Picosecond optical parametric generation and amplification in LiB3O5 and β-BaB2O4

Abstract

In this letter, an optical parametric generation and amplification system including a type II noncritically phase‐matched LiB₃O₅ and a type I critically phase‐matched β‐BaB₂O₄ is reported. Pumped by 4.8 mJ 30 ps 355 nm laser pulse, 415.9–482.6 nm tunable wavelengths with linewidths as low as 0.15 nm have been obtained. System pump‐to‐signal energy conversion efficiency up to 32.7% with 1.57 mJ energy and 52 MW peak‐power single pulse have been achieved.