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提出双环掺铒光纤激光器耦合反馈控制混沌的物理模型,利用定向耦合器将系统的输出变量反馈到系统中,通过间接控制损耗系数,并选取适当的反馈系数,实现对系统混沌的控制。分析了反馈系数对激光器由混沌态进入周期态和稳定态的动力学行为的影响。数值模拟表明:改变系统损耗系数,双环掺铒光纤激光器可由周期态进入混沌态;加入耦合反馈,适当调制反馈系数,可以将双环光纤激光器混沌控制到周期态和稳定态上;提高系统反馈系数,系统进入稳定态的时间变短。选取不同的系统初值,激光器总能得到两种不同的奇怪吸引子,可见双环掺铒光纤激光器具有双稳态特征。 相似文献
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Yb:Er共掺杂对掺铒光纤激光器中自脉冲行为的抑制作用 总被引:3,自引:0,他引:3
为了进一步提高镱铒共掺杂光纤激光器的实用性,对镱铒掺杂光纤激光器的自脉冲现象进行了理论分析。利用掺杂光纤中铒离子对的可饱和吸收的作用而引起自脉冲运转及离子对互作用模型作为理论基础建立系统模型,通过理论计算分析了共掺杂镱后掺铒光纤的有效抽运速率,证明了镱铒共掺杂可以提高有效抽运速率。使用这种光纤,可以使抑制光纤激光器中离子对导致的自脉冲效应所需的抽运功率水平大大降低。半导体激光器输出的抽运功率足以抑制由离子对导致的自脉冲,提供稳定激光运转。在研制稳定单频或高重复频率锁模光纤激光器方面,这种可用激光二极管抽运的镱铒共掺光纤具有很大的潜力。 相似文献
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为了进一步提高镱铒共掺杂光纤激光器的实用性 ,对镱铒掺杂光纤激光器的自脉冲现象进行了理论分析。利用掺杂光纤中铒离子对的可饱和吸收的作用而引起自脉冲运转及离子对互作用模型作为理论基础建立系统模型 ,通过理论计算分析了共掺杂镱后掺铒光纤的有效抽运速率 ,证明了镱铒共掺杂可以提高有效抽运速率。使用这种光纤 ,可以使抑制光纤激光器中离子对导致的自脉冲效应所需的抽运功率水平大大降低。半导体激光器输出的抽运功率足以抑制由离子对导致的自脉冲 ,提供稳定激光运转。在研制稳定单频或高重复频率锁模光纤激光器方面 ,这种可用激光二极管抽运的镱铒共掺光纤具有很大的潜力。 相似文献
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基于单模双环掺铒光纤激光器混沌反馈相移控制方法和物理模型,分别对两种单环反馈相移的物理模型作了讨论。利用耦合器将系统的输出量反馈到系统中,选取适当的反馈系数,并在反馈通道上加入相移控制器控制反馈光的相移,通过对反馈系数和反馈光相移的控制可以有效地控制激光输出的混沌态、稳定态和周期态。在此基础上,对激光器双环反馈相移控制方法作了详细分析,研究了反馈系数和反馈相移对单模双环掺铒光纤激光器激光混沌双环反馈相移控制模型的影响,并得到一定的规律。 相似文献
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对掺饵光激光器的自脉冲行为进行了研究。采用半导体激光器连续光泵浦,在较低的泵浦功率下,在掺饵光纤激光器中得到了稳定的1倍周期和2倍周期自脉冲输出,观察到周期性的不等幅脉冲序列输出,在理论上动用光子寿命可变的正交偏振激光场耦合模型对实验进行了分析。结果表明,掺饵光纤激光器中两正交偏振模光子寿命的调节对获得稳定的自脉冲有着十分重要的作用。 相似文献
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提出了一种实现全光纤中红外激光器脉冲运转的方法。利用氟化物玻璃中镝离子(Dy3+)的2.8μm波段的吸收截面与铒离子(Er3+)发射截面重合的特性,将掺镝氟化物光纤作为中红外波段的可饱和吸收体,实现2.8μm掺铒氟化物光纤激光器全光纤结构的被动调Q脉冲运转;通过在可饱和吸收体两端引入中心波长为3.1μm的光纤光栅,解决Dy3+上能级寿命较长所导致的高泵浦功率下Dy3+吸收饱和、进而导致被动调Q失效的问题。基于该结构建立了2.8μm被动调Q掺铒光纤激光器的速率方程模型,计算了可饱和吸收体的参数及其两端的谐振腔反馈条件对2.8μm激光器的脉冲运转功率和时间特性的影响。计算结果表明,通过在可饱和吸收体两端引入光纤光栅可以加快可饱和吸收体的恢复过程,使激光器能够在高泵浦功率下保持调Q脉冲运转。 相似文献
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We inspect the spectral features of a diode-pumped Erbium-doped fiber laser (EDFL) with a Fabry-Perot cavity composed of a wavelength-selective coupler in the form of fiber Bragg grating (FBG) and wavelength-insensitive Faraday rotator mirror (FRM). High accuracy for the spectral measurements is provided with the use of an optical heterodyne scheme where the EDFL output is mixed with radiation from a narrow-line semiconductor laser, allowing the detection of the EDFL spectra with a sub-pm resolution. The heterodyne scheme permits precise measurements of the EDFL line-width as a function of the cavity length and pump power. It is worth noticing a narrow-line (a few pm) operation of the EDFL with a short length (<3 m) cavity and low (<5) excess of pump power over the laser threshold. The spectral response of the EDFL to a slow sinusoidal modulation of a physical length of the FBG coupler is analyzed and it is shown that as high as ∼1-nm modulation of the EDFL optical spectrum is attainable at maximal modulation amplitudes. The narrow-line EDFL with a modulated generation wavelength is hereby demonstrated to be a tool for high-resolution measurements of reflection spectra of FBGs, which is to the best of our knowledge a novel application of the EDFL. 相似文献
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A compact graphene Q-switched erbium-doped fiber laser using optical circulator and tunable fiber Bragg grating
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We demonstrate a passively Q-switched tunable erbium-doped fiber laser(EDFL)based on graphene as a saturable absorber(SA).A three-port optical circulator(OC)and a strain-induced tunable fiber Bragg grating(TFBG)are used as the two end mirrors in an all-fiber linear cavity.The Q-switched EDFL has a low pump threshold of 23.8 mW.The pulse repetition rate of the fiber laser can be widely changed from 9.3 kHz to 69.7 kHz by increasing the pump power from23.8 mW to 219.9 mW.The minimum pulse duration is 1.7μs and the highest pulse energy is 25.4 nJ.The emission wavelength of the laser can be tuned from 1560.43 nm to 1566.27 nm by changing the central wavelength of the straininduced TFBG. 相似文献
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M. V. Gorbunkov Yu. Ya. Maslova V. A. Petukhov M. A. Semenov Yu. V. Shabalin A. V. Vinogradov 《Journal of Russian Laser Research》2014,35(5):492-500
