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PROPERTIES of QUARTZ & SILICA
Optical
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Quartz and Silica wafers have exceptionally good transmittance
in the 170 to 2,500 nm. range.
Fused Silica, in general, exhibits the best transmission in the UV range.
The table below compiled from information received from the manufacturers of the material.
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Optical properties of
1.0 mm thick polished Quartz wafer
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@ Wave length
(nm) |
NATURAL QUARTZ |
SYNTHETIC FUSED SILICA |
Electric
Fused |
Flame
Fused |
Standard OH>1200ppm |
Semi Dry OH>800ppm |
Dry
OH>100ppm |
Very Dry
OH> 10ppm |
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Transmittance in %
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170
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57.00
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76.19
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91.04
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91.08 |
91.05 |
90.90 |
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210
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63.10
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80.80
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91.34
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91.38 |
91.35 |
91.20 |
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215
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69.50
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84.55
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91.47
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91.48 |
91.44 |
91.32 |
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240
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62.60
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89.41
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91.95
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91.95 |
91.79 |
91.79 |
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280
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91.50
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92.30
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92.41
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92.42 |
92.45 |
92.32 |
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500
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92.00
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93.14
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93.16
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93.17 |
93.17 |
93.17 |
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1000
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93.20
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93.39
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93.45
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93.44 |
93.45 |
93.45 |
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2500
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93.20
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93.86
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91.65
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93.91 |
93.90 |
93.91 |
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The numbers are the results of actual measurements and in some cases calculation and estimates.
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Refractive Index Table
(typical data) |
@ Wave length
in nm. |
NATURAL QUARTZ |
FUSED SILICA |
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Electric
Fused
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Flame
Fused
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237.8316
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-
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1.514923
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1.514791 |
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244.6895
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-
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1.510648
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1.510516
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246.4057
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-
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1.509648
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1.509516
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248.0000
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-
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1.508741
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1.508609
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257.6285
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-
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1.503708
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1.503583
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269.8828
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-
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1.498224
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1.498096
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289.3594
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-
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1.484668
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1.491039
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| 312.5668 |
- |
1.479943 |
1.484538 |
| 334.1476 |
- |
1.474707 |
1.479812 |
| 365.0153 |
- |
1.469789 |
1.474579 |
| 404.6563 |
- |
1.466898 |
1.469657 |
| 435.8327 |
- |
1.462971 |
1.466730 |
| 491.6068 |
- |
1.460247 |
1.462841 |
| 546.0734 |
- |
1.459014 |
1.460117 |
| 576.9598 |
- |
1.458563 |
1.458885 |
| 589.2900 |
- |
1.457461 |
1.458434 |
| 623.4402 |
- |
1.457185 |
1.457334 |
| 632.8164 |
- |
1.456135 |
1.457055 |
| 671.6428 |
- |
1.455668 |
1.456005 |
| 690.7520 |
- |
1.455291 |
1.455539 |
| 708.2010 |
- |
- |
1.455135 |
| 1060.0000 |
- |
- |
1.449700 |
| 2700.0000 |
- |
- |
1.425880 |
| 2900.0000 |
- |
- |
1.421560 |
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Refractive index to the air was measured at 25o C
Measurement accuracy is within o +/- 1 x 10-5
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