光纤锁模激光器：从单模时域耗散孤子锁模到多模时空耗散孤子锁模（特邀）

在光纤锁模激光器中,模式相位锁定产生周期短脉冲的过程称为锁模过程,产生的脉冲在广义上被称为“光耗散孤子”。光纤锁模激光器从传统的单模光纤锁模激光器发展到了多模光纤锁模激光器,锁模机理从一维（1D）时域耗散孤子锁模发展到了（3+1）维时空耗散孤子锁模。通过深入理解耗散孤子的产生机理,有望进一步推动光纤锁模激光器在科学和应用领域的发展,为更多领域带来更多创新和可能性。首先介绍单模光纤锁模激光器中的一维时域耗散孤子锁模,探讨不同色散区域中时域耗散孤子的产生机理;随后介绍多模光纤锁模激光器中时空耗散孤子的最新研究成果,讨论模间色散的补偿方法,揭示其丰富的时空锁模机理和潜在的应用场景;最后对光纤锁模激光器的发展前景进行展望。     

基于混合锁模的铥钬共掺光纤激光器研究

报道了一种基于非线性放大环镜和二硒化钼可饱和吸收体的混合锁模光纤激光器.该激光器采用双环形结构,以铥钬共掺光纤作为增益光纤.通过优化泵浦功率和偏振态,实验获得了调Q锁模脉冲、单脉冲、2～5多脉冲、脉冲束及脉冲束的2～4次谐波等5种输出状态.相比于单一锁模方式,混合锁模方式不但能使激光器实现自启动锁模,而且还能丰富其脉冲动力学状态.     

锁模光纤激光器的研究进展

综述了锁模激光器的研究现状.详细阐述了近年来几种研究比较热门的锁模光纤激光器的原理、结构和发展.展望了光纤锁模激光器技术的发展前景.     

基于非线性偏振旋转锁模孤子光脉冲的产生及模拟

非线性偏振旋转(NPR)技术是被动锁模光纤激光器中实现超短脉冲的一种有效方式,因其结构紧凑,可靠性高而备受关注。本文利用基于NPR锁模的掺铒光纤激光器,在1557.7 nm波段,获得了脉冲宽度为1.35 ps,基频重复率为9.49 MHz的脉冲序列输出。利用耦合的金兹堡-朗道方程,数值模拟了激光器中锁模孤子光脉冲的产生,并对锁模建立过程中孤子时域和频域演化进行了分析,模拟分析和实验观察相吻合。该结果有助于加深人们对NPR锁模光纤激光器中孤子锁模动力学特性的理解。     

被动锁模激光器的关键技术与研究进展

概述了被动锁模光纤激光器的分类,介绍了锁模激光器的工作原理以及特点.分析了碳纳米管、石墨烯等可饱和吸收体在被动锁模光纤激光器中的应用,介绍了光子晶体光纤的特点及其在锁模光纤激光器的应用,总结了被动锁模光纤激光器的发展前景及其需要解决的问题.     

主动锁模光纤激光器的锁相稳定方法

对主动锁模光纤激光器的锁相环路进行了改进,提出一种通过使用"变带宽锁相环"来改善主动锁模光纤激光器稳定性的方法.该方法主要依据信号误差电压实时控制环路的带宽,使环路带宽随锁定信号的频率差动态改变,以达到快速锁定信号的目的,从而提高锁模光纤激光器输出光脉冲的频率稳定性.利用Matlab软件的Simulink功能模块对其实效性进行了仿真验证.结果表明,采用该方法,锁相环的捕捉性能和跟踪性能提高了,主动锁模光纤激光器的工作稳定性得到进一步改善.     

利用拍频反馈控制调制频率实现再生锁模的光纤激光器

根据EDFA中的传输方程分析了再生锁模光纤激光器的自启动过程,指出采用拍频反馈控制调制频率实现再生锁模光纤激光器运转的前提,是利用在工作波长范围内呈现反常色散特性的谐振腔所具有的自发调制现象来把腔内连续或准连续光的稳态打破以产生光脉冲.阐述了如何在再生锁模光纤激光器中行之有效地提取误差信号,并通过反馈来控制调制频率,从而在实验中保证了再生锁模光纤激光器在24h的连续运转中一直保持稳定的锁模状态.     

被动锁模光纤激光器的自启动机理的理论研究

本文在考虑光纤激光器的偏振引起的交叉相位调制的情况下研究了光纤激光器的被动锁模的自启动机理，建立了以激光场耦合方程为基础的光纤激光器工作的理论模型，并就该激光器连续工作时的不稳定性作了详细分析。结果表明，被动锁模的自启动可由光纤激光器连续工作的不稳定性产生。     

新型锁模激光染料池

染料池是锁模激光器的关键元件之一.本文简略地介绍了一种经过精心设计的新型锁模激光染料池的特点及结构.该新型染料池在国内若干单位应用均获得满意的结果.该染料池已成为发明专利产品并有小批量产品.     

