High-fidelity phase and amplitude control of phase-only computer generated holograms using conjugate gradient...

Area of Science:

• Optics and Photonics
• Quantum Optics

Background:

• Precise manipulation of light's phase and amplitude is crucial for advanced optical applications.
• Spatial light modulators (SLMs) are key devices for controlling light wavefronts.

Purpose of the Study:

• To demonstrate simultaneous control of light's phase and amplitude.
• To develop a computationally efficient method for generating high-fidelity optical patterns.

Main Methods:

• Utilized a conjugate gradient minimization algorithm for hologram calculation.
• Employed a single phase-only spatial light modulator (SLM).
• Defined a cost function based on the overlap of the light field with a target field.

Main Results:

• Achieved a fidelity of F = 0.999997 for an LG10 mode pattern.
• Calculated a light-usage efficiency of 41.5% for the generated pattern.
• Experimentally realized patterns with F = 0.97 and 7.8% light efficiency.

Conclusions:

• The developed technique enables high-fidelity simultaneous phase and amplitude control of light.
• The method shows promise for applications in optical trapping and ultracold atom manipulation.