首例电泵电光腔 dumped Tm:YAP 激光器：1996.9纳米输出功率与效率研究

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本文主要介绍了首次报道的一种新型的激光技术——基于二极管泵浦的电光腔输出光纤激光器（Diode-pumped Electro-Optical Cavity-Dumped Tm:YAP Laser）。Tm:YAP（铥掺杂石榴石）是一种常用的掺杂材料，其在长波段的性能使其在特定应用中具有吸引力。该研究的重点是将这种激光器的工作波长调整到1996.9纳米，这是一个较为罕见但具有潜在重要应用的波段。研究人员在哈尔滨工业大学的可调谐激光技术国家重点实验室实现了这一创新。他们通过采用高效的二极管泵浦技术，成功地将脉冲宽度控制在了7.1纳秒，这对于激光器的快速响应和高精度操作至关重要。当泵浦功率达到58.8瓦，以100千赫兹的重复率工作，且高电压时间设置为1000纳秒时，该激光器的最大输出功率达到了3.02瓦，这表明整体的光学到光学转换效率达到了5.2%。这个效率水平对于许多应用来说是相当高的，特别是考虑到其工作波长的独特性。文章还探讨了重复率和高电压时间对激光器输出功率特性的影响。通过实验研究，作者揭示了这些参数如何影响激光器的性能，这对于优化系统设计和提高激光器的稳定性具有重要意义。此外，由于该激光器工作在1996.9纳米的波段，它可能被用于眼安全的全固态激光器，在医疗、遥感以及材料处理等领域有着潜在的应用前景，特别是在那些对长波段光源需求较高的行业。这项研究不仅展示了电光腔输出光纤激光器的新实现方式，还为理解其性能与操作参数之间的关系提供了有价值的数据，对于推动长波段激光技术的发展具有积极的推动作用。

Diode-pumped electro-optical cavity-dumped

Tm:YAP laser at 1996.9 nm

Baoquan Yao (姚宝权), Xiaolei Li (李晓磊), Hongwei Shi (时红卫), Tongyu Dai (戴通宇)*,

Zheng Cui (崔铮), Chuanpeng Qian (钱传鹏), Youlun Ju (鞠有伦),

and Yuezhu Wang (王月珠)

National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, Chi na

*Corresponding author: daitongyu2006@126.com

Received July 2, 2015; accepted August 19, 2015; posted online October 5, 2015

In this Letter, we demonstrate a diode-pumped electro-optical cavity-dumped Tm:YAP laser for the first time to

our knowledge. A pulse width of 7.1 ns is achieved at a wavelength of 1996.9 nm. A maximum output power of

3.02 W is obtained with a pump power of 58.8 W at a repetition rate of 100 kHz and a high-voltage time of

1000 ns, corresponding to an overall optical-to-optical conversion efficiency of 5.2%. In addition, we study the

effect of repetition rate and high-voltage time on the output power characteristics of a cavity-dumped Tm:YAP

laser.

OCIS codes: 140.3460, 140.3480, 140.3580.

doi: 10.3788/COL201513.101402.

Eye-safe, diode-pumped all-solid-state lasers operating in

the spectral region near 2 μm are regarded as promising

sources for various applications in Doppler wind sensing,

differential absorption lidar, water vapor profiling, and

low-altitude wind shear detection

[1,2]

. The high repetition

rate, short pulse width, 2 μm pulse lasers are especially

widely used in industrial processing, laser ranging, scien-

tific research, etc.

[3,4]

Compared with a Q-switched oscillator, although it

could obtain a short-duration-pulse laser

[5]

, the cavity-

dumping technology has obvious advantages in many

factors such as achieving constant pulse duration indepen-

dent and repetition rates. In the process, the traveling

time of the acoustic wave or the switching speed of the

electrical signal mainly determines the pulse duration,

so we can achieve the output pulse that could satisfy both

a high repetition rate and a short pulse width. Compared

with acousto-optical cavity-dumped lasers, the electro-

optical cavity-dumped technology also has some signifi-

cant advantages. For example, the electrical signal’s rising

and falling edge time of the drive for the electro-optic

modulator can be done very shortly, which means that

we can achieve a very fast modulation speed and realize

a nanoseconds trigger value, and the cavity-dumping

efficiency can reach approximately a hundred percent

and the pulse width of electro-optical cavity-dumped

can be achieved in nanoseconds.

Diode-pumped Tm and Ho co-doped laser crystals and

single Tm-doped crystals are both excellent gain media for

generating a 2 μm laser

[6,7]

. But compared with a Ho-doped

laser, a Tm-doped laser has advantages of long fluores-

cence lifetimes and high quantum efficiency, and the

absorption peak of a Tm-doped crystal has a great amount

of overlap with the emission peak of the commercial laser

diode

[8,9]

. With the quick development of a high-power

1.9 μm laser as an efficient pump source, the 2 μm lasers

based on Ho-doped

[10]

and Tm-doped crystals

[11]

, such as

YLF, YAG, and GdVO

[12–16]

, have become prominent

in these applications and have been known very well.

The room-temperature Ho:LuAG

[17–19]

and Ho:ZnS have

been also demonstrated. For rare-earth ion-doped laser

host materials, YAP is chosen for studying as a promising

efficient singly-doped laser material

[20,21]

. Because YAP

crystallizes in the orthorhombic space group Pbnm

(D162h) this low symmetry (as compared to cubic

YAG) has two important consequences: the luminescence

is anisotropic and the laser emission is linearly polarized

[22]

which has virtually no depolarization loss.

In this Letter, we demonstrate a diode-pumped electro-

optical cavity-dumped Tm:YAP laser for the first time to

our knowledge. A pulse width of 7.1 ns is achieved at a

wavelength of 1996.9 nm. A maximum output power of

3.02 W is obtained with a pump power of 58.8 W at

the repetition rate of 100 kHz and the high voltage

time of 1000 ns, corresponding to an optical-to-optical

conversion efficiency of 5.2% and a slope efficiency of

approximately 9.1%. The pulses are coupled out of the

cavity through a thin film polarizer (TFP) when the

high voltage time is loaded on the electro-optical modula-

tor (EOM) periodically. In addition, we study the effect of

the repetition rate and the high voltage time on the output

power characteristics of a cavity-dumped Tm:YAP

laser.

The schematic diagram of the experimental setup is

depicted in Fig.

1. The resonatorconsists of four plane mir-

rors and one curved mirror. The radius of curvature of the

M1 is 300 mm and it is coated with 2 μm high-reflection

coatings; and 45° dichroic mirrors M2 and M3 are both

coated with 792 nm anti-reflection coatings and 2 μm

high-reflection coatings. The plane mirror M1 is also

coated with 792 nm anti-reflection coatings and 2 μm

high-reflection coatings. The mirror TFP is a thin film

COL 13(10), 101402(2015) CHINESE OPTICS LETTERS October 10, 2015

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首例电泵电光腔 dumped Tm:YAP 激光器：1996.9纳米输出功率与效率研究

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