We show numerically and analytically that the technique using a combination of optoelectronic feedback loops allows one to realize new time scale regimes in solid state lasers. In a self mode-locked laser, the combination of negative and positive feedback enables the realization of nonlinear dynamics similar to the logistic map. In quasi-CW mode, the combination leads to a laser output in the form of a square wave with a period of two cavity-round-trip times. The proposed approach paves the way to a regular pulsation with a period of three or four cavity-round-trip times as well. 相似文献
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稳定可调谐的单纵模多环形腔掺铒光纤激光器 总被引:2,自引:1,他引:1
提出了一种多环形腔(MRC)结构的稳定可调的单纵模(SLM)掺铒光纤激光器,多环形腔结构由双环形有源腔和两个次级无源腔组成.这种激光器是利用光纤法布里珀罗可调滤波器(FFP-TF)以及光学光栅滤波器(OGF)两种滤波器和多环形腔结构相结合来共同选模.可实现波长调节范围为1528~1565 nm,在整个波长调节范围内边模抑制比大于44.53 dB,在1554 nm附近边模抑制比可以达到最大值51.18 dB, 输出功率为-8.84 dBm,通过应用多环型腔结构,激光器的输出很稳定,在18 min的观察时间内,中心波长的变化小于0.02 nm,输出功率的变化小于0.04 dBm,实现了稳定且可调谐的单纵模输出. 相似文献
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M. Naruse H. Hori K. Kobayashi T. Kawazoe M. Ohtsu 《Applied physics. B, Lasers and optics》2011,102(4):717-723
We theoretically demonstrate optical pulsation based on optical near-field interactions between quantum nanostructures. It is composed of two quantum dot systems, each of which consists of a combination of smaller and larger quantum dots, so that optical excitation transfer occurs. With an architecture in which the two systems take the role of a timing delay and frequency up-conversion, we observe pulsation in populations pumped by continuous-wave light irradiation. The pulsation is induced with suitable setting of parameters associated with the optical near-field interactions. This will provide critical insights toward the design and implementation of experimental nanophotonic pulse generating devices. 相似文献
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By operating an intracavity semiconductor-optical-amplifier- (SOA-) based high-pass filter at the nearly transparent current condition, the supermode noise (SMN), the relaxation oscillation, and the single-sideband (SSB) phase noise can be simultaneously suppressed in an actively mode-locked erbium-doped fiber laser (EDFL). The SOA at the nearly transparent condition enhances the SMN suppression ratio of the EDFL from 32 to 76 dB at the cost of the phase noise degrading from -114 to -104.2 dBc/Hz and broadening the pulse width from 36 to 61 ps. With an optical bandpass filter, the SSB phase noise and the SMN suppression ratio can be further improved to -110 dBc/Hz and 81 dB, respectively. The EDFL pulse can be further shortened to 3.1 ps with a time-bandwidth product of 0.63 after compression. 相似文献
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N. A. Awang M. Z. Zulkifli S. F. Norizan S. W. Harun Z. A. Ghani H. Ahmad 《Laser Physics》2010,20(10):1894-1898
A simple Erbium Doped Fiber Laser (EDFL) in linear cavity configuration is reported. The cavity design is based on an FBG
as a back reflector, and a loop back optical circulator with an output coupler as the front reflector. Different coupling
ratios of the coupler are tested and 50: 50 provides the highest coupling output power of 22.06 dBm (160.7 mW). The pump power
conversion efficiency is about 95% when pumping with two pump lasers at 1460 and 1490 nm with combined pumping power of 545
mW. The laser output has a measured linewidth of 0.0179 nm. 相似文献
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A unique optical feedback system for coherent optical data processing is described. With the introduction of feedback, the
well-known transfer function for feedback systems is obtained in two dimensions. Operational details of the optical feedback
system are given. Experimental results of system applications in image restoration, contrast control and analog computation
are presented.
Work was performed while the authors were at Carnegie-Mellon University, Pittsburgh, Pa. Portions of this work have been presented
in the 1973 Fall Meeting of the Optical Society of America, Rochester, New York.
Work supported by the National Science Foundation and the National Aeronautic and Space Administration, Goddard Space Flight
Center. 相似文献