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Folding flexible co-extruded all-polymer multilayer distributed feedback films to control lasing
James H Andrews1, Michael Crescimanno, Nathan J Dawson
1Dept. of Physics & Astronomy, Youngstown State Univ., Youngstown, Ohio 44555, USA. jandrews@ysu.edu
Optics Express
|July 10, 2012
Summary
Researchers improved polymer laser performance by folding the defect layer. This method tunes output wavelength and increases laser efficiency 3- to 6-fold.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Distributed feedback (DFB) lasers are crucial for wavelength-selective light emission.
- Controlling the spectral properties and gain in polymer DFB lasers remains a challenge.
Purpose of the Study:
- To enhance gain and spectral control in all-polymer multilayer DFB lasers.
- To investigate the effect of folding and modifying the center defect layer on laser performance.
Main Methods:
- Co-extrusion of all-polymer multilayer structures.
- Deliberate folding and experimental terracing of the center defect layer.
- Characterization of lasing wavelength tuning and efficiency.
Main Results:
- Achieved tunable lasing wavelength across a ~25 nm reflection stop-band in discrete steps.
- Demonstrated a 3- to 6-fold increase in lasing efficiency compared to non-folded samples.
- Observed a lower lasing threshold due to the increased density of states at the defect.
Conclusions:
- Folding and modifying the defect layer is an effective strategy for tuning polymer DFB laser wavelengths.
- This approach significantly boosts laser efficiency and lowers the lasing threshold.
- The findings offer a new pathway for developing advanced polymer-based laser devices.
