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 49 for “"diode-lasers"”.
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Femtosecond nonlinearities in InGaAsP diode lasers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Wide stripe single and dual wavelength mode semiconductor diode lasers
Wide stripe semiconductor lasers have a wide variety of applications in remote sensing, in materials processing applications such as drilling and welding, and as pumps for gas lasers. The emission spectra of simple cost-effective Fabry-Perot (F-P) lasers tends to be very broad, i.e. in the 5-10 nm …
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A sensor for combustion thermometry based on blue diode lasers.
… of flame temperature have been demonstrated with diode lasers for the first time. The technique is based on the use of blue diode lasers to perform laser-induced fluorescence on indium atoms seeded to the flame. Temperature measurements have been carried out in laminar flames both by the two-line …
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Growth and characterization of mid-infrared phosphide-based semiconductor diode lasers
A diode laser emitting at mid-infrared wavelength (2~5 pm) is an ideal light source for petrochemical or industrial-important gas sensing. Antimony-based III-V compound semiconductor material is the most prominent pseudomorphic epitaxy candidate for this application. However, phosphide-based …
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High-power GaAs-based diode lasers with novel lateral designs for enhanced brightness, threshold and efficiency
… laser device market, semiconductor diode lasers continue to be in high demand as one of the most widely-used device types, generating a large share of the total revenue. GaAs-based broad-area diode lasers (BALs) operating in the 9xx nm wavelength range offer the highest optical power …
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Tailoring the emission of stripe-array diode lasers with external cavities to enable nonlinear frequency conversion
… radiation in the visible spectral range. Since diode lasers are very compact and efficient light sources, there exists a great interest to cover these applications with diode laser emission. Despite modern band gap engineering not all wavelengths can be accessed with diode laser radiation. …
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Integration von Diodenlasern in modulare Hochleistungs-Nd:YAG-Laser
Diode pumped solid state laser are well known, due to their high average power compared to lamp pumped systems. Still, they show disadvantages by means of thermo mechanics and design complexity. Where lamp pumped rod systems got two pump lamps per high power head, the same rod has to be pumped …
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Directly diode-laser-pumped titanium-doped sapphire lasers
… radiation. However, today's Ti:sapphire lasers are complex, bulky and expensive, leaving many applications unaddressed, particularly where lower costs and smaller footprints are vital. The biggest hurdle to smaller and cheaper Ti:sapphire lasers is the pump light source - typically a …
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Thermal and mechanical optimisation of diode laser bar packaging
Increasing the reliability of high power diode laser bars as a viable photon source in pumping and direct applications is necessary as increased reliability reduces costs and makes diode lasers more attractive for use. High stress levels and high thermal loads are the limiting factors for the …
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Environmental Monitoring - using diode-laser-based spectroscopic techniques
… pollutant emissions related to human activity. Diode-laser-based spectroscopic techniques, being robust and affordable, have a great potential to become an industrially well-established technology for environmental sensing. This thesis deals with the further development of these techniques, …
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High-speed characterizations of single quantum-well transistor laser
… and functionalities that cannot be achieved by diode lasers alone. In this thesis, the history of development and device structure, as well as the carrier dynamics in the TL will be first presented to provide background discussion. The focus of this thesis will be on the methods of high-speed …
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Surface trap for ytterbium ions
… provided by commercially-available ultra-violet diode lasers locked to an atomic reference using the Dichroic Atomic Vapor Laser Lock technique. We used photoionization from the Yb magneto-optical trap located within the region of the ion trapping potential.
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Thermal Management, Beam Control,and Packaging Designs For High Power
… controlling, managing and utilizing high power diode lasers are described. Low pressure water spray cooling for a high heat flux system is developed and proven to be an ideal cooling method for high power diode laser arrays. In order to enable better thermal and optical performance of diode …
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Semiconductor laser mode engineering via waveguide index structuring
Semiconductor laser diodes are used in many applications, and their performance is often strongly influenced by the optical mode properties. In this work, dielectric waveguides and their guided modes have been simulated and analyzed as relevant to semiconductor diode lasers. The transverse …
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Characteristics, Theory and Modeling of the Transistor Laser
… in the operation of semiconductor (two-terminal) diode lasers. The characteristics of the transistor laser are studied by considering the charge transport, and the coupling of the photon and quantum-mechanical electron-hole recombination dynamics in the operation of the transistor laser. An …
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Ultrashort pulse generation from diode laser devices
… of generation of ultrashort optical pulses from diode lasers. Simple and cost-effective techniques were used to generate high power, high quality optical short pulses at various wavelength windows. The major achievements presented in the thesis is summarised as follows. High power pulses …
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Spectroscopy of ultracold metastable hydrogen : in pursuit of a precision measurement
… the design and construction of two stabilized diode laser systems for performing spectroscopy of the 2S-3P and 2S-8S transitions. Spectroscopy of the one photon 2S-3P transition in hydrogen is demonstrated both by the depletion of the metastable 2S atom state and the absorption of the 2S-3P …
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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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