| Date |
Do, 13.03.2014 - Do, 13.03.2014 |
| Time |
10.15 |
| Speaker |
Dr. Alexander Heidt, Optoelectronics Research Centre, University of Southampton, UK |
| Location |
Universität Bern, Institut für Angewandte Physik, Gebäude exakte Wissenschaften, Hörsaal B116, Sidlerstrasse 5, 3012 Bern |
| Program |
The mid-infrared (mid-IR) spectral region at wavelengths of 2 micron and beyond is increasingly becoming the center of attention in photonics as it promises a multitude of exciting new applications – from “molecular fingerprinting” to high-intensity physics on timescales of attoseconds. In this talk I will review our latest progress and results in the development and application of novel optical fibers and light sources for the emerging mid-IR waveband. At the heart of our approach are high power short- and ultrashort pulsed Thulium-doped fiber amplifier (TDFA) systems seeded by semiconductor laser diodes at 2 micron. The diode-seeding and the master oscillator power amplifier (MOPA) design allow for the construction of extremely versatile laser systems that can operate over wide ranges of peak power, pulse energy and repetition rate in the ultrashort picosecond to the long nanosecond pulsed regimes. We achieve a record peak power of 130 kW in picosecond mode, while demonstrating user-defined pulse-shaping capabilities at millijoule pulse energy levels in the nanosecond regime from essentially the same amplifier system. I will highlight recent results in the application of these MOPA systems and their high performance TDFA sub-components in such diverse application areas as next generation telecommunication networks, mid-IR supercontinuum generation and high sensitivity (sub-ppm) broadband spectroscopic gas sensing, using the latest generation of ultra-low-loss hollow-core photonic bandgap fibers, for environmental, security, and healthcare applications. Finally, I will present novel fiber designs based on soft glasses such as tellurite and chalcogenide that allow the efficient generation of ultrashort pulses with the duration as short as a single cycle of the light field in the mid-IR, forming the basis of ultrafast fiber optics at this waveband with intriguing prospects for spectroscopy, bio-photonic imaging and material science. |
| Download |
 (75 KB) |
|
(75 KB) |
| Link |
www.iap.unibe.ch |
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