SPIE Defence, Security+Sensing
25 - 29 April 2011
Orlando World Center Marriott Resort & Convention Center
Orlando, Florida, USA
Femtosecond lasers and applications
New generation of compact femtosecond system for laser-based detection and identification of biological materials
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Paper 8032-3 of Conference 8032
Date: Monday, 25 April 2011
Author(s): Khan Lim, Yuan Liu, Matthieu Baudelet, CREOL, The College of Optics
and Photonics, Univ. of Central Florida (United States); Evgueni Slobodtchikov,
Peter Moulton, Q-Peak, Inc. (United States); Andrzej W. Miziolek, U.S. Army
Research Lab. (United States); Martin C. Richardson, CREOL, The College of
Optics and Photonics, Univ. of Central Florida (United States)
We show the use of a compact femtosecond lasers: a near-IR diode-pumped Yb:doped
CPA system (PFL-1047, Q-Peak) delivering pulses at 1047 nm, with a duration of
600 fs and an energy of 1.8 mJ at a repetition rate of 250 Hz. Comparison with a
nanosecond laser (Brillant, Quantel) in similar conditions on biological samples
such as yeast. The spectral detection range from 140 to 920 nm shows different
spectral features between the two regimes. The advantages of femtosecond and its
implementation as a compact system for LIBS will be discussed as well as the
future development for femtosecond LIBS on biological samples.
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LIBS
Monolithic, narrow linewidth, polarization maintaining, thulium fiber laser
using femtosecond laser written fiber bragg gratings
Paper 8039-15 of Conference 8039
Date: Monday, 25 April 2011
Author(s): Christina C. C. Willis, Joshua D. Bradford, CREOL, The College of
Optics and Photonics, Univ. of Central Florida (United States)
We describe a monolithic diode-pumped thulium fiber laser incorporating
femtosecond written fiber Bragg gratings (FBGs) for linewidth narrowing and
wavelength stabilization. The laser cavity utilizes polarization maintaining,
single-mode fibers. A Tm:fiber is spliced to passive fibers at either end,
containing a high reflectivity (99%) FBG and a low reflectivity (34%) FBG output
coupler respectively. This laser produces an average spectral width of 90 pm up
to 5.24 W. The output is preferentially polarized parallel to the slow axis of
the fiber with an average polarization extinction ratio of 17 dB from 0 to 5 W.
Generation and amplification of femtosecond laser pulses in Tm:fiber
Paper 8039-18 of Conference 8039
Date: Monday, 25 April 2011
Author(s): Robert A. Sims, Pankaj Kadwani, Lawrence Shah, Martin C. Richardson,
CREOL, The College of Optics and Photonics, Univ. of Central Florida (United
States)
We describe the generation and amplification of femtosecond pulses at 2-μm
wavelength in Tm: fiber. The Tm:fiber mode-locked oscillator produces stable
soliton pulses at 70 MHz repetition rate with 40 pJ pulse energy, centered at
~1.97 micron wavelength with ~8 nm (FWHM) spectral width. These pulses seed a
Tm:fiber based Raman amplifier, which increases the energy up to 9 nJ. The
spectrum is broadened up to 40 nm (FWHM) producing time bandwidth pulses <150 fs
and the center wavelength can be shifted from ~1.97 - 2.15 micron. Chirped pulse
amplification of the output from the Raman amplifier will be discussed.
Fiber-optic intrinsic Fabry-Perot interferometric sensors fabricated by
femtosecond lasers
Paper 8034-6 of Conference 8034
Date: Wednesday, 27 April 2011
Author(s): Tingyun Wang, Shanghai Univ. (China)
In this talk, intrinsic Fabry-Perot (F-P) micro-cavity interferometric sensors
are reported. The fs lasers are directly focused into the SM fiber to fabricate
an in-core mirror due to the laser induced relative RI difference. The F-P
micro-cavity is realized by a pair of mirrors. Different writing methods and
their relations with the sensor property are discussed. The insert loss of the
sensor is ~0.2 dB. This enable it a good multiplexing capability. Meanwhile,
high fringe visibility was achieved up to ~10 dB. Experiment results show that
the reflection spectrum shifts linearly against the temperature with the
sensitivity of 10.6 pm/℃.
