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High-performance uncooled distributed-feedback quantum cascade laser without lateral regrowth
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10.1063/1.3693425
/content/aip/journal/apl/100/11/10.1063/1.3693425
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/11/10.1063/1.3693425
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Scanning electron microscope image of the grating on top of the active region after MOVPE re-growth.

Image of FIG. 2.
FIG. 2.

(Color online) Light-current-voltage of HR coated 14-μm-wide lasers with 1.5-, 2-, 2.5-, and 3-mm-long cavities at 20 °C in cw mode.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Cw lasing spectra at a different currents from 0.24 to 0.54 A with a step of 0.05 A and (b) Lasing frequency change as a function of input electrical power for the temperature range of 10-30 °C. The dotted lines is the fitting result using the function ν = ν0 + βνTsubmount + βνRthPelec.

Image of FIG. 4.
FIG. 4.

(Color online) Output power of the uncooled DFB QCLs with 1.5-, 2-, 2.5-, and 3-mm-long cavities at 20 °C in cw mode. The inset shows the heat sink temperature as a function of injection current density for different cavity length devices after lasing in uncooled cw mode.

Image of FIG. 5.
FIG. 5.

(Color online) Maximum average optical power as a function of the duty cycle at 20 °C for uncooled operation of DFB QCLs with 1.5-, 2-, 2.5-, and 3-mm-long cavities.

Image of FIG. 6.
FIG. 6.

(Color online) The maximum wall-plug efficiency as a function of cavity length for thermoelectrically cooled and uncooled device in cw mode.

Image of FIG. 7.
FIG. 7.

(Color online) Quasi-cw far-field patterns parallel to the epitaxial layers of HR coated 14 μm-wide and 3-mm-long lasers without cooling. The upper panel shows the far-field measured at different injection currents from 0.35 to 0.5 A with a step of 0.05 A at a fixed duty cycle of 1% with a pulsed width of 2 μs and the repetition frequency of 5 kHz. The lower panel shows the far-field measured with different duty cycles at a fixed current of 0.4 A. The duty cycle is 1%, 10%, 30%, and 50%, respectively.

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/content/aip/journal/apl/100/11/10.1063/1.3693425
2012-03-13
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-performance uncooled distributed-feedback quantum cascade laser without lateral regrowth
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/11/10.1063/1.3693425
10.1063/1.3693425
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