The BRAVO handheld Raman spectrometer (Bruker Optics) has two temperature-controlled diode lasers (DuoLaser™, 785 and 852 nm), comprising Bragg-grating optical feedback. Both laser beams impinge on the sample sequentially in every measurement, the resulting Raman signal is detected using different areas of the charge-coupled device (CCD), providing a 10–12 cm−1 spectral resolution. Data can be acquired over a relatively large spectral range, from 170 to 2200 cm−1 and from 1200 to 3200 cm−1 exploiting the 852 nm and the 785 nm lasers, respectively. Each laser is temperature-shifted three times over a small wavelength range (about 0.4 nm). As a result, three spectrally shifted raw spectra (by about 6 cm−1) are generated by each of the two lasers from which the processed Raman data is extracted by principal component analysis (PCA).

Dataset
Dataset/Data package (images, spectra, other)
Report

Noncontact (no physical contact)
Noninvasive (no physical alteration)

Bruker Optics

Bravo

100 × 500 micrometers