Lasertarget
Standard or Raman ultra-low fluorescence
- Type Ia
- Type IIas
- (100)-oriented
Description
Example of dimensions | Type Ia (100)-oriented |
X (diameter) | 1.50 mm |
T (table) | 1.10 mm |
C (culet) | 0.90 |
Htc (total height) | 0.35+0.00+0.21 mm |
Almax easyLab is committed to its policy of continuous improvement. Specifications may change without notice. easyLab and Diacell are registered trademarks of Almax easyLab.
Material
Diamond Type Ia | ~2×10³ ppm of nitrogen – yellow |
Diamond Type IIas – Raman ultra-low fluorescence & ultra-low birefringence | ~1 ppm of nitrogen – white |
Almax easyLab is committed to its policy of continuous improvement. Specifications may change without notice. easyLab and Diacell are registered trademarks of Almax easyLab.
FT-IR Spectrum
FLUORESCENCE
Almax easyLab can select its diamonds for low fluorescence. Standard measurements include laser excitation at 532 nm and covers fluorescence background in the range of 542 to 608 nm (Raman shifts between 1000 and 3000 cm-1). Measurements for different wavelength ranges can be made available on request. In special cases customers can select their own diamonds for low fluorescence using their own measurement set-up.
Almax easyLab classifies its diamonds with respect to fluorescence according to the following criteria:
- Type Ia UV low fluorescence – Checked with a UV lamp
- Type IIas Raman ultra-low fluorescence – The intensity of the two-phonon Raman transition at 2664 cm-1 is at least 5 times the intensity of the background fluorescence of diamond
BIREFRINGENCE
All diamonds to be used for anvil manufacture are examined under a polarising microscope for birefringence. Diamonds with significant birefringence discontinuity, typical of inclusions, etc. are rejected. In addition diamonds can be selected for ultralow birefringence. Total birefringence is measured using crossed polarisers, a waveplate and matched to specifications. Normally:
- Low birefringence <0.0001
- Ultra low birefringence <0.00005
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