CN106451048B - The fiber laser system that base rank can be switched with the second harmonic mode locking can be achieved - Google Patents
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Abstract
本发明提供了一种可实现基阶与二阶谐波锁模可切换的光纤激光系统，采用基于反射式石墨烯饱和吸收镜的全保偏光纤锁模技术，采用全保偏光纤谐振腔；全保偏光纤谐振腔可避免环境中外力(压力、弯曲等)引起的光纤双折射变化造成锁模激光不稳定；可保持激光以单一线偏振方向沿保偏光纤慢轴在腔内传输，更易实现锁模脉冲自启动；可减少偏振控制器等元件的使用，降低腔内损耗等优势。所述反射式石墨烯可饱和吸收镜，采用5层以上石墨烯作为可饱和吸收体，石墨烯的调制深度随层数增加而增加，在泵浦功率79mW到102mW获得了基阶锁模脉冲，在到达108mW时获得了二阶锁模脉冲。
The present invention provides a switchable fiber laser system capable of realizing fundamental-order and second-order harmonic mode-locking, which adopts a fully polarization-maintaining optical fiber mode-locking technology based on a reflective graphene saturated absorber mirror, and adopts a fully polarization-maintaining optical fiber resonator; The full polarization-maintaining fiber resonator can avoid the instability of the mode-locked laser caused by the birefringence change of the fiber caused by external forces (pressure, bending, etc.) in the environment; it can keep the laser in the cavity with a single linear polarization direction along the slow axis of the polarization-maintaining fiber, making it easier Realize self-starting of mode-locked pulses; reduce the use of components such as polarization controllers, reduce intracavity losses, and other advantages. The reflective graphene saturable absorber mirror uses more than 5 layers of graphene as a saturable absorber, and the modulation depth of graphene increases with the number of layers, and the fundamental mode-locked pulse is obtained at a pump power of 79mW to 102mW. A second-order mode-locked pulse was obtained when reaching 108mW.
Description
技术领域technical field
本发明涉及一种石墨烯被动锁模光纤激光器，属于激光技术领域。The invention relates to a graphene passive mode-locked fiber laser, belonging to the technical field of lasers.
背景技术Background technique
脉冲光纤激光器作为脉冲光源具有结构紧凑，稳定性高，转化效率高，光束质量好，易维护和成本低等优势，在工业加工，医疗，通信等领域具有广泛的应用前景。尤其基于光纤锁模技术的超短脉冲研究在精细加工，光纤传感，精密光学测量等领域潜力巨大。目前所报道的主要锁模光纤激光技术包括非线性偏振旋转(nonlinear polarizationevolution，NPR)锁模、非线性光纤环镜(nonlinear optical loop mirrors，NOLM)锁模、半导体可饱和吸收镜(semiconductor saturable absorber mirror，SESAM)锁模以及单壁碳纳米管(single-walled carbon nanotubes，SWNT)锁模等。NPR与NOLM技术的缺点是在激光腔内加入的起偏器和偏振控制器等元件导致了腔内更多损耗。SESAM制作和封装工艺复杂，价格昂贵且可饱和吸收谱范围较窄。SWNT因其作用波长与其纳米管直径尺寸相关，对波长具有选择性，从而限制了其应用。As a pulsed light source, pulsed fiber laser has the advantages of compact structure, high stability, high conversion efficiency, good beam quality, easy maintenance and low cost. It has broad application prospects in industrial processing, medical treatment, communication and other fields. In particular, the ultrashort pulse research based on optical fiber mode-locking technology has great potential in fine processing, optical fiber sensing, precision optical measurement and other fields. The main mode-locked fiber laser technologies reported so far include nonlinear polarization rotation (NPR) mode-locking, nonlinear optical loop mirrors (NOLM) mode-locking, semiconductor saturable absorber mirror (semiconductor saturable absorber mirror) , SESAM) mode-locking and single-walled carbon nanotubes (single-walled carbon nanotubes, SWNT) mode-locking, etc. The disadvantage of NPR and NOLM technology is that components such as polarizers and polarization controllers added in the laser cavity lead to more losses in the cavity. SESAM manufacturing and packaging process is complex, expensive and the range of saturable absorption spectrum is narrow. Because the wavelength of SWNT is related to the diameter of its nanotube, SWNT is selective to wavelength, which limits its application.
