Simple modelling of nonlinear losses induced by Kerr lensing effect

Optical tweezers based on nonlinear focusing

“…Before to proceed, it is important to justify the choice of a focal length equal to 50mm which clearly does not achieve the tight focusing usually implemented in optical tweezers. There are two reasons for this choice: first, the use of identical parameters as in previous work [10] concerning the influence of spherical…”

“…-0,1 0,0 0,1 0,0 0,5 In the next, we will consider the beam width D W as the "true" value compared to the beam widths G W (GA modelling) defined hereafter. The peculiarity of the diffraction of a Gaussian beam on a Kerr phase profile is that the 2 M factor of the beam emerging from the Kerr medium depends only on the phase shift 0  for a given wavelength [10]:…”

The Advantages and Disadvantages of Using Structured High-Order but Single Laguerre–Gauss LGp0 Laser Beams

“…The basic elements of the limiting device are a nonlinear Kerr medium of thickness d characterised by a nonlinear refractive index n 2 , a linear lens of focal length f L , and a diaphragm of radius R D set at a distance L from the ensemble (Kerr medium + lens). Note that it has recently [48] been shown that the position L of the diaphragm is relatively critical since the ensemble (Kerr medium + lens + aperture) acts (i) like a saturable absorber if L < f L , and (ii) is an optical limiting device if L ≥ f L .…”

“…The basic elements of the limiting device are a nonlinear Kerr medium of thickness d characterised by a nonlinear refractive index 2 n , a linear lens of focal length L f , and a diaphragm of radius D R set at a distance L from the ensemble (Kerr medium + lens). Note that it has recently [48] been shown that the position L of the diaphragm is relatively critical since the ensemble (Kerr medium + lens + aperture) acts (i) like a saturable absorber if It is worth noting that the transmission of a saturable absorber (optical limiter) increases (decreases) with increasing input power. The operating principle of the OPL based on the Kerr effect can be easily understood by considering the Kerr lensing effect, which shifts the best focal point at position max z at high power, while the best focus is located at position z = L at low power.…”