Double-range (λ = 2.6–2.9 and 4.9–6.0 μm) slab RF discharge CO laser system with intracavity frequency conversion in temperature-controlled ZnGeP2 crystal

• Published in: Optics and laser technology 2022-04, Vol.148, p.107777, Article 107777
• Main Authors: Ionin, A.A., Kinyaevskiy, I.O., Klimachev, Yu.M., Kotkov, A.A., Kozlov, A.Yu, Sagitova, A.M., Sinitsyn, D.V., Rulev, O.A.
• Format: Article
• Language: English
• Subjects: Carbon monoxide; CO laser; Crystals; Intracavity frequency conversion; Lasers; mid-IR laser; Non-linear optics; Phase matching; Radio frequency discharge; RF discharge-pumped lasers; Room temperature; Slab RF discharge; Temperature phase-matching tuning; ZnGeP2 crystal
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2021.107777

•Intracavity sum-frequency generation in a slab RF discharge CO laser with a ZnGeP2 nonlinear crystal.•A compact slab RF discharge CO laser simultaneously operating within two wavelength ranges.•Spectrum shifting by temperature phase-matching tuning of an intracavity ZnGeP2 nonlinear crystal. Temperature phase-matching tuning in a ZnGeP2 nonlinear crystal under intracavity CO laser sum-frequency generation (SFG) was for the first time carried out. This slab RF discharge CO laser with the intracavity frequency conversion simultaneously operated within two wavelength ranges of ∼ 2.6–2.9 and ∼ 4.9–6.0 μm. The SFG conversion efficiency was up to 2.9 ± 0.1%. The crystal heating from the room temperature up to 115 °C resulted in the SFG spectrum shifting towards the short-wavelength range and in the spectrum width and the number of SFG lines decrease.