Title :
Phase tuning by laser ablation of LiNbO/sub 3/ interferometric modulators to optimum linearity
Author :
Bulmer, C.H. ; Burns, W.K. ; Greenblatt, A.S.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
fDate :
6/1/1991 12:00:00 AM
Abstract :
Fast, accurate phase bias trimming of LiNbO/sub 3/ interferometric modulators by excimer laser ablation is reported. Phase angle measurements and correction were performed in situ on a previously fabricated, packaged modulator. Any angle can be precisely adjusted to 90 degrees (maximum linearity). Single-laser-pulse exposures on one interferometer arm caused changes in angle of 0.8-8 degrees , depending on laser fluence and the depth of the material removed.<>
Keywords :
laser beam effects; light interferometers; lithium compounds; optical modulation; LiNbO/sub 3/ interferometric modulators; Mach-Zehnder interferometer; depth; excimer laser ablation; fabricated packaged modulator; interferometer arm; laser fluence; phase angle measurements; phase bias trimming; phase tuning; single laser pulse exposures; Goniometers; Laser ablation; Laser transitions; Laser tuning; Linearity; Optical materials; Packaging; Performance evaluation; Phase measurement; Phase modulation;
Journal_Title :
Photonics Technology Letters, IEEE
