Table 1.

Experimental parameters.

λ (nm)	PRF (Hz)	t (s)	TBscan (s)	Tmax (s)	α (mrad)
570 and 578*	600**	7×10−9	2.7**	7200**	200***

λ: wavelength; PRF: pulse repetition frequency; t: duration of a single pulse; T_Bscan: exposure duration of each B-scan; T_max: duration of a complete exposure; α: angular subtense.

^*Because 570 and 578 nm are close to each other and show minimal differences in terms of the safety limits, we use 570 nm throughout the calculation.

^**In the experiments shown in Figs. 2a and 3, the imaged region of interest is 4 mm by 4 mm, with a scanning step size of 2.5 μm. Unidirectional cross-sectional scanning (B-scan) is utilized to avoid the effect due to the backlash of the mechanical scanner. Each forward B-scan takes ~2.7 s, and the scanner reposition takes another ~1.8 s. The total image acquisition time is ~2 hr (7200 s), which is limited by the mechanical scanning speed.

^***The angular subtense is estimated by the numerical aperture of the microscope objective, which is 0.1 in our current system.