Paratellurite crystal physical properties

Crystal symmetry: 422

Density: 5,984 g/cm^3

Optical spectral range: 0,35 - 5 mkm

Elastic constants : 10^11 dyn/cm^2 or 10^10 Pa)

5.57	5.114	2.18	0	0	0
5.114	5.57	2.18	0	0	0
2.18	2.18	10.58	0	0	0
0	0	0	2.65	0	0
0	0	0	0	2.65	0
0	0	0	0	0	6.59

Photolastic constants :

0.0074	0.187	0.34	0	0	0
0.187	0.0074	0.34	0	0	0
0.0905	0.0905	0.24	0	0	0
0	0	0	-0.17	0	0
0	0	0	0	-0.17	0
0	0	0	0	0	-0.0463

Refraction indices:

Paratellurite refraction indices for arbitrary light wavelength could be calculated with the following equation:

The values of coefficients C for ordinary and extraordinary optical waves are presented in the following table:

Refraction index	C0	C1	C2	C3
	3.71789	0.07544	0.19619	4.61196
	4.33449	0.14739	0.20242	4.93667

The values for refraction coefficients for the given optical wavelengths.

wavelength, mkm
0.4047	2.4206	2.6038
0.4358	2.3795	2.5545
0.4678	2.3475	2.5163
0.48	2.3373	2.5041
0.5086	2.3167	2.4797
0.5461	2.2952	2.4542
0.5895	2.2759	2.4314
0.6328	2.2609	2.4137
0.6438	2.2577	2.4099
0.69	2.2457	2.3958
0.8	2.2256	2.3721
1	2.2052	2.3481
1.15	2.1964	2.3377
1.55	2.1838	2.3224
2	2.1764	2.3131
3	2.1630	2.2952
3.39	2.1545	2.2844
4	2.1208	2.2503
5	2.087	2.213

Sound velocity:

direction	polarization	v (10^5 cm/s)
[100]	[100], L	3.051
[100]	[010], S	3.317
[100]	[001], S	2.1
[001]	[001], L	4.202
[001]	arb, S	2.104
[110]	[110], L	4.663
[110]	[1-10], S	0.616
[110]	[001], S	2.1
[101]	[-101], S	2.101

Paratellurite slowness surfaces in important planes

Acousto-optic figure of merit:

sound dir.	sound pol.	light dir.	light pol.	M (10^-18 s^3/g)
[100]	[100], L	[010]	[100]	0.048
[100]	[100], L	[010]	[001]	10.6
[001]	[001], L	[010]	[100]	34.5
[001]	[001], L	[010]	[001]	25.6
[101]	[-101]	[010]	[100]	77.7
[110]	[1-10], S	[001]	circ.	1200