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Title: Output characteristics of organic distributed feedback lasers with varying grating heights

Abstract

In this study, we examine the influence of the corrugation height of surface relief gratings on the output characteristics of organic distributed feedback (DFB) lasers. A series of surface relief gratings with a constant corrugation period (410 nm) and variable corrugation heights ranging from 20 and 80 nm are fabricated by the illumination of a new developed photosensitive azobenzene containing material with an interference pattern. A blend of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo(2,1′,3)-thiadiazol)] and poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] is used as organic laser active material which is deposited by spin-coating onto the grating array. The investigation of the laser output characteristics reveals an increase of the slope efficiency by a factor of 4 from 0.8% to 3.7% due to an increase of the grating height. The laser threshold decreases only slightly from 8.5 μJ/cm{sup 2} to 6.0 μJ/cm{sup 2} with increasing corrugation height. We interpret this as a result of the change of coupling between light mode and grating. The study helps to relate this to loss mechanisms of the DFB lasing process. This enables a further optimization of the DFB laser design.

Authors:
; ;  [1]
  1. Fraunhofer Institut für Angewandte Polymerforschung, Geiselbergstr. 69, 14476 Potsdam (Germany)
Publication Date:
OSTI Identifier:
22303908
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 104; Journal Issue: 26; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COUPLING; EFFICIENCY; FEEDBACK; ILLUMINANCE; INTERFERENCE; LASERS; LOSSES; SPIN-ON COATING; SURFACES; VISIBLE RADIATION

Citation Formats

Döring, Sebastian, Rabe, Torsten, and Stumpe, Joachim. Output characteristics of organic distributed feedback lasers with varying grating heights. United States: N. p., 2014. Web. doi:10.1063/1.4885400.
Döring, Sebastian, Rabe, Torsten, & Stumpe, Joachim. Output characteristics of organic distributed feedback lasers with varying grating heights. United States. https://doi.org/10.1063/1.4885400
Döring, Sebastian, Rabe, Torsten, and Stumpe, Joachim. 2014. "Output characteristics of organic distributed feedback lasers with varying grating heights". United States. https://doi.org/10.1063/1.4885400.
@article{osti_22303908,
title = {Output characteristics of organic distributed feedback lasers with varying grating heights},
author = {Döring, Sebastian and Rabe, Torsten and Stumpe, Joachim},
abstractNote = {In this study, we examine the influence of the corrugation height of surface relief gratings on the output characteristics of organic distributed feedback (DFB) lasers. A series of surface relief gratings with a constant corrugation period (410 nm) and variable corrugation heights ranging from 20 and 80 nm are fabricated by the illumination of a new developed photosensitive azobenzene containing material with an interference pattern. A blend of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo(2,1′,3)-thiadiazol)] and poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] is used as organic laser active material which is deposited by spin-coating onto the grating array. The investigation of the laser output characteristics reveals an increase of the slope efficiency by a factor of 4 from 0.8% to 3.7% due to an increase of the grating height. The laser threshold decreases only slightly from 8.5 μJ/cm{sup 2} to 6.0 μJ/cm{sup 2} with increasing corrugation height. We interpret this as a result of the change of coupling between light mode and grating. The study helps to relate this to loss mechanisms of the DFB lasing process. This enables a further optimization of the DFB laser design.},
doi = {10.1063/1.4885400},
url = {https://www.osti.gov/biblio/22303908}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 26,
volume = 104,
place = {United States},
year = {Mon Jun 30 00:00:00 EDT 2014},
month = {Mon Jun 30 00:00:00 EDT 2014}
}