Quantum cascade lasers with Y_2O_3 insulation layer operating at 81 µm Kang, JoonHyun ; Yang, Hyun-Duk ; Joo, Beom Soo ; Park, Joon-Suh ; Lee, Song-ee ; Jeong, Shinyoung ; Kyhm, Jihoon ; Han, Moonsup ; Song, Jin Dong ; Han, Il Ki Abstract Publication: Optics Express Pub Date: August 2017 DOI: 10.1364/OE.25.019561 Bibcode: 2017OExpr..2519561K