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We present a theoretical study of the extinction properties of spherical metal-dielectric-metal layered structures. Our analysis shows tunable absorption and transparency, as well as possible left-handed behavior in the visible spectral range.
We demonstrate surface plasmon guiding by dielectric nanowaveguides on top of a metal film. Based on this technique, the scale of dielectric waveguide devices can be shrunk by at least an order of magnitude.
We report high transmission through SiC films when a two-dimensional periodic arrangement of subwavelength cylindrical holes is made. We attribute the near-perfect transmission peak inside the polariton gap of SiC to propagating waveguide modes.
Positive thermal lens in optical element (Faraday isolator in our case) produced by absorption of high power radiation was experimentally compensated with negative thermal lens in DKDP sample self-adaptive to different radiation powers.
We have measured thermal conductivity of Y3Al5O12, GdVO4, and YVO4. It was found that YVO4 has larger thermal conductivity than GdVO4. Nd3+-doping effect in thermal conductivity and thermal expansion ratio have been also discussed.
Thermal lens spectroscopy intra-cavity under laser operation at 1340 and 1064 nm were applied to Nd:YAG crystals in order to determine heat spectra and accurate values of fluorescence quantum efficiency, ds/dT, and dioptric power.
The Z-scan and Thermal Lens techniques have been used to obtain the Auger upconversion parameter in Nd3+-doped materials. A comparison between these methods is done, showing that they are independent and provide similar results.
Stimulated-Brillouin-Scattering (SBS) provides passive Q-switching of a Nd:YAG-laser. Mode-coupling was actively supported by an AOM. Numerical simulations based on spectrally resolved rate equations including SBS-Stokes-shift and mode-locking explain special spectral features of this laser.
Stress-induced birefringence in a single-transverse-mode YAG laser is well compensated simply by having the end mirror one Rayleigh range away from the gain.
New geometry for edge-pumping composite solid-state microchip laser suitable for high power scaling is presented. Yb:YAG/YAG composite device with 200-mum thick 15-at.% Yb:YAG of 3.6-mm diameter produced on-time 34 W output power with 0.26 slope efficiency.
An atom interferometer-based gravity gradiometer is being developed for subsurface mapping and geodesy, and fundamental physics investigations from space. We report on this design effort along with the details of the current laboratory-based instrument.
We report a compact, narrow-line intracavity OPO with a grazing-incidence grating. This kHz pulsed OPO fits into a 25 times 25 cm area, generating 30 muJ/pulse at 1560 nm with a linewidth of 0.8 cm-1.
The optical properties of rare earth doped silver halide crystals were studied in the middle infrared spectral range. The results indicate that these materials are promising candidates for development of mid-IR fiber lasers and amplifiers.
We simulate an evolutionary process for designing a novel high confinement photonic structure, starting with random patterns. We show an emergence of periodicity and the formation of a novel low modal volume resonator.
A simple first-principle analytical derivation of the permanent matrix elements of the dipole moment responsible for most of the resonant nonlinearities in III-V and II-VI semiconductors is presented.
Stimulated emission, in strong coupling regime, in a one dimensional photonic crystals is described by considering two counter-propagating pumps. Quasi normal mode approach is used and coherent control of the Rabi splitting is discussed.
SiGeC alloys are used to realize high performance compact integrated photonic devices, such as electro-optic modulators and photodetectors, on Silicon at near-IR wavelengths with performances that exceed those of conventional designs.
A table-top lambda = 13.2 nm soft X-ray laser operating at 5 Hertz repetition rate with 1 muW average power was demonstrated in Ni-like Cd. Lasing down to 10.9 nm was also obtained in transitions of other Ni-like ions.
Complete cancellation of polarization dependency using a lambda/2-shifted Sagnac loop interferometer is quantitatively characterized for a number of commercial-graded transmission-type optical devices, such as in-line polarizer and variable optical attenuator.
We demonstrate rectangular optical pulse generation from short input pulses by using a highly reflective unchirped fiber Bragg grating (FBG) with a simple structure. ~18-ps rectangular pulses are generated successfully from ~3-ps input optical pulses.
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