CN102306897B - Ultra narrow linewidth low noise high power single frequency fiber laser - Google Patents

Ultra narrow linewidth low noise high power single frequency fiber laser Download PDF

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CN102306897B
CN102306897B CN2011102415208A CN201110241520A CN102306897B CN 102306897 B CN102306897 B CN 102306897B CN 2011102415208 A CN2011102415208 A CN 2011102415208A CN 201110241520 A CN201110241520 A CN 201110241520A CN 102306897 B CN102306897 B CN 102306897B
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fiber
polarization maintaining
high
laser
grating
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CN2011102415208A
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CN102306897A (en
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张伟南
张勤远
徐善辉
杨中民
邱建荣
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华南理工大学
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Abstract

The invention discloses an ultra narrow linewidth low noise high power single frequency fiber laser which comprises a single mode semiconductor laser pumped source, a polarization-maintaining wavelength division multiplexing device, a coupling output polarization maintaining fiber raster, a high reflection polarization maintaining fiber raster, a wave plate, a high gain fiber, a low reflection narrow linewidth fiber grating, a dichroscope, a heat sink, a sealed air chamber and a fiber clamp and polarization maintaining fiber isolator. A common end of the polarization-maintaining wavelength division multiplexing device connects with the coupling output polarization maintaining fiber raster. The coupling output polarization maintaining fiber raster and the high reflection polarization maintaining fiber raster are etched on a same polarization maintaining fiber or respectively etched on two strips of polarization maintaining fibers with consistent fast and slow shaft directions in connection, the high reflection polarization maintaining fiber raster connects with the high gain fiber through the wave plate, the high gain fiber connects with the low reflection narrow linewidth fiber grating, and the dichroscope in order. According to the invention, a folding composite chamber and a double virtual annular chamber are constructed in a short straight chamber structure, and a single frequency fiber laser with ultra narrow linewidth and polarization-maintaining output is generated.

Description

ー种超窄线宽低噪声高功率单频光纤激光器ー species ultra low-noise high-power narrow linewidth single-frequency fiber laser

技术领域 FIELD

[0001] 本发明涉及光纤激光器,特别是涉及超窄线宽低噪声高功率的单频光纤激光器,激光器线宽小于几百Hz级、输出功率高达几百mW量级。 [0001] The present invention relates to fiber lasers, particularly narrow linewidth relates to ultra-low-noise high-power single-frequency fiber lasers, laser linewidth less than several hundreds Hz stage, the output power of the order of up to several hundred mW. 背景技术 Background technique

[0002] 超低噪声单频激光因其光谱线宽非常狭窄,激光相干特性极其优异等优势,在相干光通信、光原子钟、重力波探測、量子保密通信等超高精尖端领域有着广阔的应用前景。 [0002] because of its low noise single-frequency laser linewidth is narrow, coherent laser characteristics is extremely excellent advantages, has wide application in the field of ultra sophisticated side coherent optical communication, optical atomic clock, gravity wave detection, quantum cryptography, etc. prospect. 要提高光纤激光的探测距离或精度,需要使用高相干性能的激光,因而要求激光具有超窄线宽,如要求几百Hz量级线宽、mW级的单频光纤激光作为种子源。 To increase the detection range of the fiber laser or precision, require the use of high coherence properties of the laser, which requires a laser having a narrow linewidth over as required width on the order of a few hundred Hz, mW single-frequency fiber laser level as a seed source. 一般石英掺杂光纤很难实现较高功率(> IOOmff),超窄线宽(く200Hz)的单频激光输出。 Silica doped fiber is generally difficult to achieve high power (> IOOmff), ultra-narrow linewidth (ku 200Hz) single frequency laser output.

[0003]目前研究超窄线宽单频光纤激光,采用稀土离子高掺杂的石英光纤作为激光介质,短直FP腔或DBR腔结构,一般只能输出几mW单频激光,采用多组分玻璃光纤作为单频激光的增益介质,则可实现输出功率IOOmW以上、线宽小于2 KHz的单频光纤激光,如采用2cm长的铒镱共掺磷酸盐玻璃光纤,实现了输出功率大于300 mW、线宽小于2 KHz、波长为I. 5μπι 的单频光纤激光[Optics Express, 2010, 18(2) : 1249]。 [0003] The present study ultra narrow linewidth single frequency fiber laser, a rare-earth ion-doped high-silica fibers as a laser medium, and short straight FP or DBR chamber cavity structure, generally only a few mW single frequency laser output, multi-component glass fiber as the gain medium, single frequency laser output power can be achieved IOOmW above, single-frequency fiber laser linewidth is less than 2 KHz, such as the use 2cm long Er-Yb co-doped phosphate glass fiber, to achieve the output power greater than 300 mW the line width is less than 2 KHz, the wavelength of single-frequency fiber laser 5μπι I. the [Optics Express, 2010, 18 (2): 1249]. 2004 年,美国亚历山大大学和NP光子公司在超窄线宽单频光纤激光研究方面申请了稀土掺杂磷酸盐玻璃单模光纤激光器[专利号:US 6816514 B2]和高功率窄线宽单频光纤激光器[公开号:US2004/0240508 Al]两个专利,它是基于(30 〜80)P205- (5 〜30)L203 (L2O3 :A120,B2O3, Y2O3,La2O3 以及它们的混合物)-(5 〜30) MO (MO :BaO, BeO, MgO, SrO, CaO, ZnO, PbO 以及它们的混合物)这种基质的稀土掺杂磷酸盐玻璃单模光纤,并对部分腔型结构进行了权利要求。 In 2004, the American University of Alexandria and NP Photonics fiber laser research, application of rare earth doped phosphate glass single-mode fiber laser in ultra-narrow linewidth single frequency [Patent Number: US 6816514 B2] and high-power narrow linewidth single frequency fiber laser [Publication No: US2004 / 0240508 Al] two patents, it is based (30 ~80) P205- (5 ~30) L203 (L2O3: A120, B2O3, Y2O3, La2O3, and mixtures thereof) - (5 ~ 30 ) MO (MO: BaO, BeO, MgO, SrO, CaO, ZnO, PbO and mixtures thereof) of such a rare earth-doped phosphate glass matrix single-mode fiber, and a portion of the cavity structure as claimed in claim. 2008年,华南理工大学在超窄线宽单频光纤激光研究方面申请了ー种低噪声窄线宽高功率的单纵模光纤激光器[专利号:200810220661. X ]专利,对其腔型结构及保偏的稀土掺杂磷酸盐玻璃单模光纤进行了权利要求。 2008, UNIVERSITY OF SOUTH fiber laser research application the single longitudinal mode fiber laser ー species narrow linewidth high power low noise in the ultra-narrow linewidth single frequency [Patent No:. 200810220661 X] patent, and its cavity structure rare earth-doped polarization-maintaining single-mode fiber was phosphate glass as claimed in claim. 以上文献及发明专利提供的窄线宽单频光纤激光器,其増益光纤均存在空间烧孔效应,且只能实现kHz量级的线宽输出。 Single narrow linewidth and patent documents above provide frequency fiber laser, zo gain fiber which spatial hole burning effects are present, and can achieve line widths of the order of kHz output. 本发明申请提出了ー种新型的谐振腔型结构,通过偏振旋转技术解决増益光纤中的空间烧孔效应,光纤光栅加上全反射镜构成腔内滤波器并分别与前后ー对保偏光纤光栅构成折叠型复合谐振腔,有利于提高谐振腔的腔内寿命,从而达到减小激光线宽(达百Hz量级)的目的。 The present application proposes a novel species ー resonator type structure, a solution zo gain fiber in spatial hole burning, together with the total reflection mirror constituting the fiber grating filter and the cavity respectively on the front and rear ー polarization maintaining fiber grating technology through polarization rotation folded resonator constituting the composite, help to improve the life of the cavity resonator, so as to achieve the purpose of reducing the linewidth (of the order of one hundred Hz) a.

发明内容 SUMMARY

[0004] 本发明的目的在于克服现有技术的缺点,提供ー种超窄线宽低噪声高功率单频光纤激光器,本发明在短直腔结构中构建折叠复合腔及双虚拟环形腔,并能产生超窄线宽(小于百Hz量级)且保偏输出的单频光纤激光。 [0004] The object of the present invention to overcome the disadvantages of the prior art, to provide seed ー ultra low-noise high-power narrow linewidth single-frequency fiber laser, the present invention is constructed and double folding the composite cavity virtual short straight annular chamber in the cavity structure, and It can produce ultra-narrow linewidth (less than one order of Hz) and partial protection single frequency fiber laser output.

