Day: November 9, 2026

In short Pointing stability is centroid movement over time. A camera profiler finds the beam centroid in every frame; the spread of those positions over a stated time is the stability. ISO 11670 reports it as twice the standard deviation, per axis. Angle needs a lens. At the focal plane of a lens, the spot […]

How far can a nonlinear crystal tilt before SHG or SPDC efficiency halves? Angular acceptance, walk-off and spectral acceptance for BBO and KDP, a worked 1064 nm example, and a calculator for crystal length, focusing and mount tilt resolution.