石墨烯自2004年问世以来，以其独特的非线性光学特性，及优秀的可饱和吸收特性而获得越来越多的关注。其独特的线性能带结构，可使其在很宽的光谱范围(300～3000nm)实现非线性饱和吸收；另外，石墨烯还具有较高的调制深度、高的损伤阈值、超快的恢复时间，价格低廉、易于制作等优点。所以，基于石墨烯的光调制技术已经成为脉冲光纤激光器的研究热点。Since its appearance in 2004, graphene has attracted more and more attention due to its unique nonlinear optical properties and excellent saturable absorption properties. Its unique linear energy band structure enables it to achieve nonlinear saturation absorption in a wide spectral range (300-3000nm); in addition, graphene also has a high modulation depth, high damage threshold, and ultra-fast recovery time , low price, easy to manufacture and other advantages. Therefore, graphene-based optical modulation technology has become a research hotspot for pulsed fiber lasers.
2009年，南洋理工大学Bao等首次以石墨烯作为可饱和吸收体实现了脉冲宽度为756fs，重复频率为1.79MHz，中心波长为1565nm的掺铒锁模光纤激光输出。2010年，剑桥大学Sun等采用石墨烯作为可饱和吸收体，通过腔内加入带通滤波器，获得中心波长在1525～1559nm之间可调谐的孤子脉冲输出。2013年，山东大学冯德军等采用少层石墨烯可饱和吸收体在环形腔中通过改变两个光纤活动接头之间的空气腔的长度实现了激光波长在1557～1561nm范围内连续可调谐脉冲输出。2014年，香港理工大学He等基于石墨烯实现熔锥光纤倏逝场锁模，通过改变腔内的偏振态实现了脉冲宽度在2.32～9.24ps的可调谐输出。2015年，弗罗茨瓦夫科技大学Jaroslaw等以60层石墨烯作为可饱和吸收体结合色散补偿光纤实现了脉冲宽度为88fs的锁模激光输出。同年，剑桥大学Purdie等基于透射式石墨烯可饱和吸收体实现全光纤结构锁模激光输出，并通过腔外压缩获得脉冲宽度29fs的超短脉冲。但是这些石墨烯饱和吸收体被动锁模光纤激光器容易受环境的变化而不稳定，这意味着它们是对诸如显著温度变化和机械扰动这类外部引起的变化较为敏感的，这将影响光纤的双折射特性，致使锁模激光器稳定性降低。In 2009, Bao et al. of Nanyang Technological University used graphene as a saturable absorber for the first time to realize the output of erbium-doped mode-locked fiber laser with a pulse width of 756fs, a repetition frequency of 1.79MHz, and a center wavelength of 1565nm. In 2010, Sun et al. from the University of Cambridge used graphene as a saturable absorber and added a bandpass filter in the cavity to obtain a tunable soliton pulse output with a central wavelength between 1525 and 1559 nm. In 2013, Feng Dejun of Shandong University and others used a few-layer graphene saturable absorber to achieve continuous tunable pulse output in the range of 1557-1561nm by changing the length of the air cavity between two optical fiber movable joints in the ring cavity. . In 2014, He et al. of Hong Kong Polytechnic University realized evanescent field mode-locking of fused-cone fiber based on graphene, and achieved tunable output with pulse width of 2.32-9.24 ps by changing the polarization state in the cavity. In 2015, Jaroslaw of Wroclaw University of Technology achieved a mode-locked laser output with a pulse width of 88 fs using 60-layer graphene as a saturable absorber combined with dispersion compensating fiber. In the same year, Purdie et al. from the University of Cambridge realized all-fiber structure mode-locked laser output based on a transmissive graphene saturable absorber, and obtained an ultrashort pulse with a pulse width of 29 fs through extracavity compression. But these graphene saturable absorber passively mode-locked fiber lasers are vulnerable to environmental changes, which means that they are sensitive to externally induced changes such as significant temperature changes and mechanical perturbations, which will affect the fiber's dual performance. Refractive properties, resulting in reduced stability of mode-locked lasers.
因此，需要一种能有效地实现可调谐的脉冲输出的全保偏光纤锁模技术，可实现基阶与二阶谐波锁模可切换的光纤激光系统。Therefore, there is a need for a fully polarization-maintaining fiber mode-locking technology that can effectively realize tunable pulse output, and can realize a switchable fiber laser system with fundamental-order and second-order harmonic mode-locking.
