Such grids--called distributed feedback structures--are known to produce the optical effects required for lasing
, but the researchers took it one step further.
The percentage of lasing
and pausing times were calculated for each procedure.
from blue colloidal liquid has been demonstrated in ternary CdZnS/ZnS alloyed core/shell QDs, and quasi-disk WGM microlasers have been realized via a simple modification of the surface tension of water, which deforms the lasing
cavity, and this deformation can be used to modify the lasing
But without any tricks, dark mode lasing
would be quite useless because the light is essentially trapped at the nanoparticle array and cannot leave", adds staff scientist Tommi Hakala.
Interestingly, microcavities can be realized by randomly embedding [Ba.sub.2]La[F.sub.7]:[Yb.sup.3+], [Er.sup.3+] nanocrystals inside the glass and random lasing
action can be achieved in the glass ceramic.
It can occur by single pass gain through high gain ZnO thin films, exciton-exciton scattering with P-band lasing
, electron-hole plasma, surface undulations, P-band lasing
assisted with index guiding through top-down microstructuring, random lasing
, exciton-polariton interaction, or by coherent reflections from parallel hexagons.
Thus, it can be concluded that the lasing
should originate from WG cavity at low pump intensity and F-P cavity at high pump intensity.
Thus, the dielectric environment around the nanoparticle arrays can be tuned, which also tunes the lasing
* Solid state Lasers have a lasing
medium that is solid crystal, like the ruby laser or the neodymium YAG laser, which emits 1.06 micrometer wavelength.
All the above can be explained by that as the current increases the number of carriers supplied to the active region required to start lasing
is reached faster and the turn-on delay decreases.
The two new lasers, developed by a team of researchers from the University of California, San Diego, require very low power to operate, which is an important breakthrough since lasers usually require greater and greater "pump power" to begin lasing
as they shrink to nano sizes.
"They've shown that you can do lasing
action in a live cell without destroying the cell," says physicist Stefan Hell of the Max Planck Institute for Biophysical Chemistry in Gottingen, Germany.