A quantum-cascade structure based on a bound-to-continuum design exhibiting a broad gain curve is presented. The full width at half maximum of the measured luminescence spectrum is at room temperature. Grating-coupled external cavity lasers using this active region could be tuned over (1.45 μm), which is equal to 15% of the free running wavelength in pulsed mode at room temperature. Time resolved spectra showed a single-mode operation with a 30 dB side mode suppression ratio after the first 12 ns of the pulse.
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© 2004 American Institute of Physics.
2004
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