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Laser diode collimator 3 element glass lens ar coated
Here is a very nice laser diode collimator lens assembly. This is an all glass, 3 element unit which is antireflective (AR) coated for excellent throughput. This is AR coated for visible light, but in testing here it still works better than an uncoated lens for 808nm lasers. The coatings are not suitable for blue or violet light (i.e. 405nm blu-ray laser diodes).
Here is the best part. This will fit perfectly in the Aixiz 12 x 30mm laser diode module which is popular for use with high power red laser diodes. Just the thing you need for maximum burning power and a nice clean beam since the high power diodes can actually melt the standard plastic lens!
Similar laser diode collimator / focuser lenses from Melles Griot, Thorlabs or Newport can cost >$200 each! Here's a chance to pick one up at a hobbyist price.
Here is our lens on the left compared to the stock plastic lens in the Aixiz diode module. These are much nicer than the plastic lenses usually found in inexpensive laser diode modules (as shown on the right).
Here is an Aixiz 5mw 650nm laser diode module with the stock collimator.
and the same module with an upgraded collimator producing 10% more power (less loss in the collimator)
Glass lenses produce a higher quality beam as shown on the left compared to a plastic collimator on the right.
You can easily tell that these are AR coated by the slightly violet color reflected from the lenses
Cheap lenses are not AR coated and so they do not let as much light through.
* Effective Focal Length: 8mm
* Back Focal Length: 1.5mm (distance from diode emitter to lens)
* Material: black anodized aluminum
