Improving the signal-to-noise ratio of femtosecond luminescence upconversion by multichannel detection

We have improved the sensitivity and signal-to-noise ratio of a luminescence upconversion experiment, using a charge-coupled device (CCD) as the detector. We show experimentally and numerically that the bandwidth of a 1-mm-thick beta-barium berate crystal is large enough to take full advantage of the multichannel capabilities of the CCD. The improvement is significant in a standard experiment with a single laser as well as in experiments with resonant excitation that use two synchronized femtosecond pulse sources at different wavelengths. The characteristics of the two-color scheme are discussed in detail. (C) 1998 Optical Society of America.


Published in:
Journal of the Optical Society of America B-Optical Physics, 15, 4, 1410-1417
Year:
1998
ISSN:
0740-3224
Keywords:
Note:
Swiss Fed Inst Technol, Inst Micro & Optoelect, Dept Phys, CH-1015 Lausanne, Switzerland. Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England. Weizmann Inst Sci, Dept Phys, IL-76100 Rehovot, Israel. Univ Estadual Campinas, Inst Fis, BR-13081970 Campinas, SP, Brazil. Haacke, S, Swiss Fed Inst Technol, Inst Micro & Optoelect, Dept Phys, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: ZF374
Times Cited: 10
Cited Reference Count: 19
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