[23a-C302-1~9] 3.7 Optical measurement, instrumentation, and sensor (formerly 3.8)

[23a-C302-5] Enhancement of Dynamic Range in Noise Cancelation of Supercontinuum Light by Spatial and Temporal Dispersions of Photon-flux on Photodiode

〇Keisuke Seto¹, Takayoshi Kobayashi², Eiji Tokunaga¹ (1.Tokyo Univ. Sci., 2.Univ. Electro-Commun.)

Keywords:Stimulated Raman Spectroscopy, Supercontinuum light, Noise canceling

Stimulated Raman spectroscopy (SRS) allows a high signal-to-noise ratio, enabling rapid detection, such as in chemical imaging. However, the requirement of low-noise laser sources for multiple wavelength pulses prevents the application of SRS to a broader range of fields. To lower cost and simplify the system, we have developed a noise cancellation method for a simple and low-cost but highly noisy supercontinuum light source. The dynamic range could be improved by increasing the pulse width and dispersing the photon flux incident on the photodiode in the time domain. In this presentation, we will further attempt to improve the dynamic range by increasing the active area of the photodiode to disperse the photon flux in the spatial domain.