Scientist: Scott A. Crooker <email@example.com>
or (505) 665-7595
Dynamic photoluminescence measurements are made possible (~35ps resolution
in free space, ~150ps resolution through multi-mode optical fibers) using
the method of Time-Correlated Single-Photon Counting (TCSPC). Count rates
of up to 4 million counts/second are possible using an integrated time-amplitude
converter, digitizer, and multi-channel analyzer board. This enables time
resolved photoluminescence measurements in the ~100ms "flat-top"
of the 60 Tesla Long-Pulse magnet. Obviously this method also works in
any dc superconducting magnet.
resolution approaching 35ps is possible using single-mode fibers, but
with significantly reduced count rate.
sources include a femtosecond/picosecond Ti:S laser (700-1000nm, or 350-500nm
doubled; 76MHz rep rate), and a variable repetition rate 645nm pulsed
diode laser (~50ps pulsewidth; 0-80MHz). The detector is a fast microchannel-plate
PMT, with response from ~300nm to ~900nm).