光纤激光器锁模技术研究进展

锁模光纤激光器能够产生超短脉冲,在众多领域中有着广泛的应用前景。概述了光纤激光器锁模实现技术的基本原理、典型结构和最新研究进展,分析了主动锁模、被动锁模和混合锁模技术的优缺点,并对多波长锁模、拉伸脉冲锁模和基于光子晶体的锁模光纤激光器的最新研究情况进行了介绍和分析。展望了锁模光纤激光器研究的发展方向和急需解决的问题。     

Noise in pulsed injection locking of a passively modelocked laser

In this paper, noise effects related to pulsed injection locking of a passively modelocked laser (PML) are analyzed. A set of nonlinear equations, derived from a soliton perturbation method, is used to describe the modelocked laser pulse evolution, under injection locking. The equations are linearized, and the stability of the injection locked solution is studied. Subsequently, the linear equations are employed to describe the coupling of both the injected signal noise and the internal noise, to the locked pulses. Noise reduction due to the injection process is demonstrated, with important implications for all optical signal regeneration and synchronization     

Application of ABCD Formalism in Theoretical and Experimental Analysis of Actively Modelocked Fiber Laser

Time domain ABCD matrix formalism is a useful model for analyzing the characteristics of actively modelocked fiber laser.Based on this model and given more consideration on the influences of optical fiber dispersion and optical fiber nonlinearity,the laser characteristic of actively modelocked fiber laser is analyzed,and the comparision of the theoretical analsis results with experimental ones is given.     

Role of polarisation rotation in the modelocking of an Er fibre laser

The Letter quantifies the role of nonlinear polarisation ellipse rotation in a modelocked Er fibre laser. The ellipse angle was observed to change by between 1 and 5 degrees when the laser made the transition from continuous wave to modelocked operation.<>     

Self-adjustments of positions of quantised modelocked pulses infigure-eight fibre laser

For the first time, self-adjustments of positions of quantised modelocked optical pulses are observed in a passively harmonic modelocked fibre laser by using a dispersion-imbalanced nonlinear optical loop mirror with lumped dispersive elements     

Passive modelocking of InGaAsP/InP laser diode over wide operating temperature range

The passive modelocked operation of an InGaAsP/InP laser diode, with a novel design of adaptable saturable absorber, up to an operating temperature of 75/spl deg/C, is reported. To the authors' best knowledge, this is the first demonstration of high-temperature operation of a passively modelocked laser diode. The effect of the operating temperature on the operating frequency and the tuning range is described.     

CW injection seeding of a modelocked semiconductor laser

The authors extended the injection locking technique to control the output of a modelocked semiconductor laser with an external continuous-wave (CW) signal. With this injection seeding technique, over 8 mW of average power in 30 ps pulses with side cluster suppression of over 20 dB was obtained from an actively modelocked AlGaAs semiconductor laser. This average output power compares favorably with the 12 mW W output power of the extended resonator. The frequency spectrum of the laser is determined by the background noise level as set by the spontaneous emission. Injection seeding overrides the noise and concentrates over 99% of the available energy in a single nearly transform-limited pulse     

高重复率全光纤被动锁模飞秒激光产生研究

报道了高重复频率全光纤被动锁模飞秒激光产生的实验研究,采用全光纤环形腔结构和非线性偏振旋转可饱和吸收被动锁模机理实现了100MHz级掺铒光纤锁模飞秒激光的稳定运转,最高重复频率为99.91MHz,光谱带宽为25nm,中心波长为1570nm,脉宽最短为194fs,实验同时研究了在不同重复频率下的全光纤被动锁模激光器运转动力学特性。研究为高重复频率飞秒光纤激光器在光频梳产生技术中的应用提供了高集成、高稳定超快光源技术途径。     

A broad-band millimeter-wave optical modulator using a passively modelocked semiconductor laser with phase noise compensation

A new and simple technique to produce efficient optical modulation at millimeter-wave frequencies by compensating for the phase noise of a 0.85-/spl mu/m passively modelocked semiconductor laser is presented. The passively modelocked laser is intensity modulated with the electrically mixed product of its phase noise and the millimeter-wave information signal. One of the resulting sidebands to the modelocked note is identical to the millimeter-wave frequency information because of the cancellation of the phase noise of the modelocked signal. A carrier-to-noise ratio (CNR) of 87 dBc/Hz at 41.9 GHz is demonstrated and it is shown that optical modulation at subcarrier frequencies up to 100 GHz and a CNR of 120 dBc/Hz is possible.     

Picosecond pulse generation with 1.5 /spl mu/m passively modelocked surface-emitting semiconductor laser

The authors report the first demonstration of an optically pumped passively modelocked surface-emitting semiconductor laser operating in the 1.5 /spl mu/m region. The modelocked laser emits pulses of 6.5 ps full width at half maximum duration with an average power of 13.5 mW at a fundamental repetition rate of 1.342 GHz. The peak power was 1.6 W.