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SHG by incoherent conical pump

VSHG

The generation of coherent SH beam by incoherent conical pump beams is possible. One of the conical pump beams can be asimuthally as well as radially incoherent. The second pump beam must be radially coherent but it can preserve the asimuthal incoherence. Then the angular spectrum of the SH beam is a narrowband spot and its width decreases with the crystal length.