Ferroelectric domain inversion has been demonstrated in BaMgF4. Transparenc
y has been measured to < 140 nm, and no change in transmission was measured
under 157-nm irradiation for >1.1 X 10(9) shots at 2 mJ/cm(2) per pulse. F
irst-order quasi-phase-matched generation of 157 nm is predicted by use of
grating periods as long as 1.5 mum. This material should permit shorter-wav
elength chi ((2)) frequency-mixing processes than with any other crystallin
e material. (C) 2001 Optical Society of America.