Negative axicon tip-based fiber optic interferometer cavity sensor for volatile gas sensing Kanawade, Rajesh ; Kumar, Ajay ; Pawar, Dnyandeo ; Vairagi, Kaushal ; Late, Dattatray ; Sarkar, Sudipta ; Sinha, Ravindra K. ; Mondal, Samir Abstract Publication: Optics Express Pub Date: March 2019 DOI: 10.1364/OE.27.007277 Bibcode: 2019OExpr..27.7277K