Compact echelle spectrometer employing a cross-grating.

Area of Science:

• Optics and Photonics
• Spectroscopy
• Instrumental Science

Background:

• Echelle spectrometers are valuable for high-resolution spectral analysis.
• Traditional designs can be bulky and complex.
• A need exists for compact and simplified spectrometer solutions.

Purpose of the Study:

• To present the concept and implementation of a compact and simplified echelle spectrometer.
• To demonstrate its working principle through experimental measurements.
• To explore and compare manufacturing approaches for a key component.

Main Methods:

• Development of a novel cross-grating combining an echelle grating (5th-11th diffraction orders) and a cross-dispersing grating.
• Manufacturing approaches: Talbot lithography with interference lithography, and direct laser-beam writing.
• Experimental validation of the spectrometer's performance.

Main Results:

• Successful implementation of a compact echelle spectrometer.
• Demonstration of the working principle via experimental measurements.
• Characterization of the spectrometer's performance over a 380-700 nm spectral range with ~2 nm resolution.

Conclusions:

• The developed compact echelle spectrometer is feasible and effective.
• The novel cross-grating design is a key innovation.
• The presented manufacturing methods offer viable routes for fabrication.