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Temperature performance analysis of terahertz quantum cascade lasers: Vertical versus diagonal designs
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10.1063/1.3430741
/content/aip/journal/apl/96/20/10.1063/1.3430741
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/20/10.1063/1.3430741

Figures

Image of FIG. 1.
FIG. 1.

Conduction band diagram for the 3.2 THz QCL with (a) 0% diagonality and (b) 70% diagonality. Upper and lower laser levels are marked by bold solid lines.

Image of FIG. 2.
FIG. 2.

Dependence of the peak gain on the active region lattice temperature for different operating frequencies and diagonalities. The shown results are for optimum bias, which only weakly depends on temperature and has for each structure been determined at 150 K as to yield maximum gain.

Image of FIG. 3.
FIG. 3.

and for different degrees of diagonality for the (a) 2.3 THz QCL and (b) the 4.1 THz QCL at lattice temperatures of 150 K and 200 K, respectively. The bias is chosen as to maximize the peak gain.

Image of FIG. 4.
FIG. 4.

Temperature dependence for (a) 30% diagonality and (b) 50% diagonality of the relative inversion and relative inverse linewidth . The peak gain improvement is .

Tables

Generic image for table
Table I.

Overview of the designed THz QCLs. All layer thicknesses are given in angstrom and bold numbers indicate barriers. The underlined wells are doped with a sheet density of in their 55 Å wide middle region.

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/content/aip/journal/apl/96/20/10.1063/1.3430741
2010-05-21
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Temperature performance analysis of terahertz quantum cascade lasers: Vertical versus diagonal designs
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/20/10.1063/1.3430741
10.1063/1.3430741
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