1.07um紧凑型Nd:GYSO激光器：无源调Q与高功率连续波性能

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本文报道了一种新型的紧凑型设计，利用二极管泵浦技术实现的连续波（CW）和无源调Q（Passive Q-switched）Nd:GYSO激光器，工作波长位于1.07微米区域。这项研究着重于在小型化和高效能方面取得突破，通过采用双镜线性腔结构来优化激光器的设计。首先，研究人员针对Nd:GYSO（钕掺杂格子硅酸氧钇晶体）这种常见的光纤激光材料进行了深入研究。Nd:GYSO因其高效率的光放大能力，常用于各种高功率应用中，包括通信、工业切割和医疗领域。然而，实现高功率输出的同时保持紧凑的设备尺寸是一项挑战，特别是在无源调Q技术的应用上，它依赖于非线性介质来限制脉冲输出的频率宽度，从而获得更高的平均功率。文章的核心部分介绍了采用MoS2（二硫化钼）作为可饱和吸收器的策略。MoS2是一种新型的非线性光学材料，其独特的光吸收特性有助于有效地控制光脉冲的强度和时长，使得在紧凑的腔体中实现无源Q开关成为可能。这种材料的选择不仅提高了调制效率，而且减少了对额外光学元件的需求，进一步简化了系统设计。研究者们详细描述了激光器的制作过程，包括激光器腔体的构建，二极管泵浦源的选择和配置，以及如何通过优化参数如泵浦功率、腔体长度和MoS2吸收层厚度来优化激光器性能。他们还记录了实验结果，包括激光器的输出功率、脉宽、调制频率等关键参数，展示了其在实际应用中的潜力。文章历史显示，这项研究经历了从最初的接收稿到修改后的最终接受，跨度约两个月。关键词“Nd:GYSO disorder crystal”，“Passive Q-switching”，和“MoS2 saturable absorber”强调了研究的核心技术和创新点。这篇研究论文对于那些关注高功率、紧凑型激光器设计以及新型非线性光学材料应用的科研人员具有很高的参考价值，为优化未来基于Nd:GYSO的短波段激光器性能提供了一种创新的途径。

Full length article

Compact diode-pumped continuous-wave and passively Q-switched

Nd:GYSO laser at 1.07 mm

Zhi Lin

, Xiaoxu Huang

, Jinglong Lan

, Shengwei Cui

, Yi Wang

, Bin Xu

Zhengqian Luo

, Huiying Xu

, Zhiping Cai

, Xiaodong Xu

, Xiaoyan Zhang

, Jun Wang

Jun Xu

Department of Electronic Engineering, Xiamen University, Xiamen 361005, China

Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116,

China

Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

School of Physics Science and Engineering, Institute for Advanced Study, Tongji University, Shanghai 200092, China

article info

Article history:

Received 7 December 2015

Received in revised form

14 February 2016

Accepted 22 February 2016

Keywords:

Nd:GYSO disorder crystal

Passive Q-switching

MoS

saturable absorber

abstract

We report diode-pumped continuous-wave (CW) and Q-switched Nd:GYSO lasers using a compact two-

mirror linear laser cavity. Single-wavelength laser emissions at 1074.11 nm with 4.1-W power and at

1058.27 nm with 1.47-W power have been obtained in CW mode. The slope efﬁciencies with respect to

the absorbed pump powers are 4 8.5% and 22.9%, respectively. Wavelength tunability is also demon-

strated with range of about 8 nm. Using a MoS

saturable absorber, maximum average output power up

to 410 mW at 1074 nm can be yielded with absorbed pump power 6.41 W and the maximum pulse

energy reaches 1.20

J with pulse repetition rate of 342.5 kHz and shortest pulse width of 810 ns. The

CW laser results represent the best laser performance and the Q-switching also present the highest

output power for Q-switched Nd

3þ

lasers with MoS

as saturable absorber.

1. Introduction

During the past decades, various Nd

3 þ

lasers producing laser

emissions at near infrared spectral domains (0.9, 1.06, 1.1, 1.3 and

1.4 mm) and doped into different host materials of the Nd

3 þ

ion

have been greatly developed because these Nd

3 þ

lasers have

various important applications. For instance, as one of the most

important application, by nonlinear frequency conversion (mainly

second-harmonic generation and sum-frequency mixing) with the

aid of nonlinear crystals, these Nd

3 þ

infrared lasers can be efﬁ-

ciently wavelength converted to visible lasers at blue [1,2], green

[3], yellow [4], orange [5] and red [6].

Compared with those conventional Nd

3 þ

single crystal laser

materials, such as Nd:YAG [7 9], Nd:GGG [10 ,11], Nd:YVO

[12,13], Nd:GdVO

[14], Nd:YLF [15,16], and Nd:YAP [17,18],in

recent years, laser host materials possessing broad bandwidth

have attracted more and more research interest because these

broad bandwidth laser materials provides opportunity to pursue

ultrashort pulse lasers. According to Ref. [19], such broad band-

width resulting from an inhomogeneous broadening behavior is

attributed to the multiple substitutional sites with low symmetry

enhancing the structural disorder to a certain extent. Among dis-

order laser materials, GYSO showing a combined beneﬁts of the

energy splitting from GSO with the more rigid and isotropic

structure of YSO gains more and more attention [19]. In fact, in

recent years, laser operation of Yb

3 þ

-doped GYSO material has

been explored thoroughly [20-22]. However, so far, research on

CW Nd:GYSO laser is still very limited. Li et al. [19] reported a

maximum 1.54 W laser output with slope efﬁciency of about 27.4%

at 1074 nm. Feng et al. [23] improved the output power and slope

efﬁciency to 3.5 W and 31.8%, respectively. However, the laser

emission was still limited to around the 1074 nm line. Laser

emissions at other lines and the characteristic of wavelength

tuning beneﬁting from the broad ﬂuorescence of Nd:GYSO crystal

have not yet been reported to date.

On the other hand, during the past decade, various 2D na-

nosheet materials have been developed to act as saturable absor-

bers (SAs) for Q-switching and mode locking in the ﬁelds of solid-

state lasers and ﬁber lasers. These 2D SA materials, such as gra-

phene [24,25], topological insulator [15,26], MoS

[27-29] and

recently created black phosphorus [30], are more and more pop-

ular because of their ultra-broadband saturable absorption, low

cost and easy fabrication. All these properties lead to such kind of

2D nanosheet materials suitable for mass production not only in

Contents lists available at ScienceDirect

journal homepage: www.elsevier.com/locate/optlastec

Optics & Laser Technology

http://dx.doi.org/10.1016/j.optlastec.2016.02.017

Corresponding authors.

E-mail addresses: xubin@xmu.edu.cn (B. Xu), Xdxu79@mail.sic.ac.cn (X. Xu).

Optics & Laser Technology 82 (2016) 82–86

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