Transferred electron photoemission to 1.65 μ from an InGaAsP heterojunction cathode

Abstract
Photoemission to 1.65 μ from a field‐assisted heterojunction cathode has been achieved for the first time. The all‐LPE‐grown cathode consists of a p‐type InGaAs photon‐absorbing electron‐generating layer, lattice matched to a p‐type InGaAsP transferred‐electron photoelectron‐emitting layer. Reflection‐mode quantum yield of ∼0.1% at 1.55 μ has been measured at 125 K.