Enhancement of terahertz emission from InSb using a lens coupler and magnetic field

Author

Nakajima, Hidekazu ; Que, Christopher T. ; Estacio, Elmer ; Yamamoto, Kohji ; Tani, Masahiko

Author_Institution

Res. Center for Dev. of Far-Infrared Region, Univ. of Fukui, Fukui, Japan

fYear

2011

fDate

Aug. 28 2011-Sept. 1 2011

Firstpage

1274

Lastpage

1275

Abstract

Development of efficient terahertz (THz) emitters usable with a 1.55-μm fs-laser is a key issue for constructing a fiber-laser-based terahertz timed-domain spectrometer, which is more compact and cost-effective than those based on other solid-state lasers, such as a mode-locked Ti: sapphire laser. We found bulk InSb is a good candidate for such a THz emitter when its emission efficiency is enhanced by using a lens coupler and a moderate magnetic field at the same time. The enhancement of around 74 times in THz emission amplitude was achieved with an MgO hemispherical lens and a magnetic field ~ 650 mT. The signal level was comparable with that of a typical photoconductive antenna and a dynamic range of more than 10⁶ was confirmed in the observed power spectrum.

Keywords

fibre lasers; high-speed optical techniques; lenses; optical harmonic generation; optical materials; InSb; MgO; fiber laser-based terahertz timed-domain spectrometer; hemispherical lens; lens coupler; magnetic field; terahertz emission; terahertz emitters usable; Fiber lasers; Laser excitation; Lenses; Magnetic fields; Surface emitting lasers; Time domain analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics Conference & Lasers and Electro-Optics (CLEO/IQEC/PACIFIC RIM), 2011

Conference_Location

Sydney, NSW

Print_ISBN

978-1-4577-1939-4

Type

conf

DOI

10.1109/IQEC-CLEO.2011.6193890

Filename

6193890