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Influence of lateral misalignment on the optical rotational Doppler effect
Applied Optics
|May 3, 2019
Summary
Lateral misalignment affects the bandwidth, not the value, of the optical rotational Doppler shift. This finding is crucial for applying the optical rotational Doppler effect in remote sensing and metrology.
Area of Science:
- Optics and Photonics
- Metrology
- Remote Sensing
Background:
- The optical rotational Doppler effect, linked to light's orbital angular momentum, offers novel methods for measuring object rotation speeds.
- Understanding factors influencing this effect is key for practical applications.
Purpose of the Study:
- To investigate the impact of lateral misalignment on the optical rotational Doppler effect.
- To analyze the generalized formula for rotational Doppler shift when the optical vortex center deviates from the rotation axis.
Main Methods:
- Theoretical analysis of the optical rotational Doppler effect using a local scattering model.
- Derivation of a generalized formula for rotational Doppler shift under lateral misalignment.
- Experimental validation of theoretical predictions.
Main Results:
- The bandwidth of the rotational Doppler signal is found to be directly proportional to the lateral misalignment.
- The magnitude of the rotational Doppler shift remains unaffected by lateral misalignment.
- Experimental results confirm theoretical predictions.
Conclusions:
- Lateral misalignment influences the signal bandwidth but not the shift value in the optical rotational Doppler effect.
- These findings enhance the understanding and applicability of optical rotational Doppler measurements in metrology and remote sensing.
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