Abstract
We report a challenging design, fabrication and post-production characterization problem of a dispersive mirror supporting the spectral range from 2000 nm to 2200 nm and providing a group delay dispersion of -1000 fs2. The absolute reflectance in the working range is over 99.95%. The reported mirror is a critical element for Tm and Ho based lasers and paves the way for the development of ultrafast 2 µm lasers with sub-100 fs pulse duration.
Highlights
The mid-infrared fingerprint spectral region (2-20 μm) is important for numerous spectroscopy applications [1]
We report a challenging design, fabrication and post-production characterization problem of a dispersive mirror supporting the spectral range from 2000 nm to 2200 nm and providing a group delay dispersion of −1000 fs2
The absolute reflectance in the working range is over 99.95%
Summary
The mid-infrared fingerprint spectral region (2-20 μm) is important for numerous spectroscopy applications [1]. We concentrate on design, production and optical characterization of a dispersive mirror (DM) providing high reflectance and a group delay dispersion (GDD) of −1000 fs in the range from 2000 nm to 2200 nm. Is this spectral range broader and deeper towards the infrared than [10], but more importantly, we achieved the required specification using only a single DM. This will allow a more accurate design for future DMs in this wavelength range.
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