二极管泵浦Nd:Lu0.15Y0.85VO4双损耗调制Q开关激光器特性研究

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本文是一篇发表在《激光物理学》(Laser Physics) 2011年第21卷第9期的研究论文，探讨了二极管泵浦的双损耗调制Q开关和锁模Nd:Lu0.15Y0.85VO4激光器的特性。该研究重点关注了采用声光(AO)调制器和Cr(4+)：YAG作为可饱和吸收体的激光系统。通过改变声光调制器的频率(f(p))、Cr(4+)：YAG的小信号传输系数(T(0))以及输出耦合器的反射率(R)，作者研究了激光脉冲的特性，如脉冲宽度、单脉冲能量等。研究发现，当声光调制器频率降低(f(p)减小)时，单脉冲能量和锁模脉冲的峰值功率有所提升。同时，提高小信号传输系数(T(0)增加)也对脉冲能量有利，而脉冲宽度则呈现相反的趋势，即随f(p)减小和T(0)增加而减小。实验结果最佳的参数组合是f(p)=10 kHz、R=90% 和 T(0)=91%，在这个条件下，能够获得具有高稳定性和峰值功率的锁模激光脉冲。 Nd:Lu0.15Y0.85VO4因其性能优势，特别是在低泵浦功率水平下，被广泛应用于QML激光器。作为一种Nd:YVO4的同素异形体，Nd:LuVO4晶体因其潜在的优势引起了研究者的关注。这项研究不仅提升了我们对这类激光器的理解，还展示了如何通过精细调控技术改进其性能，这对于微加工、遥感、激光雷达、化学处理和相干通信等领域都有着实际的应用价值。本文提供了一种通过双损耗调制技术和优化参数来实现高性能锁模Nd:Lu0.15Y0.85VO4激光器的方法，为激光技术的进一步发展和应用提供了重要的理论支持和技术参考。

ISSN 1054660X, Laser Physics, 2011, Vol. 21, No. 9, pp. 1539–1544.

Original Text © Astro, Ltd., 2011.

1539

1. INTRODUCTION

Ultrashort picosecond’s pulse laser is a powerful

tool in the fields of micromachining, remote sensing,

raging, chemical processing, coherent telecommuni

cations, etc. This kind of laser is usually obtained by

means of the passive Qswitching and modelocking

techniques due to the advantages of simplicity, com

pactness and low cost. However if the single saturable

absorber, such as Cr

:YAG, is used [1–5], the singly

passively QML lasers have the poor shottoshot sta

bility and reproducibility as well as a low controllabil

ity for the pulse repetition rate. So the doubly QML

lasers can be employed to generate stable QML pulses

with higher peak power and the optional repetition

rate [6–9].

So far, some neodymiumdoped crystals have been

employed for QML lasers. Among them, Nd:YVO

has

been investigated in detail and has become the most

common medium for lasers operating at low pump

power levels [2, 8, 10, 11]. Meanwhile as an isomor

phism of Nd:YVO

, Nd:LuVO

crystals have been

proved to be excellent laser materials for diode

pumped QML lasers [4, 12–16]. Based on the

Nd:YVO

and Nd:LuVO

, a new class of mixed vana

date crystals Nd:Lu

1–

is developed. In com

parison to Nd:YVO

and Nd:LuVO

, the

Nd:Lu

0.15

0.85

crystal has longer fluorescence life

time (106

s) and smaller emission crosssections

(6.4

–19

) [17], which makes it more suitable

for application in pulsed laser systems, because

The article is published in the original.

smaller emission cross section of vanadate crystals

enhances its energy storage capacities, leading to

higher pulse energy and peak power. Moreover in a

Nd:Lu

0.15

0.85

crystal, the lattice sites formerly

occupied by Y ions in Nd:YVO

crystal are now occu

pied at random by Lu and Y ions. This modification of

the local crystal field neighboring the Nd ions will lead

to the inhomogeneous broadening of the fluorescence

line widths, which is much broader than those of the

vanadate single crystals (~1–2 nm) [17, 18] and even

mixed crystals (~2–4 nm) [19–22]. The inhomoge

neous broadening of the fluorescence line also leads to

the pulse energy enhancement.

For this kind of mixed crystal, the passively CW

modelocked laser has been reported [17, 23, 24], in

which shorter pulses and higher peak power can be

generated. Moreover, the passively Qswitching per

formance with Nd:Lu

0.2

0.8

crystal demonstrates

that it is a promising laser host material [25–28].

However, it is still lack of reports on simultaneously

QML Nd:Lu

1–

laser, which is also expected to

generate stable pulses.

In this paper, a diodepumped duallossmodu

lated QML Nd:Lu

0.15

0.85

laser with acoustooptic

(AO) modulator and Cr

:YAG saturable absorber is

presented for the first time as far as we know. The pulse

width, singlepulse energy and so on have been mea

sured for different smallsignal transmissions (

) of

:YAG, different reflectivity (

) of output coupler

(OC) and modulation frequencies (

) of the AO mod

ulator. The experimental results further confirm the

SOLID STATE

AND LIQUID LASERS

Characteristics of DiodePumped DualLossModulated

QSwitched and ModeLocked Nd:Lu

0.15

0.85

Laser

G. Zhang

, S. Z. Zhao

*, D. C. Li

, K. J. Yang

, G. Q. Li

K. Cheng

, Y. Zhang

, and B. Zhao

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

College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, China

*email: shengzhi_zhao@sdu.edu.cn

Received February 26, 2011; in final form, March 5, 2011; published online July 4, 2011

Abstract

—A diodepumped duallossmodulated Qswitched and modelocked (QML) Nd:Lu

0.15

0.85

laser with acoustooptic (AO) modulator and Cr

:YAG saturable absorber is presented. The stable QML

laser pulse with high peak power and complete modulation depth has been obtained. The QML laser charac

teristics such as the pulse width, singlepulse energy etc. have been measured for different smallsignal trans

missions (

) of Cr

:YAG, different reflectivity (

) of output coupler and modulation frequencies of the AO

modulator (

). The results show that the pulse energy increases with decreasing

and increasing

, while

the pulse width decreases with decreasing

and increasing

. At

= 10 kHz,

= 90%, and

= 91%, the

highest pulse energy and peak power of modelocked pulses is obtained.

DOI:

10.1134/S1054660X11150357

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