Global ETD Search
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 20 of 27 for “"frequency doubling"”.
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Nonlinear optics for frequency-doubling in nanosatellite laser communication
… we assess the utility of nonlinear optics for frequency-doubling to enable free space optical (FSO) communication links to take advantage of the ability to switch between two wavelengths using one transmit module. Our analysis shows that incorporating frequency-doubling with nonlinear optics …
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Ring oscillator based injection locked clock multiplier
… designed with the goal of generating a high-frequency and low-jitter clock. Building on prior research done on injection locking, this design uses a reference frequency doubling technique to push the noise bandwidth of the circuit to Fref/3 to suppress DCO noise to a large extent. A …
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Chemical evolution, heteroepitaxy, and monolayer patterning of solution-derived lithium niobate thin layers
… thin films are of technical interest for frequency doubling and a variety of efficient photonic circuit element applications. Solution deposition of such films on near lattice-matched substrates has been conducted, allowing low temperature processing, stoichiometry control, doping …
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CMOS Receiver Design for Optical Communications over the Data-Rate of 20 Gb/s
… at the input and yielding higher input pole frequency. It also allows removal of input inductor, which reduces design complexity. The proposed circuit was designed and fabricated in 32 nm CMOS SOI technology. Compared to TIAs which mostly operates at 50 GHz bandwidth or lower, the presented …
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An overview of laser operation and modelocking of a vertical external cavity surface emitting laser (VECSEL)
… diffraction limited beam quality, intra-cavity frequency doubling, tunability, and ultrashort pulses generated from passive mode-locking. In this work, we give a brief overview of the VECSEL structure, previous VECSEL literature, how lasing in a VECSEL works, and how mode locking in a VECSEL …
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461nm laser for studies in ultracold neutral strontium
… laser, via second harmonic generation in a frequency doubling cavity using a potassium niobate crystal. This thesis will discuss the motivation, optical resonator, locking electronics, and characterization of a 461 nm laser.
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A laser system for trapping and cooling of ⁶Li atoms
… use of a Raman Fiber Amplifier coupled with a Frequency Doubling Cavity and shows the finalized setup. Finally, the thesis delves into the topic of Modulation Transfer Spectroscopy which was used to lock the laser to the D₂ line transition of ⁶Li and shows the spectroscopy setup built for the …
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An experimental analysis of an impedance pump as a model for segmentation in the intestine
… The system was found to have a natural frequency near 1.69 Hz and exhibited frequency doubling. The dimensionless pressure and time responses showed a complicated pressure response that decreased in overall magnitude with increasing compression frequencies. The response is influenced by …
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Development of non-linear waveguide devices for optical signal processing
… Poling of glass has drawn much attention because frequency conversion and electro-optic modulation, operations which are typically restricted to crystals, becomes feasible in glass fibres and waveguides which are widely spread media in photonics thanks to their excellent optical properties and …
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Advanced high-power pulsed fibre laser systems and their applications
… power femtosecond pulse generation and nonlinear frequency conversion. While the power produced by rare-earth doped fibre lasers operating in continuous-wave has dramatically increased within a few years to exceed the kilowatt level, pulsed fibre sources have been limited to tens of watts due to …
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Optical tweezers for signal detection and micromanipulation
… second harmonic light, generated via a frequency doubling crystal, for the excitation of the SERRS signal. In addition to trapping single particles, a spatial light modulator (SLM) was introduced into the optical tweezers to produce holographic optical tweezers. The SLM allowed the …
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Novel semiconductor based broadly tunable light sources
… technologies, in particular nonlinear frequency conversion and parametric sources, have led to the realisation of a new generation of laser sources. Furthermore, the advent of a new generation of quasi-phase-matched, waveguided and semiconductor nonlinear materials together with novel …
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Machining-induced damage mechanisms in KDP crystals
… fields, including optical uniformity, laser frequency conversion, high-speed Q-switching, because KDP possesses excellent physical properties, such as superior photoelectric/piezoelectric capability, outstanding frequency-doubling effect and high nonlinear conversion efficiency. In …
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Novel ground states of Bose-condensed gases
… shown to be coherent - the matter wave analog to frequency doubling in optics. In addition, the more general process of sum-frequency generation was demonstrated.
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Novel active waveguide devices in direct-bonded structures
… planar waveguide buried in LiTaO<sub>3</sub>. Frequency doubling experiments performed with this device demonstrate a conversion efficiency of 4.3 %W<sup>-1</sup>, a value 40% greater than that calculated for an optimised bulk device of similar length.<br/>Also demonstrated is a photorefractive …
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Synthesis, non-linear optical and electrochemical properties of novel organoimido polyoxometalate derivatives
… experimental measurements of 2nd order NLO (frequency doubling) coefficients (β) (by hyper-Rayleigh scattering, HRS) and the first spectroelectrochemical measurements on such species. Towards the aim of producing practical miniaturized devices, the species characterised include systems …
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Femtosecond optical parametric oscillators for the mid-infrared
… were sub-100 fs, and essentially free from frequency chirp. With appropriate dispersion compensation the near-infrared signal pulses were temporally compressed to 69 fs. Theoretical models of noncollinear phasematching were derived and the results agreed closely with experiment. A novel …
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Visual correlates of functional difficulties in Parkinson's disease and Alzheimer's disease
… (Optical Coherence Tomography) and function (Frequency Doubling Technology; FDT) across the eye. Correlations of structure and function were found for all groups. LPD showed predicted downward bisection bias in some sections of the left visual field. Expected rightward bisection bias in LPD …
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Effects of Laser Frequency and Multiple Beams on Hot Electron Generation in Fast Ignition
… simulations are used to examine the effects of frequency doubling and tripling of a 1 μm laser as well as effects of using various dual-beam configurations. While the hot-electron energy spectrum is indeed shifted closer to the few-MeV range for higher frequency beams, the overall energy …
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Advanced high-power optical parametric oscillators synchronously pumped by ultrafast fibre-based sources
… (idler) are typical for both OPOs. Including frequency-doubling of the 1060 nm light, the first pump source, operating at 230MHz and 20ps, is used for two green-pumped OPOs tunable in the near-infrared range from 650 nm to 1040nm (plus the idler from 1.08µm to 2.9µm). The first OPO uses …
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