Alignment Stability Depends on Continuous Feedback
Alignment errors are rarely sudden. They accumulate.
Then alignment starts to drift.
Thermal expansion, vibration, and gradual tool wear introduce continuous micro-shifts in beam position. These shifts are often too small for periodic calibration to capture in time.
In lithography and inspection systems, alignment stability depends on continuous feedback. Without it, small positional deviations build up and affect overlay accuracy and repeatability.
Position-sensing photodiodes from GPD Photodiodes enable:
- Continuous beam position monitoring
- High sensitivity with low crosstalk
- Reliable tracking under dynamic conditions
Drift becomes manageable when it is observable in real time.
About GPD Optoelectronics
Founded in 1973, GPD Optoelectronics began by making high-quality germanium transistors, but since the early 1980s the company manufactures both germanium and indium gallium arsenide photodiodes and multi-element photodetectors. In addition to offering a variety of off-the-shelf products, GPD specializes in providing customized parts that are uniquely tailored to customer applications. GPD has the agility to design and deliver prototypes of custom products often within just a few weeks.
GPD’s products include:
- Photodiodes
- Position sensing photodiodes
- Specialty photodiodes
- Packaging Options
- Multi-Cell Photoreceiver (MCPR) Development Kits
To request more information or a quotation for these or other GPD products, contact IL Photonics.