I am trying to create the yellow gradient of the beam.
So, far I have unsuccessfully tried it as
So, I am thinking whether this can be achieved through gradient or blend.
Graphic Design Stack Exchange is a question and answer site for Graphic Design professionals, students, and enthusiasts. It only takes a minute to sign up.Sign up to join this community
Also note that the gradient in your source image will look different in CMYK than in RGB. If you intend to print the design, this won't matter. But deep indigo & fuchsia tones are more drab in CMYK. So if you are having trouble recreating the exact colors in the yellow gradient, this may be good to know.
You can change which color space you work in via File > Document Color Mode.