Inkscape: Inkscape is a free, open-source vector graphics editor that can import and export .svg and .ai files. You can use it to convert your .png or .svg file into an .ai file by following these steps:

a. Download and install Inkscape from https://inkscape.org.
b. Open Inkscape and import your .png or .svg file (File > Open).
c. If you're working with a .png file, you may need to convert it to a vector format. Use the Trace Bitmap feature (Path > Trace Bitmap) to create a vector image.
d. Save the file as an .ai format (File > Save As > Adobe Illustrator).

Online file converters: There are several online file conversion tools that support .png, .svg, and .ai formats. Some popular options are Zamzar (https://www.zamzar.com/) and Convertio (https://convertio.co/). Keep in mind that uploading files to third-party websites may pose security risks, so use these services with caution.
Alternative vector graphics software: There are other vector graphics editors, like Affinity Designer or Gravit Designer, that can import .png or .svg files and export as .ai or other vector formats that can be used for laser cutting.
Before sending your .ai file to the laser cutter, make sure to check the design and dimensions for accuracy, and consult the laser cutting service for any specific file preparation requirements they may have.
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