1.33微米高效率Nd:LaGGG激光器的连续波与被动Q开关性能

42 浏览量更新于2024-08-30 收藏 578KB PDF 举报

本文报道了一项重要的研究成果，即在1.33微米波段实现了高效率的Nd:(LaxGd1-x)3Gd5O12（Nd:LaGGG）激光器的连续波(CW)和被动式Q开关(PQS)操作。这是据作者所知，首次在这个特定波长范围内取得这样的性能。研究人员来自山东大学的晶体材料国家重点实验室以及教育部功能性晶体材料与器件重点实验室，还与意大利比萨大学的NEST-CNR和物理系合作。在连续波运行模式下，通过二极管泵浦，该激光器的最大输出功率达到了5.1瓦，显示出出色的光学光转换效率，达到了25.3%，这表明能量转换过程相当高效。此外，其斜率效率达到了26.6%，这是衡量激光器能效的重要指标，意味着系统能够在单位时间内将更多的电能转化为光能。在被动式Q开关操作中，研究者采用了V3+:YAG晶体作为饱和吸收器，进一步提升了激光器的性能。这一配置使得激光器能够实现最高平均输出功率、最短脉宽、最大脉冲能量以及最高的峰值功率。这些参数的优化表明了该激光器在脉冲模式下的强大能量输出能力，对于许多应用，如材料处理、医疗手术或光纤通信等，都具有显著的优势。这项工作对于推动1.33微米波段激光技术的发展具有重要意义，它不仅展示了Nd:LaGGG作为一种潜在高性能激光介质的可能性，也为相关领域的研究人员提供了新的设计思路和实验平台。同时，对于激光器制造商而言，这种高效率和多功能性可能带来商业上的竞争优势。未来的研究可能会探索如何进一步提升激光器的稳定性、可调谐性和可靠性，以满足不同应用场景的需求。

Highly efficient Nd:(La

1−x

)

laser operation

at 1.33 μm

Zhitai Jia (贾志泰)

1,2

, Yanru Yin (尹延如)

, He Yang (杨合)

, Baitao Zhang (张百涛)

Jingliang He (何京良)

1,2

, Mauro Tonelli

, and Xutang Tao (陶绪堂)

1,2,

State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

Key Laboratory of Functional Crystal Materials and Device (Shandong University, Ministry of Education),

Jinan 250100, China

NEST-CNR and Dipartimento di Fisica, Università di Pisa, Largo Pontecorvo 3, 56127 Pisa, Italy

*Corresponding author: txt@sdu.edu.cn

Received October 12, 2015; accepted November 26, 2015; posted online January 26, 2016

The continuous wave (CW) and passively Q-switched (PQS) performances of diode-pumped

Nd:ðLa

1−x

(Nd:LaGGG) at 1.33 μm are achieved for the first time to our knowledge. The maximum

CW output power of 5.1 W is obtained with the optical-optical conversion efficiency of 25.3% and the slope

efficiency of 26.6%. In the PQS operation, by using the V

3þ

:YAG crystal as the saturable absorber, the maxi-

mum average output power, shortest pulse width, largest pulse energy, and highest peak power are measured to

be 1.1 W, 27.54 ns, 75.78 μJ, and 2.44 kW, respectively.

OCIS codes: 140.3530, 320.5550.

doi: 10.3788/COL201614.021405.

Diode-pumped solid-state lasers possess the merits of com-

pactness, high efficiency, reliability, and good beam qual-

ity that have enabled them to have extensive applications

in industry, medicine, and scientific studies

[1]

. Consider-

able efforts have been devoted to search for good solid-

state gain media in which Nd:Gd

(Nd:GGG)

has been proved to be an excellent candidate for laser ap-

plications owing to its good mechanical properties, large

thermal conductivity, and high damage threshold

[2,3]

.As

an isomorph of GGG crystal, a Nd:LaGGG crystal with

aNd

3þ

doping level of 1 at. % and a La

3þ

concentration

of 1.6 at. % has been grown by the Cz method

[4]

. In com-

parison with the Nd:GGG crystal, the Nd:LaGGG crystal

should have a lower melting temperature and a higher

3þ

segregation coefficient owing to the larger radius

of La

3þ

ions than that of Gd

3þ

ions

[5]

, which would benefit

the crystal growth. Furthermore, the Nd:LaGGG crystal

can possess wider inhomogeneous broadened spectra than

that of Nd:GGG crystal because of the multicenter distri-

bution of Nd

3þ

ions and more complex structure of the

host material

[4]

, which would be favorable for mode-

locking operation. The crystal growth, the thermal and

spectral properties, as well as the laser properties at

1062 nm of Nd:LaGGG crystal have been investigated

[4,6]

However, to our knowledge, no work on 1.3 μm

Nd:LaGGG lasers has been reported yet.

