Whats the deal about IR filtering ?
Without an IR filter, a DPSS laser could be putting out large amounts of Infra-Red. This is going to be at two different wavelengths 808nm (from the pump diode) and 1064nm (from the lasing crystal). Both of these wavelengths are basically invisible (although the 808nm is barely visible to the naked eye) and will not contribute to the brightness of your beam. Lasers without IR filters are often measured and the total output is quoted. Many lasers sold on eBay are filterless and have very high ratings. We have seen 150mw green lasers which only put out about 20-30mw of green. The rest is in IR. The IR does not focus the same way as the green because different wavelengths focus differently and in effect, you will end up with a cone of invisible radiation around the beam. If this invisible radiation reflects from a surface, it is possible to be getting a sustained hit in your eye which you will not notice. Most eBay lasers are of the unfiltered variety and if you are unlucky enough to have
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