Abstract
We study two-color high-order harmonic generation using an intense driving field and its weak second harmonic, crossed under a small angle in the focus. Employing sum- and difference-frequency generation processes, such a noncollinear scheme can be used to measure and control macroscopic phase matching effects by utilizing a geometrical phase mismatch component, which depends on the noncollinear angle. We further show how spatial phase effects in the generation volume are mapped out into the far field allowing a direct analogy with temporal carrier envelope effects in attosecond pulse generation.
Highlights
We study two-color high-order harmonic generation using an intense driving field and its weak second harmonic, crossed under a small angle in the focus
Other authors [19,20,21] concentrated on noncollinear sum-frequency generation (SFG) processes driven by two identical laser fields
We show that difference-frequency generation (DFG), where a photon is emitted in the conversion process, is in general more favorable than SFG [22], which becomes very inefficient with increasing noncollinear angle
Summary
We study two-color high-order harmonic generation using an intense driving field and its weak second harmonic, crossed under a small angle in the focus. By mixing the fundamental and a weak second harmonic at an angle, Bertrand and co-workers [17] demonstrated the spatial separation of multiple extreme ultraviolet (XUV) beams corresponding to different sets of absorbed photon numbers from the two fields.
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