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High-precision semiconductor wavelength sensor based on a double-layer photo diode.

Thomas Amthor¹, Christoph S Hofmann, Jürgen Knorz

¹Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany.

The Review of Scientific Instruments

|October 7, 2011

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A new wavelength sensor achieves high accuracy for monochromatic light measurements. This device is ideal for detecting subtle laser frequency shifts in atomic physics research.

Area of Science:

Optics and Photonics
Atomic Physics Instrumentation

Background:

Accurate wavelength measurement is crucial for atomic physics experiments, particularly for monitoring laser frequency stability.
Existing methods may lack the precision required for detecting minute frequency deviations.

Purpose of the Study:

To develop and characterize a high-precision wavelength sensor for monochromatic visible light.
To assess the sensor's suitability for applications in atomic physics, such as measuring laser frequency deviations.

Main Methods:

Utilized a double-layer photodiode (WS-7.56) as the core sensing element.
Implemented high-precision electronics and automatic compensation for error sources.
Calibrated and tested the sensor's performance characteristics.

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Main Results:

Achieved a measurement accuracy of ±0.025 nm.
Obtained a resolution below 0.01 nm.
Demonstrated the sensor's effectiveness in detecting small laser frequency deviations.

Conclusions:

The developed wavelength sensor offers exceptional accuracy and resolution for monochromatic light.
The apparatus is well-suited for precise laser frequency monitoring in atomic physics.
Further analysis of design considerations and error sources is provided.