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This PDF file contains the front matter associated with SPIE Proceedings Volume 8071, including the Title Page, Copyright information, Table of Contents, Introduction, and the Conference Committee listing.
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The near-IR light absorption oscillations in 2D macroporous silicon structures with microporous silicon layers, CdTe
surface nanocrystals and SiO2 nanocoatings are investigated. The electro-optical effect was taken into account within the
strong electric field approximation. Well-separated oscillations with giant amplitude were observed in the spectral ranges
of surface level absorption. This process is because of resonance electron scattering on the surface impurity states with
the difference between two resonance energies equal to the Wannier-Stark ladder due to big scattering lifetime as
compared to the electron oscillation period in an electric field. The electron transitions and free electron motion are
realized due to additional change of local electric field as a result of grazing light incidence and quasi-guided mode
formation.
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The aim of this work is to compare advantages and disadvantages of different techniques for coupling a mini-discoptical-
resonator to determine quality factor of its resonance. Optical fiber coupled to a resonator consists in a mini disc
with whispering gallery modes at its circumference. We choose to work with three materials and design compact
miniresonators. Fused silica is found to be suitable for these applications thanks to its hardness in the range 6-7 and the
behavior to mechanical shocks, despite its sensitivity to water pollution. With its tetragonal crystal and a good behavior
with risk of water pollution, Calcium fluoride is a good candidate despite sensitivity to mechanical shocks. Magnesium
fluoride is the third material used. As a critical step, taper coupling is set with a 20nm resolution positioning system.
Miniresonator is excited from a system equipped with a tunable laser diode with a tunability from 1490 to 1640 nm and a
linewidth narrower than 300kHz. Light is coupled into the microsphere either from glass or fiber prism or with fiber
taper via evanescent field. We have also used a single frequency 660nm laser diode with a linewidth narrower than
100kHz which can be tuned about 10pm to test a single resonant peak. Both sources are used with either a tapered fiber
or a filed fiber. Resonance is observed and quality factor of the resonators is found to be in the range of 108.
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Stochastic quasi-phase-matching of the process of spontaneous parametric down-conversion is analyzed. It is
shown that spectral, temporal and spatial properties of photon pairs generated in randomly poled crystals are
similar to those generated in chirped periodically-poled crystals. Especially, randomly poled crystals are capable
to emit photon pairs with ultra-broad spectra.
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In this paper we construct the solution of nonlinear Schrödinger equations, describing the three-wave interaction in
medium with combined (cubic and quadratic) nonlinear response under the condition of long pulse duration and plane
wave approximation. The main feature of applied approach concludes in using of Hamiltonian of the equations set to
find the algebraical equation with respect to difference of phases of interacting waves without the solution of the
corresponding differential equation.
For three-wave interaction we write the integral which depends on mismatching of wave-vectors and on input intensities
of interacting waves. The evolution of intensity of each wave is express by the elliptical function.
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In the present paper we consider a simultaneous propagation of two weak pulses (the 'probe' and 'trigger') in the tripod
configuration atomic medium, irradiated by a strong quasi-standing control field. The latter leads to a periodic
modulation of the refractive index of the medium which now becomes a photonic crystal. While propagating in such a
medium both probe and trigger are split into transmitted and reflected components the nonlinear phase shifts of which
are of particular interest.
We calculate the nonlinear periodic susceptibilities and make numerous simulations of the propagation of the
stationary pulses in different conditions. We calculate the phases of the outgoing fields and find the optimal values of
parameters characterizing the system, i.e. when the nonlinear phase shifts of both transmitted and reflected probe and
trigger components are large. We show a convenient way of controlling the process by shifting the frequency of the
incoming probe. We plot the transmission and reflection spectra for different values of parameters of the system, which
could be used as a flexible beam splitter, for which the phases and intensities of outgoing beams can be independently
changed.
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Lithium Niobate (LN) based electro-optic modulators are well known in the optical communications field, due to their
high bandwidth and deep rejection ratio [1]. These performances could be used in the field of astronomy for stellar
interferometry in the mid-infrared domain [2]. With our partners from Photline Technologies, we have conceived,
developed and characterized a 2T ABCD [3] beam combiner in the near-infrared (1.5μm, the H-band in astrophysics).
