Spectroscopy

Abstract

Abstract: Miniaturization of mid-infrared (MIR) spectroscopy sources has progressed signifi- cantly during the past two decades, but a solution able to provide full integration, high optical power and wide tuneability in the so-called atmospheric window (2.5 - 5 μm) is still missing. In this context, we investigated a broadband frequency-tuneable source relying on difference frequency generation (DFG) in a periodically poled lithium niobate (PPLN) ridge waveguide. By employing tuneable lasers for the pump and signal wavelengths emitting at around 1 μm and 1.55 μm, respectively, we were able to fully cover the ≈ 3 - 3.5 μm spectrum, thus translating the technological maturity of data communication photonic sources to the MIR wavelength band.

PDF Link: https://arxiv.org/pdf/2312.12548.pdf

Deuterium UV lamp for my DIY absorption spectrometer.

Nature chemistry link: https://www.nature.com/articles/s41557-023-01300-3

arXiv url: https://arxiv.org/pdf/2202.12330.pdf

Papayas can be male, female, or hermaphrodite. Usually, papaya growers will select hermaphrodites because they can self-fertilize and thus produce fruit by themselves. However, this selection takes time an resources because the plants have to flower before the sex can determined.

arXiv link