Large-area microlens emitters for powerful THz emission

Autor:	Andreas Tünnermann, S. Riehemann, B. Pradarutti, Gabor Matthäus, Rico Hohmuth, Gunther Notni, Wolfgang Richter, M. Voitsch, Stefan Nolte
Rok vydání:	2009
Předmět:	Photocurrent Microlens Materials science Physics and Astronomy (miscellaneous) business.industry Terahertz radiation Energy conversion efficiency General Engineering General Physics and Astronomy Nonlinear optics Optics Electrode Sapphire Optoelectronics business Common emitter
Zdroj:	Applied Physics B. 96:233-235
ISSN:	1432-0649 0946-2171
Popis:	A microlens coupled large-area emitter based on low-temperature grown GaAs is presented. A hexagonal microlens array directs the incident pump light into every second gap of a finger electrode structure. Consequently, an unidirectional photocurrent at high acceleration field strengths (50 kV/cm) is achieved, which generates constructively superposed THz emission. Using a Ti:Sapphire oscillator with a maximum average power of about 3 W at a repetition rate of 80 MHz, a net IR-to-THz conversion efficiency up to 1.3×10−4 and a THz average power of 280 μW is achieved.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4f812b97bec7bae7dfa8a8cb9ebf35c1 https://doi.org/10.1007/s00340-009-3609-6 Zobrazit plný text záznamu Plný text ve formátu PDF