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 20 for “"parametric amplification"”.
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Parametric amplification of mid-infrared picosecond radiation
High power, tunable, mid-infrared sources are important in many fields, like spectroscopy and medical applications. This thesis presents a technique for realising a high power tuneable mid-infrared picosecond source, by combining the radiation from a free electron laser with a powerful Nd:YAG pump …
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Optical-parametric-amplification applications to complex images
… processes of Polarization Gating and of Optical Parametric Amplification, one for measurement and the other for imaging purposes. For measurement, we have demonstrated a robust method of measurement to simultaneously measure both optical pulses used in a pump-probe type configuration. We refer to …
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Optical parametric amplification of optical imaging signals
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01
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Few-cycle and cavity-enhanced optical parametric amplification
Optical parametric amplifiers have emerged as important optical sources by extending the properties of few-cycle laser sources, which exist only in materials with sufficiently large gain bandwidths, to wide array of spectral ranges. The work reported in this thesis relates to two areas for the …
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An investigation of low audio-frequency parametric amplification
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1962.
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Kelių optinių ciklų trukmės impulsų parametrinis stiprinimas infraraudonojoje srityje /
… approaches were introduced for few cycle pulse parametric amplification at 800 nm and 1.5 μm. First approach is dedicated for prospects for increasing average power of OPCPA via multi-beam pumping; the second approach is dedicated for generation of carrier-envelope-phase (CEP) stable high energy …
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Microwave response of nonlinear oscillations in resistively shunted superconducting nanowires
… have promising applications in fields such as parametric amplification and frequency multiplexing.
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The Generation and Detection of Squeezed Microwave Photons Realized using Traveling-Wave Parametric Amplifiers
… In circuit quantum electrodynamics, Josephson parametric amplifiers play a crucial role in quantum-limited amplification and squeezed microwave generation. In this thesis, we develop a dual-pump, broadband Josephson traveling-wave parametric amplifier (JTWPA) to demonstrate non-degenerate …
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High intensity femtosecond enhancement cavities
… Usually such high intensity are obtained by parametric amplification of laser pulses, which in turn reduces the pulse repetition rate to a few kHz. Given that the HHG process is inherently inefficient, with conversion ratios less than 10-5, only a small fraction of the pulse energy is lost in …
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Laser-coupled scanning tunneling microscopy and spectroscopy of quantum materials and qubit defects
… first reported example of massive-to-massless parametric amplification of a collective sliding CDW phason mode. In this mechanism, the massive 0.22 THz phason yields two massless phasons at half frequency and with equal and opposite wavevectors, conserving energy and momentum. This parametric …
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Investigation of dual-pump fiber optical parametric amplifier using highly nonlinear dispersion shifted fiber
Using multi-pump Raman amplifier provides high parametric gain over wide bandwidth with low noise figure (NF). Contrary to Raman amplifiers (RA), fiber optical parametric amplifiers (FOPA) can provide high and flat parametric gain over a bandwidth of tens or hundreds of nanometers with low-noise …
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Squeezed states and quantum nondemolition measurements
… proposed to produce squeezed states; degenerate parametric oscillation, two photon absorption and dispersive optical bistability, is presented. It is shown in an exact, fully quantum treatment that the reduction of fluctuations obtainable in all these devices is limited, when operated in a steady …
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Controlling and probing nonlinear collective mode dynamics in quantum materials
… frequencies of the interacting modes. We achieve parametric amplification of magnon coherence by tuning the magnonic difference-frequency generation into resonance with a low-frequency magnon. Furthermore, by increasing the driving field strength to access a far-from-equilibrium regime, we uncover …
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Analysis and Experimental Investigation of Wave Propagation and Energy Transfer in Mechanical Rotator Metamaterials
… steering, on-demand signal time delay, and parametric amplification. Additionally, closed-form perturbation analyses are introduced for two specific cases: nonlinear evanescent waves and nonlinear transmission at the interface of linear-nonlinear periodic structures. The study of nonlinear …
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Quantum nonlinear optics: applications to quantum metrology, imaging, and information
… of single photons via the process of spontaneous parametric down conversion (SPDC). This process is mediated by the second order nonlinear susceptibility of the material. When pumped in a high gain regime, these crystals give rise to optical parametric amplification, which is a viable source of …
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Breaking the Cycle: the Rise and Fall of Conversion Cycle Limited Three-Wave Mixing
… 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 of OPA results in asynchronous …
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Novel radio frequency applications and automated characterisation of silicon quantum dots
… dots as novel circuit components, such as parametric amplification, frequency mixers and multipliers, and charge sensors. In particular, the development of new quantum dot architectures where such circuit components are co-integrated with qubits. Operating such complex arrays will require …
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Aufbau eines 500 Hz-Lasersystems zur Summenfrequenzschwingungsspektroskopie
… with a pulse frequency of 500 Hz, and on optical parametric generator/amplifier system for the generation of tunable picosecond pulses in the medium infrared. Laser pulses at 1.064 µm with 0.9 mJ pulse energy and about 25 ps pulse duration are produced by regenerative amplification of picosecond …
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Wave Engineering in Time Modulated, Nonlinear, and Anisotropic Metamaterials
… demonstration of a single unit cell of parametric frequency divider-by-3 that enable phase tri-stability– an important feature needed to realize computational platform for combinatorial optimization problems. Extending RF modulation schemes to optical frequencies is hindered by current …