I have an experiment with He-Ne laser in my practical syllabus. In curiosity I took a photo of the incoming radiation directly from the laser with my mobile camera. Some strange pattern is observed. The photographs are attached below. Is this just an interference pattern or something beyond that?
I did a couple of experiments with a DSLR and a cheap red home improvement laser level. The most revealing factor is that a direct reflection of the laser on the CCD sensor gives a distinct square diffraction pattern. This is pretty much what one would expect from a camera that has square pixels. The reflections have sharp peaks that are spaced fairly far apart (the sensor has 4.7um pixel size and forms a very precise grating). When this pattern is reflected back from the surfaces of the lens, it could form the large scale structure seen in the images. I would agree with Jaswin that the ring structures seen on these reflections are probably Newton rings.
It seems like some kind of Newton rings formed. Does your mobile camera has a flat thin sheet covering the lense. If so, the newton rings formed is captured in the sensor. Having said that, I can't explain why there are multiple of them, that too in a lattice formation. May be if the distance between the thin sheet and lense increases we have various newton rings. Also the stretching on the edges is because the laser is of finite width.