Nick Brewer: Difference between revisions

The control and repump beam are coupled into the same fiber using a polarizing beam cube and a polarization maintaining fiber. The output of the fiber is sent through a glan taylor polarizer and a 1/2 wave plate. The probe is also sent through a fiber with a glan taylor and 1/2 wave plate at the output. TheThere twois beamsabout area directedmicrowatt parallelof torepump eachand other,probe butpower. horizontally displacedI byhave ~3/4seen inches,controls andpowers sentbefore throughthe acrystal 200up mmto lens350 somW. that theyIf focusthe andRF overlapis eachon otherfor inany length of time the crystal.fiber seems Thisto geometrybecome ismisaligned used(presumably sofrom thatthe AOM heating up) so the probepower canneeds to be separatedchecked fromquickly. the control/repumpThe beams.beam can Therebe iswalked anotherthrough 200the mmfiber lensat onlow thepower, otherand sideoptimized ofby using the crystaldelay box to recollimatesend theshort (~10 microsecond) pulses through at a time that can be seen on a beamsphotodiode.