Long wavelength mid-infrared from mixing two colors from a fiber amplifier

Siyuan Bian; Sébastien Loranger; Raman Kashyap; Donna Strickland

doi:10.1117/12.2178022

22 May 2015 Long wavelength mid-infrared from mixing two colors from a fiber amplifier

Siyuan Bian, Sébastien Loranger, Raman Kashyap, Donna Strickland

Proceedings Volume 9467, Micro- and Nanotechnology Sensors, Systems, and Applications VII; 94672J (2015) https://doi.org/10.1117/12.2178022
Event: SPIE Defense + Security, 2015, Baltimore, MD, United States

Abstract

At Waterloo, we are developing a high power, short pulse, two-color, Yb:fiber amplifier system to generate the long wavelength (<15μm) side of the molecular fingerprint spectral region, by difference frequency mixing the two colors. This spectral region is important for trace gas detection of explosives. As an example, it has been shown that the strong spectroscopic signatures of a peroxide-based explosive triacetone triperoxide (TATP) occur between 15 and 20 μm. To date, we have achieved a tuning range from 16 to 20 μm with a maximum average power of 1.7 mW. On the short wavelength side, the two colors would need to be pulled further apart, which requires a higher power seed to beat the amplified spontaneous emission that appears at the gain peak of the amplifiers between the two seed colors. On the long wavelength side, we are limited to 20 μm by the transparency region of the nonlinear crystals. We would like to find new nonlinear materials that have transparency from 1 to 30μm. If we could generate wavelengths from 15 to 30 μm with sufficient power, we could extend the spectral region to also cover 8 to 15μm by frequency doubling the longer wavelengths. We are currently working on replacing bulk optics in the system with fiber based optical elements to select the wavelengths as well as stretch and recompress the pulses in order to make the system compact and stable.

Citation Download Citation

Siyuan Bian, Sébastien Loranger, Raman Kashyap, and Donna Strickland "Long wavelength mid-infrared from mixing two colors from a fiber amplifier", Proc. SPIE 9467, Micro- and Nanotechnology Sensors, Systems, and Applications VII, 94672J (22 May 2015); https://doi.org/10.1117/12.2178022

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KEYWORDS

Mid-IR

Fiber lasers

Optical isolators

Amplifiers

Fiber amplifiers

Optical amplifiers

Fiber Bragg gratings

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