A compact diode-pumped double pass Nd:YVO4 MOPA laser system was realized. The master oscillator was passively Q switched microchip laser, and 0.5W of average power at 20kHz, 2.4ns of pulse duration was output in TEM00. In order to achieve high efficiency and high gain amplification output, we designed a compact structure to collimate the pump laser and the seeder laser. In order to optimize the energy extraction and to reduce the thermal aberrations, the pump laser was collimated by a cylindrical microlens in the vertical direction, and the seed laser was collimated by focus lens. After double pass amplification, average output power of 12.5W at 20kHz, pulse duration of 2.5ns and M2 of 1.5 was achieved, corresponding to extraction efficiency of 31%.

1.
Ostermeyer
M.
,
Kappe
P.
,
Menzel
R.
,
Wulfmeyer
V.
,
Diode-pumped Nd:YAG master oscillator power amplifier with high pulse energy, excellent beam quality, and frequency-stabilized master oscillator as a basis for a next-generation lidar system[J]
,
Appl. Opt.
,
44
(
4
),
2005
,
582
–
590
.
https://doi.org/10.1364/AO.44.000582
Google Scholar
Crossref
Search ADS
PubMed
 
2.
Du
S.
,
Zhou
J.
,
Zhang
F.
,
Feng
Y
,
Lou
O.
,
Chen
W.
,
20-W average power, high repetition rate, nanosecond pulse with diffraction limit from an all-fiber MOPA system[J]
,
Microwave and Optical Technology Letters
,
50
(
10
),
2008
,
2546
–
2549
.
https://doi.org/10.1002/mop.23770
Google Scholar
Crossref
Search ADS
 
3.
O’Neill
W.
,
Li
K.
,
High-Quality Micromachining of Silicon at 1064 nm Using a High-Brightness MOPA-Based 20-W Yb Fiber Laser[J]
,
IEEE J. Sel. Top. in Quant. Electr.
,
15
(
2
),
2009
,
462
–
470
.
https://doi.org/10.1109/JSTQE.2009.2012269
Google Scholar
Crossref
Search ADS
 
4.
Hwang
D.
,
Ryu
S. G.
,
Misra
N.
,
Jeon H.
Grigoropoulos
 C. P.,
Nanoscale laser processing and diagnostics[J]
,
Applied Physics A: Materials Science & Processing
,
96
(
2
),
2009
,
289
–
306
.
https://doi.org/10.1007/s00339-009-5207-1
Google Scholar
Crossref
Search ADS
 
5.
Cerny
P.
,
Jelinkova
H.
,
Zverev
P.G.
,
Basiev
T.T.
,
Solid state lasers with Raman frequency conversion[J]
,
Prog. in Quant. Electr.
28
(
2
),
2004
,
113
–
143
.
https://doi.org/10.1016/j.pquantelec.2003.09.003
Google Scholar
Crossref
Search ADS
 
6.
John J.
Zayhowski
,
Passively Q-switched Nd:YAG microchip lasers and applications[J]
,
Journal of Alloys and Compounds
,
303–304
,
2000
,
393
–
400
.
https://doi.org/10.1016/S0925-8388(00)00647-2
Google Scholar
Crossref
Search ADS
 
7.
A.
Agnesi
,
P.
Dallocchio
,
F.
Pirzio
 et al,
Sub-nanosecond single-frequency 10-kHz diode-pumped MOPA laser[J]
,
Applied Physics B
,
98
,
2010
,
737
–
741
.
https://doi.org/10.1007/s00340-009-3813-4
Google Scholar
Crossref
Search ADS
 
8.
Zhe
Ma
,
Daijun
Li
,
Peng
Shi
 et al.
Compact multipass Nd:YVO4 slab laser amplifier based on a hybrid resonator[J]
,
J. Opt. Soc. Am. B
,
24
(
5
),
2007
,
1061
–
1065
.
https://doi.org/10.1364/JOSAB.24.001061
Google Scholar
Crossref
Search ADS
 
This content is only available via PDF.
© 2013 Laser Institute of America.
2013
Laser Institute of America
You do not currently have access to this content.