The modulation scheme, presented below in Figure 1, allows to determine the fringe characteristics in a single shot
measurement, without the need to externally scan the optical phase delay. Fine adjustment of the relative phase can be
achieved using the electro-optic properties of the lithium niobate waveguides. In particular, the phase on each output can
be electrically controlled and locked by using appropriate electrodes. These devices have to ensure modal filtering to
reject optical aberrations of the wavefront and thus optimize the fringes contrast, which means that they have to be single
mode through all the spectral range of interest. This also means that the couplers should be achromatic and balanced in
order to optimize the fringe contrast. We will present results on global transmission, performance of the couplers and the
electro-optic behavior of the device using monochromatic as well as wide spectral sources in the H-band.
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Nature has developed sophisticated methods to create structure-based colors as a way to address the need of a wide
variety of organisms. This pallet of available structures presents a unique opportunity for the investigation of new
photonic crystal designs. Low-temperature sol-gel biotemplating methods were used to transform a single biotemplate
into a variety of inorganic oxide structures. The density of optical states was calculated for a diamond-based natural
photonic crystal, as well as several structures templated from it. Calculations were experimentally probed by
spontaneous emission studies using time correlated single photon counting measurements.
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Attosecond XUV pulses (80 as, 1 as = 10-18s [1, 2]) together with phase-stabilized few-cycle
(few-femtosecond) laser pulses [3] used for their generation have enabled the development of a technique for attosecond sampling of electrons ejected from atoms or molecules [4, 5]. After the generation of attosecond pulses on a daily base and their characterization at high precision has been made possible, the dynamics of the photoionization process on solids has been studied
[6]. Not only that attosecond metrology now enables clocking on surface dynamics, but also the individual behaviour of electrons of different type (core electrons vs. conduction band electrons) can be resolved. Here, we measured a time delay of about 100 as on the emission of the aforemention two types of electrons. The information gained in these experiments may have influence on the development of many modern technologies including semiconductor and molecular electronics, optoelectronics, information processing, electrochemical
reactions, etc..
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We review recent advances in the generation of isolated attosecond pulses, produced by using the process of
high-order harmonic generation in gases. In particular we report on a novel technique, based on the production
of a temporal gate obtained exploiting sub-cycle ionization dynamics of the neutral atom population. Isolated
attosecond pulses with time duration of 155 as and an energy on target of 2.1 nJ were generated and fully
characterized. Such isolated pulses can be used in attosecond pump-probe experiments to study ultra-fast
electronic dynamics in atoms and molecules with attosecond temporal resolution.
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We take advantage of the Raman soliton self-frequency shift experienced during the propagation in an anomalous
dispersive photonic crystal fiber in order to continuously tune the central frequency of ultrashort pulses. We discuss the
fiber properties to be favored to obtain high power spectral densities and we carry out an extensive experimental study of
the properties of the frequency shifted pulses in terms of spectral, autocorrelation, and RF spectrum measurements.
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The properties of NPC structures in strontium tetraborate are analyzed. Different types of NPC structures are revealed
that possess different nonlinear properties, and their spectral dependences of frequency conversion efficiency are
calculated and compared. Experimental study of these structures is reported for the process of doubling of the second
harmonic of fs Ti:S laser. Tuning of generated radiation is obtained in the range 187.5 - 232.5 nm, with extreme
insensitivity to the angular orientation of NPC. Behavior of tuning curve along investigated fundamental wave range is
similar in all studied samples, but efficiency obtained depends on the type of structure. Conversion efficiency and
spectral quality of generated radiation is experimentally shown to grow better when using NPC with improved structure.
Prospects of VUV converter on a single NPC are discussed. NPCs of SBO are demonstrated to be useful for
autocorrelation diagnostics both in random QPM geometry and in the geometry of nonlinear diffraction from virtual
beam.
