Enhanced Coherent Emission from Ionized Nitrogen Molecules by Femtosecond Laser Pulses.

08:00 EDT 11th October 2019 | BioPortfolio

Summary of "Enhanced Coherent Emission from Ionized Nitrogen Molecules by Femtosecond Laser Pulses."

The forward emission spectra were experimentally measured for ionized nitrogen molecules by an 800-nm pump laser and a delayed seed laser. It was found that emission lines around both 428 nm and 391 nm are greatly enhanced with injecting either a 391-nm or 428-nm seed laser. The emission lines around 391 nm and 428 nm can be assigned to the rotational transitions of N2+ (B2Σu+, v'=0 → X2Σg+, v=0) and N2+ (B2Σu+, v'=0 → X2Σg+, v=1), respectively. They origin from seed-induced superfluorescence and resonant stimulated Raman scattering. The genetic algorithm was utilized to simulate the experimental observations and determine the relative population of B2Σu+(v'=0), X2Σg+(v=1) and X2Σg+(v=0). The result verifies that the vibrational population inversion is achieved between B2Σu+(v'=0) and X2Σg+(v=0) by the 800-nm pump laser. Our finding provides new insights into controlling the coherent emission of ionized nitrogen molecules, which has promising application in filamentation-based remote atmospheric sensing.


Journal Details

This article was published in the following journal.

Name: The journal of physical chemistry letters
ISSN: 1948-7185


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