Abstract
Complementary pair of dispersive multilayers operating in the 2-4 µm spectral range were designed and produced for the first time. The mirrors comprise layers of Si and SiO2 thin-film materials. The pair exhibits unparalleled reflectance exceeding 99.7% and provides a group delay dispersion of (-200) fs2. The mirrors can be used in Cr:ZnS/Cr:ZnSe femtosecond lasers and amplifiers.
Highlights
Dispersive mirrors (DM) are being actively used for dispersion compensation within laser systems and manipulation of ultrashort pulses in a number of laser applications [1,2,3,4,5]
The novel technology based on 2.4 μm chromium doped zinc sulfide (Cr:ZnS) or chromium doped zinc selenide (Cr:ZnSe) will allow one to extend the laser output to 3.2 μm [8,9]
Exploitation of the thin-film combinations typical for the visible-near-infrared spectral range cannot provide large negative group delay dispersion (GDD) values required for the development of Cr:ZnS/Cr:ZnSe lasers since oscillations in GDD reach too high inacceptable values
Summary
Dispersive mirrors (DM) are being actively used for dispersion compensation within laser systems and manipulation of ultrashort pulses in a number of laser applications [1,2,3,4,5]. For further development of this technology, dispersive mirrors in the spectral range 2-4 μm are strongly demanded. The step in the development of infrared dispersive optics was done: a complementary pair of DMs operating in the entire 2-4 μm spectral range was designed and produced. Exploitation of the thin-film combinations typical for the visible-near-infrared spectral range (for example, Nb2O5/SiO2, Ta2O5/SiO2, TiO2/SiO2) cannot provide large negative GDD values required for the development of Cr:ZnS/Cr:ZnSe lasers since oscillations in GDD reach too high inacceptable values. [10] is that the complimentary pair approach was developed and applied for Si/SiO2 technology for the first time Due to this approach, unprecedented large GDD values can be compensated in the Cr:ZnS/Cr:ZnSe lasers.
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