is an example of the output of the 1550nm tunable nanosecond pulse light source 1. Compared with the realization of the all-fiber structure, the frequency, amplitude and pulse width of the pulse light source can be freely adjusted by means of electric pulse excitation. By adjusting the above parameters, it can realize Broad-spectrum flat mid-infrared supercontinuum light source.

Claims (4)

1. the mid-infrared super continuum source that a wide range is smooth, including the tunable nanosecond pulse light source (1) of 1550nm, 975nm continuous light source one (11), 975nm continuous light source two (12), 793nm continuous light source (13), 1550nm optoisolator (2), 1550/975nm wavelength division multiplexer (3), the first bundling device (5), the second bundling device (8), Er-doped fiber (4), erbium-ytterbium co-doped fiber (6), Tm Ho co doped fiber (7), thulium doped fiber (9), fluoride fiber (10), it is characterised in that:
nullLight-pulse generator that described 1550nm is tunable (1) is connected with 1550nm optoisolator (2),1550nm optoisolator (2) and 975nm continuous light source one (11) connect two inputs of 1550/975nm wavelength division multiplexer (3) respectively,Its output connects Er-doped fiber (4),Er-doped fiber (4) and 975nm continuous light source two (12) connect two inputs of the first bundling device (5) respectively,The outfan of the first bundling device (5) connects erbium-ytterbium co-doped fiber (6),Connect Tm Ho co doped fiber (7) again,Tm Ho co doped fiber (7) and 793nm continuous light source (13) connect two inputs of the second bundling device (8) respectively,The outfan of the second bundling device (8) connects thulium doped fiber (9) and fluoride fiber (10);It is welded together in the way of fibre core alignment between each parts.
2. the mid-infrared super continuum source that a kind of wide range according to claim 1 is smooth, it is characterized in that, light-pulse generator that 1550nm is tunable (1) is output wavelength 1550nm, output pulse width 1-10ns, the tunable optical light-pulse generator of mean power 1-10mW, repetition rate 1-100MHz.
3. the mid-infrared super continuum source that a kind of wide range according to claim 1 is smooth, it is characterised in that described the first bundling device (5) is (1+1) × 1 bundling device.
4. the mid-infrared super continuum source that a kind of wide range according to claim 1 is smooth, it is characterised in that described the second bundling device (8) is (1+2) × 1 bundling device.
CN201610308103.3A 2016-05-11 2016-05-11 Mid-infrared super-continuous spectrum light source capable of achieving flat wide spectrum Pending CN105762624A (en)

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Application publication date: 20160713