Electrically excited organic diode emits coherent green light

May 1, 2007
In a potentially important development in green lasers, researchers at Interferometric Optics (Rochester, NY) have created an electrically excited organic-semiconductor device that emits coherent, highly directional light at 545 nm.

In a potentially important development in green lasers, researchers at Interferometric Optics (Rochester, NY) have created an electrically excited organic-semiconductor device that emits coherent, highly directional light at 545 nm. The researchers have tested the device to confirm its coherent properties; because the device as yet emits only nanowatts of power, an interferometric approach is used to measure linewidth.

The emitter, an organic light-emitting diode, comprises two semiconductor regions doped with Coumarin 545 T dye bracketed by a mirror cathode and an output coupler. To test linewidth, a 150-µm-wide slit is placed immediately in front of the emitter; 130 mm away along the optical axis, dual slits 50 µm wide and 50 µm apart provide the interferometric test. The high measured interferogram visibility of 0.90 approaches that of lasers and is consistent with a broadband (11 nm) dye-laser emission. “To call it a laser in the conventional sense, we need to get inside the submicron cavity and do the usual parametric studies that we do with a laser,” says Frank Duarte, one of the researchers. “This has not been done yet.” Contact Duarte at [email protected].

Sponsored Recommendations

Achromatic Lenses: High-Quality Custom Optics

March 13, 2025
Ensure clarity and accuracy in your optics systems with Lacroix’s achromatic lenses. Explore how our custom solutions minimize chromatic aberration for perfect results.

Manufacturing Considerations for Tolerancing Aspheres

March 13, 2025
Understand the critical factors in manufacturing aspheres and how Lacroix Optics ensures precise tolerancing in every optical component.

Explore Our Videos: Insights into Precision Optics

March 13, 2025
Get an inside look at Lacroix Optics with our collection of informative videos showcasing our capabilities, innovations, and processes.

Optical Assemblies: Reliable and Precise Solutions

March 13, 2025
Ensure your optical system works seamlessly with Lacroix Optics' custom optical assemblies. Discover the precision and reliability we bring to every project.

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!