# A Compact High-Precision Cascade PID-Control Laser Driver for Airborne Coherent LiDAR Applications

## TL;DR

The paper presents a compact laser driver with precise control for airborne LiDAR systems, improving performance in environmental sensing and exploration.

## Contribution

A novel laser driver architecture combining compact design with cascade PID control and frequency–temperature compensation for airborne LiDAR.

## Key findings

- Long-term temperature fluctuation is below 0.007 °C with stabilization under 4 seconds.
- Dual-laser beat frequency adjustment achieves a 3 MHz fluctuation within a -1 GHz to +2 GHz range.

## Abstract

This paper solves the challenge of precise dual-frequency laser control in Airborne Coherent Doppler LiDAR systems by implementing an innovative laser driver architecture, which integrates compact hardware design with cascade Proportional-Integral-Derivative (PID) control and a frequency–temperature compensation mechanism. The experimental results demonstrate eminent performance with long-term temperature fluctuation below 0.007 °C, temperature stabilizing time under 4 s and long-term power fluctuation of the linear constant current source being <1%. The system enables wide-range temperature–frequency adjustment for individual lasers and dynamically adjusts the dual-laser beat frequencies between −1 GHz and +2 GHz, achieving the frequency difference fluctuation within 3 MHz. These achievements greatly enhance LiDAR performance and create possibilities for broader applications in dynamic environmental sensing, atmospheric monitoring, deep-space exploration, and autonomous systems.