Create a laser from sun light I have read on wikipedia the basic theory behind laser. A photon passes through an excited electron which then produces the exact same photon. Light is bounced off mirrors to create more photons.
Is it possible to make sunlight passes through an optical amplifier to create a amplified sun light stream ?
Ideally the solution could be use with a simple machine that produces laser but instead takes external light as an input. The application would be to put sunlight into an optical fiber and amplify the number of photons using the technique above.
 A: An inverted laser medium can be used to amplify light in general so in principle this is perfectly possible. The output would however inherit the properties of the sun light and you would not get a laser like type of radiation. What you also have to keep in mind is the limited gain bandwidth of typical laser materials. Ti:sapphire is an example of a very broadband laser medium and still has only $\sim 200\text{ nm}$ gain bandwidth around a center wavelength of $800 \text{ nm}$. Sunlight on the other hand spans the entire visible spectrum. In the figure you can see the actual solar spectrum on the surface and a toy gain profile roughly similar to that of Ti:sapphire 
The laser medium will only amplify a certain wavelength range of the sun light so the amplfied sun light would basically mimic the gain profile of the laser medium. The output would just be an spatially and temporally incoherent reddish beam. In the second figure you can see the solar spectrum after amplification with the toy gain profile for various thicknesses of the laser medium.

In my answer I have assumed that you are asking about amplifying sun light with an inverted medium, which is pumped externally. Dirk Bruere's answer and the comments have assumed that you want to invert the medium with sun light.
A: Sun pumped laser

The two most studied lasing media for solar-pumped lasers have been
iodine,1 with a laser wavelength of 1.31 micrometers, and NdCrYAG,
which lases at 1.06 micrometers wavelength... The largest solar-pumped
laser is currently being operated by a research facility in
Uzbekistan. It is a 1 MW solar input power NdYAG type laser, operating
at 3,000 degrees C. It is cooled by distilled water.

NdCrYAG is a Neodymium Chromium Yttrium Aluminium Garnet crystal. Iodine, is elemental Iodine. It is not a simple DIY project. More here and Another link
A: In principle there is nothing wrong with your idea. But I think it is not viable by DIY, at least not with the results I guess you'd be expecting, with such a small understanding of the subject (read: Wikipedia is definitely not enough, and if you were to do things seriously the Sun would be the last source you'd be thinking of). First of all, any lasing medium (the object which contains the excited electrons) only amplifies light in a restricted bandwidth, which means that nearly all the power of sunlight would be wasted. There is no such thing as a "simple machine that produces laser", each laser is built to lase light around a narrow range of wavelenghts. Second of all, in order to DIY an efficient laser without using any pre-built component (which here is the case, as I guess there are no pre-built components for "efficient" solar lasers), you need to know the physics and mathematics behind the lasing mechanism, which includes a basic knowledge on the interaction between radiation and light, some more advanced knowledge on the dynamics of the electromagnetic field both in vacuum and in media, and an actual knowledge of how the theory applies to lasers. Last but not least, with no pre-built components you must be able to do some precision measurements. For example, the laser's resonant cavity (roughly speaking, the apparatus that hosts the mirrors) must be finely tuned in order to be able to amplify the signal.
If you are still determined to build the laser I advise you to get a copy of Svelto's "Principles of Lasers" and/or Saleh's "Fundamentals of Photonics". Here theory is explained in some detail, together with applications to specific laser designs.
