We present the design and performance of a new triple-grating deep ultraviolet to near-infrared spectrometer. The system is fully achromatic due to the use of reflective optics. The minimization of image aberrations by using on- and off- axis parabolic mirrors as well as elliptical mirrors yields a strong stray light rejection with high resolution over a wavelength range between 165 and 1000 nm. The Raman signal is collected with a reflective entrance objective with a numerical aperture of 0.5, featuring a Cassegrain-type design. Resonance Raman studies on semiconductors and on correlated compounds, such as LaMn O3, highlight the performance of this instrument, and show diverse resonance effects between 1.96 and 5.4 eV.
Bibliographical noteFunding Information:
The authors acknowledge many stimulating discussions with U. Merkt. We are supported by DFG Ru773/2-2, Ru773/2-3, GrK “Physik nanostrukturierter Festkörper.”