[FLASH-USERS] Need help on Simulating fs Laser Interaction in FLASH

[Hansen, Eddie]

Laxman,

You are correct that (for now) FLASH only accounts for absorption via inverse Bremsstrahlung. One way to increase absorption at low temperatures is to increase ms_targZMin. This often works fine for ns or longer pulses, giving reasonable energy deposition and ablation, but short fs pulses may be more difficult to model with FLASH’s current capabilities.

—
Eddie Hansen
Applications Group Leader
Flash Center for Computational Science

On Oct 27, 2025, at 1:08 AM, Laxman Goswami <goswami.laxman at gmail.com> wrote:

Dear Users,

I am new to using FLASH simulations. Recently, I attempted to simulate the interaction of a femtosecond (fs) laser pulse with a helium (He) target. However, I observed very little absorption of laser energy (approximately 0.008%).

From my research, I found some suggestions indicating that FLASH may not be suitable for studying fs laser interactions, as it primarily accounts for Bremsstrahlung ionization.

Could you please advise me on the correct approach to perform these simulations? Am I missing something in my setup, or is FLASH inherently limited for this type of problem?

I would greatly appreciate any guidance or suggestions.

Thank you for your time and help.

Best regards,
Laxman



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