[0005] 本发明的的目的通过如下技术方案实现: [0005] The object of the present invention is achieved by the following technical solutions:

[0006] ー种超窄线宽低噪声高功率的单频光纤激光器,包括单模半导体激光泵浦源、保偏波分复用器、稱合输出保偏光纤光栅、高反射保偏光纤光栅、波片、高增益光纤、低反射窄线宽光纤光栅、二色镜、热沉、密封气室和光纤夹具和保偏光纤隔离器,所述单模半导体激光泵浦源与保偏波分复用器的泵浦输入端连接,保偏波分复用器的公共端与耦合输出保偏光纤光栅连接,所述稱合输出保偏光纤光栅和高反射保偏光纤光栅都刻写在同一条保偏光纤上或分别刻写在两条保偏光纤上且连接时快慢轴方向一致,高反射保偏光纤光栅经由波片与高增益光纤连接,高增益光纤再与低反射窄线宽光纤光栅、二色镜顺次连接,其中,耦合输出保偏光纤光栅、高反射保偏光纤光栅、波片、高增益光纤、低反射窄线宽光纤光栅和二色镜共同组成单频激光谐振腔,并固定 [0006] Species ー ultra low-noise high-power narrow linewidth single frequency fiber laser, a semiconductor laser pump source comprises a single mode, polarization division multiplexer, the output of said combined polarization maintaining fiber grating, highly reflective polarization maintaining fiber grating , wave plate, high gain fiber, narrow linewidth fiber grating low-reflection dichroic mirror, a heat sink, a sealing air chamber and clamps the optical fiber and polarization maintaining fiber isolator, the pump single-mode semiconductor laser light source and polarization wave division input of the multiplexer is connected to the pump, PM WDM common terminal coupled to the output polarization maintaining fiber grating connected to the output of said co-polarization and a high reflectivity FBG PM fiber gratings are inscribed in the same slow and fast axes and the same polarization direction are connected to the optical fiber or engraved on two polarization maintaining fiber, a high reflection grating is connected via a polarization maintaining fiber with high gain fiber wave plate, then high gain fiber and narrow linewidth low reflection grating, dichroic mirrors connected in sequence, wherein the biasing security grating fiber-coupled, high polarization maintaining fiber reflective gratings, wave plates, optical high gain, narrow linewidth fiber grating low-reflection dichroic mirror together and form a single-frequency laser resonator, and fixed 封装在自动温度控制的热沉中,同时在热沉上用一密闭气室封装整个单频激光谐振腔,整个单频激光谐振腔的尾纤由一光纤夹具固定在一密闭气室的前端壳面,单频激光谐振腔产生的单频激光经由保偏波分复用器的信号端耦合输出,再经由一保偏光纤隔离器输出;所述高增益光纤的纤芯掺杂高浓度的发光离子,所述发光离子为镧系离子、过渡金属离子中一种或多种的组合体,所述发光离子掺杂浓度大于IX 1019ions/cm3且在其纤芯中是均匀掺杂。 Encapsulated in a heat sink of the automatic temperature control, while on the heat sink with a sealed chamber enclosing the entire single-frequency laser resonator, the entire pigtail single-frequency laser resonator is fixed by a fiber clamp housing in the front end of a sealed chamber surface, to produce single-frequency laser resonator via a single-frequency laser polarization WDM signal terminal coupled to the output, and then outputs a polarization-maintaining optical fiber via a spacer; core of the high-gain fiber doped with a high concentration of light emission ions, the luminescent ions are lanthanide ions, transition metal ions in combination with one or more of the emitting ion doping concentration greater than IX 1019ions / cm3 and in which the core is uniformly doped.

[0007] 上述一种超窄线宽低噪声高功率的单频光纤激光器,所述高增益光纤是普通的稀土掺杂磷酸盐单模玻璃光纤或保偏的稀土掺杂磷酸盐单模玻璃光纤。 [0007] The narrow linewidth an ultra low-noise high-power single-frequency fiber laser, a high gain rare-earth doped optical fiber is a conventional single-mode glass fiber or phosphate of a rare earth-doped polarization-maintaining single-mode glass fiber phosphate .

[0008] 上述一种超窄线宽低噪声高功率的单频光纤激光器,其纤芯成分为磷酸盐玻璃,组成为70P205-8Al203-15Ba0-4La203-3Nd203 ;高增益光纤的单位长度增益大于I dB/cm,光纤长度为O. 5〜5cm。 [0008] The narrow linewidth an ultra low-noise high-power single-frequency fiber laser, which is a core component is a phosphate glass, a composition of 70P205-8Al203-15Ba0-4La203-3Nd203; high gain per unit length of gain fiber is greater than I dB / cm, the fiber length is O. 5~5cm.

[0009] 上述一种超窄线宽低噪声高功率的单频光纤激光器,所述波片是四分之一波片或四分之三波片。 [0009] one of the above ultra-low noise single-frequency narrow linewidth high power fiber laser, the wave plate is a quarter-wave plate or a three-quarter waveplate.

[0010] 上述一种超窄线宽低噪声高功率的单频光纤激光器,所述高反射保偏光纤光栅的快轴或慢轴与波片的轴线成45°夹角。 [0010] The narrow linewidth an ultra low-noise high-power single-frequency fiber laser axis, said high reflecting polarization maintaining fiber grating fast axis or slow axis of the waveplate angle of 45 °.

[0011] 上述一种超窄线宽低噪声高功率的单频光纤激光器,所述耦合输出保偏光纤光栅的快轴或慢轴中心反射波长是与高反射保偏光纤光栅的慢轴或快轴中心反射波长匹配的,即耦合输出保偏光纤光栅的快轴中心反射波长反射谱位于高反射保偏光纤光栅的慢轴中心反射波长反射谱内,或耦合输出保偏光纤光栅的慢轴中心反射波长反射谱位于高反射保偏光纤光栅的快轴中心反射波长反射谱内。 [0011] The narrow linewidth an ultra low-noise high-power single-frequency fiber laser, and the polarization maintaining fiber outcoupling grating fast axis or slow axis of the central reflector is highly reflective wavelength polarization gratings slow or fast axis of the fiber the inner shaft central reflection wavelength matching, i.e. outcoupling polarization maintaining fiber grating fast axis central reflection wavelength of the reflection spectrum in the high reflective polarization maintaining fiber grating of the slow axis of the central reflection wavelength of the reflection spectrum, or coupled output polarization slow axis of the central fiber grating the reflection wavelength of the reflection spectrum in the high reflective polarization maintaining fiber grating reflection wavelength fast axis center reflection spectrum.

[0012] 上述一种超窄线宽低噪声高功率的单频光纤激光器,所述耦合输出保偏光纤光栅的慢轴或快轴中心反射波长为激光输出波长,3dB反射谱宽小于O. 15 nm,中心波长反射率为10〜90% ;所述高反射保偏光纤光栅的快轴或慢轴中心反射波长为激光输出波长,3dB反射谱宽大于O. 15 nm,中心波长反射率大于90% ;所述低反射窄线宽光纤光栅的中心反射波长为激光输出波长,3dB反射谱宽小于O. 15 nm,中心波长反射率为10〜50%。 [0012] The narrow linewidth an ultra low-noise high-power single-frequency fiber laser, the polarization outcoupling slow axis or fast axis of the central reflection wavelength of the fiber grating laser output wavelength, the reflection spectrum width less than 3dB O. 15 nm, the center wavelength reflectance of 10 ~ 90%; the highly reflective polarization maintaining fiber grating fast axis or the slow axis of the center wavelength of the reflected laser output wavelength, 3dB reflection spectrum wider than O. 15 nm, the center wavelength of reflectance greater than 90 %; low reflection center wavelength of the reflected narrow-linewidth fiber laser output wavelength gratings, 3dB reflection spectrum width less than O. 15 nm, the center wavelength of reflectance of 10~50%.

[0013] 上述一种超窄线宽低噪声高功率的单频光纤激光器,所述二色镜为直接在低反射窄线宽光纤光栅研磨抛光后的一侧端面镀上薄膜形成,所述薄膜对激光信号波长反射率大于95%,对泵浦波长透射率大于90%。 [0013] The narrow linewidth an ultra low-noise high-power single-frequency fiber laser, the dichroic mirror is reflected in the low-side narrow linewidth fiber end surface polishing grating directly plated film is formed, the film the laser wavelength of the reflected signal greater than 95%, the transmittance of the pump wavelength is greater than 90%.

[0014] 上述一种超窄线宽低噪声高功率的单频光纤激光器,所述镧系离子为Er3+,Yb3+,Tm3+,Gd3+,Tb3+,Dy3+,Ho3+ 或Lu3+ ;所述过渡金属离子为Cu2+,Co2+,Cr3+,Fe2+ 或Mn2+。 [0014] one of the above ultra-narrow linewidth Low Noise Single Frequency Fiber high power laser, the lanthanide ions to Er3 +, Yb3 +, Tm3 +, Gd3 +, Tb3 +, Dy3 +, Ho3 +, or Lu3 +; said transition metal ion is Cu2 +, Co2 +, Cr3 +, Fe2 + or Mn2 +.

[0015] 所述二色镜为在腔镜表面镀上薄膜或为直接在低反射窄线宽光纤光栅研磨抛光后的一侧端面镀上薄膜,所述薄膜对激光信号波长反射率大于95%,对泵浦波长透射率大于90%。 [0015] The dichroic mirror is coated on the film surface or the mirror is on one side of the low-reflection FBG narrow linewidth polishing end surfaces plated directly on the film, the film on the laser wavelength of the reflected signal greater than 95% , pump wavelength transmittance of greater than 90%.

[0016] 所述f禹合输出保偏光纤光栅与高反射保偏光纤光栅的连接,可以是在同一条保偏光纤上刻写这两种光栅,也可以通过光纤熔接或通过研磨抛光其相应光纤端面后直接对接耦合且它们快慢轴需对齐,两种光栅栅区之间的距离小于5cm。 [0016] The output f and Yu polarization maintaining fiber grating with a high reflection polarization maintaining fiber grating connector, the two gratings may be inscribed on the same partial protection fiber, which may be polished by grinding through respective optical fibers or fiber splicing directly abutting the rear end face thereof and the slow and fast axes need to coupling alignment, the distance between the two grating region is less than 5cm. 所述四分之一波片是对应的波长是为激光输出波长。 The quarter-wave plate corresponding to a wavelength of the laser output wavelength. 所述高增益光纤纤芯直径为3〜10 μ m,包层直径为60〜800 μ m。 The high gain fiber core diameter of 3~10 μ m, a cladding diameter of 60~800 μ m.

