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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 20 for “"YAG-Laser"”.
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Ultrashort pulse generation with solid state Cr⁴⁺:YAG laser
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2003.
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A few-cycle Cr⁴⁺:YAG laser and optical studies of photonic crystals
A prismless Cr4+:YAG laser was used to generate 20 fs pulses at 1450 nm with a bandwidth of 190 nm FWHM. Intracavity group velocity dispersion was compensated with double-chirped mirrors. Pulse spectrum was observable from 1140 to >1700 nm. Broadband saturable Bragg reflectors were designed and …
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A Q-switched, cavity-dumped YAG laser for use in plasma physics experiments
A Q-switched, cavity-dumped Nd:YAG laser was developed for use as a diagnostic tool in plasma physics experiments. This laser uses an unstable resonator configuration to produce higher gain and better collimation than would otherwise be possible. Pulses of light with energies of 18±2 mJ and FWHMs …
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Quenching and tempering effects on Rheo-cast F357 aluminium alloy during Nd: YAG laser welding
… to T4, T4+ or T6 heat treatments prior to laser welding. Welding of aluminium alloys poses many problems like porosity, loss of alloying elements, poor bead geometry and softening of the heat affected zone. Laser welding is however widely used in industrial production owing to the …
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LASER DIODE PUMPED ND: YAG SOLID STATE LASER FOR APPLICATIONS IN SECOND HARMONIC GENERATION
In this thesis, a new pumping approach for the YAG laser pumped by laser diode is proposed to achieve high energy/power performances. In this approach, the central part of the pump beam from the laser diode is absorbed directly by the YAG rod through its convex end surface, which is very much like …
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Diagnostic and treatment tactics and Nd: YAG laser therapy in conditions of acute bleeding associated with gastric and duodenal ulcers // Диагностичнo-лечебна тактика и Nd:YAG лазер терапия в условията на остро кървене от стомашни и дуоденални язви
… и анализ на резултатите от приложението на Nd:YAG лазерната хемостаза при пациенти с кървене от СДЯ в условията на спешност. Проучени са 325 болни с остро кървене от СДЯ. При 295 е извършена Nd:YAG ЛФК. При 30 пациента - монополярна електрокоагулация. До втория час от приемането на пациентите, …
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The Synthesis and properties of functionalised polymers
… of their activities as nlo materials using a Nd/YAG laser system. The second harmonic intensity of each was measured relative to quartz. However no materials of significant activity were produced. In an attempt to produce polymers that might subsequently be functionalised the polymerisation of …
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On the Rayleigh -Brillouin scattering in air
… Its transmitter is a double-frequency Nd-YAG laser at 532nm. Most of the data used in this research were taken on 31 July 2002.</p><p>A widely used mathematic model---the S6 model---is fitted to the measured RBS spectra. The discrepancies between the measured temperature from the …
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Enhanced performance of optical sources in III-V materials using photonic crystals
… ultra-short 35 femtosecond pulses in a Cr4+:YAG laser. Chapter 4 develops the design, fabrication, and testing of a novel low-threshold microcavity laser.
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Analysis of residual stresses in laser trimmed alumina microelectronic substrates
… presented here investigates the effects of laser trimming on the state of stress in alumina Al₂O₃ hybrid microelectronics substrates. Evaluation of stress was performed using x-ray diffraction residual stress analysis and dynamic strain measurements using strain gages before and after laser …
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Mechanical properties of laser welded semi-solid metal cast A356 alloy
… SSM HPDC components. A high continuous wave Nd: YAG laser has been used to investigate the weldability of SSM cast A356 alloy. The CSIR rheo-process was used to prepare the aluminium A356 SSM slurries and thereafter plates (4X80X100 mm3) were cast using a 50 Ton Edgewick HPDC machine. Plates in …
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Laser Diagnostic Techniques with Ultra-High Repetition Rate for Studies in Combustion Environments
When conducting laser based diagnostics in combustion environments it is often desirable to obtain temporally resolved information. This can be due to several factors such as combustion taking place in a turbulent flow field, flame propagation from a spark plug in an initially quiescent combustible …
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Oblique Shock Wave Effects on Impulsively Accelerated Heavy Gas Column
… Concentration was measured using Planar Laser Induced Fluorescence (PLIF) of an acetone vapor tracer mixed with the heavy gas jet and illuminated by a pulsed Nd-YAG laser. Shocks with Mach numbers of 1.13, 1.5, 1.7, and 2.0 were used for inclinations of 0 degrees (planar normal shock …
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Diodengepumpte Laserverstärker mit flachen Lasermedien
Pulsed Laser-Oscillators are limited to a maximum output power depending on their regime of puls duration and repetition rate. The use of amplifiers enable higher power levels. The present theses reports on the development of laser amplifiers with a flat laser media and a special hybrid resonator, …
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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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Untersuchung der bakteriziden Wirkung von Nd:YAG-Laserstrahlung am Leitkeim Enterococcus faecalis in bovinem Dentin bei Pulsdauern von 15 und 25 ms : eine In-vitro-Studie
… is to determine the bactericidal depth effect of laser irradiation with a wavelength of 1064 nm at pulse durations of 15 and 25 ms. Given that the success of endodontic treatment depends on the effective elimination of microorganisms from the root canal and this cannot always be achieved by …