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 206 for “"Linewidth"”.
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Ultra-Narrow Laser Linewidth Measurement
… interferometer (LC-RDSHI) for ultra-narrow linewidth measurement, including the theoretical analysis, experimental implementation, further modification on the system and more applications. Recently, less than 1kHz linewidth fiber lasers have been commercialized. But even the manufacturers …
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Coherent control of Rydberg atoms using sub-kHz linewidth excitation lasers
… providing long-term stability and sub-kHz linewidth lasers with a tunable offset-lock frequency as required for high fidelity quantum operations. High-resolution spectroscopy on a cloud of cold Cs atoms was achieved using electromagnetically induced transparency (EIT), in order to calibrate …
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A narrow linewidth diode laser system for strontium laser cooling applications
… and characterization of this system, including a linewidth measurement of 70 kHz, as well as preliminary results from cooling and trapping.
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Fabrication and performance of broad-area high power narrow linewidth semiconductor laser diodes
… the reflectivity, and the laser emission linewidth resulting from a refractive index grating are predicted. A comparison is made between lasers with coated and uncoated facets, demonstrating that the impact of DFB gratings is enhanced by facet coating. Both surface-etched and epitaxially …
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A Narrow-Linewidth Laser at 1550 nm Using the Pound-Drever-Hall Stabilization Technique
Linewidth is a measure of the frequency stability of any kind of oscillator, and it is a defining characteristic of coherent lasers. Narrow linewidth laser technology, particularly in the field of fiber-based infrared lasers, has progressed to the point where highly stable sources are commercially …
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Pivot-Point-Independent Mode-Hop-Free Tunable Laser with a Large Tuning Range and Narrow Linewidth
… combination of a broad tuning range and narrow linewidth, which is unmatchable by other tunable laser configurations. The Littrow/Littman configuration, which employs a diffraction grating to achieve precise control of the lasing wavelength, is highly regarded for its superior tuning accuracy …
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Model-based spectral inference in noisy physical time series: applications in laser linewidth estimation and precision magnetometry
… Two distinct experimental settings – narrow-linewidth semiconductor lasers and spin-precession-based magnetometry – pose inverse problems that traditional methods struggle with due to low signal-to- noise ratios, nonstationary dynamics, and convolutional measurement effects. Spectral …
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Development, characterisation and analysis of narrow linewidth, single-frequency DFB fibre lasers in the 1.5 µm - 2 µm region
… of this study was to investigate the anomalous linewidth behaviour of the DFB fibre lasers, as the observed linewidths of these lasers remain far above their predicted theoretical limit based on the Schawlow-Townes linewidth formula. Narrow linewidth, single-frequency fibre lasers are attractive …
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Wavelength dependence of the spectral linewidth of a grating-tuned CW single-frequency external-cavity strained quantum well InGaAs/AlGaAs Grinsch diode laser
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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Adaptation of VT-Dbr Lasers for LIDAR
… with a VT-DBR laser, the laser must have a linewidth less than 1MHz over a tuning range of around 10GHz. This thesis outlines two methods towards this goal. The bulk of this work is dedicated to looking for and characterizing VT-DBR tuning paths with fundamentally narrow linewidth using …
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Single frequency semiconductor lasers
… and spectroscopy. In communications, narrow linewidth is desirable to minimize dispersion effects and low cross-talk multiple wavelength channels on a single fiber. For GaAs-based lasers, the interest in narrow linewidth sources comes from the spectroscopy community that desires a light …
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The Mechanism of Chloride Activation of Oxygen Evolution in Spinach Photosystem Ii
… The $\sp{35}{\rm Cl}$-NMR binding curve (excess linewidth vs. (${\rm Cl}\sp-$)) for ${\rm Cl}\sp-$ depleted thylakoids and PS II membranes is not a smoothly descending hyperbola. Instead, this curve shows four sharp increases in linewidth (linewidth maxima) in the concentration range 0.1-10 mM …
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Understanding colloidal quantum dot excitation with solution photon correlation fourier spectroscopy
… a solution. With S-PCFS, the intrinsic emission linewidth of CQDs can be assessed. This linewidth information is related to phonon coupling and gives insight into the separation of holes and electrons in excited CQDs. Experimental considerations and recommendations for troubleshooting a S-PCFS …
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Search for the Mössbauer Effect in 109Ag
… lifetime of 57.1 sec and a corresponding natural linewidth of 1.15 x 10<sup>-1</sup>7 eV which is nearly six orders of magnitude narrower than the width for the 93-keV 13.2-μsec state in <sup>67</sup>Zn. The 93-keV transition in <sup>67</sup>Zn has the narrowest linewidth for which the Mossbauer …
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Backward stimulated raman scattering
… A new prediction is made for the steady state linewidth of the forward Stokes output in the presence of a depleted pump. The theory is developed with the aim of gaining an understanding of the mechanism which favours stimulated Raman output in the backward direction. The experimental …
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Laser Frequency Stabilization With Pound-Drever-Hall Technique
… the system can significantly reduce the linewidth of an input laser with an un-stabilized linewidth. It uses a high-finesse Fabry-Perot cavity, which is mechanically and thermally isolated, as a frequency reference to measure the time-varying frequency of the input laser. An electronic …
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External control of semiconductor nanostructure lasers
… for high differential gain and modified linewidth enhancement factor. However, there are known intrinsic limitations associated with semiconductor laser dynamics that can hinder the performance including the mode stability, spectral linewidth, and direct modulation capabilities. One …
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Fabrication of silicon-based nano-structures and their scaling effects on mechanical and electrical properties
… rectangular cross sections and highly uniform linewidth at the nanometer scale. To characterize mechanical properties, an atomic force microscope (AFM) based nanoindentation system was employed to investigate three sets of silicon nanolines. The SiNLs had the linewidth ranging from 24 nm to 90 …
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The Galaxy Velocity Function from MIGHTEE-HI Early Science Data
… the Busy Function are employed to estimate the linewidths of the low spectral resolution data. The performance of PYMULTINEST in estimating known linewidths of simulated H I profiles with varying spectral resolution is assessed. The simulation study shows that the estimated linewidths of the …
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Spontaneous brillouin scattering quench diagnostics for large superconducting magnets
… fiber. Using an extremely narrow (200 Hz) linewidth Brillouin laser with very low noise as a frequency shifted local oscillator, the frequency shift of spontaneous Brillouin scattered light was measured using heterodyne detection. A pulsed laser was used to probe the fiber using Optical …
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