| Optical and NLO Properties |
 |
| Optical transmission ( mm ) |
0.594 to 16.45 |
| Fundamental absorption edge ( mm ) |
0.56 |
| Energy gap (eV) |
2.2 |
Surface damage threshold
( t = 10 ns, l = 1.06 mm) - 50 MW/cm2 |
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Dispersion of refractive indices
(Experimental values) |
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| l (mm) |
nx |
ny |
nz |
| 1.064 |
2.4215 |
2.5683 |
2.5803 |
| Nonlinear optical coefficients ( pm/V ): |
|
d31 = ± 28;
d32 = ± 14.6;
d33 = ± 14.6.
X - c, Y - a, Z - b; At l = 1.064 mm
2V = 149.5o
dij defined in the abc frame (mm2 point
group, c - polar axis)
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Dispersion of refractive indices ( Sellmeier equations, l in mm ) |
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| n2x = 5.7182737 - 24.729565 / ( 250.0 - l2 ) - 0.24365570 / ( 0.12550405 - l2 ); |
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| n2y = 6.5626531 - 116.75498 / ( 400.0 - l2 ) - 0.32805600 / ( 0.12928073 - l2 ); |
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| n2z = 6.6688973 - 136.03294 / ( 400.0 - l2 ) - 0.33109498 / ( 0.12679454 - l2 ). |
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Types of possible nonlinear processes in the principal planes
of the AgGaGe5Se12 and effective nonlinearity deff |
|
| XY plane |
YZ plane |
XZ plane q < V |
|
oe - e, eo - e, deff = 0 |
oe - o, eo - o, deff = 0 |
oo - e, deff = d31 cosq; |
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oo - e, deff = d32 sinj |
ee - o, deff = d32 sin2q + d31 cos2q |
oe - e, eo - e, deff = 0 |
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Application |
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The AgGaGe5Se12 crystals can be used for frerquency doubling and
three-frequency mixing. Parametric oscillators and amplifiers based of AgGaGe5Se12 can generate
continuously tunable radiation in the spectral range from 1.2 to 15.6 mm
with suitable pump laser. |
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