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Tunable hyperspectral filter based on rotated chirped volume Bragg gratings
Optics Letters
|July 1, 2025
Summary
We developed a novel tunable hyperspectral filter using rotated chirped volume Bragg gratings. This filter offers independent control over wavelength and bandwidth, surpassing current technologies in performance and robustness.
Area of Science:
- Optics and Photonics
- Optical Engineering
- Spectroscopy
Background:
- Spectral filtering is crucial for applications like hyperspectral imaging and optical communications.
- Existing tunable filters (TFTFs, AOTFs, LCTFs) have limitations in tuning range, image quality, and damage threshold.
Purpose of the Study:
- To propose and demonstrate a novel tunable hyperspectral filter.
- To overcome the limitations of current tunable filtering technologies.
Main Methods:
- Utilized rotated chirped volume Bragg gratings for filter design.
- Demonstrated continuous and independent tuning of central wavelength and bandwidth.
Main Results:
- Achieved flexible tuning of central wavelength and spectral bandwidth (FWHM).
- Exhibited steep spectral edges and high out-of-band rejection.
- Demonstrated a higher damage threshold and compact, passive architecture.
Conclusions:
- The novel volume Bragg grating filter offers a robust and efficient alternative to existing tunable filters.
- Its capabilities are advantageous for advanced optical systems requiring precise spectral control.
