Characteristics of perfluorinated amine media for
stimulated Brillouin scattering in hundreds of
picoseconds pulse compression at 532 nm
Wuliji Hasi (哈斯乌力吉)*, Hang Zhao (赵 航), Dianyang Lin (林殿阳)**,
Weiming He (何伟明), and Zhiwei Lü (吕志伟)***
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology,
Harbin 1500 80, China
*Corresponding author: hasiwuliji@126.com; **corresponding author: dianyanglin@163.com;
***corresponding author: zw_lu@sohu.com
Received February 9, 2015; accepted March 26, 2015; posted online May 11, 2015
The characteristics of stimulated Brillouin scattering (SBS) in perfluorinated amine media and the experimental
structure used in hundreds of picoseconds pulse compression at 532 nm are demonstrated. A two-stage SBS pulse
compression structure is adopted for this work. The compact double-cell SBS compression structure and the
scattering media FC-70 are chosen to compress the incident light from 9.5 to about 1 ns in the first stage. Then,
the light is used as the pumping source for the second pulse compression. In the second stage, using a single-cell
SBS structure in a pulse compression system, perfluorinated amine media with different phonon lifetimes, such as
FC-3283, FC-40, FC-43, and FC-70, are chosen to run the comparative experimental study. The narrowest com-
pressed pulse times obtained are 294, 274, 277, and 194 ps; they respectively correspond to the above listed
media. The average width of the compressed pulse width is 320 ps for FC-3283, with a fluctuation range of
87 ps. For FC-40, the average pulse width is 320 ps, with a fluctuation range of 72 ps. And for FC-43, the average
pulse width is 335 ps, with a fluctuation range of 88 ps. However, the average pulse width is only 280 ps for FC-
70, with a fluctuation range of 57 ps. The highest energy reflectivity is more than 80% for all of the
media. The experimental results show that a two-stage SBS pulse compression system has lower pump energy
requirements, thus making it easier to achieve a compressed pulse waveform. The results also show that the
shorter the phonon lifetime of the medium, the narrower the obtained compressed pulse width.
OCIS codes: 190.0190, 140.0140.
doi: 10.3788/COL201513.061901.
Inertial confinement fusion (ICF) has drawn the attention
of governments and academies because of its potential for
solving the energy crisis and supporting national security.
In 2007, Betti et al.
[1]
proposed a shock ignition scheme for
ICF, which pointed out that an igniter shockwave would
be launched if a laser pulse of hundreds of picoseconds
with energy of about 100 kJ could be generated. The shock
ignition scheme has had a great influence on the laser igni-
tion dream that researchers have been striving for nearly
40 years. However, one of the key technologies to achieve
the shock ignition is the generation of a driving laser pulse.
The driving laser pulse requires a width of about 200 ps,
energy of several kilojoules, and a pulse peak power of
10 TW, which presents a new challenge for the amplifica-
tion technology of a high-power laser.
Stimulated Brillouin scattering (SBS) pulse compres-
sion technology is a simple and practical method of
high-power laser pulse width compression. Not only does
it have a high pulse compression ratio and high-energy
conversion efficiency, but it also capable of eliminating
the wavefront aberrations of the laser pulse to improve the
beam quality. Hence, by using SBS pulse compression
technology, Stokes pulses with a width of hundreds of
picosecond, a peak power of terawatts, and energy of
several kilojoules can be obtained. This is the most direct
and cost-effective method in shock ignition research right
now. Although many people have studied SBS pulse com-
pression technology, they mainly focused on low-energy
nanoseconds pulses
[2–6]
. Only several teams have achieved
the order of magnitude of a laser in picoseconds. However,
the picosecond pulses have some defects, such as low
conversion efficiency, low load capacity, poor stability,
a short incident wavelength, repeated compression, and
excessively complex experimental devices
[7–9]
. In 2009,
Yoshida et al.
[10]
used FC-40 as the SBS medium in a com-
pact two-cell SBS system and compressed an incident light
from 13 ns to 160 ps. The maximum energy reflectivity
was about 80%, which is the highest pulse compression
ratio that has been achieved in a lab so far. The result is
satisfactory, but the requirement of 1 J of pump energy to
produce the seeds is very detrimental to the subsequent
amplification process. Therefore, looking for a kind of
structure that only requires a low pumping energy is very
necessary.
Our preliminary research shows that, besides the pump
parameters and the structure parameters, medium param-
eters also have a great influence on SBS pulse compression
efficiency, especially the medium phonon lifetime
[11]
. Along
with the further development of the research on SBS,
different kinds of fluorocarbon SBS media are being
COL 13(6), 061901(2015) CHINESE OPTICS LETTERS June 10, 2015
1671-7694/2015/061901(5) 061901-1 © 2015 Chinese Optics Letters
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