Table 1. ZEMAX simulation [20].

Distance (fiber to GRIN, mm)	Spot size (µm)	Working distance (mm)	FOV (mm)
0.05	55.9	12.9	8.4
0.1	43.2	10.4	6.8
0.2	29.4	7.4	5
0.3	22.4	5.7	3.8
0.4	18.4	4.6	3.2
0.5	16.1	3.9	2.6
0.6	14.7	3.3	2.4
0.7	14.1	2.9	2
0.8	13.8	2.6	1.8