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Schematic cross section of the PbTe VECSEL on a Si-substrate with a short cavity.
Calculated threshold gain spectra for a resonant (without AR-coating) and antiresonant (with AR-coating) design and resonance wavelength.
Normalized laser spectra at 100 K operation temperature in pulsed (100 ns at 10 kHz) mode at different piezovoltages for the sample without AR-coating. Only one mode is emitted for voltages between 10 and 80 V. Two modes appear at 0 and 5 V, which corresponds to a free spectral range of 135 nm for this specific setup.
Normalized monomode spectra at different temperatures and fixed piezovoltage for the sample with AR-coating. Lasing wavelengths range from at 90 K to at 170 K operating temperature.
Measured angular distribution of the output beam. A circular TEM00 mode with a divergence (half) angle is observed, corresponding to .
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