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 41 for “"Narrow linewidth"”.
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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 …
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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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Single frequency semiconductor lasers
… systems 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 …
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Integrated erbium lasers in silicon photonics
… laser design for high output power and ultra-narrow linewidth performance. Using a novel wavelength-insensitive design, a CMOS compatible waveguide structure is proposed to achieve high confinement factor and intensity overlap for both the pump (980 nm) and signal (1550 nm) wavelengths. Laser …
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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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Development of high power fibre amplifier components, systems and applications
… a fibre Raman amplifier which amplified a 10mW narrow linewidth DFB laser at 1651nm to an output power of over 2W. To achieve this high output power from a narrow linewidth Raman amplifier mechanisms to suppress stimulated Brillouin scattering had to be employed. This amplifier system was …
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Fabrication and measurements of surface-etched grating distributed Bragg reflector laser
… Bragg reflector (DBR) laser is used to make a narrow linewidth laser. The thesis discusses semiconductor lasers that use surface-etched DBR along with the physics of both the semiconductor and the DBR laser. The topics addressed are the fabrication of the broad area laser, ridge waveguide …
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STIMULATED BRILLOUIN SCATTERING SUPPRESSION VIA TEMPERATURE GRADIENTS IN FIBER AMPLIFIERS
A method of improving the output power of a 177W narrow linewidth polarization maintaining ytterbium doped fiber amplifier is explored. The limiting factor, Stimulated Brillouin Scattering (SBS), is suppressed with a single-step temperature gradient. A similar fiber amplifier to the 177W amplifier …
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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 …
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Photoassociative ionization in cold rubidium
… pathways for the process are explored in both narrow linewidth (MHz) and ultrafast (fs), large bandwidth (20 nm) domains.
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A study of periodic gratings in planar dielectric waveguides
… multiplexing applications and as end mirrors for narrow linewidth lasers. A study of the spectral characteristics of both single and double gratings in planar dielectric waveguides is presented. The analysis of light propagation in a planar dielectric waveguide with sinusoidal boundary …
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Wavelength swept spectrally encoded confocal microscopy for biological and clinical applications
… provided high output power (> 10mrW), narrow linewidth (10GHz), broad wavelength tuning (80 nm centered at 1310 nm) and fast repetition rates (up to 16,000 Hz), while being compact and environmentally stable. Imaging with a wavelength swept SECM system was characterized by coupling the …
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Engineering J-aggregate cavity exciton-polariton devices
… a promising materials platform thanks to their narrow linewidth and high oscillator strength at room temperature, properties resulting from delocalization of excitations across multiple strongly-coupled molecules. By placing these films in an optical microcavity, the aggregates exhibit …
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High-power deep-UV laser for improved and novel experiments on hydrogen
… These systems initially lacked sufficiently narrow spectral bandwidth for efficient harmonic generation, motivating further development since there is significant interest in frequency doubling and quadrupling these sources to produce coherent blue radiation and deep-UV radiation. Here, we …
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Development of bismuth doped silica fibres for high power sources & long wavelength generation from ytterbium doped fibre lasers
… was also examined. <br/><br/>An all-fibre, narrow-linewidth, high power Yb-doped silica fibre laser at 1179 nm has been demonstrated. Furthermore, theoretical work confirms that the proposed laser architecture can be easily scaled to higher power.
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Metal-cavity surface-emitting nanolasers
… characteristics have been observed such as ultra-narrow linewidth, low thermal impedance, and circular beam shapes. The devices proposed and realized are substrate-free with transferability to other platforms. The size of the proposed structure can be further reduced without severe degradation in …
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High-power operation of interferometric gravitational-wave detectors
… and characterization of a high-power, narrow-linewidth ytterbium-doped fiber amplifier for use in future gravitational-wave detectors.
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