Beam Expander gets hot

[rob1728]

I just installed a 2x beam expander rated for my 150 watt reci laser. After aligning the lens and running some test I cut some thin plastic. The mount and the lens got hot. What do I do. Here is a picture of my setup. The small diameter is input and the larger diameter is output. Thanks for your help. Rob

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[rob1728]

I ran the cut at 70% power and 28ma.

[rob1728]

There is about a .5 inch space from the laser output to the input of the beam expander

[Tech_Marco]

You need at lease 1" space, probably 1.5" is better for the heat to release from the tube. It is too closed to the laser tube.

Marco