Similar title to Roberts, Ann, Ampem-Lassen, Eric, Barty, Anton, Nugent, Keith A, Baxter, Gregory W, Dragomir, Nicoleta and Huntington, Shane (2002) Refractive-index profiling of optical fibers with axial symmetry by use of quantitative phase microscopy. Optics letters, 27 (23). pp. 2061-2063. ISSN 0146-9592