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We analyse the group velocity of a laser pulse in an optically dressed atomic system. A Λ system with
an additional close upper level and an incoherent pump is specially investigated. The group velocity of a
pulse is strongly dependent on the optical properties of the system which can be modified by changing the
amplitude or detuning of a strong coupling field or of an incoherent pump between the two lower levels of the
system. Depending on the parameters, the medium may have alternatively absorptive or gain properties and
the dispersion can be changed from anomalous into a normal one. The ranges of parameters are especially
investigated in which absorption (gain) is not too strong, with dispersion being not too steep. The group
velocity of a pulse propagating through a sample with such optical properties can be switched from the subinto
superluminal regime.
The dynamics of propagation in the case of negative group velocities of a small absolute value is especially
interesting. In such a regime the peak of the transmitted pulse exits the sample before the peak of the
incoming pulse reaches the medium. The transmitted pulse splits into two pulses - one of them propagates
forward behind the medium and the other propagates backward and is cancelled at the entrance of the
sample by the incoming pulse. Ranges of parameters are seeked in which the shape of the pulse is changed
and the group velocity as a single parameter is not sufficient to describe the pulse propagation.
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In this work, we investigate experimentally second-harmonic generation (SHG) of pulsed near-infrared (NIR) diode laser
radiation in a nonlinear crystal with a ridge waveguide structure. Pulses at 1064 nm with a pulse energy of 560 pJ, a peak
power of 3.2 W and a pulse length of 138 ps are generated at a repetition rate of 10 MHz by a monolithic DFB
(Distributed Feedback) tapered MOPA (Master Oscillator Power Amplifier). For frequency doubling, a periodically
poled MgO-doped lithium niobate crystal with a ridge waveguide structure is used. During SHG, a dependence of the
second-harmonic (SH) pulse duration on the NIR pulse energy as well as a distinctive influence of the waveguide
structure on the beam quality is observed. A maximum SH peak power at 532 nm of 0.75 W and an opto-optical
conversion efficiency of 24 % are achieved. Furthermore, an influence of the spectral distribution of the NIR laser
radiation on the SHG conversion efficiency is observed.
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In this paper we describe recent progress in the study of scale-free optical propagation in super-cooled nonergodic
ferroelectrics. Our experimental and theoretical findings indicate that a regime can be found in which
diffusion-driven photorefractive effects can fully annul the diffraction of focused laser beams. This demonstrates
that diffraction can be systematically eliminated from an optical system and not simply compensated, with
fundamental implications for optical imaging and microscopy. The effect transfers directly from the paraxial
regime into the non-paraxial regime described by the Helmholtz Equation, and suggests a means to achieve the
propagation of super-resolved optical images. The result is a nonlinear-based metamaterial, even though the
underlying nano-structuring of the ferroelectric is random and the effect is both non-absorptive and wavelengthindependent
for a wide spectrum.
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In this work we study the photorefractive and electro-optical properties of Zirconium-doped congruent lithium
niobate (LN) crystals. In order to set the ground for the utilization of these crystals in nonlinear wavelengthconversion
devices, we investigate the dependence of the photorefractive properties of the crystals on dopant
concentration and incident power. In our experiments the birefringence variations induced by a 532-nm laser beam
are measured by using the Sénarmont method, in the ZrO2 concentration range 0-3mol% and intensity range 155-
1800 W/cm2. In order to investigate photorefractivity at high intensities, we have also utilized the direct observation
of the distortion of the light spot transmitted by the crystal. In presence of photorefractivity, the transmitted light
spot becomes smeared and elongated along the c-axis. Our data show that the threshold ZrO2 concentration can be in
the range 2.5-3mol%. Considering that the growth of large homogeneous Zr:LN crystals should be easier than for
Mg:LN, and that electrical poling of these crystals has already been demonstrated, Zr-doped LN could represent a
more convenient choice than Mg:LN for the realization of room-temperature wavelength converters.
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Second-harmonic generation (SHG) and electro-optic (EO) modulation were studied on thermally poled twin-hole fiber.
Metal electrode wires were inserted into the side holes. The typical poling condition was 2.5 kV, 300 °C, and 40 min.
