Range-finding by triangulation with nondiffracting beams

Area of Science:

• Optics
• Optical Metrology

Background:

• Nondiffracting beams, such as Bessel beams, maintain their size during propagation, making them suitable for alignment tasks.
• Accurate distance measurement is crucial in various scientific and industrial applications.

Purpose of the Study:

• To develop a novel technique for distance measurements utilizing nondiffracting beams.
• To demonstrate the generation and application of intersecting Bessel beams for metrology.

Main Methods:

• Designing a diffractive optical element to generate two off-axis, tilted, nondiffracting Bessel function beams.
• Utilizing a programmable spatial light modulator to control the Bessel beam generation.
• Inducing interference between the two Bessel beams at a specific intersection point.

Main Results:

• Successfully generated two tilted, nondiffracting Bessel beams.
• Achieved interference between the beams at a controlled distance from the input plane.
• Demonstrated the capability for distance measurements based on the interference pattern.

Conclusions:

• The proposed technique enables precise distance measurements using nondiffracting Bessel beams.
• Programmable control over the intersection distance offers flexibility in measurement applications.
• This method has potential applications in alignment and metrology where non-contact distance sensing is required.