The continuous wave (CW) and passively Q-switched

(PQS) laser properties of some Nd-doped gallium-based

garnets at 1.3 μm have been widely studied, as shown

in Table

[7–12]

, in which the Nd:LGGG crystal doped with

0.66 at. % Lu

3þ

ions owns the highest output power on

CW (3.7 W) and PQS (0.75 W) operation. Concerni ng

the saturable absorber applied in this work, we selected

the V

3þ

:YAG crystal because it has good physical and

optical performance around 1.3 μm in comparison with

the co-doped crystals and the semiconductor saturable

absorber mirror (SESAM)

[9]

In this Letter, we report CW and PQS laser operations

at 1.33 μm with the Nd:LaGGG crystal. Under the ab-

sorbed pump power of 20.16 W, the highest CW output

power of 5.1 W was achieved with the optical-optical con-

version efficiency of 25.3% and the slope efficiency of 26.6%.

By using V

3þ

:YAG crystal as the saturable absorber, we

demonstrated the PQS Nd:LaGGG laser with the maxi-

mum average output power of 1.1 W.

The experimental arrangement of the diode-pumped

Q-switched Nd:LaGGG crystal at 1.33 μm is shown sche-

matically in Fig.

1. The pump source was a fiber-coupled

808 nm diode laser with a core diameter of 0.6 mm and

numerical aperture of 0.22. Its radiation was coupled

into the laser crystal by a focusing optical system with a

25 mm focal length and a ratio of 1∶1. The Nd:LaGGG

crystal was cut along the h111i direction with dimensions

of 4×4×8ðmmÞ. It was wrapped with indium foil and

mounted in copped block cooled by water at a temperature

of 20°C. The input concave mirror M1 with the radius of

curvature 800 mm was antireflection (AR) coated at

808 nm on the plane side, high reflection (HR, R > 99.8%)

at 1330 nm, and high transmission (HT, T > 95%)at

808 nm on the concave side. The output mirror M2 had

a coating with different transmissions (T

¼ 3%,8%,

and 15%) at 1330 nm and HT at 1062 nm to suppress

the oscillation of 1.06 μm laser. The V

3þ

:YAG saturable

absorber with the dimensions of 3 × 3 × 2.83 ðmmÞ was

placed next to output mirror M2 to realize the Q-switching

operation. Its initial transmission at 1.3 μm was measured

to be about 95%. The CW and PQS laser output power was

detected by the laser power meter (Fieldmax II, coherent).

COL 14(2), 021405(2016) CHINESE OPTICS LETTERS February 10, 2016

下载后可阅读完整内容，剩余3页未读，立即下载

粉丝:
资源:

1.33微米高效率Nd:LaGGG激光器的连续波与被动Q开关性能

Highly efficient Nd:YAG ceramic CW laser with 59.8% slope-efficiency

Highly effcient Nd:YAG/LBO laser at 473 nm under direct 885-nm diode laser pumping

Highly efficient cascaded P-doped Raman fiber laser pumped by Nd:YVO3 solid-state laser

Highly efficient continuous-wave laser operation of laser diode-pumped Nd,Y:CaF2 crystals

Highly efficient CW laser operation in 4 at. % Tm3+ and 4 at. % Y3+ codoped CaF2 crystals

Ultra-broadband highly efficient mode converter at 1 μm fabricated by a line-focused CO

Continuous-wave laser operation of diode-pumped Nd:YVO4/YVO4 composite crystal

论文研究-Generation of highly efficient, nanosecond Ince-Gaussian beams in Cr,Nd:YAG microchip lasers.pdf

Highly efficient mid-infrared 2μm emission in Ho3+/Yb3+-codopedgermanate glass

High power CW and Q-switched operation of a diode-side-pumped Nd:YAG 1319-nm laser

最新资源