✦ LIBER ✦

Contents: Laser Phys. Lett. 8/2011

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 199 KB
Volume: 8
Category: Article
ISSN: 1612-2011
DOI: 10.1002/lapl.201190019

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✦ Synopsis

To design a "resonant diffraction" grating suitable for tuning the wavelength of a mid-IR laser, we selected quartz as substrate material, copper (Cu) as mirror material, thorium fluoride (ThF 4) as the material for the dielectric film, and germanium (Ge) for fabricating the corrugation on top of the latter. ThF 4 and Ge are cohesive materials with a high refractive index difference (n f = 1.50 for ThF4 versus nc = 4.07 for Ge) so that a high diffraction efficiency can be established with relatively shallow grooves. Furthermore, ThF 4 is transparent from the UV until the far infrared. (Cover picture:

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