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Now showing items 21-30 of 72
Subpicosecond, freely propagating electromagnetic pulse generation and detection using GaAs:As epilayers
(AIP Publishing, 1991-04-08)
Using GaAs epilayers with arsenic precipitates (GaAs:As) as the photoconductive material in a broad-band optoelectronic terahertz beam system, we have generated and detected freely propagating, subpicosecond electromagnetic ...
Terahertz conductivity of thin metal films
(AIP Publishing, 2008-08-05)
The conductivities of thin Al, Au, and Ag films were measured via their transmission at terahertz frequencies. The conductivities of all the films, particularly the thinner films and Al films, were much smaller than their ...
Doppler-tuned hyperfine spectroscopy of the lithium ion
(American Physical Society, 1978-11-20)
We have used the Doppler-tuned ion-beam, laser-spectroscopy method to measure the hyperfine intervals in the 2^3 S and 2^3 P^o states of Li+. Our resolution was 10 times that of the best previous measurement. In contrast ...
Light-controlled light modulator
(AIP Publishing, 1977-10-01)
A fast resonantly enhanced light-controlled light modulator is demonstrated. Optical switching action is obtained with driving laser pulses with intensities as low as 2 kW/cm^2. The switching mechanism is the optical ...
Measurement of the velocity distribution of sputtered Na atoms from NaCl by Doppler shift laser fluorescence
(AIP Publishing, 1981-11-01)
The velocity distribution of sputtered Na atoms from NaCI during 15 keV, Ar+ bombardment was measured by a Doppler shift laser fluorescence technique. Contrary to other measurements, the sputtered Na atoms were found to ...
Terahertz studies of carrier dynamics and dielectric response of n-type, freestanding epitaxial GaN
(AIP Publishing, 2003-04-28)
We report the characterization of the complex conductivity and dielectric function of GaN by terahertz time-domain spectroscopy. Transmission measurements are performed on an n-type, 180-um-thick, freestanding GaN crystal. ...
Theory of the dispersive modulator
(AIP Publishing, 1975-02-15)
The recent observations by Loy of amplitude modulation and compression of infrared laser pulses caused by passage through the dispersive modulator (a cell containing dilute NH3 vapor with a Stark-modulated resonant frequency) ...
Self-defocusing of light by adiabatic following in rubidium vapor
(American Physical Society, 1972-10)
The narrow-line output of a dye laser on the low-frequency side of the 2P1/2 resonance line (7948 A) of rubidium was self-defocused by passage through dilute rubidium vapor. The defocusing was caused by the electronic ...
Carrier dynamics of electrons and holes in moderately doped silicon
(American Physical Society, 1990-06-15)
A time-domain spectroscopic technique, based on the generation and detection of a collimated beam of subpicosecond broadband terahertz pulses, is used to measure the absorption and dispersion of n- and p-type silicon, with ...
THz Zenneck surface wave (THz surface plasmon) propagation on a metal sheet
(AIP Publishing, 2006-02-08)
We present an experimental study of the propagation of the THz Zenneck surface wave on an aluminum sheet, now more commonly denoted as the THz surface plasmon (TSP). Here, the TSP pulse is generated by coupling the THz ...