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ref: -0 tags: optical gain media lasers cross section dye date: 06-13-2019 15:13 gmt revision:2 [1] [0] [head]

Eminently useful. Source: https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-974-fundamentals-of-photonics-quantum-electronics-spring-2006/lecture-notes/chapter7.pdf

Laser Dye technology by Peter Hammond

  • This paper is another great resource!
  • Lists the stimulated emission cross-section for Rhodamine-6G as 4e-16 @ 550nm, consistent with the table above.
  • At a (high) concentration of 2mMol (1 g/l), 1/e penetration depth is 20um.
    • Depending on the solvent, there may be aggregation and stacking / quenching.
  • Tumbling time of Rhodamine 6G in ethanol is 20 to 300ps; fluorescence lifetime in oscillators is 10's of ps, so there is definitely polarization sensitive amplification.
  • Generally in dye lasers, the emission cross-section must be higher than the excited state absorption, σ eσ \sigma_e - \sigma^\star most important.
  • Bacteria can actually subsist on rhodamine-similar sulfonated dyes in aqueous solutions! Wow.