# Discussion Forum

## Multi-pass continuous laser beam scan

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RSS feed   |   Turn on email notifications   |   4 Replies   Last post: October 5, 2012 6:45am UTC

uday

October 4, 2012 11:10am UTC

Multi-pass continuous laser beam scan

Hi ,

i have one basic question about Multi-pass continuous laser beam scan . i have moved laser beam (Gaussian)with same velocity in y-direction on plate from one end to other end. it was taking 3 sec. then, i want to move heat source from (3.2 sec) original position. Is this possible in comsol GUI? or We should use any script language?

can we use any function to obtain the second time scan?

i used the following heat source for first scan

500[MW/m^3]*an1(sys2.r[1/m])

Ivar Kjelberg

October 4, 2012 11:57am UTC in response to uday

Re: Multi-pass continuous laser beam scan

Hi

how do you scan w.r.t. to time ? there were a few threads already discussing raster scanning and functions to provide the trajectories ;)

Do not forget that you make discontinuities when you make sudden jumps, this gives some issues often for the solver to converge

--
Good luck
Ivar

uday

October 4, 2012 12:20pm UTC in response to Ivar Kjelberg

Re: Multi-pass continuous laser beam scan

Hi ivar,

thank you for your quick reply. i want to move laser beam w.r.t time. i have used (V*t) this expression. V-is a speed of laser beam. i have used cylinderical co-ordinates to movement.but , i could not get the second pass.

How can i get second pass?

then,i want to move the spot w.r.t time and space?
how can acheive?

can you give any example (time and space dependent)?

sorry for the lot of questions

thank you ivar...

Alexander Kuznetsov

October 4, 2012 4:45pm UTC in response to uday

Re: Multi-pass continuous laser beam scan

define to different functions, one for each type of movement. Then combine them through boolean operators: f1*(t<t1)+f2*(t>t2)

uday

October 5, 2012 6:45am UTC in response to Alexander Kuznetsov

Re: Multi-pass continuous laser beam scan

Hi Alex,

thank you for your response. but i could not understand. can you explain more....where can i find boolean operator..

i want to pass the (moving heat flux) beam 3 times in same path.can i use boolean operator..

can you help me?

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