Numerical simulation of dye-doped sol-gel Q-switch for ruby laser

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					Numerical simulation of dye-doped sol-gel Q switch for ruby laser
Yung-Cheng Changa(張永政), Yu-Hua Wub(吳育驊), and Yen-Kuang Kuoa(郭艷光)
a
    Department of Physics, National Changhua University of Education, Changhua, Taiwan, R.O.C.
b
    Institute of Photonics, National Changhua University of Education, Changhua, Taiwan, R.O.C.


Organically-doped sol-gel materials have been extensively developed in the past few years.
Incorporating stable dyes into glasses prepared by sol-gel process enables the design of solid-state dye
lasers which have advantages over liquid dye laser for not being volatile, flammable, and mechanically
unstable. The sol-gel process is a solution synthesis technique with which the solid-state transparent
matrices with a low temperature chemical route are prepared. In a prior work (Y.-K. Kuo et al., Elec.
Lett. 32, 21462148, 1996), the tricarbocyanine dye HITCI was incorporated into the inorganic-organic
hybrid polymers, organically modified silicate (ORMOSIL), and used effectively as a solid-state
saturable absorber Q switch for the Cr3+:LiCaAlF6 (Cr:LiCAF), Cr3+:BeAl2O4 (alexandrite), and
Cr3+:Al2O3 (ruby) lasers. In this work, the optical properties of the passive Q-switching of ruby laser at
694.3 nm with the HITCI-doped-ORMOSIL sol-gel saturable absorber Q switch are studied
numerically by solving the coupled rate equations with the Runge-Kutta method. Simulation results
indicate that the HITCI-doped-ORMOSIL is an effective solid-state Q switch for the ruby laser. For
typical configuration, a Q-switched laser pulse of 210 ns in duration and 24 mJ in energy is obtained.