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<p>A dual-wavelength monolithic Y-branch distributed Bragg reflector diode laser at 633&#xa0;nm is presented, which is suitable for shifted excitation Raman difference spectroscopy to effectively address fluorescence and background interference. The device provides 30&#xa0;mW optical output power at an electrical power consumption of less than 1&#xa0;W. At a spectral distance of 0.4&#xa0;nm (10&#xa0;cm<sup>−1</sup>), both laser emission wavelengths show narrowband operation with spectral widths of 12&#xa0;pm (0.3&#xa0;cm<sup>−1</sup>) and side mode suppression ratios of more than 40&#xa0;dB. Performing shifted excitation Raman difference spectroscopy measurements on a highly fluorescent soil sample exemplarily showed the efficient separation of characteristic Raman signals of the soil constituents quartz and calcite from intense fluorescence interference with a 17-fold improvement in the signal-to-background noise ratio in comparison to the individual Raman measurements.</p>

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Monolithic Y-branch distributed Bragg reflector diode laser at 633 nm for shifted excitation Raman difference spectroscopy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月7日

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  • Aghigh Jalehdoost,
  • Kay Sowoidnich,
  • André Müller,
  • David Feise,
  • Katrin Paschke,
  • Bernd Sumpf,
  • Martin Maiwald

摘要

A dual-wavelength monolithic Y-branch distributed Bragg reflector diode laser at 633 nm is presented, which is suitable for shifted excitation Raman difference spectroscopy to effectively address fluorescence and background interference. The device provides 30 mW optical output power at an electrical power consumption of less than 1 W. At a spectral distance of 0.4 nm (10 cm−1), both laser emission wavelengths show narrowband operation with spectral widths of 12 pm (0.3 cm−1) and side mode suppression ratios of more than 40 dB. Performing shifted excitation Raman difference spectroscopy measurements on a highly fluorescent soil sample exemplarily showed the efficient separation of characteristic Raman signals of the soil constituents quartz and calcite from intense fluorescence interference with a 17-fold improvement in the signal-to-background noise ratio in comparison to the individual Raman measurements.