title: Lasing of surface-polished polycrystalline Ho: YAG (yttrium aluminum garnet) fiber.
abstract: A polycrystalline 1.5% Ho: YAG fiber with a diameter of 31 µm was prepared. Surface roughness from grain boundary grooving was reduced by polishing, which decreased the fiber scattering coefficient from 76 m-1to 35 m-1. Lasing tests were done on this fiber with a SF57 Schott glass cladding. Lasing was confirmed by spectrum narrowing with threshold pump power lower than 500 mW and a slope efficiency of 7%. To our knowledge, this is the first lasing demonstration from a small diameter polycrystalline ceramic fiber.
authors.forename: Hyunjun
authors.initials: H
authors.lastname: Kim
authors.forename: Randall S
authors.initials: RS
authors.lastname: Hay
authors.forename: Sean A
authors.initials: SA
authors.lastname: McDaniel
authors.forename: Gary
authors.initials: G
authors.lastname: Cook
authors.forename: Nicholas G
authors.initials: NG
authors.lastname: Usechak
authors.forename: Augustine M
authors.initials: AM
authors.lastname: Urbas
authors.forename: Kathleen N
authors.initials: KN
authors.lastname: Shugart
authors.forename: HeeDong
authors.initials: H
authors.lastname: Lee
authors.forename: Ali H
authors.initials: AH
authors.lastname: Kadhim
authors.forename: Dean P
authors.initials: DP
authors.lastname: Brown
authors.forename: Benjamin
authors.initials: B
authors.lastname: Griffin
authors.forename: Geoff E
authors.initials: GE
authors.lastname: Fair
authors.forename: Randall G
authors.initials: RG
authors.lastname: Corns
authors.forename: Santeri A
authors.initials: SA
authors.lastname: Potticary
authors.forename: Frank K
authors.initials: FK
authors.lastname: Hopkins
authors.forename: Kent L
authors.initials: KL
authors.lastname: Averett
authors.forename: David E
authors.initials: DE
authors.lastname: Zelmon
authors.forename: Triplicane A
authors.initials: TA
authors.lastname: Parthasarathy
authors.forename: Kristin A
authors.initials: KA
authors.lastname: Keller