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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Photonic crystal fiber."”.
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Photoacoustic photonic crystal fiber gas sensor
… acoustic resonator. In recent times, hollow-core photonic crystal fiber (HC-PCF) has emerged as superior gas cell for standard absorption-based laser spectroscopy due to its small size, compatibility with fiber-based optical components, and easily attainable long light-gas interaction path …
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Novel approaches to power scaling of single-frequency photonic crystal fiber amplifiers
… of high power, single-frequency, ytterbium-doped photonic crystal fiber amplifiers. The objective of this effort is to identify issues which limit power scaling and develop novel techniques to overcome these limitations. Historically, stimulated Brillouin scattering (SBS) has been the primary …
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Fibra de crital fotônico: fundamentação e aplicações
… consists of the study and analysis of the PBG (Photonic Band Gap )..tecnology incorporated in optical fiber structures. So, we'l1 present a complete PBG structure theory, and folowing this, we'l1 present also a chapter for convencional optical fiber, due to the need to construct the base theory …
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Single Crystal Sapphire Photonic Crystal Fibers
A single crystal sapphire optical fiber has been developed with an optical cladding that is used to reduce the number of modes that propagate in the fiber. This fiber is the first single crystal sapphire photonic crystal fiber ever produced. Fabrication of the optical cladding reduces the number of …
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Dispersion-managed Breathing-mode Semiconductor Mode-locked Ring Laser
… trends such as continuum generation via a photonic crystal fiber, two-photon fluorescence imaging, and ultrafast pulse source for pump-probe experiments are demonstrated.
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Quantum nonlinear optics using cold atomic ensembles
… loading ensembles of cold atoms in a hollow-core photonic crystal fiber to enhance the polariton-photon interactions. In our second approach, the photons are coupled to strongly interacting Rydberg atoms, which mediate large interactions between single quanta of light. Moreover, the intrinsic …
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Development of Broadband Time-Resolved Spectroscopy and Investigation of the Dynamics of Photoexcited Carriers and Lattice Excitations in Chiral Weyl Semimetals
… probe technique based upon a nonlinear photonic crystal fiber and a digital micro-mirror device enabling the use of single element detector and lock-in demodulation of the signal, along with rapid, repeated averaging over the spectrum. Using a bismuth test sample, we demonstrate that the …
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Next generation optical communications for satellites
… a selection of double-clad ErYb-doped fibers are tested to select the most suitable fiber for use within future high-power applications.With a new set of parts tested, the thesis turns towards novel module development. The first module presented is a technology readiness level 5/6 …
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Developing Single-Laser Sources for Multimodal Coherent Anti-Stokes Raman Scattering Microscopy
… using a single Ti:sapphire oscillator with a photonic crystal fiber, it is possible to develop a versatile multimodal imaging system using optimally chirped laser pulses. This system can perform simultaneous two photon excited fluorescence, second harmonic generation, and CARS microscopy. The …
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Continuous-wave cavity ring down spectroscopy sensor for Hall thruster erosion measurement
… lines of boron (250 nm) with CW-CRDS. A photonic crystal fiber was used to couple the ultraviolet laser light to the cavity within the vacuum chamber. The experimental detection limits and signal-to-noise values show potential for Hall thruster BN erosion studies. Finally, the velocity …
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Liquid Crystal Materials And Tunable Devices For Optical Communications
In this dissertation, liquid crystal materials and devices are investigated in meeting the challenges for photonics and communications applications. The first part deals with polymer-stabilized liquid crystal (PSLC) materials and devices. Three polymer-stabilized liquid crystal systems are …
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Optical nonlinear effects and photon pair production in modulated materials
… velocity dispersion (GVD) is modulated along a photonic crystal fiber. Measurements of the temporal correlations between the newly generated frequencies is presented with a coincident to accidental ratio (CAR) of 7.5: yielding proof of a quantum correlation between the generated photon pairs.
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Acetylene-filled pressure broadened short photonic microcells
We have developed short acetylene-filled photonic microcells (PMCs’) as optical frequency references in the near infrared region for applications in telecommunication, gas sensing, and metrology. The PMC is a 5-10 cm long hollow-core photonic crystal fiber (HC-PCF) in which the high pressure …
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Power scaling and nonlinear conversion in fiber-based sources at novel wavelengths
Power-scaling of fiber-based laser sources is an attractive research area as they can enable numerous different applications in medicine, industry, and defense security due to their high spatial beam quality, compact size, and robustness. Energy scaling of silica-based fiber sources is limited to …
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Advanced light manipulation and waveguiding in plasmonic nanostructured optical fibers.
Conventional optical fibers are well-known for their efficient light guiding mechanism. However, the dielectric properties of core and cladding materials (e.g.- doped silica and silica glasses) limit the functionality of the optical fibers. Therefore, the optical properties of the fibers, such as …
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Using saturated absorption spectroscopy on acetylene-filled hollow-core fibers for absolute frequency measurements
… to date have occurred in free-space. Hollow-core photonic crystal fibers offer a potential alternative to free-space setups through their small cores (~10’s of µm) and low-loss guidance. Furthermore, HC-PCF can be made into fiber cells that could be directly integrated into existing …
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Protein Biophysics in Hollow-Core Photonic Crystal Fibres: Label-Free Monitoring of Biomolecules in Optofluidic Waveguides
… dissertation, we study the use of hollow-core photonic crystal fibre (HC-PCF), a class of optofluidic waveguides, to optically detect and monitor proteins in microfluidic environments without labels. Within this waveguiding microfluidic fibre geometry, we monitor the label-free optical …