| 摘要 |
A method of depositing an optical coating with a predetermined refractive index n and a thickness d, using a first source material having a refractive index nH greater than n and a known rate of deposition rH and a second source material having a refractive index nL less than n and a variable rate of deposition rL, requires calculating the deposition rate rL according to the equation <IMAGE> and depositing the first source material at the rate rH and the second source material at the rate rL for a time interval T=d/(rH+rL). A method of depositing a gradient index optical coating with a predetermined refractive index profile n(d) which is a function of depth d in the coating uses a first source material having a refractive index nH and a known rate of deposition rH and a second source material having a refractive index nL and a variable rate of deposition rL. The method includes the steps of setting the initial depth d to 0, then calculating the deposition rate rL(d) for the depth d according to the equation. <IMAGE> The first source material is then deposited at the rate rH and the second source material at the rate rL(d) for a time interval DELTA t. At the end of the time interval, the depth d is updated by adding an amount DELTA d=(rH+rL(d)) DELTA t. The steps of calculating, depositing, and updating are repeated until the predetermined refractive index profile is achieved.
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