FIS4 requires no vibration isolation platform, provides one-click 3D imaging, and allows for one-step system installation and adjustment.

In the manufacturing and R&D of high-end optical systems, calibration remains a crucial factor determining the system's final performance. From lithography machine objectives to space telescopes, from laser processing systems to medical imaging equipment, the aberration calibration accuracy of optical systems directly affects their resolution and image quality. Traditional calibration methods rely on experienced engineers and complex debugging procedures, which has become a bottleneck restricting the improvement of optical system performance.

The core pain points of traditional optical system calibration:

• Reliance on expert experience – Calibration accuracy is highly dependent on the operator's skill level, and results are difficult to quantify and reproduce.

• Environmental sensitivity and inefficiency – Requires repeated adjustments on a vibration-isolated platform, taking hours or even days.

• Difficult-to-eliminate calibration blind spots – Relying on visual observation and trial-and-error adjustments makes it difficult to detect subtle optical path deviations.

FIS4 Four-Wavefront Sensor: Redefining Optical Calibration Standards

Based on the principle of four-wave transverse shearing interferometry (QWLSI), the FIS4 wavefront sensor offers a breakthrough solution for optical system calibration. Developed over more than a decade since 2006 by Professor Yang Yongying's team at Zhejiang University, this innovative technology is becoming an indispensable tool in modern optical engineering.

✅ Precise aberration identification and quantification

Accurately identifies up to 64 Zernike aberrations, including spherical aberration, coma, and astigmatism.

Achieves 2nm RMS measurement accuracy, capturing even the smallest wavefront distortions.

Real-time display of wavefront phase maps provides a clear visual representation of aberration distribution.

✅ Intelligent calibration guidance

Provides clear adjustment directions and values based on real-time data, reducing reliance on human experience.

Simultaneously monitors key indicators such as PSF and MTF to ensure overall system performance optimization.

Records the entire calibration process to provide data support for subsequent optimizations.

✅ Thermal Stability Monitoring and Compensation

Continuously monitor wavefront changes caused by system temperature rise

Accurately assess the impact of temperature on system performance

Provide compensation solutions based on temperature changes

✅ Closed-loop control and efficient integration

Real-time feedback of measurement results guides the adjustment process, forming a closed-loop control system of 'measurement-feedback-adjustment.'

Supports integration with electric adjustment mechanisms for semi-automatic/fully automatic calibration.

Plug-and-play design and multi-platform compatibility meet calibration needs in various scenarios.

The FIS4 Wavefront Sensor provides a comprehensive calibration solution for high-end optical equipment such as lithography machines, laser systems, adaptive optics, and medical devices. With its nanometer-level precision, intelligent closed-loop control, and real-time thermal drift compensation capabilities, it transforms the traditional experience-based 'artistic' debugging into a data-driven, efficient, and reproducible 'scientific' process, significantly improving calibration efficiency and consistency, and helping optical systems achieve their performance limits.