Saturation of light-current characteristics of high-power laser diodes ({lambda} = 1.0-1.8 {mu}m) under pulse operation
- Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)
- Voronezh State University (Russian Federation)
Spectral and light-current characteristics of separate-confinement lasers that are based on InAl-GaAs/InP and InGaAsP/InP alloys and emit in the wavelength range of 1.5-1.8 {mu}m are studied at high excitation levels (up to 80 kA/cm{sup 2}) in pulse operation (100 ns, 10 kHz). It is shown that the peak intensity in the stimulated-emission spectrum saturates as the pump current is increased. Further increase in the emitted power is attained owing to the emission-spectrum broadening to shorter wavelengths, similar to lasers on the GaAs substrates ({lambda} = 1.04 {mu}m). It is established experimentally that the broadening of the stimulated-emission spectrum to shorter wavelengths is caused by an increase in the threshold current and by an increase in the charge-carrier concentration in the active region. This concentration increases by a factor of 6-7 beyond the lasing threshold and can be as high as 10{sup 19} cm{sup -3} in pulse operation. It is shown that saturation of the light-current characteristics in pulse operation takes place in the InAlGaAs/InP and InGaAsP/InP lasers as the pump current is increased. It is shown experimentally that there is a correlation between saturation of the light-current characteristic and an increase in the threshold current in the active region. An increase in the charge-carrier concentration and gradual filling of the active region and waveguide layers with electrons are observed as the pump current is increased; stimulated emission from the waveguide is observed at high pump currents.
- OSTI ID:
- 21088010
- Journal Information:
- Semiconductors, Vol. 41, Issue 8; Other Information: DOI: 10.1134/S1063782607080234; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
- Country of Publication:
- United States
- Language:
- English
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