thermal blooming

(redirected from Thermal lensing)

thermal blooming

[′thər·məl ′blüm·iŋ]
(optics)
The phenomenon of self-defocusing in certain weakly absorbing media; it is prominent, for example, in the propagation of high-power infrared laser beams through the atmosphere.
References in periodicals archive ?
The rings number increases with increase in concentration, which indicates that when laser passes through the sample, the sample acts like a negative lens [19], This is because with increase in concentration, more number of molecules per unit volume will participate in the interaction and this is due to the induced nonlinear phase shift due to the intensity dependence of the refractive index and thermal lensing.
We observed, increase in induced self-diffraction ring patterns with increase in concentration due to refractive index change and thermal lensing.
Not only benefits of Laser Diode was revealed during the seminar but all other important parameters of Laser technology amid laser beam pointing stability, thermal lensing stability, beam roundness and noise/flicker comparison had been discussed by experts and technical assistant of STPL & Northrop Grumman.
The sapphire must also be very low in optical absorption to prevent any heat from occurring, which can cause thermal expansion and hence thermal lensing.