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Photoelectron Spectroscopic Determination of the Energy Bandwidths of High-Order Harmonics (7th-55th) Produced by an Ultrafast Laser in Neon

Published

Author(s)

L Nugent-Glandorf, M Scheer, M Krishnamurthy, J W. Odom, S R. Leone

Abstract

The energy bandwidths of high-order harmonics of a Ti:sapphire ultrafast laser are extracted from electron kinetic-energy measurements of the photoionization of gas-phase atoms and molecules. High-order harmonics of the 70 fs. 800 nm laser are produced by focusing nearly equal to} 2.5 mJ pulses into a jet of neon gas and are frequency-separated by a grazing-incidence grating. Photoelectrons resulting from the ionization of gaseous samples are energy-analyzed with a magnetic bottle time-of-flight spectrometer. Energy broadening of the photoelectron peaks at low kinetic energies are a direct result of the energy bandwidths of the harmonics. The energy bandwidths of the harmonics are found to increase from 0.11( 0.03) eV (7th harmonic) to 0.37( 0.03) eV (45th harmonic) in a gradual manner. The higher-order harmonics (47th-55th) appear to reach a plateau at a value of nearly equal to} 0.43 eV. Though a full theoretical treatment of bandwidths of the harmonics for the 70 fs driving pulse regime does not exist, the theories developed for shorter pulses (less then or equal to}30 fs) can give insight into the observed results.
Citation
Physical Review A (Atomic, Molecular and Optical Physics)
Volume
62
Issue
No. 2

Keywords

energy bandwidth, high-harmonic generation, magnetic bottle, photoelectron, Ti-Sapphire, time-of-flight

Citation

Nugent-Glandorf, L. , Scheer, M. , Krishnamurthy, M. , Odom, J. and Leone, S. (2000), Photoelectron Spectroscopic Determination of the Energy Bandwidths of High-Order Harmonics (7th-55th) Produced by an Ultrafast Laser in Neon, Physical Review A (Atomic, Molecular and Optical Physics) (Accessed April 14, 2024)
Created July 31, 2000, Updated October 12, 2021