Micro lens coupled large area photoconductive switch for powerful THz emission

Author

Matthäus, G. ; Hohmuth, R. ; Voitsch, M. ; Richter, W. ; Riehemann, S. ; Notni, G. ; Nolte, S. ; Tünnermann, A.

Author_Institution

Inst. of Appl. Phys., Friedrich-Schiller-Univ., Jena

fYear

2008

fDate

15-19 Sept. 2008

Firstpage

1

Lastpage

2

Abstract

Powerful THz emission based on a finger electrode photoconductive switch attached to a micro lens array is presented. A hexagonal packed lens array directs the incident pump light into specified electrode gaps, yielding only constructive interference in the THz far-field. Using a Ti:Sapphire system operating at 80 MHz with 150 fs pulses and 3 W maximum optical excitation, 0.28 mW THz average power is obtained. The maximum IR-to-THz conversion efficiency is ap1.3times10^-4.

Keywords

electrodes; high-speed optical techniques; light interference; microlenses; optical arrays; optical frequency conversion; photoconducting switches; terahertz wave generation; time resolved spectra; Al₂O₃:Ti; constructive interference; conversion efficiency; electrode gaps; finger electrode photoconductive switch; frequency 80 MHz; hexagonal packed lens array; large area emitter; microlens array; optical excitation; power 0.28 mW; power 3 W; terahertz emission; time 150 fs; Biomedical optical imaging; Electrodes; Fingers; Gallium arsenide; Lenses; Optical pumping; Optical sensors; Photoconductivity; Surface emitting lasers; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter and Terahertz Waves, 2008. IRMMW-THz 2008. 33rd International Conference on

Conference_Location

Pasadena, CA

Print_ISBN

978-1-4244-2119-0

Electronic_ISBN

978-1-4244-2120-6

Type

conf

DOI

10.1109/ICIMW.2008.4665625

Filename

4665625