X-Ray Second Harmonic Generation

Authors

S. Shwartz, Bar Ilan UniversityFollow
Matthias Fuchs, University of Nebraska-LincolnFollow
J. B. Hastings, SLAC National Accelerator Laboratory, Menlo Park, CaliforniaFollow
Y. Inubushi, RIKEN SPring-8 Center
T. Ishikawa, RIKEN SPring-8 Center,
T. Katayama, Japan Synchrotron Radiation Research Institute
D. A. Reis, Stanford University
T. Sato, RIKEN SPring-8 Center
K. Tono, Japan Synchrotron Radiation Research Institute
M. Yabashi, RIKEN SPring-8 Center,
S. Yudovich, Bar Ilan University
S. E. Harris, Stanford UniversityFollow

Date of this Version

4-22-2014

Document Type

Article

Citation

PHYSICAL REVIEW LETTERS 112, 163901 (2014)
DOI: 10.1103/PhysRevLett.112.163901

Comments

Copyright (c) 2014 American Physical Society. Used by permission.

Abstract

We report clear experimental evidence for second harmonic generation at hard x-ray wavelengths. Using a 1.7 Å pumping beam generated by a free electron laser, we observe second harmonic generation in diamond. The generated second harmonic is of order 10 times the background radiation, scales quadratically with pump pulse energy, and is generated over a narrow phase-matching condition. Of importance for future experiments, our results indicate that it is possible to observe nonlinear x-ray processes in crystals at pump intensities exceeding 10¹⁶ W/cm².