Figure 2 | Scientific Reports

Figure 2

From: Near-infrared spectroscopy of low-transmittance samples by a high-power time-stretch spectrometer using an arrayed waveguide grating (AWG)

Figure 2

NIR spectroscopy of low-transmittance samples. (a) Schematic of the experimental setup. PD photodiode, OS oscilloscope. (b) Waveforms observed through liquid samples. We averaged 1000 successive waveforms for each sample extracted from the raw signal (Fig. S2). (c) Absorption spectrum of the samples measured by the developed spectrometer.

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