[0017] 本发明利用磷酸盐玻璃纤芯材料的高掺杂和高増益特性,设计制作磷酸盐玻璃单模光纤作为激光介质材料,采用短直腔结构,利用耦合输出保偏光纤光栅、低反射窄线宽光纤光栅的选频作用,在泵浦光源的持续抽运下,高反射保偏光纤光栅快轴(或慢轴)反射的线偏振光经由四分之一波片旋转为右旋圆偏振光在高増益光纤纤芯中得到放大,经低反射窄线宽光纤光栅加上全反射腔镜组成的滤波器后滤波反射后,变为与原传播方向相反的右旋圆偏振光,再回到高増益光纤纤芯中得到进ー步放大,此时,圆偏振光在腔内形成ー个虚拟环光路,然后通过四分之一波片变为慢轴(或快轴)线偏振光,在耦合输出保偏光纤光栅的慢轴(或快轴)得到透射输出及部分反射,一部分光透射输出形成保偏单频激光,另一部分反射回来的线偏振光经历了与高反射保 [0017] The present invention makes use of phosphate glass doped core material is higher zo and high gain characteristics, designed as a single mode fiber laser phosphate glass dielectric material, with a short straight cavity structure, the use of polarization maintaining fiber outcoupling grating, a low reflection effect of frequency selective narrow linewidth fiber grating, with continuous pumping of the pump light source, a high reflection polarization maintaining fiber grating fast axis (or slow axis) of the linearly polarized light reflected right-handed circularly rotated via the quarter-wave plate zo-polarized light amplified in the high gain fiber core, filtered after reflection filter is a low-reflection FBG narrow linewidth composition plus the total reflection mirror, becomes opposite to the original propagation direction, right circularly polarized light, and then Back to the enlargement of the high gain obtained in the fiber core further amplified into ー in this case, circularly polarized light is formed ー virtual ring light path within the cavity, and then through the quarter wave plate becomes slow axis (or fast axis) of a linearly polarized light , the slow axis (or fast axis) and the resulting partially transmissive output reflector grating is a polarization maintaining fiber coupled to an output protection, forming part of the light transmissive output polarization maintaining single frequency laser, another portion of the reflected linearly polarized light and a high reflectance experienced Paul 光纤光栅快轴(或慢轴)反射的线偏振光一样的偏振旋转、右旋圆偏振光的放大、滤波、全反射反向、右旋圆偏振光的再次放大,同样在腔内形成另ー个虚拟环光路,最后再偏振旋转为快轴(或慢轴)的线偏振光,然后由高反射保偏光纤光栅快轴(或慢轴)再次反射,如此形成了内含两个虚拟环的一个谐振周期,可有效解决高增益光纤中由于行波导致的烧孔效应。 As linearly polarized light FBG fast axis (or slow axis) reflected by the polarization rotation, right-handed circularly polarized light amplification, filtering, totally reverse, right circularly polarized light again enlarged, the other is also formed in the cavity ーvirtual ring light path, and finally faster polarization rotation axis (or slow axis) of the linearly polarized light, and a highly reflective polarizer protection fiber grating fast axis (or slow axis) reflected again, thus forming a virtual ring containing two a resonant period, can effectively solve the hole burning due to the high gain fiber caused by the traveling wave. 另外,低反射窄线宽光纤光栅与高反射保偏光纤光栅、I禹合输出保偏光纤光栅共同在腔内又形成了一个谐振腔,与原谐振腔共同构成了直腔型复合腔,从而,显著增强了腔内光子的寿命,达到降低激光线宽的目的。 Further, the low reflection fiber grating with narrow linewidth high reflective polarization maintaining fiber grating, the output of the I and Yu common polarization maintaining fiber grating in the cavity and the formation of a cavity, the cavity together with the original configuration of the linear cavity complex cavity, whereby significantly enhance the lifetime of the photon cavity, to reduce the laser linewidth. 特别是,既结合稀土掺杂磷酸盐玻璃单模光纤的单位长度高増益特性、利用耦合输出保偏光纤光栅及低反射窄线宽光纤光栅的窄线宽实现单ー纵模选择,又可以利用低反射窄线宽光纤光栅与全反射二色镜构成的超短内腔选择的纵模与外腔选择的纵模重合,达到更精细的单ー频率选择。 In particular, both incorporated rare-earth doped phosphate glass single-mode fiber per unit length zo high gain characteristic, with a narrow linewidth output fiber coupler partial protection and low reflection grating FBG of the narrow linewidth single-longitudinal mode selection ー, and may be utilized short lumen and the selected longitudinal mode of the external cavity longitudinal mode selected narrow linewidth fiber grating low-reflection dichroic mirror and the total reflection configuration coincides single ー to achieve a finer frequency selection. 本发明基于上述技术优势,可以实现超窄线宽、低噪声、高功率、偏振保持的单频激光输出。 Based on the above technical advantages of the present invention it is possible to achieve extremely narrow linewidth and low noise, high power, polarization maintaining single frequency laser output.

[0018] 与现有技术相比,本发明的技术效果是:厘米量级的高増益稀土掺杂磷酸盐玻璃单模光纤作为激光的増益介质,由耦合输出保偏光纤光栅和高反射保偏光纤光栅组成谐振腔结构的前后腔镜,在单模半导体激光泵浦源的连续激励下,纤芯中的高掺杂稀土粒子发生反转,产生受激发射的信号光,利用四分之一波片对由耦合输出保偏光纤光栅和高反射保偏光纤光栅产生的线偏振光进行旋转并形成圆偏振光,从而形成了内含两个虚拟环形光路的ー个谐振周期,可有效解决高増益光纤中由于行波导致的烧孔效应,从而有利于改善单频激光的噪声特性。 [0018] Compared with the prior art, the technical effect of the invention is: zo centimeter high gain rare-earth doped single mode fiber as a phosphate glass laser gain medium zo, output from the polarization maintaining fiber coupled high reflectance and polarization grating fiber grating resonator structure composed of the front and rear mirrors, under continuous excitation of the single mode semiconductor laser pumping source, a rare earth doped core is higher particle inverted, signal light is generated by stimulated emission, the use of a quarter wave plate linearly polarized light and a high reflectivity FBG partial protection by the polarization maintaining fiber outcoupling grating generated by rotation of circularly polarized light, and is formed so as to form a ring containing two virtual optical path ー resonant cycle, which can effectively address the high gain fiber due to enlargement of hole burning due to the traveling wave, and thus help to improve the noise characteristics of the single frequency laser. 另外,低反射窄线宽光纤光栅与高反射保偏光纤光栅、耦合输出保偏光纤光栅共同在腔内又形成了一个谐振腔,与原谐振腔共同构成了直腔型复合腔,腔长的増加可显著提高腔内光子的寿命,达到降低激光线宽的目的,从而保证了超窄线宽(百Hz量级)单频激光的实现。 Further, the low reflection fiber grating with narrow linewidth high reflective polarization maintaining fiber grating, an output coupled together and polarization maintaining fiber grating formed in a resonator cavity, with the original straight resonator cavity constitute the composite cavity, the cavity length to increase in the cavity can significantly increase the life of photons, to reduce the laser linewidth, thus ensuring ultra narrow linewidth (on the order of one hundred Hz) to achieve a single-frequency laser. 特别是,既结合稀土掺杂磷酸盐玻璃单模光纤的单位长度高增益特性、利用耦合输出保偏光纤光栅及低反射窄线宽光纤光栅的窄线宽实现单ー纵模选择,又可以利用低反射窄线宽光纤光栅与全反射二色镜构成的超短内腔选择的纵模与外腔选择的纵模重合,达到更精细的单ー频率选择,且不容易发生跳模现象。 In particular, both incorporated rare-earth doped phosphate glass single-mode fiber unit length of the high gain characteristic, with a narrow linewidth output fiber coupler partial protection and low reflection grating FBG of the narrow linewidth single-longitudinal mode selection ー, and may be utilized short lumen and the selected longitudinal mode of the external cavity longitudinal mode selected narrow linewidth fiber grating low-reflection dichroic mirror and the total reflection configuration coincides single ー to achieve a finer frequency selection, and not prone to mode hopping phenomenon. 本发明基于上述技术优势,可以实现低噪声、超窄线宽、无跳模的单频激光输出的技术效果。 Based on the above technical advantages of the present invention, can achieve low-noise, ultra-narrow linewidth, the technical effect of mode-hop-free single frequency laser output.

附图说明[0019] 图I为本发明单频光纤激光器原理示意图; BRIEF DESCRIPTION [0019] Figure I a schematic view of the present invention, the principles of the single-frequency fiber laser;

[0020]图2为四分之一波片主轴与高反射保偏光纤光栅快慢轴的位置示意图; [0020] FIG. 2 is a schematic view of the quarter-wave plate spindle position highly reflective polarization maintaining fiber grating of the slow and fast axes;

[0021] 图3为光纤光栅反射光谱设计示意图。 [0021] FIG. 3 is a schematic design FBG reflection spectra.

