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Optical active medium
Posted 2010年10月21日 GMT-4 17:57 Wave Optics Version 3.5a, Version 4.0, Version 4.0a 9 Replies
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Do anybody know how to define an active medium in comsol 4.0a? I thought if I set the Relative permittivity to be complex and set the imaginary part to be negative, my medium will work like a active medium. But it seems that it is not that easy.
Best
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Thank you for your reply. My results say something else. I want to calculate the quality factor of a ring resonator. When my refractive index is real I get a number and I make my medium active, I expect to get higher Q-factor (The gain compensate the losses ) . When I make my refractive index complex, with either negative or positive imaginary part, I get a very low quality factor. That seems to me comsol get the imaginary part as loss in any case. Do you have any idea?
Best
Faraz
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All the best :)
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have you tried to write the imaginary part as a function of the total E intensity ?
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Good luck
Ivar
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I doubt if it is possible. Harmonic propagation is strictly for linear effects. For nonlinear stuff you have to use transient analysis. But be sure to check if it is fully equipped to handle all requirements of your simulation.
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indeed that is a good remark, time transint takes time though
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Good luck
Ivar
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i want to know, do comsol FDTD method for simulation of laser?
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However, beware that the transient solver until 3.5a is not in the best equipped form. Lack of PMLs and any built-in support for metals make it practically useless for a lot of realistic scenarios. Don't know if in 4.x series this has been upgraded.
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