The purpose of a temperature control system is to maintain a device at a constant temperature. Two types of thermal components are commonly used to precisely control the temperature of optics, lasers, biological samples, or other temperature sensitive devices. One is a thermoelectric. The other is a resistive heater.
Links referenced in the video:
TN-TC01: Optimizing Thermoelectric Temperature Control Systems
Safe Operating Area Calculator for Laser Diode Drivers
Safe Operating Area Calculator for Temperature Controllers
AN-TC15: Compliance Voltage & Temperature Control Design with Multiple Thermoelectric Coolers
TN-TC02: How is Temperature Stability Measured?