Wavelength alteration measurement using the Moiré technique

Area of Science:

• Optics and Photonics
• Metrology

Background:

• Accurate wavelength measurement is crucial for various optical applications.
• Existing methods for wavelength alteration measurement can be complex or less reliable.

Purpose of the Study:

• To develop a novel, simple, and reliable method for measuring wavelength alterations.
• To translate wavelength changes into measurable Moiré pattern rotations.

Main Methods:

• Utilized a dispersive planoconvex lens to induce chromatic aberration.
• Monitored the rotation of the Moiré pattern as a function of wavelength change.
• Experimentally validated the method using four different laser wavelengths (450, 532, 630, and 632.8 nm).

Main Results:

• Demonstrated that chromatic aberration causes wavelength-dependent magnification, leading to Moiré pattern rotation.
• Observed a total Moiré pattern rotation of approximately 31.5° across the tested wavelengths.
• Achieved good agreement between theoretical predictions and experimental results.

Conclusions:

• The proposed Moiré pattern rotation method offers a simple and reliable way to measure wavelength alterations.
• This technique has potential applications in spectrometry, optical sensors, and dispersion measurements.
• The method leverages chromatic aberration for precise optical metrology.