펨토초 레이저에 의한 크롬박막 미세 회절패턴 제작

Diffractive patterning on Cr thin film using femtosecond laser pulses

  In this paper, we suggested the femtosecond laser processing using the mask which makes Gaussian spatial beam distribution to a normalized distribution by Fresenel diffraction. Holography pattern of the size of 320 × 320 ㎛² on the Cr thin film on glass substrate with a pixel size of 5 × 5 ㎛² was fabricated according to the pattern generated by the iterative Fourier transform algorithm (IFTA) algorithm. We analysed the damage threshold with an assumption the power distribution as Gaussian profile as 45 mJ/㎠, The regenerated image of letters through the diffractive pattern was well recognized at the screen.