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- W3131088618 abstract "Relative intensity noise (RIN) inherent in fiber lasers poses a serious obstacle to their use in pump–probe spectroscopy and imaging. RIN can be removed through an analog balanced detector, or, as we have previously shown, software adaptive noise cancellation (ANC) on digitized signals. One major drawback to software ANC is the added time required for digitizing and post-processing. In this article, we describe a design for ANC on a field-programmable gate array (FPGA), making use of high-level synthesis tools and fixed-point arithmetic to achieve real-time laser RIN suppression at 25 MHz sample rates. Unlike the software-ANC approach, the FPGA-ANC device can serve as a dedicated drop-in denoiser, placed between the detectors and a commercial lock-in amplifier. We demonstrate its application to transient absorption spectroscopy and microscopy, lowering the noise floor to ∼17 dB above the shot noise limit. Furthermore, we demonstrate a dramatic improvement in data acquisition time from ∼6 h to ∼5 min in a real-time imaging scenario." @default.
- W3131088618 created "2021-03-01" @default.
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- W3131088618 date "2021-02-01" @default.
- W3131088618 modified "2023-09-25" @default.
- W3131088618 title "DR-RINS: Digital real-time relative intensity noise suppressor for pump–probe spectroscopy and microscopy" @default.
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- W3131088618 doi "https://doi.org/10.1063/5.0032376" @default.
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