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This study presents a new feedback method to rapidly optimize 3D computer-generated holograms (3D-CGHs) for efficient 3D femtosecond laser parallel recording (3D-FLPR) in optical storage.

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Area of Science:

Optics and Photonics
Materials Science
Laser Technology

Background:

High-quality 3D computer-generated holograms (3D-CGHs) are essential for advanced applications like 3D femtosecond laser parallel recording (3D-FLPR).
Conventional CGH systems often suffer from poor quality, limiting their practical use.

Purpose of the Study:

To develop an innovative feedback approach for rapid optimization of 3D-CGHs.
To enable efficient and high-quality 3D-FLPR using a single femtosecond laser pulse.

Main Methods:

Incorporated superposition of calculated lens phases (CLPs) onto 3D-CGHs within a feedback system.
Utilized coordinated control of a spatial light modulator (SLM) and a camera for feedback.
Demonstrated coaxial 3D-FLPR in Ag-doped phosphate glass.

Main Results:

Successfully achieved rapid optimization of 3D-CGHs, overcoming limitations of ordinary CGH systems.
Demonstrated coaxial 3D-FLPR using a single femtosecond laser pulse.
Regulated 3D multi-focus (3D-MF) energy distribution to compensate for intra-glass laser energy losses.

Conclusions:

The presented feedback method significantly enhances the quality and efficiency of 3D-CGHs for 3D-FLPR.
This advancement is particularly impactful for improving the writing efficiency in optical data storage applications.