发明内容Contents of the invention
本发明提供一种可实现基阶与二阶谐波锁模可切换的光纤激光系统，采用基于反射式石墨烯饱和吸收镜的全保偏光纤锁模技术，包括全保偏掺铒光纤激光器，所述全保偏掺铒光纤激光器包括1m熊猫型保偏掺铒光纤、980/1550保偏波分复用器、石墨烯可饱和吸收镜、30％输出保偏耦合器、保偏环形器和976nm激光二极管；所述全保偏掺铒光纤激光器采用全保偏光纤谐振腔。The present invention provides a switchable fiber laser system capable of realizing fundamental-order and second-order harmonic mode-locking, which adopts a fully polarization-maintaining fiber-optic mode-locking technology based on a reflective graphene saturable absorption mirror, including a fully polarization-maintaining erbium-doped fiber laser, The full polarization-maintaining erbium-doped fiber laser includes a 1m Panda-type polarization-maintaining erbium-doped fiber, a 980/1550 polarization-maintaining wavelength division multiplexer, a graphene saturable absorber, a 30% output polarization-maintaining coupler, a polarization-maintaining circulator and 976nm laser diode; the full polarization-maintaining erbium-doped fiber laser adopts a full polarization-maintaining fiber resonator.
所述保偏光纤和保偏器件均由Fujikura光纤熔接机(FSM-100)沿慢轴精确对准熔接。Both the polarization-maintaining fiber and the polarization-maintaining device were accurately aligned and spliced along the slow axis by a Fujikura fiber fusion splicer (FSM-100).
所述保偏掺铒光纤(Nufern公司，PM-ESF-7/125)在976nm处的吸收系数约为24dB/m，在1550nm波长处具有约-0.02ps2/m的群速度色散(group velocity dispersion，GVD)。The absorption coefficient of described polarization-maintaining erbium-doped fiber (Nufern company, PM-ESF-7/125) at 976nm place is about 24dB/m, has about-0.02ps2/m group velocity dispersion (group velocity dispersion) at 1550nm wavelength place , GVD).
所述保偏环形器具有较高的隔离度(～50dB)，可以实现激光在腔内的单向传输，并可把十层石墨烯可饱和吸收镜有效接入到全保偏光纤谐振腔内；所述全保偏光纤谐振腔总腔长约为6.5m，总群速度色散约为-0.13ps2。The polarization-maintaining circulator has a high isolation (~50dB), can realize the unidirectional transmission of the laser in the cavity, and can effectively connect the ten-layer graphene saturable absorber mirror into the full polarization-maintaining fiber resonator ; The total cavity length of the full polarization-maintaining fiber resonator is about 6.5m, and the total group velocity dispersion is about -0.13ps2.
所述光纤激光系统是由带单模尾纤输出的976nm激光二极管(Laser Diode，LD)进行反向泵浦。The fiber laser system is back-pumped by a 976nm laser diode (Laser Diode, LD) with a single-mode pigtail output.
所述光纤激光系统采用反射式石墨烯可饱和吸收镜，相比于目前常见的基于透射式结构石墨烯锁模的全保偏光纤激光器，具有更灵活的调节空间，便于腔内激光增益和损耗的调节。The fiber laser system uses a reflective graphene saturable absorber mirror, which has a more flexible adjustment space compared to the current common full polarization-maintaining fiber laser based on a transmission structure graphene mode-locking, which is convenient for intracavity laser gain and loss adjustment.
所述全保偏光纤谐振腔可避免环境中外力(压力、弯曲等)引起的光纤双折射变化造成锁模激光不稳定；可保持激光以单一线偏振方向沿保偏光纤慢轴在腔内传输，更易实现锁模脉冲自启动；可减少偏振控制器等元件的使用，降低腔内损耗等优势。The full polarization-maintaining fiber resonator can avoid the instability of the mode-locked laser caused by the birefringence change of the fiber caused by external forces (pressure, bending, etc.) in the environment; it can keep the laser in the cavity along the slow axis of the polarization-maintaining fiber in a single linear polarization direction , it is easier to realize the self-starting of the mode-locked pulse; it can reduce the use of components such as polarization controllers, and reduce the loss in the cavity.
