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Thread: Getting Thermal Laser radiation?

  1. #1 Getting Thermal Laser radiation? 
    Forum Freshman Silex7's Avatar
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    i though in something while i was studying thermal radiation in my course , while studying the relation between the Rdiancy due to Temperature, and the wavelenghth lamda,..
    we know from the relation ( R= d(Intensity)/d(wavelength) that means as we increase the temperature of a body it radiated thermaly waves,..and that shows why hot bodies turning to red color while high heating,..because the temp,..reaches the Visible light waves lenghth region as i showed..till reaching the lamda of one of the visible light colors(red,..blue,..etc..)

    so does that mean that can we get
    a Laser high frequency, intensity and very short wavelength ifwe heated a body with high temp till 5000 k or may higher???according to the relation above)..
    Click on the picture below to enlarge and clearify it..

    [/img]


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    Houm...


    I think it wouldn't, as laser is coherent light, it consists of a train of waves of a same energy thus same wavelength/frequency, and they are emitted roughly in the same direction in a single beam. A hot body will emit light of multiple wavelengths, all mixed together, and withtou enough sinchrony to be a laser radiaiton. lasers are created by simtlaneusly exciting many molelcuels of a body so thye synchronise their oscillation and energy level, and thus emit light of a same wavelength in a single wave train, AFAIK (as far as I know).


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    I believe they have these already - they are called "gas dynamic lasers". They usually heat the gas up to a very high temperature by burning some sort of fuel before releasing it into the lasing chamber.
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    Quote Originally Posted by Scifor Refugee
    I believe they have these already - they are called "gas dynamic lasers". They usually heat the gas up to a very high temperature by burning some sort of fuel before releasing it into the lasing chamber.
    but then the gas shomollceulles shoudl be somehow sinchronysed & their enrgy level be mroe or elss homogeneous, not? else thye would be just spreading photons in every direction, of every wavelength, and at any time... I think Carbon Dioxide lasers achieve this by ionising the gas while they heat it.
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    Quote Originally Posted by Lucifer
    Quote Originally Posted by Scifor Refugee
    I believe they have these already - they are called "gas dynamic lasers". They usually heat the gas up to a very high temperature by burning some sort of fuel before releasing it into the lasing chamber.
    but then the gas shomollceulles shoudl be somehow sinchronysed & their enrgy level be mroe or elss homogeneous, not? else thye would be just spreading photons in every direction, of every wavelength, and at any time... I think Carbon Dioxide lasers achieve this by ionising the gas while they heat it.
    The vibrational energy levels of molecules are quantized just like the electronic energy levels - you can cause stimulated emission of vibrational energy just like electronic. Or maybe I'm not understanding you?
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    Quote Originally Posted by Scifor Refugee
    Quote Originally Posted by Lucifer
    Quote Originally Posted by Scifor Refugee
    I believe they have these already - they are called "gas dynamic lasers". They usually heat the gas up to a very high temperature by burning some sort of fuel before releasing it into the lasing chamber.
    but then the gas shomollceulles shoudl be somehow sinchronysed & their enrgy level be mroe or elss homogeneous, not? else thye would be just spreading photons in every direction, of every wavelength, and at any time... I think Carbon Dioxide lasers achieve this by ionising the gas while they heat it.
    The vibrational energy levels of molecules are quantized just like the electronic energy levels - you can cause stimulated emission of vibrational energy just like electronic. Or maybe I'm not understanding you?
    What I am trying to say is that just heating a body won't emit a laser, but some synchornisation has to happen between energy levels and the moment of emission. That is, you need that several molleculles emit exactly the same kind of photon (same quantic energy) at exactly the same time, this is what a laser is: photons of a single quantum level emitted simultaneously in a single train of waves, so all "peaks" and all "valleys" are coincident. Anyway, I guess that some encyclopedia sourcce will help you further, as I may admit that my knowledge on laser technology doesn't reachs much beyond than what I already have said... :?
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    well thanks heavely for all who replyed..i will search more deeply in this matter, although am now convinced that it's not possible to get a laser beam through thermal radiation but it's something deserve to search behind
    thx again for participating my thoughts..
    "Nothing can be accepted in this world, if it did not pass the mathematical proof."

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