G01J 3/4412, G01J 3/0208, G01J 3/021, G01J 3/14, G01J 3/28, G01J 3/18, G01J 2003/1204, G01J 2003/1213, G01J 3/44, G01N 33/0009, G01N 21/031, G01N 2021/651, G01N 21/65, H01S 5/32341, A61B 5/082
A method for enhancement of spontaneous Raman scattering (SRS) from gases comprising a multimode blue laser diode which receives feedback from a near concentric bidirectional multipass cavity in such a way as to generate a circulating power of order 100 W for a sample volume of 10 mm3. The feedback, provided via a volume Bragg grating, reduces the laser bandwidth to 4 cmâˆ’1. Spectra of spontaneous Raman scattering from ambient atmospheric air, detected collinearly with the pump, were recorded with a limit of detection below 1 part-per-million.
Muller, Andreas and Gomez Velez, Juan Sebastian, "Diode-pumped multipass cavity raman gas sensor and method of use" (2023). USF Patents. 1325.
University of South Florida