Abstract
Plane gratings are widely used as dispersion elements in spectral analysis from the infrared to x-ray regions. This study proposes an optical element, consisting of only a reflection focusing and dispersion plane grating (RFPG) designed for a specific wavelength. A raytracing simulation and a visible light experiment were performed to verify the focusing and wavelength dispersion properties of the proposed RFPG. The raytracing simulation result shows that the designed 635 nm RFPG has a spectral resolution (λ/∆λ) of 423 (linear dispersion = 493.8 eV/m) under specific conditions. Additionally, in the visible light experiment, the spectral resolution of 423 (linear dispersion = 493.8 eV/m) and band range of ±25 nm were obtained at the target wavelength of 635 nm. The experimental results indicate that the proposed optical element, RFPG, exhibits focusing and dispersion properties for a designed wavelength. It is a potential tool for the study of x-ray fluorescence, absorption, and advanced x-ray sources, such as laser wakefield Betatron x-ray sources.
Highlights
A reflection grating is a dispersive element that is widely used in spectrometers and monochromators from the infrared to x-ray regions of the electromagnetic spectrum
Based on the Fresnel zone method, a novel type of plane grating with reflection focusing (RFPG) for a specific wavelength is proposed in this study
A spectral resolution (λ/∆λ) of 423 and a band range of ±25 nm were obtained around the target wavelength of 635 nm
Summary
A reflection grating is a dispersive element that is widely used in spectrometers and monochromators from the infrared to x-ray regions of the electromagnetic spectrum. Traditional spectrometers using gratings have the advantages of high resolution and broadband spectral response, their light transmission efficiencies are low as the light must transmit through at least four surfaces.. Based on the Fresnel zone method, a novel type of plane grating with reflection focusing (RFPG) for a specific wavelength is proposed in this study. This new type of grating is proposed as a potential tool for the study of x-ray fluorescence, absorption spectra, and advanced x-ray sources, such as laser wakefield Betatron x-ray sources.. A special raytracing program embedded in X-LAB was developed for investigating the focusing and dispersive properties of the RFPG.. The experimental results are in good agreement with the raytracing simulation results
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