\begin{pspicture}[showgrid](0,-0.3)(3,3.3)
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\pnode(0,2.5){A}
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\pnode(2,2.5){B}
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\pnode(2,1.5){C}
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\mirror[labelangle=-45](A)(B)(C){M}
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\optbox[position=start,labeloffset=0,labelref=relative](C)(B){Laser 1064 nm}
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\drawbeam(A){1}{2}
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\end{pspicture}
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