High-resolution confocal detection of nanometric displacement by use of a 2 X 1 optical fiber coupler

Joon Ho Bae, Ki Hyun Kim, Mun Heon Hong, Chang Hun Gim, Wonho Jhe, ”High-resolution confocal detection of nanometric displacement by use of a 2 X 1 optical fiber coupler”, Opt. Lett. 25 (23), 1696-1698 (2000)