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Optical and thermal characteristics of narrow-ridge quantum-cascade lasers
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10.1063/1.2907862
/content/aip/journal/jap/103/8/10.1063/1.2907862
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/8/10.1063/1.2907862
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Scanning-electron microscope image of a cleaved laser facet. (b) Measured two-dimensional beam profile showing a single mode. The inset shows the laser beam divergence in both the vertical and lateral directions.

Image of FIG. 2.
FIG. 2.

Total average optical power (twice the single-facet output) from a laser with as-cleaved facets driven with current pulses and repetition rate (50% dc) at . The slope efficiency of is almost constant in the current range between 400 and . The inset shows the total average power of the laser driven with current pulses as a function of duty cycle. (100% duty cycle means that the laser was driven with a constant current source.)

Image of FIG. 3.
FIG. 3.

(a) Total average emission power as a function of duty cycle for a laser with as-cleaved facets. The current pulse length is . The different curves correspond to various heat-sink temperatures controlled by using a double-stage thermoelectrical cooler. The inset shows a high-resolution, , Fourier-transform spectrum of the laser driven with long current pulses at temperature. (b) Optical emission power averaged during the pulse at drive current as a function of duty cycle at various temperatures. [Temperature assignment for different line styles is the same for parts (a) and (b)].

Image of FIG. 4.
FIG. 4.

Data points correspond to the increase in the active region temperature due to duty cycle for quasi-cw operation. The dashed line is a linear fit of these data and imply that the thermal resistance is and the thermal conductance is .

Image of FIG. 5.
FIG. 5.

Threshold current density of a laser with as-cleaved facets in pulse and cw operations. Data analysis after Ref. 28 gives a thermal resistance of corresponding to a thermal conductance per unit area of .

Image of FIG. 6.
FIG. 6.

(a) Total average emission power as a function of duty cycle for a laser with as-cleaved facets. The current pulse length is . The different symbols correspond to various heat-sink temperatures controlled by using a He-flow cryostat. (b) Peak optical power averaged over the pulse length at drive current as a function of duty cycle at cryogenic temperatures. These data imply a thermal resistance of corresponding to .

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/content/aip/journal/jap/103/8/10.1063/1.2907862
2008-04-23
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical and thermal characteristics of narrow-ridge quantum-cascade lasers
http://aip.metastore.ingenta.com/content/aip/journal/jap/103/8/10.1063/1.2907862
10.1063/1.2907862
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