Stimulated Raman Scattering (SRS) in α‐AlOOH (Diaspore). Issue 11 (16th September 2021)

• Record Type: Journal Article
• Authors: Bohatý, Ladislav; Lux, Oliver; Eichler, Hans‐Joachim; Rhee, Hanjo; Kaminskii, Alexander A.; Becker, Petra
• Is Part Of: Crystal research and technology. Volume 56:Issue 11(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-16
• Subjects: α‐AlOOH -- broadband lasing comb generation -- diaspore -- stimulated Raman scattering; Crystallography -- Periodicals; 548
• DOI: 10.1002/crat.202100055
• Languages: English
• ISSNs: 0232-1300

Abstract

Abstract: In single crystals of orthorhombic α‐AlOOH, known also as mineral diaspore, χ (3) ‐nonlinear lasing by stimulated Raman scattering (SRS) and Raman‐induced four‐wave mixing (RFWM) is investigated. Picosecond pumping at 1.064 µm wavelength produces a broadband Stokes and anti‐Stokes frequency comb with up to 25 SRS‐ and RFWM‐generated emission lines. All observed Stokes and anti‐Stokes lasing components in the visible and near‐IR are identified and attributed to a single SRS‐promoting vibration mode with ω SRS ≈ 445 cm −1 . The first Stokes steady‐state Raman gain coefficient in the visible spectral range is estimated to a value not less than 0.36 cm GW −1 . Abstract : Orthorhombic α‐AlOOH, known as natural crystal diaspore, is presented as a new stimulated Raman scattering (SRS)‐active crystal. With picosecond laser pumping high‐order Raman‐induced χ (3) generation is observed. The registered Stokes and anti‐Stokes sidebands are identified and attributed to the SRS‐promoting phonon mode A1g of AlO3 (OH)3 octahedral groups, with ω SRS ≈ 445 cm −1 .