SHG was measured using a Q-switched Nd:YAG laser. The SH power did not depend on the applied forward or reverse
voltages. SHG without poling was also measured, then the maximum power was about 1/18 that of the poled SHG. EO
modulation was performed using a twin-hole fiber inserted to a fiber-optic Mach-Zehnder interferometer. An AC
modulation voltage was applied to the electrodes together with a DC bias voltage. Without poling, the modulation output
was obtained only when a DC bias voltage was applied simultaneously. After poling, a modulation output was obtained
without any bias voltage, and for the forward DC bias the modulation output increased with the bias voltage. For the
reverse DC bias the modulation output showed the minimum for a bias voltage. The origin of the second-order
nonlinearities and the other effects in the above SHG and EO modulation are discussed considering charge layers.
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Generation of two-photon light with given spectral and temporal properties is of great interest for quantum
communication and quantum metrology applications. In particular, preparation of biphotons with ultra-narrow
correlation time is a very important task. In a recent series of papers, our group analyzed the generation of twophoton
wavepackets, produced by Spontaneous Parametric Down Conversion, in crystals with linearly chirped
quasi-phase matching grating. Wavepackets present very broad spectra but a broad spectrum does not necessarily
imply small correlation times, although the inverse is true. Indeed, the spectrum broadening induced by the
grating is inhomogeneous; for this reason, the two-photon spectral amplitude present a phase (a frequency chirp)
that depend nonlinearly on the frequency. Hence, the two-photon wavepackets are not Fourier transform-limited.
As suggested in, the ideal way to make the wavepacket perfectly transform limited is to insert in the path of
the biphotons a proper optical medium that compensates the non-linear part of the phase factor present in the
spectral amplitude. In our work, we investigate the non-local temporal compression of the photons induced
by the insertion of a standard optical fibre in the path of one of the two photons. We present and discuss a
systematic study of this phenomenon and some optimal situation where the full numerical calculation shows an
effect that can be clearly observed with a realistic set-up. The study has open the way to the practical realization
of this idea.
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The purpose of this paper is to investigate the scattering by a nonlinear crystal whose depth is about the wavelength
of the impinging field. More precisely, an infinite nonlinear slab is illuminated by an incident field which is the sum
of three plane waves of the same frequency, but with different propagation vectors and amplitudes, in such a way
that the resulting incident field is periodic. Moreover, the height of the slab is of the same order of the wavelength,
and therefore the so-called slowly varying envelope approximation cannot be used. In our approach we take into
account some retroactions of the scattered fields between them (for instance, we do not use the nondepletion of the
pump beam). As a result, a system of coupled nonlinear partial differential equations has to be solved. To do this,
the finite element method (FEM) associated with perfectly matched layers is well suited. Nevertheless, when using
the FEM, the sources have to be located in the meshed area, which is of course impossible when dealing with plane
waves. To get round this difficulty, the real incident field is simulated by a virtual field emitted by an appropriate
antenna located in the meshed domain and lying above the obstacle (here the slab).
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Periodic media offer impressive opportunities to manipulate the transport of classical waves namely light or sound.
Elastic waves can scatter light through the so-called acousto-optic interaction which is widely used to control
light in telecommunication systems and, additionally, the radiation pressure of light can generate elastic waves.
Concurrent control of both light and sound through simultaneous photonic-phononic, often called phoxonic, bandgap
structures is intended to advance both our understanding as well as our ability to manipulate light with
sound and vise versa. In particular co-localization of light and sound in phoxonic cavities could trigger nonlinear
absorption and emission processes and lead to enhanced acousto-optic effects. In the present communication,
we present our efforts towards the design of different phoxonic crystal architectures such as three-dimensional
metallodielectric structures, two-dimensional patterned silicon slabs and simple one-dimensional multilayers,
and provide optimum parameters for operation at telecom light and GHz sound. These structures can be used
to design phoxonic cavities and study the acousto-optic interaction of localized light and sound, or phoxonic
waveguides for tailored slow light-slow sound transport. We also discuss the acousto-optic interaction in onedimensional
multilayer structures and study the enhanced modulation of light by acoustic waves in a phoxonic
cavity, where a consistent interpretation of the physics of the interaction can be deduced from the time evolution
of the scattered optical field, under the influence of an acoustic wave.
