Fiber-optic holography employing multiple beam fringe stabilization and object/reference beam intensity variability

Area of Science:

• Optics and Photonics
• Interferometry
• Holography

Background:

• Fiber-optic holographic systems face challenges with environmental phase changes and illumination control.
• Conventional holography techniques are often impractical for remote sensing applications.

Purpose of the Study:

• To design and demonstrate stable, versatile fiber-optic holographic systems.
• To overcome inherent shortcomings of existing fiber-optic holographic setups.
• To enable practical remote holographic interferometric sensing.

Main Methods:

• Utilized a Michelson interferometer with a closed-loop feedback system to minimize optical phase changes.
• Employed passive single-mode couplers for complete object illumination via multiple fibers.
• Implemented a Mach-Zehnder interferometric technique for controlling object and reference beam intensity ratios.

Main Results:

• Demonstrated minimization of environmentally induced optical phase changes.
• Achieved complete object illumination using multiple illumination fibers.
• Successfully controlled object and reference beam intensity ratios.
• Experimental results confirmed high fringe visibility and stability.

Conclusions:

• The developed fiber-optic holographic systems are highly stable and versatile.
• These systems are suitable for remote holographic interferometric sensing.
• The techniques address limitations of conventional holography in practical applications.