title: Chipscale, single-shot gated ultrafast optical recorder.
abstract: We introduce a novel, chipscale device capable of single-shot ultrafast recording with picosecond-scale resolution over hundreds of picoseconds of record length. The device consists of two vertically-stacked III-V planar waveguides forming a Mach-Zehnder interferometer, and makes use of a transient, optically-induced phase difference to sample a temporal waveform injected into the waveguides. The pump beam is incident on the chip from above in the form of a diagonally-oriented stripe focused by a cylindrical lens. Due to time-of-flight, this diagonal orientation enables the sampling window to be shifted linearly in time as a function of position across the lateral axis of the waveguides. This time-to-space mapping allows an ordinary camera to record the ultrafast waveform with high fidelity. We investigate the theoretical limits of this technique, present a simulation of device operation, and report a proof-of-concept experiment in GaAs, demonstrating picosecond-scale resolution over 140 ps of record length.
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, California 94550, USA. shihtm@mit.edu
authors.forename: Ta-Ming
authors.initials: TM
authors.lastname: Shih
authors.forename: Chris H
authors.initials: CH
authors.lastname: Sarantos
authors.forename: Susan M
authors.initials: SM
authors.lastname: Haynes
authors.forename: John E
authors.initials: JE
authors.lastname: Heebner
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D016247:Information Storage and Retrieval; D007368:Interferometry / Q000295:instrumentation*; D007909:Lenses; D008904:Miniaturization; D055096:Optical Devices