Optical Second Harmonic Generation Microscopy as a Tool of Material Diagnosis

Table 2

Possible directions of 𝑃_𝑠 in monoclinic 𝑃𝑚 system. Here 𝑝₁>𝑝₃>0 [20].

Type 1	±𝐏1=(±𝑝1,0,±𝑝3)	±𝐏2=(±𝑝3,0,±𝑝1)
	±𝐏3=(±𝑝3,0,∓𝑝1)	±𝐏4=(∓𝑝1,0,±𝑝3)
Type 2	±𝐏5=(±𝑝1,∓𝑝3,0)	±𝐏6=(±𝑝3,∓𝑝1,0)
	±𝐏7=(±𝑝3,±𝑝1,0)	±𝐏8=(±𝑝1,±𝑝3,0)
Type 3	±𝐏9=(0,±𝑝3,∓𝑝1)	±𝐏10=(0,∓𝑝3,∓𝑝1)
	±𝐏11=(0,±𝑝1,±𝑝3)	±𝐏12=(0,∓𝑝1,±𝑝3)