Related Experiment Video
Updated: Jul 3, 2026
09:38
Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
Longitudinal coherence of organic-based microcavity lasers
Andrea Camposeo1, Luana Persano, Pompilio Del Carro
1National Nanotechnology Laboratory of INFM-CNR,c/o Distretto Tecnologico, Università del Salento, via Arnesano, I-73100 Lecce, Italy. andrea.camposeo@unile.it
Optics Express
|July 9, 2008
Summary
Researchers measured the coherence length of organic lasers, finding it increases with pumping power but is limited by material degradation. This offers insights for improving organic laser performance.
Area of Science:
- Optics and Photonics
- Materials Science
- Organic Electronics
Background:
- Organic microcavity lasers offer potential for low-cost, flexible photonic devices.
- Understanding the coherence properties of these lasers is crucial for their practical application.
Purpose of the Study:
- To measure the longitudinal coherence length of organic microcavity lasers.
- To investigate the transition from spontaneous emission to lasing.
- To identify factors limiting coherence length at high pumping fluences.
Main Methods:
- Utilized a modified Michelson interferometer for single-shot coherence length measurements.
- Employed a conjugated polymer as the gain medium in the microcavity.
- Varied pumping fluence to observe changes in laser coherence.
Main Results:
- Coherence length increased with pumping fluence, reaching approximately 45 micrometers above threshold.
- A saturation in coherence length was observed at higher fluences.
- Thermal effects and photo-oxidation were identified as potential limiting factors.
Conclusions:
- The study provides critical data on the coherence properties of polymer-based organic lasers.
- Results highlight the importance of material stability for achieving high-performance organic lasers.
- Findings can guide the optimization of organic microcavity laser design and fabrication.
More Related Videos
Related Concept Videos
01:28Standing Waves in a Cavity
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
01:16Confocal Fluorescence Microscopy
Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
01:18Imaging Biological Samples with Optical Microscopy
Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...