具体实施方式 Detailed ways

[0022] 下面结合附图和实施例对本发明作进一步的描述,需要说明的是本发明要求保护的范围并不局限于实施例表述的范围。 [0022] The following embodiments in conjunction with the drawings and embodiments of the present invention will be further described, should be noted that the present invention is not limited to the scope of the claimed scope of the expression of the embodiment. [0023] 如图I所示,超窄线宽低噪声高功率单频光纤激光器包括单模半导体激光泵浦源 [0023] As shown in FIG I, ultra-low-noise high-power narrow linewidth single-frequency fiber laser comprises a single mode semiconductor laser pumping source

I、保偏波分复用器(PM-WDM)2、f禹合输出保偏光纤光栅3、高反射保偏光纤光栅4、四分之一波片5、高增益光纤6、低反射窄线宽光纤光栅7、二色镜8、热沉9、密封气室10和光纤夹具 I, polarization division multiplexer (PM-WDM) 2, f and Yu output polarization maintaining fiber grating 3, a highly reflective polarization maintaining fiber grating 4, a quarter wave plate 5, a high gain optical fiber 6, the low reflection narrow linewidth fiber grating 7, the dichroic mirror 8, the heat sink 9, a sealing chamber 10 and the fiber clamp

II、保偏光纤隔离器12。 II, polarization maintaining fiber isolator 12. 其中,I禹合输出保偏光纤光栅3、高反射保偏光纤光栅4、四分之一波片5、高增益光纤6、低反射窄线宽光纤光栅7及二色镜8组成单频光纤激光腔13。 Wherein, the I and Yu output polarization maintaining fiber grating 3, a highly reflective polarization maintaining fiber grating 4, a quarter wave plate 5, a high gain optical fiber 6, the low-reflection FBG narrow linewidth dichroic mirror 7 and 8 form a single frequency fiber laser cavity 13. 单模半导体激光泵浦源I与保偏波分复用器2的泵浦输入端连接,保偏波分复用器2的公共端与率禹合输出保偏光纤光栅3连接,I禹合输出保偏光纤光栅3再与高反射保偏光纤光栅4连接,经由四分之一波片5与高增益光纤6连接,再与低反射窄线宽光纤光栅7与二色镜8连接,保偏波分复用器2的信号端与保偏光纤隔离器12连接,单频光纤激光腔13固定在自动温度控制的热沉9中,再通过光纤夹具11将该热沉封装在一密封气室10中。 Input single-mode semiconductor pump laser pumping source I 2 and PM WDM connections, polarization division multiplexer and a common terminal of output 2 of the polarization maintaining fiber and Yu grating 3 is connected, I and Yu output polarization maintaining fiber gratings FBG 3 and 4 is connected again biased highly reflective security, connected via a quarter-wave plate 5 and the high-gain fiber 6, 8 and then connected to the low reflective fiber grating narrow line width and the dichroic mirror 7, Paul 2 PM WDM signal terminal and the polarization maintaining fiber isolator 12 is connected, single-frequency fiber laser cavity 13 in the heat sink 9 is fixed to the automatic temperature control, and then through the fiber clamp the heat sink 11 enclosed in a sealed gas 10 rooms. 热沉9的温度一般设置在-30〜70°C范围内的任一温度值上,一般设置在25°C,且其控制精度小于O. I°C,通过控制热沉9的温度来调谐激光波长。 Usually the temperature of the heat sink 9 is provided on either a temperature in the range of -30~70 ° C, typically disposed 25 ° C, and the control precision of less than O. I ° C, be tuned by controlling the temperature of the heat sink 9 laser wavelength. 高增益光纤6为稀土掺杂磷酸盐玻璃单模光纤,纤芯基质成分为磷酸盐玻璃,纤芯中稀土掺杂离子为铒、镱、或铒镱共掺。 6 is a high-gain rare-earth doped fiber single-mode fiber phosphate glass, phosphate glass core matrix component, the core is a rare earth dopant ions of erbium, ytterbium, erbium, or ytterbium co-doped.

[0024] 厘米量级的高增益光纤6作为激光的增益介质,由耦合输出保偏光纤光栅3和高反射保偏光纤光栅4组成谐振腔结构的前后腔镜,稱合输出保偏光纤光栅3慢轴(或快轴)的反射谱位于高反射保偏光纤光栅4快轴(或慢轴)的反射谱内,且中心反射波长重合;其中,耦合输出保偏光纤光栅3慢轴(或快轴)的3dB反射谱宽小于O. 15 nm,中心波长反射率为10-90% ;高反射保偏光纤光栅快轴(或慢轴)的3dB反射谱宽大于O. 15 nm,中心波长反射率大于90%。 Partial Fiber [0024] centimeter high gain fiber as the gain medium of the laser 6, the polarization maintaining fiber outcoupling gratings 3 and 4 composed of a highly reflective security grating resonator structure before and after the mirrors, said combined output polarization maintaining fiber grating 3 reflection spectra slow axis (or fast axis) is in the high reflective polarization 4 fast axis (or slow axis) of the reflection spectrum of the fiber grating, and the central reflection wavelength coincide; wherein outcoupling polarization maintaining fiber grating 3 slow axis (or fast axis) reflection spectrum width less than 3dB O. 15 nm, the center wavelength of reflectance of 10-90%; highly reflective polarization maintaining fiber grating fast axis (or slow axis) of the reflection spectrum wider than 3dB O. 15 nm, the center wavelength of the reflected greater than 90%. 泵浦光采用单模半导体激光泵浦源I前向泵浦方式由保偏波分复用器2的泵浦端输入并经由I禹合输出保偏光纤光栅3、高反射保偏光纤光栅4、四分之一波片5 f禹合到激光腔中高增益光纤6的纤芯中,抽运高掺杂的稀土离子,使粒子数发生反转,产生受激发射的信号光,利用四分之一波片5对由I禹合输出保偏光纤光栅3和高反射保偏光纤光栅4产生的线偏振光进行旋转并形成圆偏振光,经低反射窄线宽光纤光栅7加上全反射二色镜8组成的滤波器后滤波反射后,变为与原传播方向相反的右旋圆偏振光,再回到高增益光纤6纤芯中得到进一步放大,从而形成了由两个虚拟环形光路组成的一个谐振周期,最后,形成的线偏振光经由I禹合输出保偏光纤光栅3输出。 Before the single-mode pump light using a semiconductor laser pump source to pump mode I by a polarization division multiplexer input terminal 2 and the pump I and Yu output grating 3 via a polarization maintaining fiber, highly reflective polarization maintaining fiber grating 4 , quarter-wave plate 5 f Yu bonded to the core high-gain laser cavity optical fiber 6, the pumping of highly doped rare earth ions, so that inversion occurs, signal light is generated by stimulated emission, the use of quarter one wave plate 5 pairs of I and Yu output polarization maintaining fiber 3 and the high reflectance grating polarization-maintaining fiber grating 4 generates a linearly polarized light is rotated to form circularly polarized light reflected by the lower narrow line width plus the total reflection fiber grating 7 filtered reflection dichroic mirror 8 post filter composition, becomes opposite to the original propagation direction of right-handed circularly polarized light, and then returned to a high gain fibers 6 to be further enlarged in the core, thereby forming a ring-shaped light by the two virtual path composed of a resonance period, and finally, the line formed by I and Yu polarized output polarization grating 3 via the output fiber. 其中,I禹合输出保偏光纤光栅3和高反射保偏光纤光栅4采用熔接或端面对接方式连接,且它们的快慢轴必须对准;高反射保偏光纤光栅4与四分之一波片5采用紧密对接方式连接,高反射保偏光纤光栅4的端面必需研磨抛光,且其快轴(或慢轴)方向必须与四分之一波片5的主轴夹角成45°角,如图2所示;高增益光纤6与低反射窄线宽光纤光栅7的连接采用熔接或端面研磨抛光对接方式;低反射窄线宽光纤光栅7与二色镜8组成一个具有纵模选择及滤波作用的功能模块,它们的连接采用光纤端面研磨抛光与腔镜紧密对接的方式。 Wherein, the I and Yu output polarization maintaining fiber grating 3 and the high reflectance grating 4 using polarization maintaining fiber end faces butt welded or connected, and they must be aligned with the slow and fast axes; highly reflective polarization maintaining fiber grating with a quarter wave plate 4 5 abutting tightly connected using highly reflective grating polarization maintaining fiber necessary for polishing the end face 4, and the fast axis (or slow axis) direction of the main shaft angle must be quarter-wave plate 5 into a 45 ° angle, as shown in 2; high-gain low-reflection optical fiber 6 is connected with a narrow linewidth fiber grating 7 using welding or butt end surface polishing mode; low-reflection fiber grating 7 and the narrow linewidth dichroic mirror 8 having a composition selected longitudinal mode and the filtering effect functional modules, their connection with the use of optical fiber end face polishing mirror closely abutting manner. 低反射窄线宽光纤光栅7的中心波长反射谱位于耦合输出保偏光纤光栅3慢轴(或快轴)反射谱内,反射谱宽小于O. 15 nm,中心波长反射率为10〜50% ;二色镜8为在腔镜表面镀上薄膜或为直接在低反射窄线宽光纤光栅7研磨抛光后的一侧端面镀上薄膜,薄膜对激光信号波长反射率大于95%,对泵浦波长透射率大于90%。 Low reflection center wavelength of narrow linewidth FBG reflection spectra 7 is located outcoupling grating 3 PM fiber the slow axis (or fast axis) the reflection spectrum, reflection spectrum width less than O. 15 nm, the center wavelength of reflectance of 10~50% ; dichroic mirror 8 is coated on the film surface or the mirror is on one side of the low-reflection FBG narrow linewidth polishing the end face 7 directly on the plating film, the thin film laser wavelength of the reflected signal greater than 95%, of the pump greater than 90% transmittance wavelength. 再结合高增益光纤6的单位长度高增益特性、利用耦合输出保偏光纤光栅3及低反射窄线宽光纤光栅7的窄线宽实现单一纵模选择,同时又必须满足低反射窄线宽光纤光栅7与全反射二色镜8构成的超短内腔选择的纵模与外腔选择的纵模重合的条件,来实现更窄线宽单一频率的高功率激光保偏输出。 Combined with high gain per unit length of the optical fiber 6 high gain characteristic, polarization maintaining fiber using coupling-out grating 3 and the low-reflection FBG narrow line width to achieve narrow linewidth 7 single longitudinal mode selection, while the low-reflection must satisfy narrow linewidth fiber grating 7 coincides with the longitudinal mode of the external cavity longitudinal mode condition selected short lumen configuration of the selected total reflection dichroic mirror 8, to achieve a more narrow linewidth high power single frequency laser output polarization.

