[转帖]Broadband AR for a Cone of Light

xx_912

<>Broadband AR for a Cone of Light</P>
/ D& q8 }! j6 n6 z/ Q7 z<>Here we consider a coating on glass that reflects only 0.5% of a cone of light for a range of wavelengths from 420 to 680 nm. The cone axis is normal to the glass. The cone has an F-number of 0.778, which means the half-angle is 40 degrees. An uncoated glass surface reflects 4.4% of this cone of light. We use a feature new to version 3.5: cone-angle targets. As optimization targets we use
, S& G. |) y. A) P4 t<><BR>R &lt; 0.5% for wavelengths 420, 425, 430,..., 680 and for a 40-degree cone
3 O' v6 V4 q- q- _* w<><BR>In TFCalc, these targets are easy to enter by using the "Generate Cone Targets" command on the Options menu of the "Targets - Cone Angle" window. We use TFCalc's needle/tunneling optimization to design the coating from "scratch". That is, we begin the design process with a single thin layer of TiO2 and allow TFCalc to increase the thickness and number of layers in the design. TFCalc finds a 6-layer design in a few minutes. The performance of this design is shown below. The little circles indicate the optimization targets.
. g  e5 W1 G% Q$ ^<>
< align=center> </P>
<>Here is the design, starting with the layer closest to glass, and with thicknesses given in nm: </P>
) X2 O- Q1 s6 k2 n5 `<><RE>TIO2          11.04
SIO2          44.43
% w" o4 ]8 O) L3 W+ \7 pTIO2          34.99
6 p, r( A( f/ O! A' S) D; SSIO2          28.25
TIO2          30.46
SIO2         104.92
# k1 w( \3 ]4 ]6 I* {</PRE>

xx_912

<IMG src=\"http://www.sspectra.com/designs/coneAR.gif\">

xiaoxi

Ta2O5和MgF2不能达到!

coolcarry

搂住的水平很厉害！

coolcarry

我们一般也就是这样的结果

rotarynife

版主,非常感谢!