1.0μm高功率电光调QNd:ScYSiO5晶体与三波长1.3μm激光研究

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本文主要探讨了基于Nd:ScYSiO5晶体的高性能1.0微米电光调制Q开关激光器和三波长1.3微米激光器的操作研究。Nd:ScYSiO是一种常用的掺杂材料，因其在光纤激光器中的优异性能而受到关注。作者团队，由王强国、崔娜、姚勇平等研究人员组成，他们来自山东科技大学的电气工程与自动化学院和电子与信息工程学院。研究的核心是利用铷钛酸铅（RTP）电光开关器以及偏振分束器，实现了对1.0微米波段激光的高效控制。通过优化设计，他们成功地实现了1.0微米激光的高信号噪声比，获得了脉冲宽度仅为30纳米的超短脉冲，最大脉冲能量达到了0.765毫焦耳，峰值功率更是达到了惊人的25.5千瓦，这表明了该激光器在高功率输出方面的卓越性能。在1.3微米波段，研究者们同时进行了多波长操作，这在光通信和光谱分析等领域具有重要的应用潜力，如光纤通信系统中的多波长传输，或在光谱测量设备中实现更宽范围的光谱覆盖。通过这种方式，Nd:ScYSiO5晶体展现出了其在不同波长区域的多功能性和灵活性。文章的作者还强调了实验结果的时间线，指出这项研究于2019年5月15日接收，6月20日被接受，并于同年9月2日在线发布。这种高水平的研究成果不仅反映了作者团队在激光技术领域的深厚积累，也为后续在高功率、多功能激光器研发上提供了有价值的参考。这项工作对于推动高功率、多波长激光技术的发展，特别是在光通信和精密测量领域，具有重要的科学价值和实际应用前景。同时，它也展示了在Nd:ScYSiO5基材上进行深入研究的潜力，预示着未来可能在更高性能的光子器件设计中取得突破。

High peak power 1.0 μm and tri-wavelength 1.3 μm

Nd:ScYSiO

crystal lasers

Qiangguo Wang (王强国)

, Na Cui (崔娜)

, Yongping Yao (姚勇平)

Lihua Meng (孟丽华)

, Lei Li (李磊)

, Lulu Dong (董璐璐)

1,2

, Huiyun Zhang (张会云)

Shande Liu (刘善德)

1,2,

*, and Dehua Li (李德华)

College of Electrical Engineering and Automation, Shandong University of Science and Technology,

Qingdao 266590, China

College of Electronic and Information Engineering, Shandong University of Science and Technology,

Qingdao 266590, China

*Corresponding author: pepsl_liu@163.com; **corresponding author: jcbwl@sdust.edu.cn

Received May 15, 2019; accepted June 20, 2019; posted online September 2, 2019

With a Nd:ScYSiO

crystal, a high peak power electro-optically Q-switched 1.0 μm laser and tri-wavelength laser

operations at the 1.3 μm band are both investigated. With a rubidium titanyle phosphate (RTP) electro-optical

switcher and a polarization beam splitter, a high signal-to-noise ratio 1.0 μm laser is obtained, generating a

shortest pulse width of 30 ns, a highest pulse energy of 0.765 mJ, and a maximum peak power of 25.5 kW,

respectively. The laser mode at the highest laser energy level is the TEM

mode with the M

value in the

X and Y directions to be M

= 1.52 and M

= 1.54. A tri-wavelength Nd:ScYSiO

crystal laser at 1.3 μmis

also investigated. A maximum tri-wavelength output power is 1.03 W under the absorbed pump power of

7 W, corresponding to a slope efficiency of 14.8%. The properties of the output wavelength are fully studied

under different absorbed pump power.

OCIS codes: 140.3380, 140.3540.

doi: 10.3788/COL201917.111403.

Due to excellent physicochemical and mechanical proper-

ties, oxyorthosilicate crystals have attracted great atten-

tion in the high peak power laser application. Moreover,

oxyorthosilicate crystals possess a broad bandwidth result-

ing from the applications in tunable and ultrafast lasers. So

far, the oxyorthosilicate crystals doped with different rare

earth (RE) ions including Nd

3þ

[1,2]

,Yb

3þ

[3–5]

,Er

3þ

[6,7]

3þ

[8,9]

,andHo

3þ

[10,11]

have been well grown and applied

in laser devices. In addition, as a solid solution of Sc

SiO

and Y

SiO

, the application values of the ScYSiO

crystal

have been demonstrated by many research groups

[12,13]

.Due

to different substitutional sites of positive ions, disordered

crystals exhibit an excellent energy storage capacity and

potential application in ultrafast lasers. For example, a

Nd-doped ScYSiO

crystal has a smaller emission cross

section of 1 × 10

−19

for

3∕2

→

11∕2

transition

[14]

and

the room-temperature fluorescence lifetime was measured

to be 240 μs

[15]

. Compared with Nd:YAG and Nd∶YVO

crystals, the lower emission cross section and shorter fluo-

rescence lifetime of the Nd∶ScYSiO

crystal imply a higher

pump threshold. Nevertheless, it has a better energy

storage ability and Q-switching performance. A passively

Q-switched Nd∶ScYSiO

laser operating at 1.07 μm was re-

ported in 2012

[12]

, however, the output peak power was lim-

ited to be 0.7 kW. Compared with passive Q-switching

technology using Cr

-doped crystals or 2D materials as

a saturable absorber

[16–19]

, an electro-optical Q-switcher is

a good selection to obtain a stable and high signal-to-noise

ratio laser pulse. Thus, it is worth studying high peak power

output characteristics of the Nd∶ScYSiO

laser based on an

electro-optical Q-switcher. Furthermore, less Nd:ScYSiO

laser research in the 1.3 μm band has been done. A high

peak power 1.3 μmNd∶ScYSiO

laser was realized when

pumped by a pulsed laser diode (LD)

[15]

.However,theout-

put properties, especially multiwavelength properties, need

to be further investigated.

In this Letter, a high peak power, high signal-

to-noise ratio electro-optically Q-switched Nd∶ScYSiO

laser at 1.0 μm and a tri-wavelength Nd∶ScYSiO

laser

at 1.3 μm band are both demonstrated. The highest pulse

energy, maximum peak power, and shortest pulse width

are 0.765 mJ, 25.5 kW, and 30 ns, respectively. The laser

mode at the highest laser energy level is the TEM

mode,

with an M

value of M

¼ 1.52 and M

¼ 1.54. What is

more, the 1.3 μm continuous-wave (CW) tri-wavelength

Nd∶ScYSiO

laser is also researched. The maximum tri-

wavelength average output power is 1.03 W which is

achieved under the absorbed pump power of 7 W, corre-

sponding to a slope efficiency of 14.8%.

The experimental setups of the 1.0 μ m electro-optically

Q-switched laser and 1.3 μmCWNd∶ScYSiO

laser

are shown in Figs.

1(a) and 1(b), respectively. A fiber-

coupled 808 nm LD with a core diameter of 400 μm

and a numerical aperture (NA) of 0.22 was applied as a

pump source for both laser operations. The pump beam

was coupled into the laser crystal, giving a pump waist

of about 400 μm. An uncoated Nd∶ScYSi O

crystal with

dimensions of 3 mm × 3 mm × 8 mm and a Nd

3þ

-doped

concentration of 0.8 at.%. was employed as the gain

medium, and the absorption efficiency of the Nd∶ScYSiO

COL 17(11), 111403(2019) CHINESE OPTICS LETTERS November 2019

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