怎么利用TFCalc进行初始膜系设计？

龙飞

      请教各位大虾,比如：基底是纯YVO4，R<0.5%,@800--1300nm,  零度入射，请问怎么选择膜料？怎么进行初始设计？怎么优化膜系？
" Q/ F3 P) X5 K7 r8 {/ ]. }3 V' B   谢谢！

omfalio

高手请过来解释一下吧

YVO4折射率多少?

2 _& T; G( q) u% T8 g1 B1 l+ Y& t
Yttrium orthovanadate (YVO4) is a good birefringent single crystal with excellent physical and optical properties. Due to its wide transparency range, high transmittance, large birefringence and easily processed character, the material can be widely used in optical components such as fiber optical isolators and circulators, beam displacers and other polarizing optics, etc.
Main characteristics:
' r3 B$ m+ E  x5 {Transparency Range:
high transmittance from 0.4 to 5mm
Crystal Symmetry:
Zircon Tetragonal, space group D4h
5 C) V0 p. `: z8 z& f1 h1 TCrystal Cell:
a=b=7.12 Å; c=6.29 Å
Density:
5 Z8 A# @9 k/ g8 K8 R! r4.22 g/cm3
Mohs Hardness:
( n7 {. t4 @" r4 x1 n5, glass-like
Deliquescence
/ \1 B0 f0 x& ZNone
Thermal Expansion Coefficient:
aa = 4.43 x 10-6/K; a c = 11.37 x 10-6/K
Thermal Conductivity Coefficient :
5 a/ \( F0 f$ G+ [; Y//C: 5.23 W/m/K; ^ C: 5.10 W/m/K
Crystal Class:
4 {6 k* t* f( c2 P( vPositive uniaxial with no=na=nb, ne=nc
' }/ h- @& t( {7 j! Q* YThermal Optical Coefficient:
dna/dT = 8.5x10-6/K; dnc/dT = 3.0x10-6/K
Refractive Indices,
  u, }, y5 r2 h9 y1 Z& X8 CBirefringence (D n = ne- no) and
Walk-off Angle at 45o (r ):
3 ?8 H" o- g$ ]8 y! Jno = 1.9929, ne = 2.2154, D n = 0.2225, r = 6.04o at 0.63 m m
no = 1.9500, ne = 2.1554, D n = 0.2054, r = 5.72o at 1.30 m m
( S% }  M3 f/ Tno = 1.9447, ne = 2.1486, D n = 0.2039, r = 5.69o at 1.55 m m
Sellmeier Equation (l in m m):
no2 = 3.77834 + 0.069736/(l 2 - 0.04724) - 0.0108133 l 2
8 U2 X8 }; y. Gne2 = 4.59905 + 0.110534/(l 2- 0.04813) - 0.0122676l 2
Applications:
fiber optical isolators and circulators,
" ^: _4 v& I2 D' G3 }% wbeam displacers and other polarizing optics, etc.
Comparation with other Birefringent crystals
+ J9 u9 ]: b; I* ACompared to Calcite, YVO4 has better temperature stability and physical and mechnical properties. Calcite is hard to obtain high optical quality because of its low susceptibility to moisture and low hardness.
Compared to Rutile (TiO2) which exhibits too high hardness, YVO4 is easier to be handled for optical surface processing that greatly reduces cost of fabrication, especially for batch production.
# p* J6 a8 C9 \! XCompared to LiNbO3, although they have similar mechanical and physical properties, YVO4 has more than three times larger birefringence, that makes your design more compact.
. o3 w1 K- Y8 p* \* C% W

! W  G- m. b: s/ U/ n7 VTransparency Curve of YVO4
(Thickness=1mm)

初试膜系无所谓4H就可以了,利用needle方法,YVO4折射率选2.0,!H: TiO2 L:SIO2

guo253918332

还不错,试了一锅还可以.