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Gain new optical measurement method developed for next-generation laser foundation
- Jul 29, 2014 -

Gain new optical measurement method developed for next-generation laser foundation

Laser scientists from Vienna University of Technology is part of the distant universe to find a weak but repeated light signal, a signal hope to identify those aliens sent.

Researchers from North Carolina State University has developed a method to more accurately measure the MEH-PPV polymer optical amplification efficiency, it laid the foundation for the development of a new generation of lasers and photonic devices.

Senior author of the School of Materials Science and Engineering Associate Professor Dr.-related research papers Lewis Reynolds said that by increasing understanding of this material can be achieved more quickly take advantage of MEH-PPV to develop cheaper, more flexible long-term goal of photonic devices.

MEH-PPV is an available integrated with a low-cost silicon polymer; years researchers have been seeking to use this material converts electricity into light amplifiers and other photonic devices and chemical sensors used in lasers.

The current problem to be solved is the MEH-PPV "optical gain", which is a measure of the light amplification efficiency of the material used. Optical gain understanding of the material is the key to advancing laser research.

The researchers converted by the laser pulse wave pumped into the material, and then measure the light MEH-PPV produced subsequent to determine the optical gain.

The research team used a very short laser pulses, laser pulses 10 times / second, each pulse lasting only 25 picoseconds (a picosecond is one trillionth of a second).

Previously used to determine the optical gain MEH-PPV method ineffective, because after using the duration of the laser pulse to grow a thousand times. The long pulse will cause MEH-PPV appears hot downgrade, leading to structural and molecular composition of the material change.

Essentially, using long pulses equivalent to heating the polymer; the use of picosecond pulses minimizes thermal effects downgraded, resulting in more accurate measurement results.

The researchers said that the new method is very simple, can be easily applied to any other area.