Tm-doped mode-locked fiber lasers

Ultrashort pulse fiber lasers are increasingly used in various areas for scientific as well as industrial purposes. In contrast to ultrashort pulse lasers based on ytterbium- and erbium-doped fibers, the dispersion of silica fibers in the amplification band of thulium-doped fibers around 2 μm is typically anomalous, which has fundamental impact on the pulse propagation. In this paper, mode-locked thulium-doped fiber lasers operating in different pulse propagation schemes are presented. The transfer of various concepts into the 2 μm wavelength range, which have been successfully applied for pulse parameter scaling in the 1 and 1.5 μm spectral region, are discussed on the basis of experimental and numerical results.     

光纤激光器的应用

作为第三代激光技术的光纤激光器由于采用了双包层分叉光纤和高功率的多模半导体二极管，输出功率已经实现10000W，应用范围已突破狭窄的光纤通讯网络，在激光加工、激光医疗等行业得以日益广泛的应用。光纤激光器具有绝对理想的光束质量、超高的转换效率、完全免维护、高稳定性以及体积小等优点，将对传统的激光行业产生巨大而积极的影响，从而改写光应用的历史篇章。     

High-power double-clad fiber lasers

Rare-earth doped, laser-diode-pumped, single-mode, double-clad fiber lasers are studied in detail, experimentally and theoretically, with particular attention to properties of scaling to higher output powers. Gain saturation, spontaneous emission, fiber propagation loss, and the optimum output coupler are considered for oscillator design and laser performance. Thermal properties are investigated, including the thermal fracture limit, the decrease of quantum efficiency with increasing pump power through the temperature dependence of multiphonon decay and ion-ion energy transfer, and thermal lensing. Self-focusing and Raman effects are briefly considered. It is shown that output powers in the tens of watts range are readily feasible with available double-clad fiber lasers     

Strongly pumped fiber lasers

Strongly pumped fiber lasers are analyzed, based on a rate equation model. Examples include Nd³⁺-doped and Yb³⁺ -doped fiber lasers, with distributed Bragg reflector mirrors at either end. Approximate analytical and quasi-analytical expressions are shown to be in excellent agreement with the exact numerical solution of the rate equations, and both agree well with recently published experimental data     

光子晶体光纤激光器

结合光子晶体光纤简述了光子晶体光纤激光器的类型、结构及性能 ,介绍了光子晶体光纤激光器的研究进展和应用前景     

光纤激光器的相干合成技术

介绍了光纤激光器相干合成的研究现状,分析了几种典型的相干合成方法,指出了最佳的相干合成方法。     

高功率光纤激光器

1、引言。所谓高功率光纤激光器是相对于光纤通讯中作为载波的低功率光纤激光器而言(功率为mW级)，是定位于机械加工、激光医疗、汽车制造和军事等领域的高强度光源。高功率光纤激光器巧妙地将光纤技术与激光原理有机地融为一体，铸造了21世纪最选进和最犀利的激光器。即使是在激光技术发达的国家，光纤激光器也是尖端、神秘和充满诱惑的代名词、2002年6月，光纤激光器空降中国，震撼了中国激光学术界和产业界，并引起了至尊院士的关注。     

高功率光纤激光器发展概况

高功率光纤激光器以其优越的性能和超值的价格,在光通信、印刷、打标、材料加工、医疗等领域有着广阔的应用,将会很大程度上替代传统激光器,并开辟一些新的激光应用领域,扩大激光产业的规模.概述国内外高功率光纤激光器的发展历史与现状.展望了高功率光纤激光器的发展前景.     

波长可调谐被动锁模光纤激光器

为在光纤激光器中获得特定中心波长的锁模激光,进行了采用非线性光纤环形镜锁模的掺Yb3+光纤激光器的波长可调谐实验研究。获得了自启动锁模、中心波长在1030nm~1081nm范围内连续调谐的锁模脉冲输出;在中心波长1053nm时,测得光谱带宽6nm、脉冲宽度234.375ps、输出功率2.05mW、重复频率3.842MHz。这种被动锁模光纤激光器的锁模过程可以完全自启动,几乎不受外界环境变化的影响,可以长时间稳定工作,不仅可以提供特定中心波长的锁模激光,而且有望成为其它科学研究工作的中心波长可调谐的宽带锁模光纤激光种子源。     

光纤光栅激光器

概述了光纤光栅激光器的特点及其作为光通信系统中的光源所具有的优点。综述了单波长、多波长光纤光栅激光器的发展情况,并阐述了光纤光栅激光器的应用前景。     

Brillouin/erbium fiber lasers

Brillouin/erbium fiber lasers (BEFLs) have been recently demonstrated as a novel mode of operation of a fiber laser. In a hybrid Brillouin/erbium fiber laser, the combination of two gain media, the gain from the erbium-doped fiber (EDF) and Brillouin gain in single-mode optical fibers allows a resonator to be constructed which supports a laser comb with ~10 GHz or ~0.1 nm line spacing at room temperature. In this paper, we present a detailed discussion of the operation of BEFLs. Single and multiple wavelength generation is discussed, and modeling of single wavelength operation is described     

Multisoliton complexes in fiber lasers

The formation of stationary and non-stationary pulse groups is regularly observed in multiple pulse soliton fiber lasers. The environment developed in this study for the flexible investigation of this phenomenon is based on the cavity comprising a semiconductor saturable absorber mirror (SESAM) with complex dynamics of absorption recovery and all-fiber dispersion management. The detailed experimental and theoretical considerations show that multiple pulsing in fiber systems offers numerous embodiments ranging from stationary bound states to chaotic bunches. The pulse interaction through the dispersive waves was found to produce a principal impact on the bound state formation. The stability and transformation of stationary bound states and bunch propagation have been also addressed.     

