Phase-Matched Generation of Coherent Soft X-rays

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Science  29 May 1998:
Vol. 280, Issue 5368, pp. 1412-1415
DOI: 10.1126/science.280.5368.1412

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Phase-matched harmonic conversion of visible laser light into soft x-rays was demonstrated. The recently developed technique of guided-wave frequency conversion was used to upshift light from 800 nanometers to the range from 17 to 32 nanometers. This process increased the coherent x-ray output by factors of 102 to 103 compared to the non–phase-matched case. This source uses a small-scale (sub-millijoule) high repetition-rate laser and will enable a wide variety of new experimental investigations in linear and nonlinear x-ray science.

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