Miniature Raman spectroscopy utilizing stabilized diode lasers and 2D CMOS detector arrays

Bryan Auz; Joseph Bonvallet; John Rodriguez; Ty Olmstead

doi:10.1117/12.2252396

20 February 2017 Miniature Raman spectroscopy utilizing stabilized diode lasers and 2D CMOS detector arrays

Bryan Auz, Joseph Bonvallet, John Rodriguez, Ty Olmstead

Proceedings Volume 10110, Photonic Instrumentation Engineering IV; 1011019 (2017) https://doi.org/10.1117/12.2252396
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

A miniature Raman spectrometer was designed in a rapid development cycle (< 4 months) to investigate the performance capabilities achievable with two dimensional (2D) CMOS detectors found in cell phone camera modules and commercial off the shelf optics (COTS). This paper examines the design considerations and tradeoffs made during the development cycle. The final system developed measures 40 mm in length, 40 mm in width, 15 mm tall and couples directly with the cell phone camera optics. Two variants were made: one with an excitation wavelength of 638 nm and the other with a 785 nm excitation wavelength. Raman spectra of the following samples were gathered at both excitations: Toluene, Cyclohexane, Bis(MSB), Aspirin, Urea, and Ammonium Nitrate. The system obtained a resolution of 40 cm^-1. The spectra produced at 785 nm excitation required integration times of up to 10 times longer than the 1.5 seconds at 638 nm, however, contained reduced stray light and less fluorescence which led to an overall cleaner signal.

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Citation Download Citation

Bryan Auz, Joseph Bonvallet, John Rodriguez, and Ty Olmstead "Miniature Raman spectroscopy utilizing stabilized diode lasers and 2D CMOS detector arrays", Proc. SPIE 10110, Photonic Instrumentation Engineering IV, 1011019 (20 February 2017); https://doi.org/10.1117/12.2252396

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