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 8 of 8 for “"picosecond pulse"”.
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Plonasluoksnių saulės elementų apdirbimas ultratrumpais lazerių impulsais /
… theoretical analysis of thin layer ultrashort pulsed laser ablation processes for photovoltaic devices. Experimental work was supported by modeling and simulation of energy coupling and dissipation inside the layers. The absorbed laser energy was transformed to localized transient heating …
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Investigation of selective optical properties of Si/SiO2 nanostructures generated by pulsed laser ablation as-deposited and post-treated
… nanofibrous thin films are studied. A picosecond pulse laser was employed for indirect deposition of ablated silicon on glass substrates. Prominent parameters such as laser power, repetition rate, pulse duration, and scanning speed were changed to vary the structural and compositional …
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All-optical signal processing using cascaded quadratic interactions in periodically poled lithium niobate waveguides
… relies on the generation of linearly chirped pulses which are then optically switched with data pulses using cSHG/DFG in a PPLN waveguide, is demonstrated. Signal regeneration techniques exploiting cascaded quadratic nonlinearities in PPLN waveguides are also investigated. An all-optical …
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Addition and recombination reactions of unsaturated radicals using a novel laser kinetics spectrometer
… laser kinetics spectrometer. A quasi-CW (picosecond pulse), tunable Ti:Sapphire laser is used to detect various transient species in laser flash photolysis kinetics experiments via direct absorption. The spectral range of the laser, when used with a harmonic generator, covers most of the …
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Theoretical and Experimental Investigation of the Nonlinear Dynamical Trends of Passively Mode-Locked Quantum Dot Lasers
… great promise as compact, efficient and reliable pulsed sources of light for a range of precision and high performance applications, such as high bit-rate optical communications, diverse waveform generation, metrology, and clock distribution in high-performance computing (HPC) processors. For such …
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Broadband Terahertz Signal Generation and Radiation Based on Direct Digital-to-Impulse Radiating Arrays in Silicon
… for security purposes. Conventional terahertz pulse generation techniques are based on the optical excitation of a III-V photoconductive antenna with a femtosecond optical laser pulse. This method of THz pulse generation and detection is widely used in THz time-domain spectroscopy systems. …
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Nonlinear Applications using Silicon Nanophotonic Wires
… on the propagation of ultra-short optical pulses in such wires. I show that silicon nanophotonic wires possess a remarkably large characteristic time associated with the self-steepening effect and optical-shock formation. In Chapter 4, I present an experimental demonstration of an ultrafast …
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Quantum dot based semiconductor disk lasers
… in the first such type of laser with sub-picosecond pulse widths. Pulses with duration of 870 fs at a repetition rate of 896 MHz and wavelength of 1028.5 nm were demonstrated. Pulses were 1.14 times Fourier limited and an average output power of 46 mW was achieved. Finally, quantum well …