High passive CEP stability from a few-cycle, tunable NOPA-DFG system for observation of CEP-effects in photoemission.
The investigation of fundamental mechanisms taking place on a femtosecond time scale is enabled by ultrafast pulsed laser sources. Here, the control of pulse duration, center wavelength, and especially the carrier-envelope phase has been shown to be of essential importance for coherent control of high harmonic generation and attosecond physics and, more recently, also for electron photoemission from metallic nanostructures. In this paper we demonstrate the realization of a source of 2-cycle laser pulses tunable between 1.2 and 2.1 μm, and with intrinsic CEP stability. The latter is guaranteed by difference frequency generation between the output pulse trains of two noncollinear optical parametric amplifier stages that share the same CEP variations. The CEP stability is better than 50 mrad over 20 minutes, when averaging over 100 pulses. We demonstrate the good CEP stability by measuring kinetic energy spectra of photoemitted electrons from a single metal nanostructure and by observing a clear variation of the electron yield with the CEP.
Jan
J
Vogelsang
Jörg
J
Robin
Björn
B
Piglosiewicz
Cristian
C
Manzoni
Paolo
P
Farinello
Stefan
S
Melzer
Philippe
P
Feru
Giulio
G
Cerullo
Christoph
C
Lienau
Petra
P
Groß
D000669:Amplifiers, Electronic; D004560:Electricity; D004583:Electrons; D007368:Interferometry; D007700:Kinetics; D007834:Lasers; D055620:Optical Phenomena; D013997:Time Factors