The laser oscillation condition for an N-mirror system is found. Examples are given for systems with as many as five mirrors.Christian PedersenTorben SkettrupC. Pedersen and T. Skettrup, "Laser modes and threshold conditions in N-mirror resonators", Journal of the Optical Society of America B...
6、 of atoms in level 1 is short compared to t2,we can neglect N1 compared to N2 and the threshold condition is satisfied when N2Nt.Therefore,laser oscillation begins when the upper laser level acquires,by pumping,a population density equal to the threshold value Nt.参与激光作用的下能级是基...
The laser threshold is an operation condition of a laser where laser emission just starts to occur.
At such an intense excitation condition, cryogenic operation is widely adopted to promote optical gain and prevent device damages7,9,12, which considerably limits the practical applications. Till now, it is still a big challenge to realize low-threshold room temperature SP laser. Ultraviolet laser ...
Here we derive the OB criterion for the composite as Criterion = 2(1 − f ) e2EF π2ω2aε0 ⋅ ω2 − 3 ωτ−1 ω2 + τ−2 − [ε (1 − f) + εh (2 + f )]. (25) Only for the condition that Criterion > 0, this composite could exhibits OB....
a field which is below the critical transition, the fluid molecules 18, remain unchanged in their orientation. Under this condition, the motion of the particles 16 is significantly hindered. In other words, the apparent viscosity of the medium in the direction of the applied field is very high...
Relevant modes selection method based on Spearman correlation coefficient for laser signal denoising using empirical mode decomposition Opt. Rev., 23 (6) (2016), pp. 936-949 Google Scholar [46] H.Y. Song, S. Park An analysis of correlation between personality and visiting place using Spearman...
In latch mode, when an out-of-range condition is detected and the OUT pin is pulled low, the OUT pin does not return to the default high level when the input signal drops below the trip threshold level. To clear the event, the LATCH terminal must be pulled low for at least 4 μs....
A high-performance topological laser could pave the way for its use in a wide range of nanophotonic applications. Semiconductor lasers are the most common type of laser, but their performance deteriorates if there are any structural defects in the lasing material. Topological lasers allow light to...
Finally, the optical bistability at higher terahertz frequency and the influence of relaxation time under the actual experimental condition on Fermi-level are discussed. Graphene has outstanding optical and electrical characteristics1–4 and hence shows great potential applications in optoelectronic devices4...