Simulation Software for Laser Heating of Multilayer Stacks


Laser Beam Profile, Pulse Shape, and Velocity

In TEMPROFILE there is incident on the stack (either from the top or from the bottom) a circularly symmetric, monochromatic beam of light (wavelength = l0) The radial profile of the beam's intensity distribution is allowed to be either Gaussian or user-defined. In the first instance the user need only specify the 1/e radius of the Gaussian beam. In the second case the entire intensity profile must be entered, point by point, either from the keyboard or from a data-file residing within the working subdirectory.

The beam incident on the multilayer stack has a fixed spatial profile, but its power P (i.e., integrated intensity over the beam's cross-section in the XY-plane) can vary with time t (see the figure below). The beam is also allowed to move with constant velocity V over the stationary stack. Here it is generally assumed that the incident optical power is zero prior to t = 0, the beam center coordinates at t = 0 are (x, y) = (0, 0), and the beam moves along the positive X-axis.


(a) Spatial intensity distribution of the Gaussian laser beam throughout the multilayer stack. This is a circularly symmetric Gaussian profile, having radius r0 at the 1/e (intensity) point.

(b) A typical time-dependence of the power of the laser beam, P(t). This piecewise linear function is identified by the coordinates of its corner points, (ti, Pi).

  1. Quadrilayer Magneto-optical Disk

  2. Quadrilayer Stack Illuminated through Substrate

  3. User-defined Laser Beam Profile


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