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Simultaneous lasing of interband and intersubband transitions in quantum cascade laser structures
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10.1063/1.2838296
/content/aip/journal/apl/92/4/10.1063/1.2838296
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/4/10.1063/1.2838296
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Figures

Image of FIG. 1.
FIG. 1.

Schematic conduction band diagram of an injection and active part at zero-bias voltage. Three InAs wells out of seven wells are doped with Si to for sample A, for sample B, and for sample C. The calculated in a repeat are for sample A, for sample B, and for sample C. The spatially direct ISB transition together with longitudinal optical phonon scattering depopulation scheme is used in the active parts.

Image of FIG. 2.
FIG. 2.

(a) characteristics of samples A and C measured at . The cavity length of the two devices was . The observed was for sample A containing low-doped injection part, which is higher than for sample C containing high-doped injection part. (b) characteristics of the two samples measured at . Current pulses of with a repetition rate of were used for the measurements. The at were for sample A and for sample C.

Image of FIG. 3.
FIG. 3.

EL spectra of (a) sample A and (b) sample C measured at . Current pulses at with duty cycle of 5% were used for EL measurements. Comparing with sample A containing low-doped injection parts, the InAs IB-EL was not detected for sample C containing high-doped injection parts. The inset of Fig. 3(a) shows the polarization-resolved emission spectra of sample A .

Image of FIG. 4.
FIG. 4.

Emission spectrum of sample B measured at . Current pulses of with a repetition rate of were used for the measurements. Simultaneous lasing of the IB and ISB transitions was observed. Observed ISB and IB laser emission wavelengths were 4.8 and , respectively. The inset shows characteristics as a function of temperature. Simultaneous lasing was observed up to .

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/content/aip/journal/apl/92/4/10.1063/1.2838296
2008-01-28
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Simultaneous lasing of interband and intersubband transitions in InAs∕AlSb quantum cascade laser structures
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/4/10.1063/1.2838296
10.1063/1.2838296
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