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Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
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Posts: 1155
There are some rather interesting anecdotal opinions on ZnSe collimation and focus lenses for CO2 cutter heads.
I was curious if anyone has ever successfully tried to use something else (like KBr) for a lens in over 50W/CM^2 power 800-1160nm range. i.e. how long can one expect it to survive compared to ZnSe parts.
Registered Member #2372
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The wavelength range you are interested in is basically visible so regular glass optics will work, ZnSn is usually for wavelengths around 10um, it doest really transmit below 2um. Also, that power level seems pretty low, pulsed laser systems are easily over 1 GW/cm^2 in intensity and they use glass lenses all the time for that wavelength range.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
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The Fused Silica popped at that range, but perhaps it was contaminants.
Note untreated (no AR coat) ZnSe can easily pass 0.7um to 12um, and is indeed usually less efficient.
Thanks though, I will likely try another Silica lens or an Off-axis parabolic mirror since they are relatively inexpensive and more efficient. Although, I'm not really too concerned about small chromatic aberrations given you are correct in pointing out that the mentioned value is an unfocused CW output.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
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When you say it popped, what do you mean? Did the coating get damaged or the optic itself crack?
The most likely cause was contamination on the lens, a fingerprint or even some smoke on an optic will quickly destroy it when exposed to high power densities.
The ZnSe would probably be fine, but as was noted normal BK7 would be just as good if not better. Silica is actually inferior to BK7 as long wavelenghts, but at 1100nm it should be ok as long as the AR still works at that wavelength.
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IR Laser ZnSe vs KBr optics
