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Hyperspectral digital holography realized by using an electro-optical frequency comb via injection locking
Optics Letters
|March 15, 2024
Summary
A new hyperspectral digital holography (HSDH) system uses a single electro-optical frequency comb (EOFC) for faster, simpler, and cheaper 3D imaging with spectroscopic data. This advanced HSDH technique achieves high-resolution imaging and spectral analysis simultaneously.
Area of Science:
- Optics and Photonics
- Holography
- Spectroscopy
Background:
- Hyperspectral digital holography (HSDH) combines holographic imaging with spectroscopy.
- Existing HSDH systems often require complex setups, such as dual-comb configurations.
- There is a need for more efficient and cost-effective HSDH systems.
Purpose of the Study:
- To propose and demonstrate a novel, simplified HSDH system.
- To utilize an electro-optical frequency comb (EOFC) for improved performance.
- To achieve simultaneous 3D imaging and spectral analysis.
Main Methods:
- Implementation of a novel HSDH system using a single EOFC via injection locking.
- Validation with an EOFC generating 20 optical frequencies at 18 GHz intervals.
- Acquisition of holographic images and transmission spectra.
Main Results:
- Successful imaging of two targets with a 0.74 mm separation without phase ambiguity.
- Simultaneous acquisition of the transmission spectrum of an absorbing gas.
- Demonstration of improved imaging speed and system simplification compared to dual-comb HSDH.
Conclusions:
- The proposed single-EOFC HSDH system offers a simplified, cost-effective, and faster alternative.
- This technique enables simultaneous high-resolution 3D imaging and spectroscopic analysis.
- The findings provide valuable insights for future HSDH system development using optical frequency combs.
