[转帖]Broadband AR for a Cone of Light

xx_912

<P>Broadband AR for a Cone of Light</P>
. }/ s+ |! p4 W7 W4 `<P>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
<P><BR>R &lt; 0.5% for wavelengths 420, 425, 430,..., 680 and for a 40-degree cone
) T) C6 B" B3 Y; [& N, C<P><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.
<P>
- h! \) t- t5 Q% L6 `% C3 S" O<P align=center> </P>
- ]% ~5 O; R3 V) T$ G  d<P>Here is the design, starting with the layer closest to glass, and with thicknesses given in nm: </P>
' Y8 W: M7 i$ L) J3 K9 T<P><PRE>TIO2          11.04
SIO2          44.43
TIO2          34.99
SIO2          28.25
TIO2          30.46
SIO2         104.92
) q4 }, e/ r4 T3 ?4 s. ]5 q</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!