Design of a Temperature Control System for Ti: Sapphire Lasers

Laser plays a crucial role in polarizing and detecting atomic spins, making it a key component in quantum precision magnetic field and inertial measurement devices. The titanium sapphire laser is an important light source in these devices due to its tunability, high power, short pulse width, and excellent beam quality. However, the thermal effects of the Ti³⁺:sapphire crystal can impact the laser's performance. This paper analyzes these thermal effects using COMSOL simulations and proposes an advanced temperature control system, featuring a high-power low-noise power supply, temperature acquisition and control modules, and a TEC as the temperature control actuator. An active disturbance rejection controller (ADRC) is also designed, with experimental studies conducted.