Multimode Regimes in Quantum Cascade Lasers: From Coherent Instabilities to Spatial Hole Burning
Technical rept. 14 Jun 2004-13 Jun 2007
HARVARD UNIV CAMBRIDGE MA SCHOOL OF ENGINEERING AND APPLIED SCIENCES
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A systematic experimental and theoretical study of multimode regimes has been performed in high power mid-infrared quantum cascade lasers QCLs. In narrow devices it is found that above a second threshold the laser spectrum dramatically broadens showing multimode operation with pronounced Rabi sidebands in the envelope of the spectrum. This represents the first direct evidence of the coherent instability associated with population oscillations at the Rabi frequency. For ridge widths much larger than the wavelength, the Rabi sidebands disappear.
- Lasers and Masers
- Manufacturing and Industrial Engineering and Control of Production Systems