[0025] 实施例I [0025] Example I

[0026] 高增益光纤6是稀土掺杂磷酸盐玻璃单模光纤,其作为光纤激光器的增益介质,长度可根据器件激光输出功率大小及耦合输出保偏光纤光栅3的反射谱宽来选择,本例为I. Ocm, 一般为O. 5"Ί0 cm均可。高增益光纤6的纤芯中掺杂高浓度的发光离子是铒和镱,铒、镱稀土离子的掺杂浓度分别是2· 5X 102Clions/cm3>5. OX 102Clions/cm3, 一般要大于IX 1019ions/cm3。纤芯直径为3〜10 μ m,本例为6. O μ m。高增益光纤6的纤芯基质成分为磷酸盐玻璃,其组成为:70P205-8Al203-15Ba0-4La203-3Nd203。稀土离子在其纤芯中是均匀的高浓度掺杂。高增益光纤6是通过钻孔法、管棒法制作预制棒:先把包层玻璃加工处理成直径为30 mm的玻璃棒,再在此玻璃棒中心位置钻出一个直径为I. 44mm的圆孔,然后抛光玻璃圆孔的内表面;其次,把纤芯玻璃加工处理成一个直径为I. 44_的圆棒,然后再抛光此圆棒 [0026] High gain rare-earth doped optical fiber 6 is phosphate glass single-mode optical fiber as the gain medium of the fiber laser, the spectral width of the reflected partial length of the fiber grating device 3 according to the size of the laser output power and the output is coupled to the security option, the present of Example I. Ocm, typically O. 5 "Ί0 cm Available. high gain fiber core doped with a high concentration of 6-emitting ions are erbium and ytterbium, erbium, ytterbium doping concentration of rare earth ions were 2 · 5X 102Clions / cm3> 5. OX 102Clions / cm3, generally greater than IX 1019ions / cm3. core diameter of 3~10 μ m, in this case 6. O μ m. high gain fiber core matrix component is 6-phosphate salts of glass, consisting of:. 70P205-8Al203-15Ba0-4La203-3Nd203 rare earth ions is uniform in its core doped with a high concentration of high gain fibers 6 by drilling method, bar method making a preform tube: first the cladding glass processed into a glass rod of 30 mm in diameter, then a diameter of this drilled glass rod center position I. 44mm round hole, the inner surface of the glass and polished round hole; secondly, the core glass processing processed into a round bar having a diameter of I. 44_, and then polishing this rod 外表面;再次,把纤芯玻璃棒插入到包层玻璃棒中的孔内,组装成一光纤预制棒;最后,把组装好的光纤预制棒放到光纤拉制塔中高温炉中拉制,最终拉制出的稀土掺杂磷酸盐玻璃单模光纤,即为高增益光纤6。 An outer surface; again, the core glass rod is inserted into the hole in the cladding glass rod, assembled into an optical fiber preform; Finally, the assembled optical fiber preform into an optical fiber draw tower drawn in a high temperature furnace, the final drawn out of the rare-earth doped phosphate glass single-mode fiber, that is, high-gain fiber 6.

[0027] 如图3所示,本例的耦合输出保偏光纤光栅3慢轴(或快轴)的中心反射波长为激光输出波长1548. 92 nm,其波长可在1525〜1650nm范围内选择,3dB反射谱宽小于O. 15nm,中心波长反射率为10〜90%,本例中心波长反射率为55%。 Central reflection wavelength [0027] As shown, this embodiment of the polarization maintaining fiber 3 outcoupling grating 3 slow axis (or fast axis) of the laser output wavelength of 1548. 92 nm, the wavelength can be selected within the range 1525~1650nm, 3dB reflection spectrum width less than O. 15nm, the center wavelength of reflectance of 10 ~ 90%, the reflection center wavelength of the present example was 55%. 高反射保偏光纤光栅4快轴(或慢轴)的中心反射波长与耦合输出保偏光纤光栅3慢轴(或快轴)的中心反射波长重合,本例中也为激光输出波长1548. 92 nm, 3dB反射谱宽大于O. 15 nm,中心波长反射率大于90%。 The reflection center wavelength of the central wavelength of the reflected outcoupling protect highly reflective polarization maintaining fiber grating 4 fast axis (or slow axis) of the fiber grating 3 Partial slow axis (or fast axis) coincides, in this case also the laser output wavelength of 1548.92 nm, 3dB reflection spectrum wider than O. 15 nm, the center wavelength of reflectance greater than 90%. 稱合输出保偏光纤光栅3和高反射保偏光纤光栅4组成谐振腔的前后腔镜。 He said combined output polarization maintaining fiber grating 3 and the high reflectance before and after the polarization maintaining fiber grating resonator consisting of mirrors 4. 低反射窄线宽光纤光栅7的中心反射波长同样与耦合输出保偏光纤光栅3慢轴(或快轴)的中心反射波长重合,本例中也为激光输出波长1548. 92 nm,反射谱宽小于O. 15 nm,中心波长反射率为10〜50%,本例中为20%。 Low-reflection narrow linewidth central reflection wavelength of the fiber grating coupled to the output 7 of the same polarization maintaining fiber grating 3 slow axis (or fast axis) coincides with the central reflection wavelength, in this case also the laser output wavelength of 1548. 92 nm, the reflection spectrum width less than O. 15 nm, the center wavelength of reflectance of 10~50%, the present embodiment is 20%. 二色镜8为在腔镜表面镀上薄膜或直接在低反射窄线宽光纤光栅7研磨抛光后的一侧端面镀上薄膜,其材料一般为MgO,薄膜对激光信号波长1548.92 nm的反射率大于95%,对泵浦波长980 nm的透射率大于90%。 The dichroic mirror surface of the mirror 8 is coated on one side of the film or a low reflection grating narrow linewidth fiber end surface polishing 7 plated directly on the film, which material is generally MgO, a thin film laser signal wavelength of 1548.92 nm reflectance greater than 95%, the transmittance for 980 nm pump wavelength is greater than 90%. 低反射窄线宽光纤光栅7与二色镜8组成一个具有纵模选择及滤波作用的功能模块。 Narrow linewidth fiber grating low-reflection dichroic mirrors 7 and 8 and consisting of a longitudinal mode selection function module having a filter effect. 通过设计耦合输出保偏光纤光栅3慢轴(或快轴)的反射谱宽、控制整个激光腔的腔长、以及调节低反射窄线宽光纤光栅7栅区与二色镜8之间的距离,可以实现只有唯一的单纵模激光输出,且无跳模及模式竞争现象。 Partial reflection spectrum by an optical fiber grating designed outcoupling 3 Paul slow axis (or fast axis) is wide, the overall control of the cavity length of the laser cavity, and adjusting the distance between the narrow linewidth 8 low-reflection FBG gate region 7 and the dichroic mirror can be achieved there is only a single longitudinal mode laser output, and mode-hop phenomenon and mode competition. 在激光功率饱和前,随着泵浦功率的不断增强,激光线宽就会不断变窄,最后可以实现百Hz量级的超窄线宽保偏输出。 Before the laser power saturation, with the growing power of the pump laser linewidth will continue narrowing, and finally achieve one hundred Hz can order polarization maintaining ultra-narrow linewidth output. 只要选择耦合输出保偏光纤光栅3慢轴(或快轴)的中心反射波长是设计激光波长值,则可实现所需波长的超窄线宽单频光纤激光。 Just select the outcoupling grating 3 PM fiber the slow axis (or fast axis) of the center wavelength of reflected laser wavelength is the design value can be achieved over a desired wavelength narrow linewidth single frequency fiber laser. 其中,耦合输出保偏光纤光栅3和高反射保偏光纤光栅4采用熔接或端面对接方式连接,且它们的快慢轴必须对准;高反射保偏光纤光栅4与四分之一波片5采用紧密对接方式连接,高反保偏光纤光栅4的端面必需研磨抛光,且其快轴(或慢轴)方向必须与四分之一波片5的主轴夹角成45°角,如图2所示;高增益光纤6与低反射窄线宽光纤光栅7的连接采用熔接或端面研磨抛光对接方式;低反射窄线宽光纤光栅7靠近栅区I〜2_处的一端面需进行研磨抛光,以使低反射窄线宽光纤光栅7与二色镜8采用光纤端面研磨抛光与腔镜紧密对接方式连接。 Wherein the outcoupling gratings polarization maintaining fiber 3 and the high reflectance grating 4 using polarization maintaining fiber end faces butt welded or connected, and they must be aligned with the slow and fast axes; highly reflective polarization maintaining fiber grating 4 and 5 using the quarter-wave plate close interface connected, the anti-high polarization maintaining fiber grating required polishing the end face 4, and the fast axis (or slow axis) direction of the main shaft angle must be quarter-wave plate 5 into a 45 ° angle, as shown in FIG 2 shown; high-gain low-reflection optical fiber 6 is connected with a narrow linewidth fiber grating 7 using welding or polishing the end face butt joint; a low reflection end surface 7 I~2_ narrow linewidth fiber grating at near the gate area in need of polishing, in the low-reflective fiber grating 7 and the narrow linewidth dichroic mirror 8 using the fiber end face polishing and mirror butted closely connected.

