Introduction to the NHMFL Pulsed Field Facility at LANL

Information on the physical set-up of pulsed field measurements

Read about lock-in amplifiers and their role in your measurements

Information about noise and ways to eliminate it from your measurements

How to collect and evaluate your measurement data

Information on optical spectroscopy

Information about time-resolved optics

Information on de Haas van Alphen Effect measurements

Information on Shubinkov de Haas Effect measurements

Information on Absolute Resistivity measurements

Information on Heat Capacity measurements

Information on RF Penetration Depth measurements

Time Resolved Optics

Associated Scientist: Scott A. Crooker <crooker@lanl.gov> 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.

Time resolution approaching 35ps is possible using single-mode fibers, but with significantly reduced count rate.

Light 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).