所述反射式石墨烯可饱和吸收镜，采用5层以上石墨烯作为可饱和吸收体，石墨烯的调制深度随层数增加而增加，在调制深度不够的情况下不能产生二阶锁模输出；在泵浦功率79mW到102mW获得了基阶锁模脉冲，在到达108mW时获得了二阶锁模脉冲，实现了无偏振调节情况下，仅依靠调节泵浦功率实现基阶锁模和二阶锁模可切换输出的单一线偏振飞秒激光光源。The reflective graphene saturable absorber mirror adopts more than 5 layers of graphene as a saturable absorber, and the modulation depth of graphene increases with the number of layers, and the second-order mode-locking output cannot be generated when the modulation depth is not enough; The fundamental mode-locked pulse was obtained when the pump power was 79mW to 102mW, and the second-order mode-locked pulse was obtained when the pump power reached 108mW. In the case of no polarization adjustment, the fundamental and second-order mode-locked pulses can be achieved only by adjusting the pump power. A single linearly polarized femtosecond laser source with mode-switchable output.
应当理解，前述大体的描述和后续详尽的描述均为示例性说明和解释，并不应当用作对本发明所要求保护内容的限制。It should be understood that both the foregoing general description and the following detailed description are exemplary illustrations and explanations, and should not be used as limitations on the claimed content of the present invention.
附图说明Description of drawings
参考随附的附图，本发明更多的目的、功能和优点将通过本发明实施方式的如下描述得以阐明，其中：With reference to the accompanying drawings, more objects, functions and advantages of the present invention will be clarified through the following description of the embodiments of the present invention, wherein:
图1是本发明中基于反射式石墨烯可饱和吸收镜锁模的全保偏掺铒光纤激光器示意图，其中101为1m熊猫型保偏掺铒光纤101、102为980/1550保偏波分复用器、103为石墨烯可饱和吸收镜、104为30％输出保偏耦合器、105为保偏环形器、106为976nm激光二极管。Fig. 1 is a schematic diagram of a fully polarization-maintaining erbium-doped fiber laser based on reflective graphene saturable absorber mirror mode-locking in the present invention, wherein 101 is a 1m panda-type polarization-maintaining erbium-doped fiber 101, 102 is 980/1550 polarization-maintaining wavelength division multiplexing 103 is a graphene saturable absorber mirror, 104 is a 30% output polarization maintaining coupler, 105 is a polarization maintaining circulator, and 106 is a 976nm laser diode.
图2示意性示出石墨烯可饱和吸收镜锁模脉冲序列，表示获得的基阶锁模的脉冲的示意，便于与二阶锁模对比。)Fig. 2 schematically shows the graphene saturable absorbing mirror mode-locked pulse sequence, which represents the schematic diagram of the obtained fundamental-order mode-locked pulse, which is convenient for comparison with the second-order mode-locked. )
图3示意性示出石墨烯可饱和吸收镜锁模激光器的自相关轨迹。Figure 3 schematically shows the autocorrelation trajectory of a graphene saturable absorber mirror mode-locked laser.
图4示意性示出十层石墨烯可饱和吸收镜锁模激光器的频谱。Figure 4 schematically shows the spectrum of a mode-locked laser with a deca-graphene saturable absorber mirror.
图5示意性示出二阶谐波锁模激光的：图5(a)脉冲序列，图5(b)频谱，图5(c)自相关轨迹，图5(d)光谱。Fig. 5 schematically shows the second-order harmonic mode-locked laser: Fig. 5(a) pulse sequence, Fig. 5(b) spectrum, Fig. 5(c) autocorrelation trace, Fig. 5(d) spectrum.
具体实施方式Detailed ways
通过参考示范性实施例，本发明的目的和功能以及用于实现这些目的和功能的方法将得以阐明。然而，本发明并不受限于以下所公开的示范性实施例；可以通过不同形式来对其加以实现。说明书的实质仅仅是帮助相关领域技术人员综合理解本发明的具体细节。The objects and functions of the present invention and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.
在下文中，将参考附图描述本发明的实施例。在附图中，相同的附图标记代表相同或类似的部件，或者相同或类似的步骤。Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.
如图1所示，本发明提供一种可实现基阶与二阶谐波锁模可切换的光纤激光系统，包括全保偏掺铒光纤激光器，所述全保偏掺铒光纤激光器包括1m熊猫型保偏掺铒光纤101、980/1550保偏波分复用器102、石墨烯可饱和吸收镜103、30％输出保偏耦合器104、保偏环形器105和976nm激光二极管106，所述全保偏掺铒光纤激光器采用全保偏光纤谐振腔。As shown in Figure 1, the present invention provides a switchable fiber laser system that can realize fundamental-order and second-order harmonic mode-locking, including a full polarization-maintaining erbium-doped fiber laser, and the full polarization-maintaining erbium-doped fiber laser includes a 1m Panda Type polarization-maintaining erbium-doped fiber 101, 980/1550 polarization-maintaining wavelength division multiplexer 102, graphene saturable absorber mirror 103, 30% output polarization-maintaining coupler 104, polarization-maintaining circulator 105 and 976nm laser diode 106, described Fully polarization-maintaining erbium-doped fiber lasers use fully polarization-maintaining fiber resonators.
