Simultaneousmodelockinginanacousto-opticQ-switchedNd:LuVO4laser资源-CSDN文库

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ISSN 1054660X, Laser Physics, 2009, Vol. 19, No. 11, pp. 2082–2085.

Original Russian Text © Astro, Ltd., 2009.

2082

1. INTRODUCTION

The ps or fs laser pulses are needed in several ways,

such as micromachining, laser ranging, surgery and

spectroscopy. It is well known that this kind of laser

pulses can be generated by diode pumped systems with

Qswitching and mode locking (QML). It usually

occurs in the modelocked lasers using saturable

absorbers, such as Cr

:YAG [1–3], GaAs [4–7],

LiF:F

[8], or LTIn

0.25

0.75

As [9]. However, the

pulse train was usually unstable. In order to obtain

more stable QML pulses, actively QML was intro

duced. Especially, the actively QML by using an

acoustooptic (AO) modulator can lead to a stable

QML regime of operation with considerable enhance

ment in peak power. By now, this kind of stable pulses

have been realized in a variety of lasers, like Nd:YVO

[10, 11] and Nd:GdVO

[12].

As we know, the neodymiumdoped vanadate crys

tals, Nd:YVO

and Nd:GdVO

, play an important role

in diodepumped laser system. Recently, Nd:LuVO

whose physical properties are similar to those of the

Nd:YVO

and Nd:GdVO

, has emerged as a promising

laser crystal for diode pumping. This kind of crystal

possesses even greater absorption cross section (6.9

–19

) at 0.8

m and emission cross section

(14.6

–19

) at 1.06

m and even wider fluores

cence line width (

Δλ ≈

1.5 nm) than those of both

Nd:YVO

and Nd:GdVO

. Compared to Nd:YVO

and

Nd:GdVO

, Nd:LuVO

lasers have higher slope effi

ciency and higher output power [2, 5, 6, 12–15]. So it

has attracted more interests.

The article is published in the original.

In this work, we report the results of an actively

Qswitched and mode locked Nd:LuVO

laser in order

to get better results than before. By using AO modula

tor only, a stable pulse train with great average output

power is obtained. Also we used a Ztype cavity,

because this kind of cavity is longer than threemirror

cavity and can strength the photon intensity in the

cavity. The higher average output power and deeper

modulation depth can be obtained.

2. EXPERIMENTAL SETUP

The schematic setup of our laser is depicted in

Fig. 1. The pump source employed was a fibercou

pled laserdiode array (FAP system, COHERENT

Inc., USA) which worked at the maximum absorption

wavelength (808 nm) of the Nd

ions. The pump

beam was focused into the laser crystal with a spot

SOLID STATE

AND LIQUID LASERS

Simultaneous Mode Locking in an AcoustoOptic

QSwitched Nd:LuVO

Laser

G. Zhang

, S. Z. Zhao

*, Y. F. Li

, G. Q. Li

, D. C. Li

, K. J. Yang

K. Cheng

, H. B. Ge

, and Z. G. Yu

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

Shandong Bright Optronics Inc., Jinan, 250100 China

*email: shengzhi_zhao@sdu.edu.cn

Received June 10, 2009; in final form, June 12, 2009; published online September 23, 2009

Abstract

—Simultaneous mode locking had been obtained in acoustooptic Qswitched Nd:LuVO

laser by

using a Ztype cavity. Pulses with great average output power and narrow pulse width were observed in our

experiment. The modulation depth is nearly 90% and the width of Qswitched envelope is about 70 ns, and

both maintained constant with the increase of pump power. The maximum average output power of 1.83 W

was obtained when the incident pump power was 6.78 W and the Qswitched envelop repetition frequency

was 30 kHz. Also the average pulse width of the mode locking among the Qswitched envelope is estimated

to be about 200 ps.

PACS numbers: 42.55.Px

DOI:

10.1134/S1054660X09210178

Fig. 1.

Configuration of actively Qswitched and mode

locked Nd:LuVO

laser.

M3 M4

Fibercoupled

laser diode

Focusing

optics

Nd:LuVO

AOM

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