Abstract

Optical parametric generation in nonlinear crystals across the atmosphere transmission band II (3 – 5 µm) is of interest for various applications such as infrared spectroscopy or countermeasures. For an efficient parametric generation in this spectral range with well-developed ultrashort laser sources, we identified Langatate La₃Ga_5.5Ta_0.5O₁₄ (LGT) [1]. LGT is transparent from 0.25 up to 6.5 µm and can be grown in large sizes using the Czochralski method. Its unique nonlinear coefficient d₁₁=2.4 ± 0.4 pm/V at λ=0.67 µm as well as the refinement of the Sellmeier equations are reported in ref [1]. The study highlights the potential for LGT to generate broadband spectrum between 1.5 and 5 µm if pumped around 0.97 µm available from a Ti:Sapphire (Ti:Sa) laser.

© 2017 IEEE