Nd-ultraphosphate laser

Abstract

Laser action at λ=1.051 μm with a bandwidth of 1.4 nm is reported in a 35-μm-thick platelet of a neodymium-ultraphosphate crystal (NdUP) placed within an optical resonator. Longitudinally pumped with a pulsed rhodamine 6G laser (λ=0.58 μm) the room-temperature threshold was 40 μJ and the quantum efficiency slope was ∼18%. Also in glass of the same chemical composition laser action was observed.