Table 2.

Calculated geometry function ${\mathrm{G}}_{\mathrm{L}}\left(r,\mathit{\theta }\right)$. The length of an active ytterbium core was taken as 3.5 mm for the line‐source approximation

Polar angle θ(deg.)	r (cm)
	0.5	1	2	3	4	5	6	7	8	9	10
0	4.558	1.032	0.252	0.111	0.063	0.040	0.028	0.020	0.016	0.012	0.010
10	4.530	1.030	0.252	0.111	0.063	0.040	0.028	0.020	0.016	0.012	0.010
20	4.450	1.026	0.252	0.111	0.063	0.040	0.028	0.020	0.016	0.012	0.010
30	4.337	1.021	0.251	0.111	0.063	0.040	0.028	0.020	0.016	0.012	0.010
40	4.212	1.014	0.251	0.111	0.063	0.040	0.028	0.020	0.016	0.012	0.010
50	4.092	1.006	0.250	0.111	0.063	0.040	0.028	0.020	0.016	0.012	0.010
60	3.989	1.000	0.250	0.111	0.062	0.040	0.028	0.020	0.016	0.012	0.010
70	3.912	0.995	0.250	0.111	0.062	0.040	0.028	0.020	0.016	0.012	0.010
80	3.864	0.991	0.249	0.111	0.062	0.040	0.028	0.020	0.016	0.012	0.010
90	3.848	0.990	0.249	0.111	0.062	0.040	0.028	0.020	0.016	0.012	0.010