TITLE

Terahertz time-domain-spectroscopy system based on femtosecond Yb:fiber laser and GaBiAs photoconducting components

AUTHOR(S)
Pacˇebutas, V.; Bicˇiūnas, A.; Balakauskas, S.; Krotkus, A.; Andriukaitis, G.; Lorenc, D.; Pugzˇlys, A.; Baltusˇka, A.
PUB. DATE
July 2010
SOURCE
Applied Physics Letters;7/19/2010, Vol. 97 Issue 3, p031111
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We describe a terahertz time-domain-spectroscopy system that is based on photoconductive components fabricated from low-temperature-grown GaBiAs epitaxial layers and activated by femtosecond 1.03 μm pulses emitted by an Yb:fiber laser. Experiments performed with the laser pulses of different durations have evidenced that the spectral range of the system is limited by the photoexcited carrier lifetime. The optical to terahertz conversion efficiency of the system exceeds 10-4 with the usable spectral range of about 3 THz in the case of 170 fs excitation pulses.
ACCESSION #
52479426

 

Related Articles

  • Effects of carrier confinement in graded AlGaAs/GaAs heterojunctions. Yuan, Y. R.; Mohammed, K.; Pudensi, M. A. A.; Merz, James L. // Applied Physics Letters;1984, Vol. 45 Issue 7, p739 

    An unusual new line has been observed in the 1.4-K photoluminescence spectrum of GaAs/AlGaAs epilayers grown by liquid phase epitaxy. A very strong, broad, and asymmetric line is seen, with peak energy ranging from the bound exciton to the shallowest acceptor, increasing roughly linearly with...

  • Quantum beats of free and bound excitons in GaN. Kyhm, K.; Taylor, R. A.; Ryan, J. F.; Aoki, T.; Kuwata-Gonokami, M.; Beaumont, B.; Gibart, P. // Applied Physics Letters;8/20/2001, Vol. 79 Issue 8, p1097 

    We present spectrally resolved and time-integrated four-wave mixing measurements at coherent dynamics of bound excitons in a high-quality GaN epilayer. Coherent excitation, with co-circular polarized light, of the neutral donor-bound excitons (D [sup 0]X) and A excitons (X[sub A]) results in...

  • Photoconductive antennas generate tunable narrowband terahertz pulses. Stehr, Dominik // Laser Focus World;Oct2011, Vol. 47 Issue 10, p9 

    The article reports that the researchers at the Helmholtz-Zentrum Dresden Rossendorf in Dresden, Germany created tunable narrowband terahertz pulses through difference frequency generation using a photoconductive antenna (PCA) design.

  • A method to measure weak short-lived photoconductivity induced by laser excitation in low-resistance samples. de Sande, J. C. G.; Balmaseda, M. Sánchez; Pérez, J. M. Guerra // Review of Scientific Instruments;Jun94, Vol. 65 Issue 6, p2062 

    The present article describes a simple four point-probe method to measure weak and short-lived photoconductivity in low-resistance samples. The method is based on biasing the sample with a short and intense pulse of current which permits a high sensitivity of measurement. This pulsed and...

  • Ultrashort pulse characterization using a scanning Fabry–Pe´rot e´talon enabling rapid acquisition and retrieval of a sonogram at rates up to 1.52 Hz. Cormack, I. G.; Sibbett, W.; Ortega-Martinez, R.; Reid, D. T. // Review of Scientific Instruments;Nov2001, Vol. 72 Issue 11, p4071 

    Rapid characterization of ultrashort pulses has been demonstrated by measuring a two-photon absorption sonogram trace. The use of a scanning Fabry–Pe´rot frequency filter has made it possible to acquire and retrieve a sonogram at rates as high as 1.52 Hz. We discuss details of the...

  • Lasing in optically pumped Ga(NAsP)/GaP heterostructures. Borck, S.; Chatterjee, S.; Kunert, B.; Volz, K.; Stolz, W.; Heber, J.; Rühle, W. W.; Gerhardt, N. C.; Hofmann, M. R. // Applied Physics Letters;7/17/2006, Vol. 89 Issue 3, p031102 

    We experimentally investigate the characteristics of light emission of optically excited Ga(NAsP) multiple quantum-well structures grown pseudomorphically on a GaP substrate by metal-organic vapor-phase epitaxy. The emission power as a function of excitation power shows at temperatures from 15...

  • Thin-sample limit for time-resolved terahertz spectroscopy. Schins, Juleon M. // Applied Physics Letters;10/25/2010, Vol. 97 Issue 17, p172110 

    The retrieval of the primary (subpicosecond) photoproducts in small-band two-dimensional time-domain terahertz spectroscopy has succeeded only in a few model systems, due to the complicated correlation between the two time parameters. We show that the nature of the primary photoproducts is...

  • Near-infrared femtosecond laser-induced crystallization of amorphous silicon. Jia-Min Shieh; Zun-Hao Chen; Bau-Tong Dai; Yi-Chao Wang; Alexei Zaitsev; Ci-Ling Pan // Applied Physics Letters;8/16/2004, Vol. 85 Issue 7, p1232 

    Amorphous silicon (a-Si) was crystallized by femtosecond laser annealing (FLA) using a near-infrared (λ≈800 nm) ultrafast Ti:sapphire laser system. The intense ultrashort laser pulses lead to efficient nonlinear photoenergy absorption and the generation of very dense photoexcited plasma...

  • Parametric excitation of plasma waves by counter-propagating laser beams detuned by 2ω[sub p]. Shvets, Gennady // AIP Conference Proceedings;2001, Vol. 569 Issue 1, p195 

    Short and long wavelength plasma waves can become strongly coupled in the presence of two counter-propagating laser pulses detuned by twice the cold plasma frequency ω[sub p]. This coupling leads to the exponential amplification of the plasma waves at a rate proportional to the product of...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics