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264 results on '"Tropper, A. C."'

102. Thermally bonded planar waveguide lasers

Author

Brown, C. T. A., primary, Bonner, C. L., additional, Warburton, T. J., additional, Shepherd, D. P., additional, Tropper, A. C., additional, Hanna, D. C., additional, and Meissner, H. E., additional

Published
1997
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114. Low threshold 1.64 μm operation of a Yb,Er:YAG waveguide laser

Author

Large, A. C., primary, Hanna, D. C., additional, Shepherd, D. P., additional, Tropper, A. C., additional, Warburton, T. J., additional, Borrel, C., additional, Ferrand, B., additional, Rameix, A., additional, Thony, P., additional, Auzel, F., additional, and Meichenin, D., additional

Published
1994
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124. Diode Pumped, Garnet Channel Waveguide Lasers

Author

Large, A. C., primary, Field, S. J., additional, Hanna, D. C., additional, Shepherd, D. P., additional, Tropper, A. C., additional, Chandler, P. J., additional, Townsend, P. D., additional, and Zhang, L., additional

Published
1992
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125. Ion-implanted Nd:GGG channel waveguide laser

Author

Field, S. J., primary, Chandler, P. J., additional, Townsend, P. D., additional, Hanna, D. C., additional, Large, A. C., additional, Zhang, L., additional, Shepherd, D. P., additional, and Tropper, A. C., additional

Published
1992
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136. Fluoride fiber lasers

Author

Smart, Richard G., primary, Carter, John N., additional, Tropper, Anne C., additional, and Hanna, David C., additional

Published
1991
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139. Ion-Implanted Crystal Waveguide Lasers

Author

Field, S. J., primary, Hanna, D. C., additional, Large, A. C., additional, Shepherd, D. P., additional, Tropper, A. C., additional, Chandler, P. J., additional, Townsend, P. D., additional, and Zhang, L., additional

Published
1991
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140. OPTICAL PROPERTIES OF Tm DOPED LiNbO3AND LiNbO3(MgO)

Author

TOCHO, J. O., NÚÑEZ, L., SANZ-GARCÍA, J. A., CUSSÓ, F., HANNA, D. C., TROPPER, A. C., FIELD, S. J., SHEPHERD, D. P., LARGE, A. C., TOCHO, J. O., NÚÑEZ, L., SANZ-GARCÍA, J. A., CUSSÓ, F., HANNA, D. C., TROPPER, A. C., FIELD, S. J., SHEPHERD, D. P., and LARGE, A. C.

Abstract

The optical properties of Tm doped LiNbO3and LiNbO3: MgO, especially within the 3H6࢐3H4transition, have been studied. Differences in the absorption spectrum and particularly in the emission spectrum of Tm in both crystals are observed. New bands with different polarization character appear in the MgO doped crystals, indicating the existence of Mg-perturbed Tm sites.

Published
1991
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146. Wetting-layer-pumped continuous wave surface emitting quantum dot laser

Author

Kbashi, Hani J., Quarterman, Adrian H., Morris, Oliver J., Henini, Mohamed, Tropper, Anne C., and Wilcox, Keith G.

Abstract

We report a continuous wave 1 m laser based on InAs Stranski-Krastanov quantum dots (SK-QD) which is optically pumped on a wetting layer absorption band at 915 nm. The slope efficiency of this laser relative to absorbed pump power was measured to be 56% with wetting layer pumping, 1.75 times larger than when pumped with 830 nm light absorbed into the barriers between the SK-QD layers. Compared to barrier pumping, wetting layer pumping benefits from a smaller quantum defect, with less heat deposited in the active region, at the expense of weaker pump absorption in the thin (~1 nm) wetting layer. When a 50 m thick intracavity diamond heatspreader was contacted to the optically pumped gain structure, a 10-fold increase in output power, up to 2.25W, was obtained in the barrier pumped case. A much smaller 2-fold increase in power, to a maximum of 0.35 W, was seen for the wetting layer pumped case. The diamond heatspreader is more effective in removing heat from the active region, where it is deposited by barrier pumping, than from the substrate, which absorbs residual pump radiation in the barrier pumping case. A gain sample with a doubly periodic DBR to back reflect pump radiation, will allow the full potential of wetting layer pumping to be realised, both by increasing pump absorption due to the double pass through the active region, and by localising heat generation in the active region.

Published
2012
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149. High-inversion densities in Nd:YAG: Upconversion and bleaching.

Author

Guy, S., Bonner, C.L., Shepherd, D. P., Hanna, D. C., Tropper, A. C., and Ferrand, B.

Subjects
ND-YAG lasers
Abstract

Investigates upconversion in Nd:YAG lasers, and its implications for intensely pumped devices. Effects of the advent of high-power diode-bares combined with beam-shaping techniques as well as developments in rate-earth-doped planar waveguides; Details on the rate equations used to model Auger process in Nd[3+] ion; Details on the study.

Published
1998
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150. Active stabilisation and timing jitter characterisation of sub-500 fs pulse passively modelocked VECSEL.

Author

Quarterman, A. H., Wilcox, K. G., Elsmere, S. P., Mihoubi, Z., and Tropper, A. C.

Subjects
CRYSTAL oscillators, SIGNAL generators, FREQUENCY changers, DIGITAL communications, DATA transmission systems
Abstract

An optical Stark modelocked vertical-external-cavity surface-emitting laser producing sub-500 fs pulses at a fundamental repetition rate of 1 GHz was actively stabilised by locking its output to a 10 MHz electrical oscillator using a programmable phase-locked-loop frequency synthesiser. The timing jitter was characterised by the von der Linde method and was found to be 190(12) fs in the bandwidth 300 Hz to 1.5 MHz. [ABSTRACT FROM AUTHOR]

Published
2008
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