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Figure 1

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

Figure 1

AWG-based high-power time-stretch spectroscopy. (a) Schematic of the developed spectrometer. The relationship between the optical spectrum and the pulse waveform is shown in the bottom row. SC supercontinuum, AWG arrayed waveguide grating, PD photodiode, ADC analog-to-digital converter. (b) Transmittance spectra of the AWG (61 output channels) in 900–1300 nm wavelength range. (c) Pulse waveforms measured without (gray) and with (blue) a standard reference material. (d) Measured absorption spectrum of the standard material (circles). The reference spectrum provided by NIST is also shown as dashed lines. The error bars represent the standard deviation of absorbance (± 1σ). The experimental conditions are given in the “Methods” section.

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