New view on optical quality of Cr4+:Mg2SiO4 laser crystals: analysis of absorption spectra

Nowadays chromium-doped forsterite single crystals (Cr
⁴⁺
:Mg
2
SiO
4
) are one of the key elements of high power femtocecond lasers. Besides that on the base of two forsterite crystals Cr
³⁺
:Mg
2
SiO
4
and Cr
⁴⁺
:Mg
2
SiO
4
[1] and the same pump laser (on Al
2
O
3
:Ti
³⁺
crystal) a CW laser device with the tuning of the generation wavelength in the wide range from 1095 to 1325 nm can be developed.