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.
Results
Showing 1 to 18 of 18 for “"idler"”.
-
Breaking the Cycle: the Rise and Fall of Conversion Cycle Limited Three-Wave Mixing
… exchange of energy between the pump, signal, and idler fields that characterizes optical parametric amplification (OPA) places a fundamental limitation on efficiency for Gaussian-shaped beam and pulse profiles typical of real laser sources. This is because the intensity dependent conversion period …
-
Generation of fiber-coupled, nondegenerate, polarization-entangled photons for quantum communication
… laser to generate 798 nm signal and 1.6 tim idler photon pairs in periodically-poled, congruent lithium niobate (PPLN). Difference frequency generation of 798 nm is used for characterizing PPLN, including phase matching bandwidth and effective nonlinear coefficient. Optimal focusing for …
-
Advanced high-power optical parametric oscillators synchronously pumped by ultrafast fibre-based sources
… powers of up to 7.3W (3.1W) for the signal (idler) are generated at variable repetition rates of ~0.1 . . . 1GHz. With longer 100ps pump pulses at a repetition rate of < 8MHz and an intracavity fibre as an OPO feedback component for compactness, combined pulse energies approaching 1µJ are …
-
Target detection through quantum illumination
… (QI). Nondegenerate, time entangled signal and idler beams are created through Type-O spontaneous parametric downconversion (SPDC). The signal is attenuated and combined with large levels of noise. The signal is phase modulated to improve the observation by shifting it from DC to 16 kHz. The …
-
Mechanical development of an actuation system for a parabolic solar trough collector
… in-depth analysis into two of them, the idler pulley scheme was chosen. This mechanism uses a double rod end hydraulic actuator connected to wire rope wrapped around a capstan drum and an idler pulley. The model was optimized for mechanical performance, and it is expected to be a more …
-
Multimode Microresonator Optical Frequency Combs
… leads to the formation of a secondary idler comb whose frequency components possess exactly the same line-spacing as, yet are spectrally offset from, the original soliton comb. By adjusting the relative detuning between the two driving lasers; the position of this idler comb can be …
-
Nonlinear Dynamics and Vibration of Gear and Bearing Systems using A Finite Element/Contact Mechanics Model and A Hybrid Analytical-Computational Model
… systems, including spur and helical gear pairs, idler gear trains, and planetary gears. The spur gear pairs are analyzed using a finite element/contact mechanics (FE/CM) model. A hybrid analytical-computational (HAC) model is proposed for nonlinear gear dynamics. The HAC predictions are compared …
-
Conceptual Design and Simulation of An Inverted Pendulum Wheelchair
… ball through four rollers (two driven and two idler) successfully. Thus the new wheelchair concept based upon the dynamic and control of spherical inverted pendulum has the potential to offer improved mobility compared with existing wheelchairs in the market place.
-
Generation and characterization of spectrally factorable biphotons
… the indistinguishability of the SPDC signal and idler photons via Hong-Ou-Mandel interferometric measurements. The near perfect interference visibility confirms that they are indeed indistinguishable.
-
Untersuchungen zur zellulären und humoralen Immunantwort gegen das Merozoitenoberflächenprotein-1 des Malariaerregers Plasmodium falciparum
Malaria ist mit geschätzten 300-500 Millionen klinischen Fällen jährlich eine der bedrohlichsten Infektionskrankheiten der heutigen Welt. Die Ursache der lebensbedrohlichen Form der Malaria, der Malaria tropica, ist der einzellige Parasit, Plasmodium falciparum. Die Entwicklung eines Impfstoffes …
-
Ultrafast sources of entangled photons for quantum information processing
… was achieved for broadband signal and idler photons at ~1.58 [mu]m. We also developed a novel time domain characterization technique based on time-resolved single-photon upconversion. Using this technique, we measured the joint temporal density of a two-photon state for the first time …
-
Femtosecond optical parametric oscillators for the mid-infrared
… in the signal branch and 1.67 to 4.55 mum in the idler branch, from a combination of grating, pump wavelength and cavity length tuning. A theoretical model indicated that a very broad gain bandwidth allowed the wide tuning range. An attractively low oscillation threshold of 45 mW was recorded, and …
-
Adaptively shaped advanced ultrafast laser sources
… optical gating is also studied as the method of idler pulse characterisation and the advantages and disadvantages compared to the sonogram technique are discussed.<br/><br/>Finally, the two technologies of an adaptively shaped ultrafast fibre CPA system and the pulse shape transfer in a SPOPO are …
-
Regulating transcript fate through RNA elements in the 3' untranslated region
Regulation of protein production is the most vital part of molecular biology. Typically the focus of such endeavors has been on the regulation of transcription, but increasingly there has been a concentration on the post-transcriptional regulation of mRNAs via miRNAs, other small RNAs, and RNA …
-
Design, microfabrication and characterisation of Photonic Integrated Circuits
… insertion loss for the propagating signal and idler of only 1.8 dB.The realisation of a microprocessor feedback loop stabilisation system integrated with SOI non-linear structures is also demonstrated. The system is based on a local thermal heater element on-chip used to stabilise the PICs …
-
Efficient and coherent frequency conversions and nonlinear interference in optical parametric and atomic Raman processes
… frequency down-conversion from pump photons to idler photons can be a coherent process. Contrary to a common misconception, we show that the process can be free of quantum noise. With an interference experiment, we demonstrate that coherence is preserved in the conversion process. This technique …
-
Silicon Photonics for All-Optical Processing and High-Bandwidth-Density Interconnects
… the conversion process for a wide range of probe-idler detuning settings, showcasing the silicon platform's unique broadband phase matching properties. The sixth chapter presents a slight shift in motivation for parametric processing from traditional telecom-wavelength applications to …
-
Stavba 3D tiskárny
Práce se zaměřuje na problematiku FDM 3D tisku. Část práce se věnuje vzniku a historii FDM 3D tisku. Porovnává jednotlivé typy FDM 3D tiskáren, jejich rozdílné konstrukce a popisuje jejich výhody a nevýhody. Dále se věnuje nejdůležitějším součástem každé FDM 3D tiskárny a popisuje nejběžnější …