[0028] 泵浦光采用单模半导体激光泵浦源I前向泵浦方式由保偏波分复用器2的泵浦端输入并经由I禹合输出保偏光纤光栅3、高反射保偏光纤光栅4、四分之一波片5 I禹合到激光腔中高增益光纤6的纤芯中。 [0028] before the single-mode pump light using a semiconductor laser pump source to pump mode I by a polarization division multiplexer input terminal 2 and the pump I and Yu output grating 3 via a polarization maintaining fiber, highly reflective polarization FBG 4, 5 I Yu quarter-wave plate is bonded to the high-gain laser cavity 6 of the optical fiber core. 在泵浦光源的持续抽运下,抽运高掺杂的稀土离子,使粒子数发生反转,产生受激发射的信号光,高反射保偏光纤光栅4快轴(或慢轴)反射的线偏振光经由四分之一波片5旋转为右旋圆偏振光在高增益光纤6纤芯中得到放大,经低反射窄线宽光纤光栅7加上全反射二色镜8组成的滤波器后滤波反射后,变为与原传播方向相反的右旋圆偏振光,再回到高增益光纤6纤芯中得到进一步放大,此时,圆偏振光在腔内形成一个虚拟环光路,然后通过四分之一波片5变为慢轴(或快轴)线偏振光,在耦合输出保偏光纤光栅3的慢轴(或快轴)得到透射输出及部分反射,一部分光透射输出形成保偏单频激光,另一部分反射回来的线偏振光经历了与高反射保偏光纤光栅4快轴(或慢轴)反射的线偏振光一样的偏振旋转、右旋圆偏振光的放大、滤波、全反射反向、右旋圆偏振光的再次放 In the continuous pumping of the pump source, pump highly doped rare earth ions, so that inversion occurs, to generate stimulated emission of signal light, highly reflective polarization maintaining fiber grating 4 fast axis (or slow axis) reflection linearly polarized light polarized in the high gain amplified in the fiber core 6 via the quarter-wave plate 5 is rotated right-handed circularly, the low-reflection FBG narrow line width plus the total reflection dichroic mirror 7 composed of a filter 8 after filtering reflected opposite to the original propagation direction becomes right circularly polarized light, and then returned to a high gain fibers 6 to be further enlarged in the core, case, circularly polarized light path forming a virtual ring in the cavity, and then quarter-wave plate 5 becomes slow axis (or fast axis) of the linearly polarized light, the slow axis (or fast axis) coupling the output protection fiber partial grating 3 is obtained and partially reflective transmission output, part of the light transmissive output polarization is formed single-frequency laser, another portion of the reflected linearly polarized light experiences the polarization maintaining fiber with high reflectance grating 4 fast axis (or slow axis) of the linearly polarized light as reflected polarization rotation, right-handed circularly polarized light amplification, filtering, whole reflection reverse, right circularly polarized light is put again ,同样在腔内形成另一个虚拟环光路,最后再偏振旋转为快轴(或慢轴)的线偏振光,然后由高反射保偏光纤光栅4快轴(或慢轴)再次反射,如此形成了内含两个虚拟环的一个谐振周期。 , Also formed another virtual cavity ring light path, and finally the fast polarization rotation axis line (or a slow axis) of the polarization, and the partial protection of a highly reflective fiber grating 4 fast axis (or slow axis) reflected again, thus forming the two virtual ring containing one resonant period. 最后,形成的线偏振单频激光经由耦合输出保偏光纤光栅3输出,再次经由980/1550nm的保偏波分复用器2分波输入到1550nm保偏光纤隔离器12的前端,并由保偏光纤隔离器12隔离反射或残留的泵浦光后输出稳定的、偏振保持的、单一纵模的光纤激光,而精密控制热沉9的温度,有利于进一步实现激光波长的稳定性,最终实现了输出波长为1548. 92 nm的超窄线宽、低噪声单频光纤激光保偏输出。 Finally, the linearly polarized single frequency laser bias grating formed in the optical fiber 3 via an output coupled to an output protection, again via the input device PM WDM 980 / 1550nm demultiplexer 2 to the front end of the PM fiber 1550nm separator 12 by Paul partial partitioning reflective optical isolator 12 or after the residual pumping light output stable polarization maintaining single longitudinal mode fiber laser, and the precise temperature control of the heat sink 9 is conducive to further achieve the stability of the laser wavelength, ultimately the output wavelength of 1548. 92 nm ultra narrow linewidth, single frequency low noise fiber laser output polarization.

[0029] 实施例2 [0029] Example 2

[0030] 高增益光纤6是稀土掺杂磷酸盐玻璃单模保偏光纤,其作为光纤激光器的增益介质,长度可根据器件激光输出功率大小及I禹合输出保偏光纤光栅3的反射谱宽来选择,本例为I. Ocm,—般为O. 5〜10 cm均可。 [0030] High gain rare-earth doped optical fiber 6 is phosphate glass single mode polarization maintaining optical fiber as the gain medium of the fiber laser, length of polarization maintaining fiber reflective grating device 3 spectral width of the laser output and the size of the output based on I and Yu is selected, in this case I. Ocm, - and can be generally from O. 5~10 cm. 高增益光纤6纤芯的均勻掺杂高浓度的发光离子是镱,镱离子的掺杂浓度是7. 5 X 102Clions/cm3, 一般要大于IX 1019ions/cm3。 6 uniformly high gain fiber core doped with a high concentration of light-emitting ions are ytterbium doping concentration of ytterbium ions is 7. 5 X 102Clions / cm3, generally greater than IX 1019ions / cm3. 高增益光纤6的纤芯直径为8 μ m,一般为I〜10 μ m均可,采用熊猫眼结构设计其偏振特性,两熊猫眼对称排布、大小一致,与纤芯距离为20〜40 μ m,熊猫眼直经大小为16 μ m, 一般10〜20 μ m均可,包层直径为125 μ m, 一般125〜400 μ m均可。 6 high-gain fiber core diameter is 8 μ m, typically I~10 μ m can, using the black eye polarization characteristic design, symmetrical arrangement of two black eye, the same size, with the core distance of 20~40 μ m, by straight black eye size 16 μ m, can generally 10~20 μ m, a cladding diameter of 125 μ m, and can be generally 125~400 μ m. 高增益光纤6的纤芯基质成分为磷酸盐玻璃,其组成为:70P205-8Al203-15Ba0-4La203-3Nd203。 High gain fiber core matrix component 6 is phosphate glass, consisting of: 70P205-8Al203-15Ba0-4La203-3Nd203. 由于高增益光纤6具有保偏特性,因而具有更高的消光比,同时对弯曲和扭曲应力不敏感,有利于消除单频光纤激光因环境振动引起的噪声和频率漂移,从而进一步提高激光的信噪比,信噪比可达65 dB。 Due to the high gain fibers 6 having polarization characteristics, thus having a higher extinction ratio, while insensitive to bending and torsional stresses, help eliminate a single frequency noise and frequency fiber laser due to environmental vibrations caused by the drift, thereby further improving the signal laser noise ratio, signal to noise ratio of up to 65 dB. 高增益光纤6是通过钻孔法、管棒法制作预制棒:先把包层玻璃加工处理成直径为35 mm的玻璃棒,再在此玻璃棒中心位置钻出一个直径为2. 24mm圆孔,然后抛光玻璃圆孔的内表面,然后再在熊猫眼设计位置钻两个直经为4. 48mm的圆孔,同样抛光两圆孔的内表面;其次,把纤芯玻璃加工处理成一个直径为2. 24mm的圆棒,然后再抛光此圆棒外表面;再次,把另一种多组分玻璃材料(其膨胀系数需大于磷酸盐玻璃的膨胀系数)加工处理成直经为4. 48mm的两条圆棒,抛光此两圆棒的外表面,再把纤芯玻璃棒插入到包层玻璃棒中的中心孔内,两条圆棒玻璃圆棒分别插入到包层玻璃棒中的熊猫眼孔中,组装成一光纤预制棒;最后,把组装好的光纤预制棒放到光纤拉制塔中高温炉中拉制,最终拉制出具有保偏性能的稀土掺杂磷酸盐玻璃单模光纤,即为高増益光纤6。 6 is a high-gain fiber by drilling method, bar method making a preform tube: first cladding glass processed into a 35 mm diameter glass rod, then drilled glass rod having a diameter of this circular center position 2. 24mm then polished inner surface of the glass of the circular hole, and then drilling straight through two circular holes 4. 48mm, the same two circular polished inner surface in black eye design position; secondly, the core diameter of the glass processed into a to 2. 24mm round bar, round bar and then polishing this outer surface; again, the other multi-component glass material (expansion coefficient must be greater than the expansion coefficient of phosphate glass) processed into straight through 4. 48mm the two round bar, this two polishing the outer surface of the round bar, a core glass rod and then inserted into the central hole in the cladding glass rod, the rod two glass rods are inserted into the cladding glass rod panda eyelet, assembled into an optical fiber preform; Finally, the assembled fiber preform into the optical fiber draw tower high temperature furnace drawn, finally drawn out having a rare earth-doped polarization-maintaining properties phosphate glass single-mode fiber , is the enlargement of the high gain fiber 6.

