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Monocrystals of TlCl - TlBr and TlBr - TlJ solid solutions of flexible composition

 

 

 

Application:
Optical elements having variable radial refractivity gradient for IR radiation focusing and collimating. Billets for graded index polycrystalline IR fiber production.

  

Optical properties:

 

Spectral transmission band, mcm 0,4 - 50
Spectral transmission coefficient,%  
at wave length of 0,63 mcm 55 - 65
in wave length range of 2,5 - 25 mcm 68 - 70
Coefficient of laser emission volumetric absorption at wave length of 5-6 and 10,6 mcm, cm-1 5·10-4
Gradient element size,mm  
diameter 1,5 - 5,0
length ( ? = 0,63 , L = 1/4 ) 10 - 15
Focal spot diameter, mcm 10 - 12
Numerical aperture, NA = sin Ø  0,4 - 0,6
Maximum refractive index difference, À n 0,08 - 0,09
Radial distribution of refractive index close to parabolic
Sizes of graded index billets for optical fibers  
diameter, mm 1 - 15
length, mm 30 - 80

 

Diagram of ray propagation in “grin” 1/4 L long
gradan.jpg

 

TlBr-TlCl (1) and TlBr-TlJ (2) gradient monocrystal transmission spectrum
spectr-gradan(1).jpg