Abstract

The picosecond parametric amplification of a polychromatic image with a wavelength bandwidth of 140 nm and a gain of 15 dB has been obtained in a lithium triborate type-I crystal (LBO). Approximately 8 lines/mm in both lateral dimensions were resolved in the crystal plane. This resolution value is in good agreement with a numerical study of the phase-matching conditions near collinear degeneracy, where phase matching is noncritical for the signal beam in angle as well as in wavelength. The parametric amplification of a monochromatic image in LBO is also studied. Because their polarizations are identical, the signal and the idler can interfere, leading to phase-sensitive amplification.

© 1995 Optical Society of America

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