所述保偏光纤和保偏器件均由Fujikura光纤熔接机(FSM-100)沿慢轴精确对准熔接。Both the polarization-maintaining fiber and the polarization-maintaining device were accurately aligned and spliced along the slow axis by a Fujikura fiber fusion splicer (FSM-100).
所述全保偏掺铒光纤激光器由带单模尾纤输出的976nm激光二极管106(LaserDiode，LD)进行反向泵浦。The fully polarization-maintaining erbium-doped fiber laser is reverse pumped by a 976nm laser diode 106 (LaserDiode, LD) with a single-mode pigtail output.
所述1m熊猫型保偏掺铒光纤101(Nufern公司，PM-ESF-7/125)在976nm处的吸收系数约为24dB/m，在1550nm波长处具有约-0.02ps2/m的群速度色散(group velocitydispersion，GVD)。保偏环形器105因具有较高的隔离度(～50dB)，可以实现激光在腔内的单向传输，并可把十层石墨烯可饱和吸收镜有效接入到全保偏光纤谐振腔内。所述全保偏光纤谐振腔总腔长约为6.5m，总群速度色散约为-0.13ps2。The absorption coefficient at 976nm of described 1m Panda-type polarization-maintaining erbium-doped fiber 101 (Nufern company, PM-ESF-7/125) is about 24dB/m, has the group velocity dispersion of about-0.02ps2/m at 1550nm wavelength place (group velocity dispersion, GVD). Due to its high isolation (~50dB), the polarization-maintaining circulator 105 can realize the one-way transmission of laser light in the cavity, and can effectively connect the ten-layer graphene saturable absorber mirror into the full polarization-maintaining fiber resonator . The total cavity length of the full polarization-maintaining fiber resonator is about 6.5m, and the total group velocity dispersion is about -0.13ps2.
本发明中使用的石墨烯制备方法如下：The graphene preparation method used in the present invention is as follows:
通过化学气相沉积(chemical vapor deposition，CVD)法沉积在铜箔载片上；Deposited on a copper foil carrier by chemical vapor deposition (chemical vapor deposition, CVD);
使用低温转移方法，利用PMMA高分子溶液逐层转移到保护金反射镜上，使石墨烯与反射镜充分接触，避免产生气泡；Using the low-temperature transfer method, the PMMA polymer solution is used to transfer layer by layer to the protective gold mirror, so that the graphene can fully contact the mirror and avoid the generation of air bubbles;
利用丙酮将PMMA溶解去除。PMMA was dissolved and removed with acetone.
采用此方法可得到高质量的单层或多层石墨烯饱和吸收镜103。以下实验结果均基于十层石墨烯作为可饱和吸收体得出。Using this method, a high-quality monolayer or multilayer graphene saturated absorption mirror 103 can be obtained. The following experimental results are based on ten-layer graphene as a saturable absorber.
所述反射式石墨烯可饱和吸收镜103采用精确十层石墨烯作为可饱和吸收体，在泵浦功率79mW到102mW获得了基阶锁模脉冲，在到达108mW时获得了二阶锁模脉冲，石墨烯可饱和吸收镜103可实现在中心波长1557.57nm处锁模激光输出；当泵浦功率到达79mW时，调节石墨烯可饱和吸收镜103角度并将其固定，得到稳定的锁模脉冲输出，3dB谱宽为4.60nm。The reflective graphene saturable absorber mirror 103 uses precise ten-layer graphene as a saturable absorber, and obtains a fundamental mode-locked pulse when the pump power reaches 79mW to 102mW, and obtains a second-order mode-locked pulse when the pump power reaches 108mW. The graphene saturable absorbing mirror 103 can realize the mode-locked laser output at the central wavelength of 1557.57nm; when the pump power reaches 79mW, adjust the angle of the graphene saturable absorbing mirror 103 and fix it to obtain a stable mode-locked pulse output, The 3dB spectral width is 4.60nm.
