Figure 3
SRG inscription as captured by the DHM. In (a–d) 2D height maps of a \(4\ \upmu \hbox {m}\) period grating written utilizing left- and right-handed circular polarizations for the writing beams. The red scale bars in the figures correspond to a \(10\ \upmu \hbox {m}\) distance. The 2D height maps are captured at a 200 fps frame rate, with single measurements at 0.0 s, 0.5 s, 1.0 s, and 3.0 s after opening the shutter for the writing beams shown in (a–d), respectively. In (e) the grating heights are shown for L/R and S/S polarizations for the writing beams with \(2\ \hbox {W}/\hbox {cm}^2\) average intensity, showing fast SRG inscription for the L/R polarization, but only minor surface deformation for the S/S polarization combination, as expected.
