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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 60 for “"External cavity"”.
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External cavity laser label-free biosensor
… crystal resonant reflector as a mirror of an external cavity laser, we demonstrate a new type of label-free optical biosensor that achieves a high quality factor through the process of stimulated emission, while at the same time providing high sensitivity, large dynamic range and simple …
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Optically tunable external cavity ring laser
… characterization of a novel optically tunable external cavity ring laser is described here. The external cavity laser (ECL) utilizes a semiconductor optical amplifier as the gain medium in a ring configuration, and a surface photonic crystal incorporating a superstrate layer of an azobenzene …
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Pivot point independent, external cavity tunable laser
An investigation in to a novel pivot point free external cavity tunable laser (PPI ECTL). Existing external cavity tunable lasers are constructed using tunable optics, such as Bragg gratings to manipulate the cavity length. These elements although functional provide instability with prolonged use …
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Porous photonic crystal external cavity laser biosensor
Embargo set by: Colleen Fallaw for item 102812 Lift date: 2019-08-10T21:27:21Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system
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External cavity laser biosensor for label-free detection
… In this work, we demonstrate a dual-mode external cavity laser (ECL) biosensor to address the desired needs. The utilization of photonic crystal resonant reflector biosensor as mode-selection filter enables high sensitivity, while the stimulated emission process in the laser cavity …
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External Cavity Multiwavelength Semiconductor Mode-locked Laser Gain Dynamics
External cavity semiconductor mode-locked lasers can produce pulses of a few picoseconds. The pulses from these lasers are inherently chirped with a predominant linear chirp component that can be compensated resulting in sub-picosecond pulses. External cavity semiconductor mode-locked lasers can be …
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Design and fabrication of vertical external cavity surface-emitting lasers
… surface-emitting laser, known as a vertical external cavity surface-emitting laser (VECSEL). A VECSEL utilizes a free space cavity along with larger transverse cavity dimensions, to extract higher output power. To aid the design of the VECSEL, the thesis begins with fabrication and …
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A 674 nm external cavity diode laser for a ⁸⁸Sr⁺ ion trap
… processing. In this thesis, a 674 nm extended cavity diode laser is built to address an optical quantum bit in ⁸⁸Sr⁺ with the goal of testing such traps. To find this transition, a depletion experiment is performed in which the 674 nm transition depopulates the principal 422 nm transition, …
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External cavity laser with coherent amplifier array and multiple slit spatial filter
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1986.
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Frequency stability of a helium neon laser system with external cavity control
… of frequency stabilization plus the use of an external cavity to passively control the frequency of the Fabry-Perot laser cavity. Data from this system has been analyzed and the state-of-the-art results of long term and short term relative frequency stability is presented.
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An overview of laser operation and modelocking of a vertical external cavity surface emitting laser (VECSEL)
… power, diffraction limited beam quality, intra-cavity frequency doubling, tunability, and ultrashort pulses generated from passive mode-locking. In this work, we give a brief overview of the VECSEL structure, previous VECSEL literature, how lasing in a VECSEL works, and how mode locking in a …
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BEAM COMBINING OF FIBER LASERS AND VERTICAL EXTERNAL CAVITY SURFACE EMITTING LASERS USING VOLUME BRAGG GRATINGS
Advances in high brightness laser sources with near diffraction limited beam quality outputs have enabled wide range of applications. However, physical constraints such as material heating and nonlinear effects limit the maximum achievable power of these laser sources. In order to obtain higher …
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Operation of five individual laser diodes as a coherent ensemble by fiber coupling into an external cavity
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1992.
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Laser diode-to-singlemode fiber butt-coupling and extremely-short-external-cavity laser diodes: Analysis, realization and applications
… are varied over a wide range. The strong external optical feedback to the laser diode cavity that is present at extremely-short separations between the laser diode and the fiber is advantageously used to realize an extremely-short external cavity laser diode. By varying the length of the …
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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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Analysis and characterization of slab-coupled optical waveguide amplifiers and lasers
… for use in high power optical amplifiers and external cavity lasers. The thesis begins by introducing the SCOW concept and describing the benefits of utilizing a low optical confinement design for high power operation. Detailed analysis and measurements of the output power, gain, and noise …
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Pivot-Point-Independent Mode-Hop-Free Tunable Laser with a Large Tuning Range and Narrow Linewidth
This thesis introduces a novel external cavity tunable laser which is pivot-point-independent with a large mode-hop-free tuning range and fast tuning speed. The research focuses on the laser cavity design that achieves mode-hop-free tuning. <br/><br/>Among the diverse categories of tunable lasers, …
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Femtosecond pulse generation in surface-emitting semiconductor lasers
… in mode-locked optically pumped vertical external-cavity surface-emitting lasers (VECSELs). Continuous wave VECSELs were first designed as a type of semiconductor laser capable of producing high output power in near transform-limited beams. Optical pumping allows the output power of the …
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