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Coupled electron-phonon modes in optically pumped resonant intersubband lasers
H C Liu1, C Y Song, Z R Wasilewski
1Institute for Microstructural Sciences, National Research Council, Ottawa, Canada K1A 0R6. h.c.liu@nrc.ca
Physical Review Letters
|March 14, 2003
Summary
Researchers achieved intersubband lasing using a CO2 laser and a novel Raman process in GaAs/AlGaAs quantum wells. This demonstrates strong coupling between electronic transitions and phonons, opening avenues for phonon laser development.
Area of Science:
- Semiconductor quantum optics
- Solid-state physics
- Laser technology
Background:
- Intersubband transitions in quantum wells are crucial for infrared optoelectronics.
- Stimulated Raman scattering offers a pathway for light generation in semiconductors.
Purpose of the Study:
- To demonstrate intersubband lasing in GaAs/AlGaAs double-quantum-well structures.
- To investigate the coupling between intersubband electronic transitions and longitudinal optical phonons.
Main Methods:
- Utilizing a carbon dioxide (CO2) laser to pump a stimulated resonant Raman process.
- Analyzing lasing action at 12-16 micrometers in three-level double-quantum-well structures.
- Observing anticrossing behavior between coupled modes.
Main Results:
- Achieved intersubband lasing in the 12-16 micrometer range.
- Provided evidence for resonant coupling between electronic intersubband transitions and longitudinal optical phonons.
- Observed clear anticrossing behavior indicating strong mode coupling.
Conclusions:
- The study highlights the significant coupling between intersubband transitions and phonons.
- Demonstrated a new possibility for developing phonon lasers.
- The findings advance the understanding of light-matter interactions in quantum well systems.