10.1364/OL.39.006549.m002 Osamu Matoba Osamu Matoba Hiroki Inokuchi Hiroki Inokuchi Kouichi Nitta Kouichi Nitta Yasuhiro Awatsuji Yasuhiro Awatsuji Media 2: Optical voice recorder by off-axis digital holography Optica Publishing Group 2014 holography off-axi media Optical 15 November 2014 Optics Letters 2014-11-15 00:00:00 Media https://opticapublishing.figshare.com/articles/media/Media_2_Optical_voice_recorder_by_off-axis_digital_holography/4919963 Originally published in Optics Letters on 15 November 2014 (ol-39-22-6549)