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Gouy phase shift in nondiffracting Bessel beams.
Paolo Martelli1, Matteo Tacca, Alberto Gatto
1Politecnico di Milano, Dip. di Elettronica e Informazione, PoliCom, Via G. Colombo 81, 20133 Milano, Italy. martelli@elet.polimi.it
Optics Express
|April 15, 2010
Summary
Bessel beams exhibit a nondiffracting property due to an axial phase shift, known as the Gouy phase shift. This study experimentally verifies the Gouy effect in Bessel beams using a Mach-Zehnder interferometer.
Area of Science:
- Optics and Photonics
- Quantum Optics
Background:
- The Gouy effect describes an additional phase shift experienced by a wave upon focusing.
- Bessel beams are known for their non-diffracting propagation characteristics.
Purpose of the Study:
- To theoretically and experimentally investigate the Gouy effect in Bessel beams.
- To analyze the relationship between the Gouy phase shift and Bessel beam properties.
Main Methods:
- Theoretical analysis of the Gouy phase shift in Bessel beams.
- Experimental setup using a free-space Mach-Zehnder interferometer.
- Interference pattern analysis of Bessel beams (orders 0-3) and a Gaussian beam at 633 nm.
Main Results:
- The Gouy phase shift in Bessel beams increases linearly with propagation distance.
- The rate of Gouy phase shift variation is independent of Bessel beam order.
- Experimental interference patterns confirm the predicted spatial periodicity due to the Gouy phase shift.
Conclusions:
- Bessel beams' nondiffracting nature is intrinsically linked to the Gouy phase shift.
- The Gouy phase shift is a crucial factor in understanding Bessel beam propagation dynamics.
- Experimental validation confirms theoretical predictions of the Gouy effect in Bessel beams.
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