当泵浦功率为102mW时，3dB谱宽为6.61nm，平均功率为3.634mW，对应的单脉冲能量为0.12nJ，输出脉冲的宽度约为502fs，峰值功率为202.4W，如图3所示；基于十层石墨烯的锁模脉冲基频为31.4687MHz；激光器的信噪比(signal noise ratio,SNR)大于75dB，说明激光器处于高稳定的锁模状态，如图4所示；同时，通过消光比测试仪研究了输出激光的偏振度。结果发现，输出锁模激光的偏振消光比大于18.0dB。When the pump power is 102mW, the 3dB spectral width is 6.61nm, the average power is 3.634mW, the corresponding single pulse energy is 0.12nJ, the output pulse width is about 502fs, and the peak power is 202.4W, as shown in Figure 3; The fundamental frequency of the mode-locked pulse based on ten-layer graphene is 31.4687MHz; the signal noise ratio (SNR) of the laser is greater than 75dB, indicating that the laser is in a highly stable mode-locked state, as shown in Figure 4; The ratio tester studies the degree of polarization of the output laser light. It is found that the polarization extinction ratio of the output mode-locked laser is greater than 18.0dB.
当泵浦功率升至108mW时，通过示波器可以观测到相邻脉冲间隔为15.95ns的二阶谐波锁模脉冲序列，如图5(a)所示。这是因为一个光孤子脉冲分裂为两个相邻很近的光孤子脉冲,接着由于两个光孤子脉冲的相互作用,使得光脉冲重新分布进而出现稳定的等脉冲间距的二阶谐波锁模激光。图5(b)为二阶谐波锁模脉冲的频谱，重复频率为62.94MHz，其SNR大于54dB，表明系统稳定运行。图5(c)为自相关仪采集的脉冲自相关信号，脉冲宽度为852fs。图5(d)为二阶谐波锁模的光谱，3dB谱宽为3.61nm。When the pump power increases to 108mW, the second-order harmonic mode-locked pulse sequence with adjacent pulse intervals of 15.95ns can be observed through the oscilloscope, as shown in Figure 5(a). This is because one optical soliton pulse is split into two adjacent optical soliton pulses, and then due to the interaction of the two optical soliton pulses, the optical pulse is redistributed and a stable second-order harmonic mode-locking with equal pulse spacing occurs. laser. Figure 5(b) is the spectrum of the second-order harmonic mode-locked pulse, the repetition frequency is 62.94MHz, and its SNR is greater than 54dB, indicating that the system operates stably. Figure 5(c) is the pulse autocorrelation signal collected by the autocorrelator, and the pulse width is 852fs. Figure 5(d) is the spectrum of the second-order harmonic mode-locking, and the 3dB spectral width is 3.61nm.
本发明中采用反射式石墨烯可饱和吸收镜，在泵浦功率79mW到102mW获得了基阶锁模脉冲，在到达108mW时获得了二阶锁模脉冲，实现无偏振调节情况下，仅依靠调节泵浦功率实现基阶锁模和二阶锁模可切换输出的单一线偏振飞秒激光光源。In the present invention, a reflective graphene saturable absorber is used, and the fundamental mode-locked pulse is obtained when the pump power is 79mW to 102mW, and the second-order mode-locked pulse is obtained when the pump power reaches 108mW. In the case of no polarization adjustment, only the adjustment A single linearly polarized femtosecond laser source with pump power that can switch between fundamental-order mode-locking and second-order mode-locking.
本发明中采用全保偏光纤谐振腔，可避免环境中外力(压力、弯曲等)引起的光纤双折射变化造成锁模激光不稳定；可保持激光以单一线偏振方向沿保偏光纤慢轴在腔内传输，更易实现锁模脉冲自启动；可减少偏振控制器等元件的使用，降低腔内损耗等优势。In the present invention, the full polarization-maintaining fiber resonator is used, which can avoid the instability of the mode-locked laser caused by the birefringence change of the fiber caused by external forces (pressure, bending, etc.) in the environment; it can keep the laser in a single linear polarization direction along the slow axis of the polarization-maintaining fiber Intra-cavity transmission makes it easier to realize the self-starting of mode-locked pulses; it can reduce the use of components such as polarization controllers and reduce intra-cavity losses.
结合这里披露的本发明的说明和实践，本发明的其他实施例对于本领域技术人员都是易于想到和理解的。说明和实施例仅被认为是示例性的，本发明的真正范围和主旨均由权利要求所限定。Other embodiments of the invention will be apparent to and understood by those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The description and examples are considered exemplary only, with the true scope and spirit of the invention defined by the claims.
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