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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 71 to 80 of 576 (0.042 seconds)| 71 |
Fundamental processes in laser-microprobe mass spectrometryMatthews, Lindsay Jane January 1991 (has links)
No description available.
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| 72 |
Development of a laser sheet dropsizing technique for spraysLe Gal, P. January 1999 (has links)
No description available.
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| 73 |
Optical frequency shifter using stimulated Brillouin scattering in fibre optic ring resonatorsKhan, Omer Shahab January 1994 (has links)
A fibre optic frequency shifter has been developed which generates a heterodyne frequency that is used to facilitate electronic demodulation of optical information. The operation of this device is analogous to an acoustooptic device such as a Bragg cell. This frequency shifter works on the principle of mixing two stimulated Brillouin scattering signals (generated in optical fibre ring resonators) which have slightly different frequencies. Dual ring resonator and single ring resonator topologies have been used. For the former system a conversion efficiency of 16% was obtained. The beat frequency was tunable between 218.4 MHz and 414.6 MHz for a 40'C change in temperature. A temperature coefficient of 5+0.2 MHzK-1 was measured. The later configuration provides a highly stable carrier frequency (11MHz) with a temperature coefficient of 6.7+0-5 kHzK-1. A 20% conversion efficiency was obtained. This demonstrates that this technique offers a practical, fibre efficient, low optical power requirement method for producing a frequency shifter. One of the main advantages of the system is that no electrical power is required to produce the travelling acoustic wave. A novel technique to characterize the frequency response of optical detectoramplifier combinations, used in this project to detect these high frequencies, is also demonstrated. The technique is based on the wavelength modulation of a laser diode source in a path length imbalanced two-beam interferometer. A robust configuration using a low finesse Fabry-Perot interferometer made from birefringent optical fibre has been implemented. Measurements for several detector circuits are presented for the frequency range DC to about 30 MHz. Results are compared with direct modulation of the laser intensity and also with a circuit simulation programme (PSpice) and found to be in close agreement.
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| 74 |
Rayleigh backscatter noise in the fibre optic gyroscopeMackintosh, James Macrae January 1988 (has links)
No description available.
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| 75 |
Raman and laser FIR emission characteristics from Dsub(2)O and some new pulsed lines from CDsub(3)OHAhmed, H. January 1983 (has links)
No description available.
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| 76 |
The two frequency cyclotron resonance maser : theory and experimentHunter, Gordon John January 2002 (has links)
No description available.
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| 77 |
Spectroscopic studies of atomic and molecular species relevant to the optical fibre transmission bandsMeldau, James January 1995 (has links)
No description available.
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| 78 |
Resonance spectroscopy and optical pumping using a waveguide COsub(2) laserDevoy, D. January 1984 (has links)
No description available.
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| 79 |
The development and application of surface discharges for pumping dye lasersFulker, David James January 2003 (has links)
No description available.
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| 80 |
Photoionisation in Cosub(2) TE lasersScott, S. J. January 1984 (has links)
No description available.
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