Nd:GGG激光器泵浦的KTiOPO4晶体实现1125nm-1567nm多波长同时运行

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本文主要探讨了一项先进的光学技术，即使用单个钾钛酸钡（KTiOPO4）晶体，在一个被动调Q（Passively Q-switched）的钕掺杂 gadolinium gallium garnet (Nd:GGG) 激光器的驱动下实现多波长同时操作的研究。这项工作发表于2014年，作者为Hongwei Chu、Shengzhi Zhao等人，来自山东大学的信息科学与工程学院。研究人员通过将KTiOPO4作为内部腔内的光学参数振荡器（OPO）和拉曼晶体，实现了在1125纳米、1161纳米和1567纳米这三个不同波长的高效协同工作。这种多波段操作是通过在Nd:GGG激光器中集成Cr4+:YAG可饱和吸收器来实现的，它能有效地控制激光脉冲的产生和放大。在10.5瓦的激光二极管功率下，KTiOPO4晶体展现出出色的性能。1566.8纳米波长处的最大输出功率达到了302毫瓦，对应的光学到光学转换效率高达2.88%，显示出晶体在此波段的有效利用。而在1124.9/1160.7纳米双波长区域，输出功率达到了115毫瓦，相应的效率为1.1%，尽管这两个波段的效率稍低，但它们在特定应用中的潜在价值不容忽视。此外，文中还报告了脉冲特性。1566.8纳米处的最短脉冲持续时间为1.61纳秒，这表明该系统的高频响应能力。而在1124.9/1160.7纳米的波段，最小脉冲持续时间达到了2.88纳秒，这反映了晶体对不同频率成分的处理能力。这项研究对于多功能激光系统的设计和开发具有重要意义，它展示了通过优化晶体材料和泵浦源，可以在单一装置中实现多个波长的高效输出，这对于光纤通信、光谱分析以及量子信息等领域都有着广泛的应用潜力。未来的研究可能进一步提升效率和脉冲质量，推动多波长光源技术的发展。

Simultaneous operations at 1125 nm, 1161 nm, and

1567 nm from a single KTiOPO

crystal

pumped by a passively Q-switched Nd:GGG laser

Hongwei Chu, Shengzhi Zhao,* Kejian Yang, Yufei Li, Guiqiu Li, Dechun Li, Jia Zhao, Wenchao Qiao, and Tao Li

School of Information Science and Engineering, Shandong University, Jinan 250100, China

*Corresponding author: shengzhi_zhao@sdu.edu.cn

Received November 5, 2013; revised January 2, 2014; accepted January 2, 2014;

posted January 3, 2014 (Doc. ID 200609); published January 31, 2014

A multiwavelength operation generated from an intracavity optical parametric oscillator (OPO) pumped by a pas-

sively Q-switched Nd:GGG laser with a Cr

4

:YAG saturable absorber is demonstrated. KTiOPO

simultaneously

worked as nonlinear OPO and Raman crystal. Maximum output powers of 302 mW at 1566.8 nm and 115 mW

at 1124.9∕1160.7 nm were obtained at a diode power of 10.5 W, corresponding to the optical-to-optical conversion

efficiencies of 2.88% and 1.1%, respectively. The measured shortest pulse duration at 1566.8 nm was 1.61 ns, while

OCIS codes: (190.4410) Nonlinear optics, parametric processes; (190.4970) Parametric oscillators and amplifiers;

(140.3550) Lasers, Raman; (140.3540) Lasers, Q-switched.

http://dx.doi.org/10.1364/OL.39.000723

Simultaneous multiwavelength operation has attracted a

lot of attention because of the applications in various

fields, such as differential spectroscopy, enviro nmental

monitoring, and nonlinear optics, especially in terahertz

(THz) generation [

1]. There are several approaches to

obtain multiwavelength operation. Among these ap-

proaches, the frequency conversion based on nonlinear

crystals has been verified to be an efficient way. Based on

second-order nonlinearity χ

2

[2] and third-order nonli-

nearity χ

3

[3], the multiple radiations have been realized.

