Dear All OPtics friends: I am looking to buy few Laser diodes at center wavelength of 1310nm with ex-fiber power to be around 10 to 100mW. The Fabry Perot geometry is not something that I wish to have due to multi peaks present due to FP cavity effects. I wish to have a single peak which is broad enough to get the 3dB spectral width in the range of 2 to 10nm. Could you please help me giving me contact details of the manufacturere of such a device? Many thanks in advance.
The excited ("pumped up") atoms in a laser both provide gain for any optical signals inside or sent into the laser within the laser gain bandwidth through what's called "stimulated emission", and also spontaneously emit incoherent light from the same atoms across the full amplification bandwidth of the laser transition, through what's known as "spontaneous emission" (aka fluorescence).
This spontaneous emission is relatively weak -- it's essentially a noise source inside the laser -- but if the laser has enough gain (which in practice means if it's long enough), this spontaneous emission will be strongly amplified by the gain mechanism as the spontaneously emitted light passes down the long laser; and the laser will squirt significant amounts of _amplified spontaneous emission_ (ASE) out of one or both ends, even with no input signals and no end mirrors to provide feedback.
Fibers are a natural for this, since they're naturally very long, can have very high gain, and automatically trap the amplified spontaneous emission within the fiber. Commercial lasers of this type are available for use in optical tomography and other applications. One emerging commercial source (look at their "Products" page) is
which I know about because I have a connection with them; but there are others. (You are talking commercial prices here, e.g. multiple K$.)
Mother Nature also makes ASE lasers: there are huge ASE lasers out in space, and in the atmosphere of Mars, mirrorless of course, formed by immense gas clouds optically pumped by the light of nearby stars.
I think most here have missed entirely what this person is looking for. The ASE sources most are linking to are the 1550nm or 1060nm versions. To get a 1310 ASE you need a praseodymium doped Fluoride based fiber. This type of light source is very difficult to find so I can only imagine the price on it.