I would like to know the typical fluence values for getting coherent feedback in random lasing experiments. My source is a 5 ns, 350 mJ max. energy and 10Hz rep. rate q-switched laser. Random lasing medium is a colloid containing Rh6G and TiO2 spheres of 1 micron size. Mean free path is around 20 micron.
I am able to get the general narrowing in the gain profile (after focusing) with energies upto 100 mJ per pulse. Can I go beyond this energy to achieve coherent feedback in random laser?
Of course, You can. I find that 100 mJ is too much and potentially lead to destruction of your gain medium doped with Rh6G molecules
Dear
Yes you can but appear two problems , one related with damage of the active medium if the energy over the threshold damage energy , two the heat generated inside the active medium , specially when operation in PRR.
Regard
Dr. Jassim
How big is your spot size ?
In my experience, I suggest you can compare the pumping energy density or pumping power density with published reports!
The following repeorts may help you a lot.
- Plasmonically enhanced diffusive and subdiffusive metal nanoparticle-dye random laser
- Dependence of random laser emission on silver nanoparticle density in PMMA films containing rhodamine 6G
- Dependence of the random laser behavior on the concentrations of dye and scatterers
- Effective random laser action in Rhodamine 6G solution with Al nanoparticles
- Random lasers with coherent feedback from highly transparent polymer films embedded with silver nanoparticles
- Light diffusion with gain and random lasers
- Coherent random lasers in weakly scattering polymer films containing silver nanoparticles
- Random laser of R6G dye and TiO2 nanoparticles doped in PMMA polymer
- A plasmonic random laser tunable through stretching silver nanowires embedded in a flexible substrate
- Inflection point of the spectral shifts of the random lasing in dye solution with TiO2 nanoscatterers
And so on
GOOD LUCK!
- Badges
- Science topic
- Similar topics
- Computer Science
- Program