Figure 2 : Comparison of the digital laser to an equivalent plano-concave laser.

From: A digital laser for on-demand laser modes

Figure 2

(a) Schematic of the stable plano-concave resonator with a waist plane at the flat OC. (b) Measured intensity profiles for two curvature cases (R=400 and 500 mm), comparing the digital laser output (SLM) with that of physical mirrors (Mirror). (c) The change in measured beam size with digitally imposed curvature matches the theoretical curve. (d) The threshold of the digital laser is higher than that of the conventional laser owing to the additional losses from the SLM shown here for the R=400 mm case. The black lines are fits to the data and error bars are s.d..