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The performance advances in communication systems like Radar system, precision navigation, space application and
time and frequency metrology require more stable frequency and low phase noise system. Here is presented a
configuration of phase noise measurement system operating in X- band using a photonic delay line as a frequency
discriminator. This system doesn't need any excellent frequency reference and works for any frequency between 8.2 and
12.4 GHz. Using cross correlation on 500 averages, noise floor of the instrument is respectively -150 and -170 dBc/Hz at
101 and 104 Hz from the 10 GHz carrier (-90 and -170 dBc/Hz including 2 km delay lines). This instrument is developed
in the context of association with the national french metrology institute (laboratoire national de métrologie et d'essais,
LNE). This calibration system is to be integrated in measurements means of the accredited laboratory to improve the
Calibration Metrology Capabilities (CMC) of the LNE.
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The dynamics of an ionization and a recombination in an ultrastrong laser field is studied by ab initio numerical
simulations performed for a realistic atomic system in the regime of attosecond laser pulse duration. In particular the
stabilization phenomenon is studied, the presence of which is confirmed in 3D. We first describe the method of
integrating the Schrödinger equation (in general parabolic equations) which we adopt, taking advantage of the axial
symmetry of the studied system and uses the FFT and Chebyshev polynomials (FCP) method. Further we present its
implementation based on the CUDA technology to benefit from the power of graphics cards.
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We describe a parallel multi-threaded approach for high performance modelling of wide class of phenomena in
ultrafast nonlinear optics. Specific implementation has been performed using the highly parallel capabilities of
a programmable graphics processor.
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Wavelength tunable synchronous pulse sources are highly desirable for spectroscopy and optical diagnostics. The
common method to generate short pulses in the fiber is the use of nonlinear induced spectral broadening which result in
soliton shaping in anomalous dispersion regime. However, to generate ultra-short pulses, broadband gain mechanism is
also required. In recent years, Raman fiber lasers have retrieved strong interest due to their capability of serving as pump
sources in gain-flattened amplifiers for optical communication systems. The fixed-wavelength Raman lasers have been
widely studied in the last years, but recently, much focus has been on the multi wavelength tunable Raman fiber lasers
which generate output Stokes pulses in a broad wavelength range by so called cascaded stimulated Raman scattering. In
this paper we investigate synchronous 1st and 2nd order pulsed Raman lasers that can achieve frequency spacing of up to
1000cm-1 that is highly desired for CARS microscopy. In particular, analytical and numerical analysis of pulsed stability
derived for Raman lasers by using dispersion managed telecom fibers and pumped by 1530nm fiber lasers. We show the
evolution of the 1st and 2nd order Stokes signals at the output for different pump power and SMF length (determines the
net anomalous dispersion) combinations. We investigated the stability of dispersion managed synchronous Raman laser
up to second order both analytically and numerically. The results show that the stable 2nd order Raman Stokes pulses
with 0.04W to 0.1W peak power and 2ps to 3.5ps pulse width can be achieved in dispersion managed system.
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Erbium-doper fiber (EDF) is a flexible and promising model medium for investigation of the slow/fast light propagation
in saturable optical materials. The experiments are usually performed in the spectral range 1480-1570 nm of the
absorption/gain of Er3+ ions using the input power of a sub-mW scale. Conventional experimental configuration allows
one to observe, however, the input and the output pulse profiles only. We report an original nondestructive technique for
observation of a spatial propagation of the pulses via observation of the transient fluorescence excited by the propagating
light-pulses at the fiber side, from which we are able to reconstruct how does the fractional delay and the amplitude of
the propagating pulses change along the fiber. Results of a numerical simulation of the nonlinear pulse propagation
performed for a saturable two-level medium in low contrast approximation proved to be in a reasonable agreement with
the experimental observations.
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