Laser pulse frequency shifting by ionization and recombination fronts in semiconductor plasma

Autor:	Yoav Avitzour, I. Geltner, Szymon Suckewer
Rok vydání:	2005
Předmět:	Physics Spectrometer business.industry Physics::Optics Condensed Matter Physics Laser Two-photon absorption Atomic and Molecular Physics and Optics law.invention Optical pumping Crystal Optics law Ionization Atomic physics business Absorption (electromagnetic radiation) Refractive index
Zdroj:	Journal of Physics B: Atomic, Molecular and Optical Physics. 38:779-787
ISSN:	1361-6455 0953-4075
DOI:	10.1088/0953-4075/38/7/001
Popis:	We present a highly temporally and spatially resolved direct measurement of the propagation of ionization and recombination fronts in bulk ZnSe. The fronts were created by two-photon absorption (TPA) of 10 ps, 800 nm 'pump' pulses incident on both sides of a 1 mm thick crystal. The measurement was achieved by the spectral analysis of the frequency shift of a 100 fs 'probe' pulse transversely propagating through the crystal at the time of excitation and recombination. The probe was frequency shifted due to the temporal change in the refractive index of the medium. The delay between the probe and the pumps was finely scanned for time-resolved measurements, while imaging of the probe onto a spectrometer slit provided spatial resolution across the crystal. The spatially and temporally resolved shift agrees well with a model that includes TPA and recombination. Our set-up provides a general technique for measurements of rapid ionization and recombination processes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::56917e4f7f68102f6d6e67e506de1b76 https://doi.org/10.1088/0953-4075/38/7/001 Zobrazit plný text záznamu