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Researchers from Institut National de la Recherche Scientifique (INRS) in Quebec City have introduced a method for tuning a laser’s spectrum to the infrared range. In collaboration with international partners, a team led by Luca Razzari used a hollow-core fiber filled with nitrogen to deliver optical pulses shorter than those delivered by the input laser, and with a high spatial quality.
Existing ultrafast laser technologies are not, or not easily tunable, in the infrared range, requiring nonlinear processes, stages, and/or components to shift emission wavelengths.
Commonly, hollow-core fibers contain monatomic gases, such as argon, to symmetrically broaden a laser spectra and then recompress them into compressed optical…READ MORE