INTEGRATED OPTICS 2065 CONTACT ELECTRO- SnO2 LUMINESCENT ELECTRODE MAT ERIAL ELECTRODES (v n PUMP7 REFLECTOR (a) (b) Fig.4-Cross sections of possible lasers in plnnar waveguide:(a)external pump(b)pump ions imbedded in laser circuit. V.MODULATOR Figure 5 shows a possible phase modulator for a guided laser beam. The electrooptic material might be the substrate or might be applied as a thin surface layer adjacent to the guiding index region n2.Using photolithographic techniques,it should be possible to use spacing be- tween the metallic electrodes of about 25 um which would yield large modulating fields with only a few volts of modulator drive. MODULATING POTENTIAL METALLIC ELECTRODES --n -n2 LASER BEAM Fig.5-Phase modulator.INTEGRATED OPTICS 2065 SnO a ELECTRODE H'l' ,CONTACT l__ / ' ELECTRO￾I' / ^LUMINESCENT I « / MATERIAL PUMP REFLECTOR ^ELECTRODES \ 02 (a) ( b ) Fig. 4 — Cross sections of possible lasers in pinnar waveguide : (a) external pump (b) pump ions imbedded in laser circuit. V. MODULATOR Figure δ shows a possible phase modulator for a guided laser beam. The electrooptic material might be the substrate or might be applied as a thin surface layer adjacent to the guiding index region η^. Using photolithographic techniques, it should be possible to use spacing be￾tween the metallic electrodes of about 25 /im which would yield large modulating fields with only a few volts of modulator drive. Í MODULATING POTENTIAL METALLIC ELECTRODES SER EAM Fig. 5 — PhasR modulator