 |
Example
3. User-defined Laser Beam Profile
In
this example the quadrilayer stack is illuminated by a user-defined laser
beam profile incident from the surface side.
Calculated
profiles of temperature versus z are shown in Figure (a), and isotherms
in the XY-plane at z = 108 nm appear in Fig. (b).
Shown
below is the file TR03.SYS, which contains the structural parameters of
the multilayer stack, the laser beam profile, and the chosen mesh parameters.
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#
! @@ TEMPROFILE 5.0 File TR03.SYS @@ #
! @@ Date: 01/01/1999 Time: 13:18 @@ #
! @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ #
! #
! Notes: Quadrilayer stack used in Test Run 3. The incident beam profile #
! is user-defined. #
! #
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!#
$ #
Top/Bottom incidence: T #
$ #
Substrate's index (n,k): 1.4600000 .00000000 #
Thermal constants (C,K): 1.7000000 2.00000000E-03 #
$ #
Number of layers: 4 #
$ #
Layer 01: Thickness,n,k: 32.000000 1.2000000 6.9000000 #
C,K: 2.7000000 2.4000000 #
$ #
Layer 02: Thickness,n,k: 72.000000 1.5000000 .00000000 #
C,K: 2.0000000 1.50000000E-02 #
$ #
Layer 03: Thickness,n,k: 12.000000 3.1000000 3.5000000 #
C,K: 2.6000000 .16000000 #
$ #
Layer 04: Thickness,n,k: 100.00000 1.5000000 .00000000 #
C,K: 2.0000000 1.50000000E-02 #
$ #
Heat loss factor (GAMMA): .00000000 #
$ #
Incident Beam Profile: User-defined #
LAMBDA,RS: 632.80000 1000.0000 #
Point on profile (r,I): .00000000 1.0000000 #
Point on profile (r,I): 50.000000 .97260000 #
Point on profile (r,I): 100.00000 .89480000 #
Point on profile (r,I): 150.00000 .77880000 #
Point on profile (r,I): 200.00000 .64120000 #
Point on profile (r,I): 250.00000 .49940000 #
Point on profile (r,I): 300.00000 .36790000 #
Point on profile (r,I): 350.00000 .25640000 #
Point on profile (r,I): 400.00000 .16900000 #
Point on profile (r,I): 450.00000 .10540000 #
Point on profile (r,I): 500.00000 6.22000000E-02 #
Point on profile (r,I): 550.00000 3.47000000E-02 #
Point on profile (r,I): 600.00000 1.83000000E-02 #
Point on profile (r,I): 650.00000 9.10000000E-03 #
Point on profile (r,I): 700.00000 4.30000000E-03 #
Point on profile (r,I): 750.00000 1.90000000E-03 #
Point on profile (r,I): 800.00000 8.00000000E-04 #
Point on profile (r,I): 850.00000 3.00000000E-04 #
Point on profile (r,I): 900.00000 1.00000000E-04 #
Point on profile (r,I): 1000.0000 .00000000 #
Impulse: POWER,TAU,NSTEP: 3.0000000 1.0000000 5 #
$ #
Mesh: RMAX,DLTAR: 2000.0000 25.000000 #
ZMAX,DLTAZ: 400.00000 4.0000000 #
TMAX: 100.00000 #
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#
|
Shown
below is the file GSSN.RIP, which contains the radial intensity profile
(RIP) of the user-defined incident beam in Example 3. The user can modify
the contents of this file with a text editor, then import it to the program
environment during subsequent runs of TEMPROFILE.
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#
! @@ TEMPROFILE 5.0 File GSSN.RIP @@ #
! @@ Date: 12/26/1998 Time: 12:04 @@ #
! @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ #
! #
! Notes: Gaussian intensity distribution with 1/e radius R0=300nm. #
! #
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!#
Point on profile (r,I): .00000000 1.0000000 #
Point on profile (r,I): 50.000000 0.9726000 #
Point on profile (r,I): 100.00000 0.8948000 #
Point on profile (r,I): 150.00000 0.7788000 #
Point on profile (r,I): 200.00000 0.6412000 #
Point on profile (r,I): 250.00000 0.4994000 #
Point on profile (r,I): 300.00000 0.3679000 #
Point on profile (r,I): 350.00000 0.2564000 #
Point on profile (r,I): 400.00000 0.1690000 #
Point on profile (r,I): 450.00000 0.1054000 #
Point on profile (r,I): 500.00000 0.0622000 #
Point on profile (r,I): 550.00000 0.0347000 #
Point on profile (r,I): 600.00000 0.0183000 #
Point on profile (r,I): 650.00000 0.0091000 #
Point on profile (r,I): 700.00000 0.0043000 #
Point on profile (r,I): 750.00000 0.0019000 #
Point on profile (r,I): 800.00000 0.0008000 #
Point on profile (r,I): 850.00000 0.0003000 #
Point on profile (r,I): 900.00000 0.0001000 #
Point on profile (r,I): 1000.0000 0.0000000 #
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#
|
The
file TR03.PLS shown below was created in Example 3, and contains the laser
pulse shape. Pairs of points (t, P) at the corners of the piecewise linear
function P(t), initially entered from the keyboard, are saved in this
file.
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#
! @@ TEMPROFILE 5.0 File TR01.PLS @@ #
! @@ Date: 12/31/1998 Time: 18:34 @@ #
! @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ #
! #
! Notes: Trapezoidal pulse shape of the laser beam. The rise and fall #
! times are 10 nsec each, and the total pulse width is 60 nsec. #
! #
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!#
Point on pulse (t,P): 10.000000 2.0000000 #
Point on pulse (t,P): 50.000000 2.0000000 #
Point on pulse (t,P): 60.000000 .00000000 #
Point on pulse (t,P): 100.00000 .00000000 #
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#
|
(a)
Profiles of temperature versus z at (x, y) = (0, 0) computed at several
instants of time.
(b)
Isotherms in the XY-plane at z = 108 nm, time = 50 ns. The hottest spot
at the center has temperature T = 237.15șC (above ambient). The plotted
isotherms, starting in the middle and moving outward, correspond to T = 237șC,
230șC, 220șC, 210șC, 200șC, 180șC, 160șC, 140șC, 120șC, and 100șC.
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