Abstract

Shifted excitation Raman difference spectroscopy (SERDS) with alternating dual-wavelength excitation enables extracting Raman signals that provide molecular target information from background disturbances such as ambient light and fluorescence [1]. Simultaneous dual-wavelength emission is needed for the generation of THz emission to obtain structural target information [2]. A diode laser suitable for such applications should provide dual-wavelength laser emission with a few hundred milliwatts in the near-infrared spectral range. At 785 nm, Y-branch distributed Bragg reflector (DBR) diode lasers have been presented and applied but showed a power-dependent beam steering [3]. Dual-wavelength multi-mode inference (MMI) based devices without beam steering have been presented as a suitable alternative [4].

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