Abstract: Some embodiments of the disclosure are directed to a dolly for unrolling the payload wrapped on a reel from a helicopter. In some embodiments, the dolly includes one or more of a main frame, a fairlead frame, and a reel shaft. In some embodiments, the main frame is configured to hold the reel shaft. In some embodiments, the main frame is configured to hold the cable reel. In some embodiments, the fairlead frame is pivotably attached to the main frame. In some embodiments, the fairlead frame is configured to guide a cable away from the cable reel. In some embodiments, the dolly further comprises a tether configured to limit a pivot range between the main frame and the fairlead frame. In some embodiments, the dolly further comprises a brake belt. In some embodiments, the brake belt is configured to limit a rotation of the cable reel about the reel shaft.

Abstract: Two-color (two-photon) excitation with two confocal excitation beams is demonstrated with a Raman shifter as excitation light source. Two-color excitation fluorescence is obtained from Coumarin 6H dye sample (peak absorption=394 nm, peak fluorescence=490 nm) that is excited using the first two Stokes outputs (683 nm, 954 nm, two-color excitation=398 nm) of a Raman shifter pumped by a 6.5 nsec pulsed 532 nm-Nd:YAG laser (Repetition rate=10 Hz). The two Stokes pulses overlap for a few nanoseconds and two-color fluorescence is generateven with focusing objectives of low numerical apertures (NA?0.4). We observed the linear dependence of the two-color fluorescence signal with the product of the average intensities of the two Stokes excitation beams. The two-color fluorescence distribution is strongly localized around the common focus of the confocal excitation beams.