Related Experiment Video
Updated: Jun 22, 2026
14:18
Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Modal properties and modal control in vertically emitting annular Bragg lasers.
Optics Express
|June 25, 2009
Summary
Annular Bragg resonance (ABR) lasers can achieve high-efficiency, single mode lasing. This is possible in ABR lasers without a pi/2 phase shift in the outer grating when the device size is below a critical value.
Area of Science:
- Optics and Photonics
- Semiconductor Lasers
Background:
- Annular Bragg resonance (ABR) structures offer unique properties for laser design.
- Understanding modal properties is crucial for optimizing laser performance.
Purpose of the Study:
- To investigate the modal properties of ABR laser structures.
- To determine conditions for achieving high-efficiency, single mode lasing.
Main Methods:
- Derivation of the governing characteristic equation for ABR lasers.
- Numerical analysis of two types of ABR lasers (with and without pi/2 phase shift).
- Analysis of modal threshold gains and resonance frequencies.
Main Results:
- The characteristic equation was derived to calculate modal properties.
- Two ABR laser designs were analyzed: one with a pi/2 phase shift and one without.
- A large-area, high-efficiency, single defect mode was numerically demonstrated in ABR lasers without a pi/2 phase shift in the outer grating, below a critical device size.
Conclusions:
- The study provides insights into the modal behavior of ABR lasers.
- Specific design choices (no pi/2 phase shift, critical device size) are key for achieving desired lasing characteristics.
- This research contributes to the development of efficient, large-area single mode lasers.