[0031] 本例的耦合输出保偏光纤光栅3慢轴(或快轴)的中心反射波长为激光输出波长1064. 00 nm,其波长可在1000〜1120nm范围内选择,3dB反射谱宽小于O. 10 nm,中心波长反射率为10〜90%,本例中心波长反射率为65%。 [0031] The slow axis of the grating 3 of the present embodiment of the outcoupling polarization maintaining fiber (or fast axis) of the laser output wavelength of the center wavelength of the reflected 1064. 00 nm, the wavelength can be selected within the range 1000~1120nm, 3dB reflection spectrum width less than O . 10 nm, the center wavelength of reflectance of 10 ~ 90%, the reflection center wavelength of the present example was 65%. 耦合输出保偏光纤光栅3和全反射二色镜8组成谐振腔的前后腔镜。 Outcoupling grating polarization maintaining fiber 3 and the total reflection dichroic mirror 8 consisting of longitudinal resonator mirror. 低反射窄线宽光纤光栅7的中心反射波长同样与耦合输出保偏光纤光栅3慢轴(或快轴)的中心反射波长重合,本例中也为激光输出波长1064. 00 nm,反射谱宽小于O. 10 nm,中心波长反射率为10〜50%,本例中为15%。 Low-reflection narrow linewidth central reflection wavelength of the fiber grating coupled to the output 7 of the same polarization maintaining fiber grating 3 slow axis (or fast axis) coincides with the central reflection wavelength, in this case also the laser output wavelength of 1064. 00 nm, the reflection spectrum width less than O. 10 nm, the center wavelength of reflectance of 10~50%, the present embodiment is 15%. 二色镜8为在腔镜表面镀上薄膜或直接在低反射窄线宽光纤光栅7研磨抛光后的ー侧端面镀上薄膜,其材料一般为MgO,薄膜对激光信号波长的反射率大于95%,对泵浦波长976 nm的透射率大于90%。 The dichroic mirror 8 is coated on the film or plated directly on the low-side end surface ー narrow linewidth fiber grating reflector 7 in mirror grinding and polishing the surface of the film, which material is generally MgO, the film reflectance of the laser wavelength of the signal is greater than 95 %, the transmittance of the pump wavelength of 976 nm is greater than 90%. 低反射窄线宽光纤光栅7与二色镜8组成ー个具有纵模选择及滤波作用的功能模块。 Narrow linewidth fiber grating low-reflection dichroic mirrors 7 and 8 composed ー functional modules and a filter having a longitudinal mode selection function. 通过设计耦合输出保偏光纤光栅3慢轴(或快轴)的反射谱宽、控制整个激光腔的腔长、以及调节低反射窄线宽光纤光栅7栅区与二色镜8之间的距离,可以实现只有唯一的单纵模激光输出,且无跳模及模式竞争现象。 Partial reflection spectrum by an optical fiber grating designed outcoupling 3 Paul slow axis (or fast axis) is wide, the overall control of the cavity length of the laser cavity, and adjusting the distance between the narrow linewidth 8 low-reflection FBG gate region 7 and the dichroic mirror can be achieved there is only a single longitudinal mode laser output, and mode-hop phenomenon and mode competition. 在激光功率饱和前,随着泵浦功率的不断增强,激光线宽就会不断变窄,最后可以实现百Hz量级的超窄线宽保偏输出。 Before the laser power saturation, with the growing power of the pump laser linewidth will continue narrowing, and finally achieve one hundred Hz can order polarization maintaining ultra-narrow linewidth output. 只要选择耦合输出保偏光纤光栅3慢轴(或快轴)的中心反射波长是设计激光波长值,则可实现所需波长的超窄线宽单频光纤激光。 Just select the outcoupling grating 3 PM fiber the slow axis (or fast axis) of the center wavelength of reflected laser wavelength is the design value can be achieved over a desired wavelength narrow linewidth single frequency fiber laser. 其中,I禹合输出保偏光纤光栅3和四分之一波片5米用紧密对接方式连接,I禹合输出保偏光纤光栅3的端面必需研磨抛光,且其快轴(或慢轴)方向必须与四分之一波片5的主轴夹角成45°角,如图2所示;高増益光纤6与耦合输出保偏光纤光栅3的快慢轴对准;高増益光纤6与低反射窄线宽光纤光栅7的连接采用熔接或端面研磨抛光对接方式;低反射窄线宽光纤光栅7靠近栅区I〜2mm处的一端面需进行研磨抛光,以使低反射窄线宽光纤光栅7与二色镜8采用光纤端面研磨抛光与腔镜紧密对接方式连接。 Wherein, the I and Yu output PM fiber gratings 3 and 5 meters with a quarter-wave plate connected tightly butted, the I output and Yu polarization maintaining fiber end face polishing grating 3 is necessary, and it fast axis (or slow axis) angle between the direction of the spindle must be quarter-wave plate 5 into a 45 ° angle, shown in Figure 2; zo high gain fiber 6 and the polarization maintaining fiber coupled to the output shaft speed of the alignment grating 3; zo high gain fiber and the low reflection 6 narrow linewidth fiber grating 7 is connected using welding or polishing the end face butt joint; a low reflection end surface 7 I~2mm narrow linewidth fiber grating near the gate region need of grinding and polishing, so that low-reflection FBG narrow linewidth 7 and using the dichroic mirror 8 and the fiber end face polishing mirror close interface connected.

[0032] 泵浦光采用976nm的单模半导体激光泵浦源I前向泵浦方式由980/1064nm的保偏波分复用器2的泵浦端输入并经由I禹合输出保偏光纤光栅3、四分之一波片51禹合到激光腔中高増益光纤6的纤芯中。 [0032] 976nm pump light using a single mode semiconductor laser pump source to pump before I embodiment by the pump end 980 / 1064nm wavelength division multiplexer 2 polarization-maintaining input and output via the I and Yu polarization maintaining fiber grating 3, a quarter wave plate 51 into the laser cavity and Yu zo high gain fiber core 6. 在泵浦光源的持续抽运下,抽运高掺杂的稀土离子,使粒子数发生反转,产生受激发射的信号光,高反射保偏光纤光栅4快轴(或慢轴)反射的线偏振光经由四分之一波片5旋转为右旋圆偏振光在高増益光纤6纤芯中得到放大,经低反射窄线宽光纤光栅7加上全反射二色镜8组成的滤波器后滤波反射后,变为与原传播方向相反的右旋圆偏振光,再回到高増益光纤6纤芯中得到进ー步放大,此吋,圆偏振光在腔内形成ー个虚拟环光路,然后通过四分之一波片5变为慢轴(或快轴)线偏振光,在耦合输出保偏光纤光栅3的慢轴(或快轴)得到透射输出及部分反射,一部分光透射输出形成保偏单频激光,另ー部分反射回来的线偏振光经历了与高反射保偏光纤光栅4快轴(或慢轴)反射的线偏振光一样的偏振旋转、右旋圆偏振光的放大、滤波、全反射反向、右旋圆偏振光的再次放 In the continuous pumping of the pump source, pump highly doped rare earth ions, so that inversion occurs, to generate stimulated emission of signal light, highly reflective polarization maintaining fiber grating 4 fast axis (or slow axis) reflection linearly polarized light is amplified in the high gain fiber zo core 6 via the quarter-wave plate 5 is rotated right-handed circularly polarized light reflected by the narrow-linewidth fiber grating low-7 plus the total reflection mirror 8 dichroic filter consisting of after filtering reflected opposite to the original propagation direction becomes right circularly polarized light, and then returned to a high enlargement of gain fiber 6 into the core obtained in step ー amplification, this inch, circularly polarized ring is formed ー virtual optical paths within the cavity , then through the quarter wave plate 5 becomes slow axis (or fast axis) of the linearly polarized light, the slow axis (or fast axis) coupling the output protection fiber partial grating 3 and the transmissive output obtained partially reflective, transmissive portion of the light output is formed as a single frequency laser polarization, the other part ー reflected linearly polarized light experiences the polarization maintaining fiber with high reflectance grating 4 fast axis (or slow axis) of the linearly polarized light reflected polarization rotation, right circularly polarized light amplification , filtering, reverse reflection, right circularly polarized light is put again ,同样在腔内形成另ー个虚拟环光路,最后再偏振旋转为快轴(或慢轴)的线偏振光,然后由高反射保偏光纤光栅4快轴(或慢轴)再次反射,如此形成了内含两个虚拟环的一个谐振周期。 , Also formed in the cavity ー another virtual ring light path, and finally the fast polarization rotation axis line (or a slow axis) of the polarization, and the partial protection of a highly reflective fiber grating 4 fast axis (or slow axis) reflected again, so forming a virtual resonance period containing two rings. 最后,形成的线偏振单频激光经由耦合输出保偏光纤光栅3输出,再次经由980/1064nm的保偏波分复用器2分波输入到1064nm保偏光纤隔离器12的前端,并由保偏光纤隔离器12隔离反射或残留的泵浦光后输出稳定的、偏振保持的、单一纵模的光纤激光,而精密控制热沉9的温度,有利于进一步实现激光波长的稳定性,最终实现了输出波长为I. 06 μ®的超窄线宽、低噪声单频光纤激光保偏输出。 Finally, the linearly polarized single frequency laser bias grating formed in the optical fiber 3 via an output coupled to an output protection, again via the input device PM WDM 980 / 1064nm demultiplexer 2 to the front end of the PM fiber 1064nm separator 12 by Paul partial partitioning reflective optical isolator 12 or after the residual pumping light output stable polarization maintaining single longitudinal mode fiber laser, and the precise temperature control of the heat sink 9 is conducive to further achieve the stability of the laser wavelength, ultimately the output wavelength of I. 06 μ® ultra narrow linewidth, single frequency low noise fiber laser output polarization.

