| Optical and NLO Properties |
 |
| Optical transmission ( mm ) |
0.5 to 11.5 |
| Fundamental absorption edge ( mm ) |
0.47 |
| Energy gap (eV) |
2.64 |
Surface damage threshold
( t = 10 ns, l = 1.06 mm) - 50 MW/cm2 |
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Dispersion of refractive indices
(Experimental values) |
|
| l (mm) |
nx |
ny |
nz |
| 0.5 |
2.4377 |
2.5128 |
2.5125 |
| 0.6 |
2.3706 |
2.4355 |
2.4362 |
| 0.8 |
2.3151 |
2.3723 |
2.3733 |
| 1.064 |
2.2866 |
2.3411 |
2.3421 |
| 2.0 |
2.2599 |
2.3112 |
2.3144 |
| 4.0 |
2.2497 |
2.2985 |
2.3013 |
| 10.6 |
2.2139 |
2.2472 |
2.2448 |
| 11.5 |
2.2068 |
2.2369 |
2.2324 |
| Nonlinear optical coefficients ( pm/V ): |
|
d31 = ± 15;
d32 = ± 8.0;
d33 = ± 8.0.
X - c, Y - b, Z - a; At l = 1.064 mm
2V = 164.8o
dij defined in the abc frame (mm2 point
group, c - polar axis)
|
|
Dispersion of refractive indices ( Sellmeier equations, l in mm ) |
|
| n2x = 11.14357 - 0.16361483 / ( 0.06081829 - l2 ) - 24267.167 / ( 4000 - l2 ); |
|
| n2y = 11.94768 - 0.18261602 / ( 0.06821353 - l2 ) - 19915.432 / ( 3000 - l2 ); |
|
| n2z = 12.64467 - 0.17736979 / ( 0.07099873 - l2 ) - 21966.269 / ( 3000 - l2 ). |
|
Types of possible nonlinear processes in the principal planes
of the AgGaGeS4 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 = d32 cosq; |
|
oo - e, deff = d31 sinj |
ee - o, deff = d31 sin2q + d32 cos2q |
oe - e, eo - e, deff = 0 |
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Application |
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The AgGaGeS4 crystals can be used for frerquency doubling and
three-frequency mixing. Parametric oscillators and amplifiers based of AgGaGeS4 can generate
continuously tunable radiation in the spectral range from 1 to 11 mm
with suitable pump laser. |
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