1064nm与1066nm连续波双波长Nd:YVO4激光器实现

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本文研究了一种新型的连续波（CW）双波长Nd:YVO4激光器，工作在1064纳米和1066纳米这两个光谱区域。该研究成果由北京理工大学 Institute of Laser Engineering 的 Shuaijun Zhou (周帅军)、Peng Gu (谷鹏)、Xiaoli Li (李小丽) 和 Shibing Liu (刘世炳) 团队合作完成，其中李小丽教授是通讯作者，电子邮箱为 lilyli@bjut.edu.cn。这项工作于2017年1月20日收到初步提交，3月24日接受并最终于4月10日在线发布。研究的核心技术是利用Nd:YVO4晶体的角度调谐方法，通过精确控制两个不同波长（1064和1066纳米）的受激发射交叉截面比例，实现了单一激光器同时输出双波长的工作。这种设计的关键在于实现高效而稳定的双波长同步，这对于激光器的实际应用具有重要意义。实验结果显示，在2.85瓦的泵浦功率下，1064纳米和1066纳米的输出功率分别达到了0.55瓦和0.54瓦，显示出较高的能量转换效率。这种激光器的特点在于其共振腔长度仅为10毫米，这使得它具备了小型化和低阈值的优点。对于基于差频产生技术的紧凑型太赫兹源的发展来说，这种双波长激光器具有极大的吸引力。论文的光学科学分类代码包括140.3580（固态激光器）和1403615（多功能激光系统），表明这项研究属于固体激光器领域，并着重于多功能激光器的设计与优化。这项研究不仅展示了Nd:YVO4材料在双波长激光器中的潜力，也为开发高效、紧凑的太赫兹辐射源提供了新的可能性，对光子学和激光技术的发展有着积极的影响。

Continuous wave dual-wavelength Nd:YVO

laser working at 1064 and 1066 nm

Shuaijun Zhou (周帅军), Peng Gu (谷鹏), Xiaoli Li (李小丽)*, and Shibing Liu (刘世炳)

Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China

*Corresponding author: lilyli@bjut.edu.cn

Received January 20, 2017; accepted March 24, 2017; posted online April 10, 2017

We demonstrate a continuous-wave (CW) dual-wavelength Nd:YVO

laser working at 1064 and 1066 nm si-

multaneously. The method of Nd:YVO

crystal angle tuning is used to balance the ratio of the stimulated emis-

sion cross sections of the two wavelengths, leading to the realization of a simultaneous dual-wavelength

operation from only one laser. The experimental results show that at a 2.85 W pump power, the maximum

output powers at wavelengths of 1064 and 1066 nm are 0.55 and 0.54 W, respectively. The linear resonate cavity

is as short as 10 mm, which gives the laser the advantages of a miniature configuration and low threshold. Such a

dual-wavelength laser can be very attractive for the development of compact THz sources based on difference

frequency generation.

OCIS codes: 140.3580, 1403615, 1403600.

doi: 10.3788/COL201715.071401.

The generation of terahertz (THz) radiation has gained

rising interest due to its potential to be widely used in

medicine, biology, homeland security, and other applica-

tions

[1–4]

. However, the uptake of THz technologies is ham-

pered by a lack of powerful and cost-effective sources. In

the past decade, there has been a large amount of activities

focusing on the development of compact THz laser

sources. One of the most practical and efficient methods

is based on optical frequency mixing within conventional

Nd lasers. The employed nonlinear conversion processes

include difference frequency generation (DFG), optical

parametric oscillation (OPO), and stimulated polariton

scattering (SPS)

[1,3,5]

. In this Letter, we are concerned with

simultaneous dual-wavelength operation in an Nd laser

used for the DFG method.

To reach simultaneous dual-wavelength emission from

only one Nd laser, three main frequency controlling routes

have been utilized. The first one stimulates two transitions

from different energy levels in a laser crystal to generate

dual-wavelength emissions with a relatively large fre-

quency separation on the scale of 10 THz, such as 1.06

and 1.3 μm

[6]

. The second one focuses on one transition

with Stark splitting of involved energy levels, which can

generate dual-wavelength emissions with a relatively

small frequency separation on the scale of 0.1 THz, such

as 1063 and 1066 nm

[7]

. The third one stimulates a

fundamental wavelength and then shifts it to another

wavelength by some nonlinear process, such as stimulated

Raman scattering

[8]

and SPS

[1,3]

, which can generate dual-

wavelength emission with a several THz frequency sepa-

ration. In 2011, Sirotkin et al.

[9]

reported continuous-wave

(CW) tuning of a c-cut Nd:YVO

laser from 1062 to

1067 nm, and radiation at 1062 and 1066 nm was also ob-

tained. Zhao et al.

[10]

reported a THz source with orthogo-

nal linearly polarized lasers at 1047 and 1053 nm by using

an Nd:YLF crystal as the active gain medium. In 2013,

control of laser emissions by selecting crystal orientations

was used to get emission wavelengths in the range of 1061

to 1068 nm

[11]

. Reference [12] realized an Nd:YLF laser at a

cryogenic temperature with orthogonally polarized simul-

taneous emission at 1047 and 1053 nm. More recently,

Brenier

[13]

equalized the emission cross sections at 1047

and 1053 nm by adjusting the propagation direction

out of the principal axes. Lin et al.

[14]

employed a simple

glass etalon to modulate the intra-cavity losses to achieve

multi-wavelength linearly polarized Nd:YVO

lasers at

1062, 1064, and 1066 nm. According to the reported

experimental results

[15–19]

, the stability of the output

power and the conversion efficiency of the above dual-

wavelength lasers need to be improved by a special cavity

design, advanced mirror coating, or by using additional

optical elements, such as an intracavity etalon and a

polarization beam splitter. Those with orthogonal linearly

polarized laser

[9–14]

outputs could be very interesting, but

their applications have been limited by relatively complex

laser configurations, extreme temperature conditions, and

additional losses.

In this Letter, we choose an Nd:YVO

crystal to build a

diode-end-pumped CW dual-wavelength laser running

at 1064 and 1066 nm simultaneously, with the considera-

tion of ideal optical and physical characteristics of

the Nd:YVO

crystal for a multi-wavelength laser

operation

[14,20,21]

. In our experiments, the optimum oscilla-

tion condition for the dual-wavelength operation was

achieved by tuning the angle between the c-axis of

Nd:YVO

crystal and the polarization direction of the

pump light. The maximum output powers at a 2.85 W

pump power were 0.55 and 0.54 W at wavelengths of

1064 and 1066 nm, respectively. The linear and short laser

cavities brought our dual-wavelength laser obvious advan-

tages of compact configuration and low threshold, which

are attractive for practical THz sources based on DFG.

COL 15(7), 071401(2017) CHINESE OPTICS LETTERS July 10, 2017

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