This system demonstrates improved side-mode suppression and spectral tunability, suggesting advantages for nonlinear optical applications.
We demonstrate a dual-wavelength broad-area diode laser system with narrow linewidth and wide spectral tunability using a composite external cavity comprising a volume Bragg grating and a Littrow-type transmission grating. One wavelength is stabilized at 780.25 nm with a linewidth of ~0.13 nm, while the other achieves a continuous tuning range of 772.24–786.43 nm with a linewidth of ~0.17 nm. The system exhibits a side-mode suppression ratio exceeding 20 dB across the entire tuning range. At a dual-wavelength separation of 4.29 nm, the total output power reaches 2.62 W. Additionally, we successfully validate the system’s potential for nonlinear optical applications.
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Zhao et al. (2025) studied this question.
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