Claims (10)

1. 一种超窄线宽低噪声高功率的单频光纤激光器,其特征在于包括单模半导体激光泵浦源(I)、保偏波分复用器(2)、耦合输出保偏光纤光栅(3)、高反射保偏光纤光栅(4)、波片、高增益光纤(6)、低反射窄线宽光纤光栅(7)、二色镜(8)、热沉(9)、密封气室(10)和光纤夹具(11)和保偏光纤隔离器(12),所述单模半导体激光泵浦源(I)与保偏波分复用器(2)的泵浦输入端连接,保偏波分复用器(2)的公共端与耦合输出保偏光纤光栅(3)连接,所述稱合输出保偏光纤光栅(3)和高反射保偏光纤光栅(4)都刻写在同一条保偏光纤上或分别刻写在两条保偏光纤上且连接时快慢轴方向一致,高反射保偏光纤光栅(4)经由波片(5)与高增益光纤(6)连接,高增益光纤(6)再与低反射窄线宽光纤光栅(7)、二色镜(8)顺次连接,其中,稱合输出保偏光纤光栅(3)、高反射保 An ultra-low noise single-frequency narrow linewidth high power fiber laser, comprising a single-mode semiconductor laser pumping source (the I), polarization division multiplexer (2), polarization maintaining fiber grating outcoupling (3), a high reflectance grating polarization maintaining fiber (4), the wave plate, a high gain fiber (6), the low reflection narrow linewidth fiber grating (7), a dichroic mirror (8), a heat sink (9), the gas seal chamber (10) and the fiber clamp (11) and a polarization maintaining fiber isolator (12), said single-mode semiconductor laser pumping source (I) connected to the input of the pump polarization wavelength division multiplexer (2), PM WDM (2) coupled to the output end of the common polarization maintaining fiber grating (3) is connected to the output of said combined polarization maintaining fiber grating (3) and the high reflectance grating polarization maintaining fiber (4) are inscribed with a polarization axis direction and the same speed of the optical fiber connector are engraved on two or polarization maintaining fiber, highly reflective polarization maintaining fiber grating (4) is connected via a wave plate (5) and the high gain fiber (6), a high gain an optical fiber (6) and then with a low-reflection narrow linewidth fiber grating (7), a dichroic mirror (8) are sequentially connected, wherein said combined output polarization maintaining fiber grating (3), highly reflective security 光纤光栅(4)、波片(5)、高增益光纤(6)、低反射窄线宽光纤光栅(7)和二色镜(8)共同组成单频激光谐振腔(13),并固定封装在自动温度控制的热沉(9)中,同时在热沉(9)上用一密闭气室(10)封装整个单频激光谐振腔(13),整个单频激光谐振腔(13)的尾纤由一光纤夹具(11)固定在一密闭气室(10)的前端壳面,单频激光谐振腔(13)产生的单频激光经由保偏波分复用器(2)的信号端耦合输出,再经由一保偏光纤隔离器(12)输出;所述高增益光纤(6)的纤芯掺杂高浓度的发光离子,所述发光离子为镧系离子、过渡金属离子中一种或多种的组合体,所述发光离子掺杂浓度大于IX 1019ions/cm3且在其纤芯中是均匀掺杂。 Fiber grating (4), the wave plate (5), a high gain fiber (6), the low reflection narrow linewidth fiber grating (7) and a dichroic mirror (8) together form a single-frequency laser resonator (13), and fixed to the package in the heat sink (9), automatic temperature control, while on the heat sink (9) with a sealed chamber (10) enclosing the entire single-frequency laser resonator (13), the entire single-frequency end of the laser cavity (13) fiber is fixed by a fiber clamp (11) in a closed air chamber (10) of the front end surface of the housing, single-frequency laser resonator (13) generates single frequency laser signal is coupled via a polarization maintaining wavelength division multiplexer (2) output, and then through a polarization maintaining fiber output isolator (12); said high gain fiber (6) of the core is doped with a high concentration of luminescent ions, the luminescent ions are lanthanide ions, transition metal ions of one or more combinations thereof, said luminescent ions doping concentration greater than IX 1019ions / cm3 and in which the core is uniformly doped.
2.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于:所述高增益光纤(6 )是普通的稀土掺杂磷酸盐单模玻璃光纤或保偏的稀土掺杂磷酸盐单模玻璃光纤。 The ultra-narrow linewidth I the low noise high-power single-frequency fiber laser as claimed in claim, wherein: said high-gain fiber (6) is an ordinary single mode rare earth doped phosphate glass fiber or polarization maintaining rare earth phosphate doped single-mode glass fiber.
3.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于:所述所述高增益光纤(6)为稀土掺杂磷酸盐单模玻璃光纤,其纤芯成分为磷酸盐玻璃,组成为70P205-8Al203-15Ba0-4La203-3Nd203 ;高增益光纤(6)的单位长度增益大于I dB/cm,光纤长度为0. 5〜5cm。 The ultra-narrow linewidth I the low noise high-power single-frequency fiber laser of claim, wherein: said high-gain fiber (6) is a rare earth-doped phosphate glass single-mode optical fiber, which fiber the core component is a phosphate glass, a composition of 70P205-8Al203-15Ba0-4La203-3Nd203; high-gain fiber (6) per unit length of the gain is greater than I dB / cm, a fiber length of 0. 5~5cm.
4.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于:所述波片是四分之一波片或四分之三波片。 The ultra-narrow linewidth I the low noise high-power single-frequency fiber laser as claimed in claim, wherein: the wave plate is a quarter-wave plate or a three-quarter waveplate.
5.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于所述高增益光纤纤芯直径为3〜10 ii m,包层直径为60〜800 um。 The ultra-narrow linewidth I the low noise high-power single-frequency fiber laser as claimed in claim, wherein said high-gain fiber core diameter of 3~10 ii m, cladding diameter of 60~800 um.
6.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于:所述高反射保偏光纤光栅(4)的快轴或慢轴与波片(5)的轴线成45°夹角。 The ultra-narrow linewidth I the low noise high-power single-frequency fiber laser as claimed in claim, wherein: said high reflective grating polarization maintaining fiber (4) of the fast axis or the slow axis of the wave plate (5) the axis angle of 45 °.
7.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于:所述耦合输出保偏光纤光栅(3)的快轴或慢轴中心反射波长是与高反射保偏光纤光栅(4)的慢轴或快轴中心反射波长匹配的,即耦合输出保偏光纤光栅(3)的快轴中心反射波长反射谱位于高反射保偏光纤光栅(4)的慢轴中心反射波长反射谱内,或耦合输出保偏光纤光栅(3)的慢轴中心反射波长反射谱位于高反射保偏光纤光栅(4)的快轴中心反射波长反射谱内。 The ultra-narrow linewidth I the low noise high-power single-frequency fiber laser as claimed in claim, wherein: said coupling-out fast axis or slow axis of a polarization maintaining fiber central reflection wavelength grating (3) is high reflective polarization maintaining fiber grating (4) of the slow axis or fast axis of the central reflection wavelength matching, i.e. outcoupling polarization maintaining fiber grating (3) in the fast axis central reflection wavelength of the reflection spectrum is located slow highly reflective polarization maintaining fiber grating (4) the inner shaft central wavelength of the reflection spectrum of the reflection, or polarization maintaining fiber grating coupling-out (3) the slow axis of the center wavelength of the reflection spectrum of the reflection polarization maintaining fiber in the high reflective grating (4) fast axis center wavelength of the reflection spectrum of the reflection.
8.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于:所述耦合输出保偏光纤光栅(3)的慢轴或快轴中心反射波长为激光输出波长,3dB反射谱宽小于0. 15 nm,中心波长反射率为10〜90% ;所述高反射保偏光纤光栅(4)的快轴或慢轴中心反射波长为激光输出波长,3dB反射谱宽大于0.15 nm,中心波长反射率大于90% ;所述低反射窄线宽光纤光栅(7)的中心反射波长为激光输出波长,3dB反射谱宽小于0.15 nm,中心波长反射率为10〜50%。 The ultra low noise single-frequency narrow linewidth high power fiber laser according to claim I, wherein: said polarization maintaining fiber outcoupling grating (3) of the slow axis or fast axis of the central reflection wavelength laser output wavelength, 3dB reflection spectrum width of less than 0. 15 nm, the center wavelength of reflectance of 10 ~ 90%; the highly reflective grating polarization maintaining fiber (4) of the fast axis or the slow axis of the center wavelength of the reflected laser output wavelength, 3dB reflection spectra wider than 0.15 nm, the center wavelength of reflectance greater than 90%; narrow line width of the low reflection fiber grating (7) for the central reflection wavelength of the laser output wavelength, 3dB reflection spectrum width of less than 0.15 nm, the center wavelength of reflectance of 10~50 %.
9.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于:所述二色镜(8)为直接在低反射窄线宽光纤光栅(7)研磨抛光后的一侧端面镀上薄膜形成, 所述薄膜对激光信号波长反射率大于95%,对泵浦波长透射率大于90%。 Low according to claim I of the ultra-narrow linewidth single-frequency noise high power fiber laser, wherein: said dichroic mirror (8) is directly reflected in the lower narrow linewidth fiber grating (7) polishing side rear end surface plated film is formed, the thin film laser wavelength of the reflected signal greater than 95%, the transmittance of the pump wavelength is greater than 90%.
10.根据权利要求I所述的超窄线宽低噪声高功率的单频光纤激光器,其特征在于:所述镧系离子为Er3+,Yb3+, Tm3+, Gd3+, Tb3+, Dy3+, Ho3+或Lu3+ ;所述过渡金属离子为Cu2+,Co2+, Cr3+,Fe2+或Mn2+。 Low according to claim I of the ultra-narrow linewidth noise single-frequency high-power fiber laser, wherein: the lanthanide ions are Er3 +, Yb3 +, Tm3 +, Gd3 +, Tb3 +, Dy3 +, Ho3 +, or Lu3 +; the said transition metal ion is Cu2 +, Co2 +, Cr3 +, Fe2 + or Mn2 +.
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