文章编号:1002-2082(2007)01-0063-05
抽运光对激光束空间分布影响
程度的估算方法研究
王石语
1
, 王欣媛, 过 振, 蔡德芳, 文建国, 李兵斌
(西安电子科技大学 技术物理学院, 西安 710071)
摘 要: 为便于评价两种光场空间分布之间的偏离程度,引入一个数学参数
δ
进行研究。将该参
数应用到谐振腔内分析了抽运光空间分布对基模振荡光光束质量的影响。这种影响主要表现为:
若抽运光在激光介质中引起非均匀的增益分布,基模振荡光将偏离高斯分布。 利用
δ
参数对这种
影响的程度进行了定量估算。定量研究表明:
δ
参数可以直观地反映泵浦光分布对激光器光束质
量的影响程度,而且在激光器的设计中
δ
参数的大小可衡量泵浦光分布的优劣。对于端面泵浦二
极管泵浦固体激光器(
DPL
),稳恒运转下最理想的抽运光分布形式是高斯型抽运光,其半径等于
谐振腔的基模高斯振荡光半径。
关键词:
DPL
;光束质量;抽运光分布
中图分类号:
TN
248.4 文献标志码:
A
Estimation method toeliminate effects of pumping
light on space distribution of laser beam
W A N G Shi-yu
1
, W A N G X in-yuan, G U O Zhen, C A I D e-fang, W E N Jian-guo, LI Bing-bin
(
Schoolof T echnicalPhysics
,
Xidian U niversity
,
Xi
′
an
, 710071,
China
)
Abstract
:
A m athem atical param eter δis adopted to assess the different space distribution in
tw o laser fields. T he effect ofthe pum ping light space distribution on the quality of the ground-
m ode oscillating beam is analyzed by applying δin the resonant cavity
.
T he analysis for the
effect show s that the ground-m ode oscillating beam w ill drift off the G auss d istrib u tio n if th e
nonequilibrium gain distribution is caused by pum ping light in the laser m edium
.
W ith th e
param eter δ, the quantitative estim ation w as carried out for the effect of the pum p light on the
quality of oscillating beam
.
T he investigation show s thatthe param eter δ
,
can d irectly represen t
the effect of pum ping light distribution on the beam quality of laser, and the value of the
param eter δcan be used to judge the pum ping light distribution quality
.
Asfortheend
-
pum ping
D PL w ith continuous operation, the m ost ideal distribution m ode of the pum ping light is the
G auss pum ping light and its diam eter is equalto that ofthe fundam ental
-
m ode G auss oscillating
beam of the resonant cavity.
Ke y words
:
DPL
;
beam quality
;
distribution of pum ping
light
收稿日期:2006-10-15; 修回日期:2006-11-10
基金项目:国家重点实验室基金资助项目(51438010205
DZ
0101)
作者简介:王石语(1966- ),男,陕西临潼人,博士,西安电子科技大学技术物理学院教授,主要从事新型激光器件与技术的
研究工作。E -m ail:yshi@ m ail.xidian.edu.cn
2007 年 1 月
JournalofA pplied O ptics
Jan
.,2007
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