Time-stretch spectroscopy has the potential for high-speed inspection application. Currently, the low output power of chirped pulses limits the throughput and targets. We applied Arrayed Waveguide Gratings (AWGs) to time-stretch spectroscopy and achieved a high output power of 90 mW, which is about ten times higher than conventional method. In this study, we performed Near-Infrared (NIR) spectroscopy of low-transmittance samples with the developed time-stretch spectrometer. The absorbance spectrum of liquid samples was measured within ⪅1 ms/sample even with an optical attenuation by an ND filter (OD 3.8). In addition, we can estimate the volume fraction of highly scattering samples with a high accuracy (R2 = 0.996) in approximately 5 ms. This result demonstrates the potential of our spectrometer for quantitative spectral analysis of highly scattering samples.
Time-stretch spectroscopic method, employing chirped optical pulses, has significant attention due to its remarkable spectral acquisition rate. However, its application is limited due to the low light throughput and narrow bandwidth of previous time-stretching systems. We present a high-power time-stretch near-infrared (NIR) light source, leveraging Arrayed Waveguide Gratings (AWGs), designed to overcome these limitations. This novel configuration utilizes AWGs and short optical fibers to achieve significant chromatic dispersion with high throughput, yielding output power of 90 mW and spectral width of 400 nm. As a result, we clearly observed the absorption spectra for low transmittance samples within a millisecond. This represents a significant step forward for transmittance based industrial NIR spectroscopy applications.
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