Micro-structured sapphire fiber sensor for measurement of high-temperature in
harsh environments
Paper 8034-7 of Conference 8034
Date: Wednesday, 27 April 2011
Author(s): Xia Fang, Tao Wei, Yukun Han, Baokai Cheng, Xinwei Lan, Hai Xiao,
Missouri Univ. of Science and Technology (United States)
A novel, assembly-free hybrid extrinsic/intrinsic Fabry-Perot interferometer
(HEIFPI) has been fabricated by femtosecond laser micromachining on sapphire
fiber. This kind of micro-structure can survive and maintain operational in
high-temperature up to 1575 oC . The integrated micro-structure provides good
long-term stability in extremely high temperatures, and the possibility to be
deployed into the hot zones of advanced power and fuel systems as a temperature
sensor.
Detection of microwave emission from solid targets ablated with an ultra-short
pulsed laser
Paper 8037-22 of Conference 8037
Date: Thursday, 28 April 2011
Author(s): Joseph A. Miragliotta, Benjamin Brawley, Caroline Sailor, James B.
Spicer, Jane W. Spicer, The Johns Hopkins Univ. (United States)
Over the past two decades, numerous reports have noted the generation of
electromagnetic emission in the microwave region of the spectrum (~1 to 30 GHz)
from targets that were ablated with high peak power, ultra-short pulsed laser
(USPL) sources. Our group is investigating the generation of microwave emission
from a variety of materials, including metals and insulators, via ablation with
a femtosecond pulsed laser (peak powers in excess of 1012 Watts, pulse width ~
30 fsec). Results include: microwave amplitude as a function of laser fluence,
emission angle, and emission lifetime.
Terahertz light amplification by stimulated emission of radiation from optically
pumped graphene
Paper 8023-3 of Conference 8023
Date: Monday, 25 April 2011
Author(s): Taiichi Otsuji, Stephane Albon Boubanga Tombet, Akira Satou, Tohoku
Univ. (Japan); Victor Ryzhii, Univ. of Aizu (Japan)
[Invited] This paper reviews recent advances in terahertz light amplification by
stimulated emission of radiation from optically pumped graphene. Possibility of
terahertz negative dynamic conductivity is first described. Then experimental
verification utilizing an exfoliated graphene under femtosecond IR laser pumping
is demonstrated. The result will lead to a new type of terahertz lasers.
Spectroscopic terahertz imaging for food safety inspection
Paper 8023-24 of Conference 8023
Date: Tuesday, 26 April 2011
Author(s): Thomas Arnold, Martin De Biasio, Raimund Leitner, Carinthian Tech
Research AG (Austria)
Recent developments in THz instrumentation in combination with a better
understanding of the mechanisms behind the interaction of THz radiation and
materials make THz spectroscopy and in particular THz spectroscopic imaging
promising technologies for a wide range of applications. The present work
describes a laboratory measurement system consisting of a state of the art
femtosecond fiber laser based THz time domain imaging spectrometer. The system
is used to investigate the possibilities to detect foreign bodies like wood,
stone, glass, metal or plastic particles in dry food. Moreover, the chemical
composition and moisture content are analyzed.
Atmospheric gas detection using broadband mid-IR thulium fiber-based sources
Paper 8039-19 of Conference 8039
Date: Monday, 25 April 2011
Author(s): Pankaj Kadwani, Robert A. Sims, CREOL, The College of Optics and
Photonics, Univ. of Central Florida (United States); Jeffrey Chia, College of
Optical Sciences, The Univ. of Arizona (United States); Faleh Altal, Masdar
Institute of Science and Technology (United Arab Emirates); Lawrence Shah,
Martin C. Richardson, CREOL, The College of Optics and Photonics, Univ. of
Central Florida (United States)
We investigate the utility of a Tm:fiber laser, producing femtosecond pulses at
2-μm wavelength, for atmospheric trace gas detection. The system produces >500
mW average power with 9 nJ pulse energy and <150 fs pulse duration, with the
center output wavelength tunable from ~1.97 - 2.15 μm. This smooth, ~40 nm wide
(FWHM) spectrum enables simultaneous measurement of multiple CO2 absorption
lines. We also report on this laser as a pump source for supercontinuum
generation, with the goal of developing a compact and efficient broadband light
source spanning the 3-5 μm wavelength range for trace hydrocarbon detection.
