Showing papers by "Yasuharu Suematsu published in 1968"
TL;DR: In this article, a carrier lifetime measurement under lasing conditions using microwave techniques is reported, based on the direct modulation characteristic of a junction laser, and a resonance-like phenomenon of the modulated output is calculated at a fixed frequency determined by the parameters of the junction diode.
Abstract: A carrier lifetime measurement under lasing conditions using microwave techniques is reported. The direct modulation characteristic of a junction laser is analyzed, based on the rate equations, and a resonance-like phenomenon of the modulated output is calculated at a fixed frequency determined by the parameters of the junction diode. This frequency occurs just before the modulation cutoff frequency of the diode. The minority carrier lifetime in the active region of the junction laser is expressed in terms of this frequency and other parameters. A modulation experiment was performed using a microwave frequency modulated bias pulse current. The resonance-like phenomenon was confirmed experimentally and the carrier lifetime was determined from the analysis presented here.
51 citations
01 Aug 1968
TL;DR: In this paper, the response time delay on a photocathode at different surface points was measured by phase measurements of the detected beat frequencies, and a figure of equidelay lines was shown for one sample.
Abstract: The response time delay on a photocathode at different surface points was measured by phase measurements of the detected beat frequencies. A figure of equidelay lines is shown for one sample.
5 citations
01 Oct 1968
TL;DR: In this paper, the authors derived three modes of operation of bulk-semiconductor devices from a small-signal theory: admittance-type negative conductance, impedance type negative resistance, and nearly frequency-independent negative conductances.
Abstract: Three modes of operation of bulk-semiconductor devices are derived from a small-signal theory: 1) admittance-type negative conductance, 2) impedance-type negative resistance, and 3) nearly frequency-independent negative conductance. Their behavior is in approximate agreement with that of the modes of stable amplification, Gunn oscillation, and LSA oscillation, respectively, in Copeland's characterization.