The study of the Cr4+ : Y2SiO5 crystal coupling coefficients as a solidqswitch for the chromic solid-state lasers

Abstract EN

The passively Q-switching method has been used for the chromic solid-state lasers such as (Ruby, Alexandrite, Cr : LiCAF, Cr : LiSAF) lasers with Cr4+ : Y2SiO5 solid-state crystal.

We have studied the saturable absorber crystal properties which are used in passive Q-switching all these lasers.

The molar extinction coefficient (ε), coupling coefficient of the saturable absorber (Ka), the optical density (d), the ground-state absorption cross-section (σa) of Cr 4+ : Y2SiO5, and the Q-switching efficiency (η) of the chromic solid-state lasers is calculated first, when the pumping rate (Rp) was variable and other parameters (as reflectivity of output coupler (R) and the number of molecules in the ground-state (Na) were constant) and second, (η) is calculated when (R) was variable and other parameters were constant.

The results of Cr 4+ : Y2SiO5 crystal which is used with all these lasers are compared each others, and the behavior of (ε), and (Ka) had been interpreted according to (σ), and (d), respectively.

The Cr 4+ : Y2SiO5 Q-Switched Cr : LiSAF laser has a better passive Q-Switching performance than other used laser systems .

The main conclusion in this research is that the molecular weight of the chromic ion host laser crystal acts as an important role in Q-Switching efficiency where it is directly proportional with the Q-switching efficiency.