Nowadays, the combination of χ

2

and χ

3

has become

an interested research field in the spotlight [

4–7].

KTiOPO

(KTP) crystal is a commonly used non-

linear medium for the effects arising from χ

2

nonlinear-

ity, such as second-harmonic generation (SHG),

sum-frequency mixing (SFM), difference frequency gen-

eration (DFG), and parametric amplification. The spon-

taneous Raman spectra of KTP crystal indicated also

that KTP could be used in a practical stimulated Raman

scattering (SRS) converter and the strongest Raman

scattering near 270 cm

−1

was observed [8]. By combining

the effects from χ

2

and χ

3

, Y. Chen once reported an

efficient second Stokes conversion with simultaneous

self-SFM and self-SHG in a single KTP crystal [

9]. In

addition, another combination of χ

2

and χ

3

, i.e., simul-

taneous OPO and SRS nonlinear processes from a

single nonlinear crystal, has raised increasing interests.

By using a periodically poled KTP (PPKTP) crystal,

Pasiskevicius et al. have demonstrated a simultaneous

optical parametric and Raman oscillation [

10]. Further-

more, coexistent Raman and parametric conversion for

the same fundamental wave has been realized. Using

KTiOAsO

a single KTA crystal, Liu et al. once reported

a dual-wavelength simultaneous oscillation at the first

Stokes line and the signal wavelength [

11]. Based on a

KTP crystal, a dual-wavelength operation at the first

Stokes radiation of 1096 nm and signal wave of 1572 nm

has been reported [

7].

In order to obtain the laser radiation in the eye-safe

region (∼1.5–1.6 μm), SRS nonlinear conversion is a

common approach [

12,13]. However, the obtained optical

efficiencies are low, and the required threshold pump

power intensities are very high [

13]. On the contrary,

OPO process pumped by a 1.06 μm laser is an attractive

way to access this spectral region with a high con version

efficiency [

14].

Actually, spectral wavelengths at the range from 1120

to 1160 nm have attracted a lot of attentions owing to the

capabilities to pump Tm-Ho-doped fiber lasers [

15] and

Raman lasers or amplifiers at 1178 nm [

16]. It is a poten-

tial technique to generate the corresponding pump

sources with high peak powers from the all-solid-state

laser systems. Because of the advantages of the KTP

crystal such as the high nonlinear coefficient and damage

threshold, it is attractive and expected to obtain the

diverse wavelengths at the second and the third SRS

radiations near 1120 and 1160 nm as well as the signal

wavelength around 1570 nm from a compact, simple

and efficient laser system.

In this Letter, based on the simultaneous OPO and SRS

processes, we demonstrate a multiwavelength operation

at 1124.9, 1160.7, and 1566.8 nm pumped by a passively

Q-switched Nd:GGG laser with Cr

4

:YAG saturable

absorber. A 5 mm × 5 mm × 20 mm KTP crystal is simul-

taneously employed as the OPO and Raman crystal. The

second Stokes wavelength at 1124.9 nm, the third Stokes

line at 1160.7 nm, and the signal wavelength of the intra-

cavity OPO at 1566.8 nm were obtained. Under the diode

power of 10.5 W, a maximum output power of 302 mW at

1566.8 nm, 115 mW at 1124 .9∕1160 .7 nm were achieved,

corresponding to the conversion efficiencies 2.88% and

1.1%, respectively. The shortest pulse durations for

OPO and SRS were 1.61 and 2.88 ns, respectively.

The experimental setup of the KTP intracavity OPO

and SRS conversions pumped by a passively Q-switched

Nd:GGG laser with Cr

4

:YAG saturable absorber is

shown in Fig.

1. The pump source was a fiber-coupled

laser-diode (FAP-I system, Coherent Inc., USA) with

central wavelength at 808 nm. The pump beam was

collimated and focused into the Nd:GGG crystal with

a spot of 400 μm in diameter by an optics system.

The Nd:GGG crystal (5 mm × 5 mm × 5 mm, 1 at.

February 1, 2014 / Vol. 39, No. 3 / OPTICS LETTERS 723

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