Info
Info
News Article

Measuring Light Amplification With Polymers For Next Generation Lasers

Using picosecond laser pulses diminishes thermal degradation to get a more accurate measurement of a material’s optical gain; this is vital for laser development
Researchers from North Carolina State University have developed more accurate measurements of how efficiently a polymer called MEH-PPV amplifies light.

This should advance efforts to develop a new generation of lasers and photonic devices.

“By improving our understanding of this material, we get closer to the longstanding industry goal of using MEH-PPV to create cheaper, more flexible photonic technologies," says Lewis Reynolds, a teaching associate professor of materials science and engineering at NC State and senior author of a paper describing the research.

MEH-PPV is a low-cost polymer that can be integrated with silicon chips, and researchers have long sought to use the material to convert electricity into laser light for use in photonic devices such as optical amplifiers and chemical sensors.

At issue is MEH-PPV’s 'optical gain,' which is a way of measuring how effectively a material can amplify light. Understanding a material’s optical gain is essential to laser development.

Researchers determine the optical gain of MEH-PPV by pulsing laser light into the material and measuring the light that the MEH-PPV then produces in response.

The NC State team used extremely short laser pulses – 10 laser pulses per second, with each pulse lasting only 25 picoseconds (25 trillionths of a second).

Previous efforts to determine MEH-PPV’s optical gain produced inaccurate results because they used laser pulses that lasted one thousand times longer.

“The longer pulses caused thermal degradation in the MEH-PPV, meaning they led to structural and molecular changes in the material," says Zach Lampert, a former Ph.D. student at NC State and lead author of the paper. “Essentially, the longer laser pulses were heating the polymer. We were able to minimise these thermal degradation effects, and get a more accurate measurement, by using the picosecond pulses."

“Our new approach is fairly straightforward and can be easily implemented elsewhere," Reynolds says.

This work is described in detail in the paper, “Intrinsic optical gain in thin films of a conjugated polymer under picosecond excitation," by Zach E. Lampert et al in Applied Physics Letters,103, 033303 (2013).     DOI: 10.1063/1.4816040

 



AngelTech Live III: Join us on 12 April 2021!

AngelTech Live III will be broadcast on 12 April 2021, 10am BST, rebroadcast on 14 April (10am CTT) and 16 April (10am PST) and will feature online versions of the market-leading physical events: CS International and PIC International PLUS a brand new Silicon Semiconductor International Track!

Thanks to the great diversity of the semiconductor industry, we are always chasing new markets and developing a range of exciting technologies.

2021 is no different. Over the last few months interest in deep-UV LEDs has rocketed, due to its capability to disinfect and sanitise areas and combat Covid-19. We shall consider a roadmap for this device, along with technologies for boosting its output.

We shall also look at microLEDs, a display with many wonderful attributes, identifying processes for handling the mass transfer of tiny emitters that hold the key to commercialisation of this technology.

We shall also discuss electrification of transportation, underpinned by wide bandgap power electronics and supported by blue lasers that are ideal for processing copper.

Additional areas we will cover include the development of GaN ICs, to improve the reach of power electronics; the great strides that have been made with gallium oxide; and a look at new materials, such as cubic GaN and AlScN.

Having attracted 1500 delegates over the last 2 online summits, the 3rd event promises to be even bigger and better – with 3 interactive sessions over 1 day and will once again prove to be a key event across the semiconductor and photonic integrated circuits calendar.

So make sure you sign up today and discover the latest cutting edge developments across the compound semiconductor and integrated photonics value chain.

REGISTER FOR FREE

VIEW SESSIONS

Info
×
Search the news archive

To close this popup you can press escape or click the close icon.
×
Logo
×
Register - Step 1

You may choose to subscribe to the Compound Semiconductor Magazine, the Compound Semiconductor Newsletter, or both. You may also request additional information if required, before submitting your application.


Please subscribe me to:

 

You chose the industry type of "Other"

Please enter the industry that you work in:
Please enter the industry that you work in:
 
X
Info
X
Info
{taasPodcastNotification}
Live Event