Modified Šolc notch filter for deep ultraviolet applications.

Area of Science:

• Optics and Photonics
• Spectroscopy
• Materials Science

Background:

• Šolc notch filters are crucial for blocking specific wavelengths in optical systems.
• Deep ultraviolet (DUV) spectroscopy presents unique challenges due to high photon energies and material absorption.
• Raman spectroscopy applications, particularly those using tunable lasers, benefit from efficient and versatile wavelength filtering.

Purpose of the Study:

• To design and test a modified optical Šolc notch filter optimized for the deep ultraviolet (DUV) spectral range (190-300 nm).
• To evaluate the filter's capability to block a specific wavelength and generate a sequence of blocked wavelengths.
• To assess the filter's utility for Raman applications employing tunable lasers.

Main Methods:

• Design of a modified Šolc notch filter configuration tailored for DUV performance.
• Experimental testing of the filter's spectral characteristics, including transmission minima and extinction ratios.
• Application of the filter in Raman spectroscopy experiments, specifically analyzing Teflon samples excited at 248.4 nm.

Main Results:

• The modified Šolc notch filter demonstrated high performance in the DUV range.
• Extinction ratios exceeding 240 were achieved.
• Transmission minima exhibited a narrow full width at half-maximum (FWHM) of approximately 1 nm.
• The filter successfully blocked a specific wavelength and produced additional blocked wavelengths.
• Demonstrated utility in collecting Raman spectra of Teflon excited at 248.4 nm.

Conclusions:

• The modified optical Šolc notch filter is effective for DUV applications.
• The filter's ability to provide multiple blocked wavelengths is advantageous for tunable laser Raman spectroscopy.
• The achieved performance metrics (extinction ratio, FWHM) indicate suitability for demanding spectroscopic tasks.