How to create gradient of the beam

[Guest]

Hi,

I am using Illustrator 2018 and trying to create the gradient of the yellowish beam.

I have tried creating the gradient but unable to generate the same effect.

[Omar.Fathy · Accepted solution]

make the gradient colors:
01-Yellow with opacity 100%
02-Violet or Purple with opacity 100%

03-Violet or Purple with opacity 0%

you can ignore the color number 02 or make it lower than 100 & make the yellow opacity lower than 100 to be transparent.