High-resolution, high-efficiency narrowband spectroscopy with an s-p-phased holographic grating in double pass

Open Access

Fig. 4

VPH in double pass. The grating is placed in Littrow, implying that α₀ = β₀ for λ_cen. We can see that for wavelengths other than λ_cen, they will hit the grating at an angle different from α₀ at the second pass. How much these rays are off-Littrow is determined by the single-pass dispersion (Eq. (4)).

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