Laser Beam Profiling

See allHide authors and affiliations

Science  09 Jul 2004:
Vol. 305, Issue 5681, pp. 149-151
DOI: 10.1126/science.305.5681.149d

One factor that determines the quality of a laser beam is the intensity profile of the beam cross section. As solid-state lasers become smaller, laser beams become more tightly focused, and as the field generally moves toward nano-optics, the requirement to develop techniques to characterize such beams simply and effectively becomes increasingly urgent. Ditlbacher et al. use a stepped layer of gold to enhance the interaction between the light and the gold surface in order to excite surface plasmons in the vicinity of the step-edge. The surface plasmons then leak radiation into the underlying substrate at a specific angle. As the laser is scanned across the step-edge, a photodiode provides a relative measure of the intensity profile across the laser beam with submicrometer resolution. — ISO

Opt. Lett. 29, 1408 (2004).

Navigate This Article