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

TlBr-TlCl (1) and TlBr-TlJ (2) gradient monocrystal transmission spectrum
