Study of difference frequency generation and optical parametric amplification in La3Ga5.5Ta0.5O14 in the femtosecond regime

Summary form only given. 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 La
₃
Ga
_5.5
Ta
_0.5
O
₁₄
(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 d
₁₁
=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.