SPI Quartz Microscope Slides and Cover Slips
Transmittance data for SPI supplied quartz slides and cover slips
SPI Supplies offers a full range of quartz microscope slides and cover slips
and we believe that full technical data should be made available about SPI Supplies products.
When such data is not on our website, we invite any customer to
contact us and we will do our best to get the information that is required
and what goes beyond what is presently being provided on the website.
In the case of quartz, not all quartz is the same, and if you are interested
in doing only the highest quality research, then surely you would want to
know something about the transmittance data for the quartz you are
contemplating using.
Near-Infrared: (0.7-1) to 5 µm
Mid-Infrared: 5 to (25-40) µm
Far-Infrared: (25-40) to (200-350) µm
The quartz used in the SPI offered quartz slides and cover slips
is what is denoted as "124" in the above given data. In the all important range of 0.290 to 2.5
micrometers, the transmittance is well over 90%, perhaps on the order of 93-94%.
For various reasons, it is not possible to make easily slides and cover slips out of Quartz 214 or 219.
They are listed here for comparison purposes only. If you require higher transmission in the near infrared
range, think about using our two sided polished MgO.
One more note:
For those who might be a bit confused, all of the quartz used in the slides
and cover slips, as standard products of SPI Supplies are of amorphous quartz,
sometimes also referred to (in different parts of the world) as "fused quartz".
However, there is indeed another form of quartz, it is crystalline (alpha) quartz.
In some respects it has properties that are even better than Quartz 124 amorphous
quartz. However, being highly crystalline, it does exhibit an optical anisotropy,
it does exhibit birefringence (it will rotate light) and therefore, in general,
it would seem to not be the recommended type of quartz as slides or cover slips.
The main uses of quartz in crystalline form are as Brewster windows, 1/4 wave plates,
and polarizing prisms. We are able to provide quartz in crystalline form, we caution
that it is much more expensive than the amorphous form, but should you see potential
applications, let us know your requirements
and we can offer pricing.
If you should
have further questions about the quality or other specifications of the
quartz slides and cover slips offered by SPI, do let us know.
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Saturday July 04, 2009
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