title: Stable, tunable calibration source for large-beam optical systems.
abstract: An optical calibration source for free-space systems with large beams is presented. It produces a 2 W, 370 mm beam tunable from 1545-1570 nm with a wavefront error of <lambda/15 peak to valley and <0.013lambda rms at 1550 nm, power stability of <+/-0.02 dB, arbitrarily selected polarization, and polarization stability of <+/-1 degrees /h in orientation and <+/-0.02/h in ellipticity.
authors.affiliation: MIT Lincoln Laboratory, MA 02420, USA. ulmer@ll.mit.edu
authors.forename: Todd G
authors.initials: TG
authors.lastname: Ulmer
authors.forename: Amy C
authors.initials: AC
authors.lastname: Raudenbush
authors.forename: Vicky
authors.initials: V
authors.lastname: Loriaux