Four kinds of currently available Nd:hosted laser passive Q-switch and mode
-locking modulators: plastic dye sheet, LiF:F-2(-) color center crystal, Cr
+4:YAG crystal and RG1000 colored glass filter were investigated in detail
and summarized for comparison for the first time. The LiF:F-2(-) crystal wi
th outstanding annealability, long lifetime, low cost and operability at hi
gh repetition rates is highly recommended. (C) 2000 Elsevier Science Ltd. A
ll rights reserved.