Quantitative OCT analysis BegoStone and COM stone craters after LL treatment with the perpendicular fiber in contact with the stone surface (0.8 J and 10 Hz) in water (e) and in air (d–f) for 3 laser pulse modes from 1 to 100 pulses. Crater volume (e, d), depth (b, e), and surface profile area (c, f) are plotted on equivalent y-axis scales across treatment in water and air for comparison along with the logarithmic fits (dotted lines). OCT = optical coherence tomography.