激光雷达用高性能光纤激光器

系统研究了窄线宽低噪声单频连续光纤激光器、高能量纳秒长脉冲单频光纤激光器以及高峰值功率纳秒短脉冲光纤激光器三类高性能光纤激光器:实现了工作于1、1.5及2 m波段的单频连续光纤激光器,典型光谱线宽小于3 kHz,强度噪声接近于散粒噪声极限;实现了高能量单频光纤激光器,脉冲能量超过200 J,重复频率20 kHz,脉冲宽度100~500 ns,激光波长位于1.5 m波段;实现了高峰值功率纳秒短脉冲光纤激光器,峰值功率超过700 kW,重复频率10 kHz,脉冲宽度3 ns;同时还实现了高重频高峰值功率纳秒短脉冲光纤激光器,峰值功率超过200 W,重复频率3 MHz,脉冲宽度1~5 ns。文中阐述了以上几类高性能光纤激光器在激光雷达探测系统中的应用前景。     

基于SESAM的被动调Q光纤光栅掺铒光纤激光器

提出并研究了一种线性腔结构的基于 SESAM(半导体可饱和吸收镜)的被动调 Q光纤光栅掺铒光纤激光器,该激光器无需采用偏振控制器控制激光偏振态,简化了调 Q 激光器的结构。该激光器的中心波长为1549.975 nm,阈值功率为143 mW,斜效率为1.2%。当泵浦功率从149 mW增加到180 mW时,脉冲重复频率从5.431 kHz增加到9.778 kHz。当泵浦功率为155 mW时,激光脉冲的能量为5.6 nJ,重复频率为6.538 kHz,脉冲宽度为40μs。     

Optimization of strongly pumped fiber lasers

Backreflection of the residual pump power into the cavity, and optimization of the fiber length, may significantly improve the efficiency of a strongly pumped fiber laser. A rate equation model is introduced and studied. Examples for Yb³⁺-doped fiber lasers, with DBR mirrors at either end, show that employing such a geometry results in higher efficiency with shorter optimal fiber length. Approximate analytical and quasi-analytical expressions are shown to be in excellent agreement with the exact numerical solution of the rate equations     

Widely tunable single-frequency erbium-doped fiber lasers

In this letter, we report on experimental results on a 70-nm-wide quasi-continuously tunable single-frequency erbium-doped fiber (EDF) laser, in which the laser produced a single-longitudinal mode oscillation between 1510-1580 nm, an output power of 0.5 mW, and a tuning step of about 25 MHz. The cavity incorporates three tunable bandpass filters (TBFs): a bulk-grating-based TBF, a fiber-ring-cavity filter, and an autotracking saturable absorption-induced grating filter generated by an unpumped EDF. This laser had a frequency drift of 100 MHz and a signal-to-source spontaneous emission ratio higher than 60 dB.     

Thermal effects in kilowatt fiber lasers

Thermal effects and their influences on kilowatt ytterbium-doped double-clad (YDDC) fiber lasers are studied through numerical modeling. Solutions to suppress the thermal effects in the YDDC fiber lasers under bidirectional end pump and distributed pump are presented and compared for the first time. It is shown that lower operating temperature and more uniform heat dissipation in fibers can be obtained by optimizing the arrangement of pump powers, pump absorption coefficients, and fiber lengths.     

光纤黄光激光器的研究进展

相对于固体黄光激光器,光纤黄光激光器结构简单紧凑、可集成为一体、易于调节、便于维护,在现代医疗、材料加工、光谱分析、军事以及天文观测领域、激光引导星等技术领域有迫切的需求.综述了国际上光纤黄光激光器的研究方法、进展情况,对各种方法所面临的技术问题进行了对比分析和讨论.     

掺镱全光纤激光器研究

用自制耦合器搭建了全光纤激光振荡器,通过不同的泵浦方式对全光纤激光器进行了实验研究。实验装置中加入包层光剥离器,纤芯/包层分别为20/400 μm的有源光纤作为增益光纤。实验中未加特定的冷却装置,选用2个110 W激光二极管分别进行前向和后向泵浦,在总泵浦功率223.6 W时,前向泵浦方式中获得激光功率输出152.2 W,光-光转换效率69%;后向泵浦方式中,激光功率输出156.5 W,光-光转换效率70%。最后,进行了双向泵浦实验,泵浦光功率443.8 W时,1080 nm近单模激光功率输出311 W,光-光转换效率70%。进一步增加泵浦功率,会获得更高功率的1080nm激光输出。     

Spectral modeling of Raman fiber lasers

This letter describes a model of Raman fiber lasers, based on the four-wave mixing interaction between the laser modes. The results predict the laser spectral shape and output power with good accuracy.