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Suppression of longitudinal modes in two-sectioned, coupled-cavity terahertz quantum-cascade lasers
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10.1063/1.2794008
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Affiliations:
1 Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, 10117 Berlin, Germany
a) Electronic mail: giehler@pdi-berlin.de
Appl. Phys. Lett. 91, 161102 (2007)
/content/aip/journal/apl/91/16/10.1063/1.2794008
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/16/10.1063/1.2794008
View: Figures

## Figures

FIG. 1.

Geometry of the TSCC laser. and denote the amplitude of the partial wave propagating to the right and left, respectively, on the left (unprimed) or right side (primed) of the interface .

FIG. 2.

(a) Normalized longitudinal-mode spectrum (thick line) of sample A (, ) at for , pulse width , repetition rate , and a spectral resolution of . The vertical gray bars mark the calculated eigenfrequencies using Eq. (3). The spectrum indicated by the thin line was calculated using Eq. (4). (b) Calculated normalized modulation degree of the mode heights and (c) mode spacings. The squares and circles in (b) and (c) refer to calculated results obtained using Eqs. (3) and (4), respectively.

FIG. 3.

(a) Integrated intensity and (b) longitudinal-mode spectra of sample B (, ) for and different values of . The gray spectrum was calculated using Eq. (4). The dashed line in (a) is a guide to the eye.

FIG. 4.

(a) Integrated intensity vs delay and (b) corresponding mode spectra of sample C (, , , , pulse widths of ) from bottom to top for , 15, 30, 45, 53, 60, 75, 83, 100, 115, 145, 175, 190, 204, 224, and as partly indicated on the right-hand side of (b). The dots and circles refer to spectra without and with mode suppression, respectively. The vertical dashed lines in (a) indicate the region of a pulse overlap of more than 50%.

/content/aip/journal/apl/91/16/10.1063/1.2794008
2007-10-15
2014-04-19

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