Built for harsh shop-floor conditions, the GST-LQ series features an IP65 sealed structure to help resist dust ingress in continuous production. A high-stability copper-mirror optical design supports reliable output under high power, while the dual protective-lens architecture is designed to reduce contamination risk and extend optics service life. For demanding duty cycles, the head adopts an internal-cavity dual water-cooling system, supporting long-duration thermal processing with stable performance. To match common market demand in laser heat treatment (gears, shafts, rings, sleeves, and complex surfaces), the GST-LQ series provides customizable rectangular spot options for uniform heating coverage and controlled temperature gradients. For customers building advanced heat-treatment cells, the head can be configured with CCD monitoring and a closed-loop temperature control system, enabling constant-temperature heating from 400–2500°C (system configuration dependent), which is widely requested for repeatable hardening depth and reduced thermal distortion.