Synchronized subharmonic modulation in stimulated emission microscopy | Zendy

Subir Das | Zendy; Yi-Chih Liang | Zendy; Shunji Tanaka | Zendy; Yasuyuki Ozeki | Zendy; FuJen Kao | Zendy

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Synchronized subharmonic modulation in stimulated emission microscopy

Author(s) -

Subir Das,

Yi-Chih Liang,

Shunji Tanaka,

Yasuyuki Ozeki,

FuJen Kao

Publication year - 2019

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.27.027159

Subject(s) - optics , laser , modulation (music) , frequency modulation , sapphire , noise (video) , signal (programming language) , synchronization (alternating current) , materials science , physics , optoelectronics , telecommunications , computer science , acoustics , bandwidth (computing) , channel (broadcasting) , artificial intelligence , image (mathematics) , programming language

In this work, we have demonstrated a stimulated emission (SE)-based pump-probe microscopy with subharmonic fast gate synchronization, which allows over an order of magnitude improvement in signal-to-noise ratio. Critically, the alternative way of modulation is implemented with the highest possible frequency that follows the lasers' repetition rate. Its working is based on a homemade frequency divider that divides the repetition frequency (76 MHz) of the Ti:sapphire (probe) laser to half of the repetition frequency, 38 MHz, which is used to synchronously drive the pump laser and to provide the reference signal for the ensuing lock-in detection. In this way, SE can be detected with sensitivity reaching the theoretical (shot noise) limits, with a much lower time constant (0.1 ms) for faster image acquisition.

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