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Single-mode laser by parity-time symmetry breaking.
Liang Feng1, Zi Jing Wong1, Ren-Min Ma1
1NSF Nanoscale Science and Engineering Center, University of California, Berkeley, CA 94720, USA.
Science (New York, N.Y.)
|November 22, 2014
Summary
This study introduces a novel parity-time symmetry-breaking laser. This laser achieves stable, intrinsic single-mode operation, offering precise control over resonant modes for advanced laser applications.
Area of Science:
- Laser Physics
- Quantum Optics
- Optoelectronics
Background:
- Cavity resonant mode manipulation is vital for controlling laser emission.
- Conventional ring cavity lasers often suffer from multiple competing modes.
Purpose of the Study:
- To demonstrate a parity-time symmetry-breaking laser with controllable resonant modes.
- To achieve intrinsic single-mode lasing independent of gain spectral bandwidth.
Main Methods:
- Exploiting parity-time symmetry, which balances gain and loss.
- Utilizing a microring cavity with a rotationally symmetric structure.
Main Results:
- Demonstrated a laser with controllable resonant modes.
- Achieved intrinsic single-mode lasing, overcoming multi-mode competition.
- Observed thresholdless parity-time symmetry breaking for stable operation.
Conclusions:
- Parity-time symmetry offers a new paradigm for laser design.
- This approach enables stable single-mode operation with selective mode order.
- Potential applications in optical communications and computing devices.