Laser terahertz emission microscope
Paper 8023-26 of Conference 8023
Date: Tuesday, 26 April 2011
Author(s): Masayoshi Tonouchi, Sunmi Kim, Shogo Fujiwara, Iwao Kawayama,
Hironaru Murakami, Osaka Univ. (Japan)
[Invited] Recent progress of laser terahertz (THz) emission microscope (LTEM) is
reviewed. Femtosecond lasers can excite the THz waves in various electronic
materials due to ultrafast current modulation. The current modulation is
realized by acceleration or deceleration of photo-excited carriers, and thus
LTEM visualizes dynamic photo-response of substances. The developed systems have
a minimum spatial resolution better than 0.6 μm, which is defined by the laser
beam diameter. We also developed pump and probe type LTEM to visualize spatial
dynamic carrier response and applied it to study photoconductive switches. In
addition, we will discuss it application.
Detection and identification of explosives hidden under barrier materials: What
are the THz-technology challenges?
Paper 8017-43 of Conference 8017
Date: Wednesday, 27 April 2011
Author(s): Arthur D. van Rheenen, Magnus W. Haakestad, Norwegian Defence
Research Establishment (Norway)
We describe experiments where different explosives were hidden under common
barrier materials, and THz radiation was used to detect and identify these
explosives. Our THz system, a time-domain spectroscopy (TDS) system, is based on
a femtosecond laser whose radiation is converted into THz radiation by a
low-temperature grown GaAs photoconductive switch. A similar switch detects the
reflected signal. The advantage of using a TDS system is that pulses reflected
from the barrier and the actual explosive, arrive at different instances at the
detector. However, partial temporal overlap occurs, hampering detection and
recognition. In addition, there are other factors that make this process
difficult. We shall address these issues and discuss strategies that may be used
to face these challenges.
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Product Data Sheets
Del Mar Photonics Product brochures - Femtosecond products data sheets (zip file, 4.34 Mbytes) - Del Mar Photonics
Send us a request for standard or custom ultrafast (femtosecond) product
Pulse
strecher/compressor
Avoca SPIDER system
Buccaneer femtosecond
fiber lasers with SHG Second Harmonic Generator
Cannon Ultra-Broadband Light
Source
Cortes Cr:Forsterite
Regenerative Amplifier
Infrared
cross-correlator CCIR-800
Cross-correlator Rincon
Femtosecond Autocorrelator
IRA-3-10
Kirra Faraday Optical Isolators
Mavericks femtosecond
Cr:Forsterite laser
OAFP optical attenuator
Pearls femtosecond fiber laser
(Er-doped fiber, 1530-1565 nm)
Pismo pulse picker
Reef-M femtosecond scanning
autocorrelator for microscopy
Reef-RTD scanning
autocorrelator
Reef-SS single shot
autocorrelator
Femtosecond Second Harmonic Generator
Spectrometer ASP-100M
Spectrometer ASP-150C
Spectrometer ASP-IR
Tamarack and Buccaneer
femtosecond fiber lasers (Er-doped fiber, 1560+/- 10nm)
Teahupoo femtosecond Ti:Sapphire regenerative amplifier
Femtosecond
third harmonic generator
Tourmaline femtosecond fiber
laser (1054 nm)
Tourmaline TETA Yb
femtosecond amplified laser system
Tourmaline Yb-SS
femtosecond solid state laser system
Trestles CW Ti:Sapphire
laser
Trestles femtosecond
Ti:Sapphire laser
Trestles Finesse
femtosecond lasers system integrated with DPSS pump laser
Wedge Ti:Sapphire multipass amplifier
Femtosecond Literature