Design and construction of a tunable pulsed Ti:sapphire laser

Abstract

In this paper, design and construction of a tunable pulsed Ti:sapphire laser and numerical solution of the corresponding rate equations are reported. Rate equations for a four-level system are written and their numerical solution is examined. Furthermore, an optical setup is introduced. In this setup, a Ti:sapphire crystal is longitudinally pumped by the second harmonics of a Q-Switched Nd:YAG laser, and a prism is used as a wavelengthselective element as well. This setup is established for two 10 and 50 % transmission output couplers. In case of using the 10 % coupler, the output energy of the laser, for the pump energy of 36 mJ, is pulses with 3.5 mJ energy and for the 50 % coupler, with 50 mJ of pump energy, pulses with 10 mJ energy are generated. A wavelength tuning range of more than 160 nm is possible. The repetition rate of this laser is 10 Hz and the temporal duration of the pulses is about 30 ns.

Estimation of Crystallite Size, Density, and Compositional of the Ti: Al2O3 Single Crystal

“…Titanium-doped sapphire (Ti: Al2O3) is an excellent laser material (Nehari et al, 2011;Sawada et al, 2017). It is the most widely used crystal for wavelength-tunable laser (Panahi et al, 2015;Wu et al, 2020), and it is a leading material in the field of femtosecond pulse lasers (Kozlov & Samartsev, 2013). The Ti: Al2O3 single crystal with high quality and uniform dopant distribution can be produced as a highpower tunable laser with a range of wavelengths around 600nm to 1100nm (Raeder et al, 2020;Sawada et al, 2017;Zong et al, 2019).…”

Studying tunability of some NIR semiconductor lasers by external cavity setup

“…This type of lasers can be used for various applications such as laser spectroscopy experiments, the telecommunications industry, a source for pumping other lasers, measuring and manipulating the quantum state of atoms, laser cooling and generation of terahertz radiation [2][3][4][5][6][7][8][9]. Nowadays, using lasers with varying wavelengths is an interesting field of research [10]; therefore, lasers will turn more applicable when their wavelengths can be tuned. There are a number of tuning mechanisms; one of them is using an external cavity as a feedback section.…”