Multi-wavelength excitation Raman spectrometers and microscopes for measurements of real-world samples

William Yang; Huawen Wu; Jack Qian; Lin Chandler; Chad A. Lieber; Claire Dentinger

doi:10.1117/12.970567

30 October 2012 Multi-wavelength excitation Raman spectrometers and microscopes for measurements of real-world samples

William Yang, Huawen Wu, Jack Qian, Lin Chandler, Chad A. Lieber, Claire Dentinger

Proceedings Volume 8546, Optics and Photonics for Counterterrorism, Crime Fighting, and Defence VIII; 854603 (2012) https://doi.org/10.1117/12.970567
Event: SPIE Security + Defence, 2012, Edinburgh, United Kingdom

Abstract

We report on a variety of BaySpec’s newly developed Raman spectrometers and microscopes combining multiple excitation wavelengths and detection ranges. Among those there are the world’s first dual-wavelength near infrared (NIR) and infrared miniature Raman spectral engines built with Volume Phase Gratings (VPG^TM), and the world’s first three-wavelength (532, 785, and 1064-nm) excitation Raman microscope. Having multiple wavelength excitations in one unit offers extreme flexibility and convenience to identify the best laser wavelength and investigate a great variety of real-world samples. In real-world Raman measurements, fluorescence is the biggest obstacle which significantly reduces the quality of the Raman spectra. We demonstrate many examples spanning from explosives to street drugs to conclude that for those samples, 1064-nm Raman is fluorescence-free and best suited for identification. Other types of miniaturized Raman spectrometers have been realized, enabling handheld, portable, or at-line/ on-line applications for real-world sample measurements, such as threat determination of explosives, chemical and biological materials, quality assurance and contamination control for food safety, and forensics such as evidence gathering, narcotics identification, and anti-counterfeiting.

Citation Download Citation

William Yang, Huawen Wu, Jack Qian, Lin Chandler, Chad A. Lieber, and Claire Dentinger "Multi-wavelength excitation Raman spectrometers and microscopes for measurements of real-world samples", Proc. SPIE 8546, Optics and Photonics for Counterterrorism, Crime Fighting, and Defence VIII, 854603 (30 October 2012); https://doi.org/10.1117/12.970567

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