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 42 for “"tunable laser"”.
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Pivot point independent, external cavity tunable laser
… 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 as they are …
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Tunable laser spectroscopy of the NaNe A² -X² ⁺ system
Thesis. 1977. Sc.D.--Massachusetts Institute of Technology. Dept. of Physics.
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Photonic crystal based widely tunable laser diodes and integrated optoelectronic components
… the development of photonic crystal based widely tunable laser diodes and their monolithic integration with photonic crystal based passive waveguide and coupler structures is explored theoretically and experimentally. In these devices, the photonic crystal is operated in the photonic bandgap which …
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Automated SG-DBR Tunable Laser Calibration Optimized for Optical Coherence Tomography Applications
<p>SG-DBR lasers look to solve many problems associated with present OCT sources by being cost effective, smaller in size, more robust, and by operating at faster repetition rates. Swept Source Optical Coherence Tomography (SS-OCT) requires a tunable laser source that exhibits linear frequency …
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Multiphoton ionization and photoelectron spectroscopy of hydrogen iodide with fixed wavelength and tunable laser sources
… for the high $\nu\sp+$ members of both series. Tunable laser experiments, at optical intensities of $\sim$10$\sp{11}$ W/cm$\sp2,$ have demonstrated (2 + 1)-REMPI ionization of the HI molecule through resonances in the intermediate $b\sp3\Pi\sb2$(v = 0,1;J = 0-12) state. However, resonances with …
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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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Theory and Modelling of Wavelength Tunable Laser Transmitters With Enhanced Tuning Range and Their Modulation Performance
… key characteristics of the operation of Tunable Laser Diodes (TLDs), such as Continuous Wave (CW) operation, discontinuous, continuous and quasicontinuous wavelength tuning and direct Intensity Modulation (IM) (small-signal analysis). Two software simulation tools were used to model the …
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Investigation of wavelength tunable laser modules for use in future optically switched dense wavelength division multiplexed networks
… thesis investigates the use of fast wavelength tunable laser modules in future optically switched dense wavelength division multiplexed networks (DWDM). The worldwide demand for increasingly greater broadband access has thus far been satisfied by the use of DWDM networks, enabled by the …
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Design, modelling and experimental characterization of complex photonic structure: from microring resonator to hybrid integrated tunable laser
L'abstract è presente nell'allegato / the abstract is in the attachment
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Investigation of nonlinear processes and device designs applicable to the creation of a compact, broadly tunable laser based on a tantalum pentoxide planar lightwave circuit platform
… in a nonlinear medium to create a widely tunable pulsed laser source. Currently most of nonlinear lasers are based on bulk optics or photonic fibres. Lasers based on bulk optics utilizing nonlinear crystals in conjunction with high intensity pulsed laser pumps, which are very powerful and …
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Design and Performance Analysis of Frequency-Shift Keyed Transmitter using Rapidly Tunable Lasers
… multi-Gb/s channel bandwidths. For free-space laser communication (lasercom) applications, links are usually point-to-point, have narrow beamwidths, and do not need to share a transmitting medium with other signals. Therefore, many lasercom applications could exploit the benefits of FSK by …
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Laser diode-to-singlemode fiber butt-coupling and extremely-short-external-cavity laser diodes: Analysis, realization and applications
The butt-coupling of a Fabry-Perot semiconductor laser diode and a singlemode optical fiber was realized and characterized in the near field. A novel butt-coupling model was developed and found very effective in describing all physical phenomena that occur when the butt-coupling parameters are …
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Operational characteristics and grating tuning of quantum well heterostructure lasers
… 1-x}$As quantum well heterostructure diode lasers showing that the large band filling range of a combined GaAs-In$\sb{\rm x}$Ga$\sb{\rm 1-x}$As quantum well makes possible a very large tuning range in external grating cavity operation. The bandfilling and gain profile are shown to be …
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Linear-cavity tunable fibre lasers employing an Opto-VLSI processor and a MEMS-based device
… experimentally two novel linear-cavity tunable fibre lasers employing an erbium-doped fibre (EDF) in conjunction with an Opto- VLSI processor and a MEMS-based device for wavelength selection. The Opto-VLSI processor and the MEMS-based device along with an optical collimator, a Bragg …
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Affidabilità di laser sintonizzabili di tipo innovativo per applicazioni in sistemi di telecomunicazione
… designed and manufactured by Pirelli, that is a tunable laser of new conception, based on photonic nanotechnologies.
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Multiphoton ionization of hydrogen iodide and molecular iodine using photoelectron spectroscopy
… anharmonicities were extracted from the data. Tunable laser experiments (567-578 nm) showed a new Rydberg series of I$\sb2$ converging to the excited state of $\rm I\sbsp{2}{+}(\sp2\Sigma\sb{3/2\rm u}).$
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Novel semiconductor based broadly tunable light sources
… led to the realisation of a new generation of laser sources. Furthermore, the advent of a new generation of quasi-phase-matched, waveguided and semiconductor nonlinear materials together with novel semiconductor lasers have led to the development of new frequency conversion and parametric …
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Embedded Sensing System for Whispering-Gallery-Mode Optical Resonators
… ranging from optical communications, microlasers, sensing, opto-mechanics to quantum optics. However, overcoming obstacles of practical applications for WGM resonators is absolutely a big challenge. First, we report the first realization of a compact WGM sensing system, which integrates a …
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Indium phosphide based integrated photonic devices for telecommunications and sensing applications
… fiber-optic telecommunications and an integrated tunable laser for trace-gas sensing are investigated in this thesis. These devices are fabricated in the indium phosphide (InP) material system, which includes InP and the ternary/quaternary III-V semiconductors that can be grown closely …
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Development and testing of real-time tunable diode laser based water vapor measurement system
The water vapor sensor based on tunable laser diode absorption spectroscopy, capable of measuring concentration of water vapor in real time at multiple locations in fire environment under extreme obscuration was designed. A three-tier detection sensitivity scheme was implemented using various …
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