The fourth-harmonic generation of broadband 243-nm radiation is reported. The broadband radiation is achieved by implementation of a multicrystal design to overcome spectral bandwidth limitations, and a plane-wave analysis is developed that shows increased spectral bandwidths for these designs. The fourth harmonic of a Cr:LiSAF laser operating at 972 nm is generated in beta-barium borate (BBO). The results demonstrate a spectral bandwidth at 243 nm more than five times broader than that which is expected from a single BBO crystal of equivalent length.
© 1998 Optical Society of America
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4360) Nonlinear optics : Nonlinear optics, devices
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
Margaret Brown, "Increased spectral bandwidths in nonlinear conversion processes by use of multicrystal designs," Opt. Lett. 23, 1591-1593 (1998)