Er/Yb共掺双套管光纤激光器实现纳秒级方波脉冲输出

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本文介绍了一种基于"figure-of-eight"腔结构的多波长Er/Yb共掺杂光纤激光器，其特色在于能够产生具有几纳秒脉宽的方形脉冲输出。这种创新设计在激光物理学领域具有重要意义，特别是在光纤传感、光学仪器、微波光子学系统、光学信号处理以及高速光信号传输等方面具有广泛的应用潜力。 Er/Yb共掺杂光纤作为增益介质，利用一个极化保持的双包层光纤段，并通过多模光纤耦合器接受来自工作在975纳米的光纤尾纤激光二极管的泵浦。该激光器能够实现几兆赫兹的重复率，峰值功率高达9.2瓦特，脉冲持续时间约为几纳秒，这在采用非线性偏振开关（NPR）技术时实现了前所未有的长时间方形脉冲特性。 NPR技术的特点是，尽管可以产生长时间的几纳秒脉冲，但其原理涉及非线性偏振变化和激光腔内峰钳效应的共同作用。在激光腔内，几乎线性的脉冲传播会导致脉冲形状变得不规则，形成方形脉冲。这种特性对于某些光纤传感器如多功能传感器应用特别有用，因为几纳秒的脉冲响应时间可以提供更精确的测量和更高的灵敏度。此外，文章还引用了2011年《激光物理学》期刊的一篇文章，注明了ISSN号和出版信息，强调了这一研究的重要性，并声明版权归属于Pleiades Publishing Ltd.和Astro Ltd.。这项研究的结果展示了Er/Yb共掺杂光纤激光器在模式锁定技术上的新进展，为开发更高性能的光子设备提供了新的设计思路和实验基础。总结来说，这篇文章的主要贡献在于研发了一种新型的Er/Yb共掺杂光纤激光器，通过优化的结构和工艺实现了几纳秒脉宽的方形脉冲输出，这对于提升光纤激光器在特定应用中的性能具有显著价值。未来的研究可能围绕如何进一步优化脉冲质量、提高功率或扩大可调谐波长范围来展开。

ISSN 1054660X, Laser Physics, 2011, Vol. 21, No. 10, pp. 1784–1788.

Original Text © Astro, Ltd., 2011.

1784

INTRODUCTION

Pulsed fiber lasers have great applications in the

field of fiberoptic sensing, optical instrumentation,

microwave photonic systems, optical signal process

ing, and high speed optical signal transmission. A great

number of passively modelocking techniques have

been proposed to generate ultrashort pulse operation

[1–10]. Erbiumytterbiumdoped glasses have

received great attention during the last few years.

However, there exists a state of square pulse operation

when using the NPR technique [11–13], in which the

pulse duration can be as long as several nanoseconds.

The principle of the square pulse operation of the fiber

laser had been explained as caused by the nonlinear

polarization switching [11] or the combined action of

the cavityinduced peak clamping effect of the laser

and the almost linear pulse propagation in the laser

cavity [13]. The fiber lasers with the nanosecond

square pulses have potential applications in many fiber

optic sensors, such as in the multiplexed discrete sen

sor configurations and in the distributed temperature

sensing systems, and more importantly in the system

of high power fiber laser when serving as a laser seed.

The comparatively long pulse duration makes the

nanosecond pulse fiber laser feature the capability of

being readily amplified in a fiber amplifier scheme.

With the development of wavelengthdivisionmulti

plexed systems, multiwavelength fiber laser has

attracted considerable attention in the past years. To

date, a lot of methods have been proposed for the gen

eration of the multiwavelength laser oscillation [14–

17]. In the mean time, as the modelocking operation

often offers a wide emission spectrum [18], a multi

wavelength modelocked fiber laser with nanosecond

pulse duration can be further amplified to pump an

The article is published in the original.

optical parametric oscillator for a wide midinfrared

emission.

In this letter, we report, for the first time to our

knowledge, a passively multiwavelength mode

locked square nanosecond pulsed Er/Yb codoped

fiber laser based on a “figureofeight” cavity structure

which is different from the other Er/Yb codoped fiber

laser [19, 20]. By using a high power multimode laser

diode as the pump source, stable comb shaped wide

emission spectrum ranging from 1590 to 1630 nm was

obtained when using the normal transmission fiber in

the figure of eight cavity to compensate the cavity dis

persion. This comb shaped wide spectrum emission

changed to smooth wide spectrum of about 90 nm

ranging from 1550 to 1640 nm when substituting the

dispersion shifted fiber for the normal transmission

fiber. High average power output up to 134.6 mW was

obtained from the modelocked fiber laser with a rep

etition rate of several megahertz, which as a seeding

source can be further amplified in a fiber amplifier for

high power level wide spectral emission output [21].

EXPERIMENTAL SETUP

The setup of the modelocked Er/Yb codoped fiber

laser with nanosecond square pulse output is shown in

Fig. 1. The 2

2 3dB coupler and the loop on the right

side of the figure formed a nonlinear amplifying loop

mirror (NALM). The NALM consisted of a piece of

polarizationmaintaining (PM) Er/Yb codoped dou

bleclad fiber (with core and inner clad diameters of

12/130

m, core and cladding numerical apertures of

0.2/0.46, respectively, and length of 5 m from Nufern),

90 m normal communication transmission fiber

(SMF28 fiber), a polarization controller (PC) and a

(2 + 1)

1 multimode fiber combiner. The Er/Yb co

doped double clad fiber was pumped through the com

biner by a multimode fiber pigtailed laser diode with

FIBER

OPTICS

MultiWavelength ModeLocked Er/Yb CoDoped Fiber Laser

with Square NanoSecond Pulse Output

W. Ye*, J. Wang, T. Chen, and Y. H. Shen

State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering,

Zhejiang University, Hangzhou, 310027 China

*email: hollowfiber.ye@yahoo.com.cn

Received March 19, 2011; in final form, March 27, 2011; published online August 3, 2011

Abstract

—We report a multiwavelength modelocked Er/Yb codoped fiber laser with square nanosecond

pulse output, which is constructed with a “figureofeight” cavity structure. A section of polarizationmain

taining Er/Yb codoped double clad fiber was used as the gain medium and pumped by a fiber pigtailed mul

timode laser diode working at 975 nm via a multimode fiber combiner. Several megahertz repetition rate out

put pulses with peak power up to 9.2 W and pulse duration around several nanoseconds were obtained.

DOI:

10.1134/S1054660X11170294

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Er/Yb共掺双套管光纤激光器实现纳秒级方波脉冲输出

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