Advances in Optical and Photonic Devices by Ki Young Kim

By Ki Young Kim

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Each section can be described as a separated cavity and the total reflection and transmission is then found. The back section amplitude reflection from the left side and right side is described from the SMM as rbl = r1 + ( t1r2 ( −t1 ) exp −2iβb Lb ( ) 1 − r2 ( − r1 ) exp −2iβb Lb (1) ) and rbr = −r2 + ( t2 ( −r1 )( −t2 ) exp −2iβb Lb ( 1 − r2 ( −r1 ) exp −2iβb Lb ) ) (2) respectively where β is the complex propagation constant ( β = βre + iβim) and Lb is the back section cavity length. The back section amplitude transmission from the left side is described as tbl = ( t1t2 exp −iβb Lb ( ) 1 − r2 ( −r1 ) exp −2iβb Lb (3) ) and tbr = tbl giving a power reflection and transmission is Rbl = (rbl)2 and Tbr = (tbr)2 respectively.

18(a) represents a PQR emission pattern observed from a device of a 48um diameter which is rather close to the Lambertian emission pattern of a conventional LED. 3 degree as shown in Fig. 18(b). This analysis results from the 3D scans made at 30, 60 and 90 um heights respectively as shown in Figs. 18(c),(d) and (e), where divergence points are determined as half maximum intensity points. We find from the 3D scans that the initial beam profile of Laguerre Gaussian is evolving to Gaussian as a function of scan height.

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