An optical needle optical field modulation device is suitable for using light to cure a to-be-treated area, comprising a coherent light source, a columnar light transmission member, and a light adjustment member. The light transmission member comprises a light incident surface and a light exiting surface, and a circumference extending from the periphery of the incident surface toward the light-emitting surface. The light adjustment member is adjacent to any one of the three components of the light transmission member: namely the light incident surface, the light exiting surface and the circumference, and has several micro-structures with optical diffraction property. The coherent light source emits light beam passing through the light incident surface of the light transmission member toward the light exiting surface, and the energy distribution of the light beam can be altered after passing through the micro-structures of the light adjustment member before emitting. The coordination of the aforesaid components can generate light diffraction to achieve shaping effect and uniformity of the light beam.一種光針光場調變裝置,適用於利用光來對一待治療部位進行治療,並包含:一同調光源、一柱狀的光傳導件,及一光調整件。該光傳導件包括一入光面、一出光面,以及一自該入光面周緣朝該出光面延伸連接的圍面。該光調整件鄰近該光傳導件的該入光面、該出光面與該圍面三者中的其中一面,並具有數個具光學繞射性質之微結構。該同調光源的光線可經由該光傳導件的入光面往該出光面方向射出,且光線通過該光調整件的該等微結構後可被改變能量分布後再射出。藉由上述元件之配合,可產生光繞射作用,達到光束整型效果,並使光線均勻。1‧‧‧同調光源2‧‧‧光傳導件21‧‧‧入光面23‧‧‧圍面3‧‧‧光調整件30‧‧‧微結構31‧‧‧第一面34‧‧‧結合套管35‧‧‧光調整本體36‧‧‧O型環L‧‧‧中心軸H‧‧‧微結構的高度
