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Waveguide Substrate

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As shown in the following Table, several crystals can be used as waveguide substrates for integrated optics applications. For electro-optic waveguide applications, the mostly used inorganic substrate is LiNbO3 crystal. CASIX supplies high quality LiNbO₃ and MgO:LiNbO₃ substrates with the specifications listed below at very competitive prices.

Materials	r (pm/V)	n	e_eff (e₁₁e₃₃)^1/2	n³r/e_eff (pm/V)
KTP	35	1.86	13	17.3
LiNbO₃	29	2.2	37	8.3
KNbO₃	25	2.17	30	9.2
BNN	56	2.22	86	7.1
SBN	56-1340	2.22	119-3400	5.1-0.14
GaAs	1.2	3.6	14	4
BaTiO₃	28	2.36	373	1

KTP Waveguide Substrate
As compared in the above Table, KTP is an excellent crystal for electro-optic waveguide applications. Moreover, because of its low optical absorption and high damage threshold, the new low optical loss waveguides developed with KTP have created novel applications of integrated optics.

Dimensions: 1. Z-cut, 5 x 5 x 1, 10 x 10 x 1, 15 x 15 x 1 or 20 x 20 x 1 mm³
2. Other size is available upon request.

Finish:
One surface is polished to better than l/4 (while mounted) and free from surface defects when observed by a 50x microscope, and the other face fine ground.

LiNbO₃ Waveguide Substrate

Dimensions: 1. X-cut, Y-cut, or Z-cut, 50 x 50 x 1 mm.
2. Y-cut or Z-cut, f3" x 1 mm.
3. Other size is available upon request.

Finish:
One surface is polished to better than l/2 (while mounted) and free from surface defects when observed by a 50x microscope, and the other face fine ground.

Tolerance of orientation: < 10'

MgO:LiNbO3 waveguide substrate

Dimensions: 1. Z-cut, 25 x 25 x 1 mm or f40 x 1 mm
2. Other size is available upon request.

Finish:
One surface is polished to better than l/2 (while mounted) and free from surface defects when observed by a 50x microscope, and the other face fine ground.

Tolerance of orientation: < 10'