Littrow-type external-cavity blue laser for holographic data storage

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Holographic data storage requires lasers with specific properties for high-density information recording.
• Existing laser technologies may have limitations in terms of wavelength and output power for optimal storage density.

Purpose of the Study:

• To develop an external-cavity laser optimized for holographic data storage applications.
• To investigate the performance and capabilities of a 405 nm laser for enhanced recording density.

Main Methods:

• Development of an 80 mW external-cavity laser operating at a 405 nm wavelength.
• Characterization of the laser's operational states, including single-mode (14 m coherence length), three-mode (3 mm coherence length), and six-mode (0.3 mm coherence length) configurations.

Main Results:

• The laser exhibits three distinct operational states with varying coherence lengths.
• Angular-multiplexing recording is feasible with the single-mode and three-mode states.
• Coaxial multiplexing recording is supported across all three laser states.
• The 405 nm wavelength enables higher recording density compared to 532 nm lasers.

Conclusions:

• The developed 405 nm external-cavity laser is suitable for high-density holographic data storage.
• The laser's multi-mode capabilities provide flexibility for different multiplexing recording techniques.
• The shorter wavelength offers a significant advantage in achieving superior recording densities.