[转帖]Broadband AR for a Cone of Light

xx_912

<>Broadband AR for a Cone of Light</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
! R! W( N8 V3 b$ n2 c<><BR>R &lt; 0.5% for wavelengths 420, 425, 430,..., 680 and for a 40-degree cone
( R1 @5 u0 N. s# _. _9 K% a. v$ r% z<><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.
; C( h! _$ ], G; z; s; G<>
< align=center> </P>
<>Here is the design, starting with the layer closest to glass, and with thicknesses given in nm: </P>
8 ]) m6 E. g* T: `2 x; R- D) n<><RE>TIO2          11.04
' j1 _9 G4 Q: z9 u8 p9 w  D! r" V/ tSIO2          44.43
- B8 y! e/ u5 bTIO2          34.99
SIO2          28.25
TIO2          30.46
: ~) F& E  ^2 C. ~SIO2         104.92
4 d' ^: C1 j+ ?6 G4 v$ V% H</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!