Physics.Basic History

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May 12, 2010, at 09:48 PM by 91.67.139.210 -
Changed lines 4-5 from:
Light can be imagine as a wave with a frequency and amplitude. The frequency gives the color (from red to violet) and the amplitude gives the brightness.
to:
Light can be imagine as a wave with a frequency, amplitude and a velocity (in the case of light it is the speed of light). The periodic time is the inverse of the frequency and the wavelength is the length traveled during the periodic time. The frequency gives the color (from red to violet) and the amplitude gives the brightness.
May 12, 2010, at 09:36 PM by 91.67.139.210 -
Changed lines 7-8 from:
In a laser light is oscillating between two mirrors. One mirror is high reflection the other transmit a small part of the light. In the laser only certain types of frequencies can oscillate. If several colors are combined in the right way, small pulses are produced as output. 
to:
In a laser light is oscillating between two mirrors. One mirror is high reflection the other transmit a small part of the light. In the laser only certain types of frequencies can oscillate. If several colors are combined in the right way, small pulses are produced as output. (The square of the electric field is plotted.) 
Changed lines 10-11 from:
More and more colors produces smaller and smaller pulses. In the inset you see the frequency spectrum. It looks like a comb. If all frequencies have a stable phase relation to each other the laser is mode locked.
to:
More and more colors produces smaller and smaller pulses. In the inset you see the frequency spectrum. It looks like a comb. If all frequencies have a stable phase relation to each other the laser is mode locked. (The square of the electric field is plotted.)
Changed lines 13-16 from:
In the two photon spectroscopy two counter-propagating beams interact with a particle. If the particle interact at the same time with two beams, a two photon transition is possible, if the sum of the frequencies in the beams is equal to the transition frequency of the particle. Two photons are absorbed and the excited particle can decay via an third level emitting  red and  blue  light. 


to:
In the two photon spectroscopy two counter-propagating beams interact with a particle. If the particle interact at the same time with two beams, a two photon transition is possible, if the sum of the frequencies in the beams is equal to the transition frequency of the particle. Two photons are absorbed and the excited particle can decay via an third intermediate level emitting  red and  blue  light. 


May 12, 2010, at 05:44 PM by 130.183.91.199 -
Changed lines 10-11 from:
More and more colors produces smaller and smaller pulses. In the inlet you see the frequency spectrum. It looks like a comb. If all frequencies have a stable phase relation to each other the laser is mode locked.
to:
More and more colors produces smaller and smaller pulses. In the inset you see the frequency spectrum. It looks like a comb. If all frequencies have a stable phase relation to each other the laser is mode locked.
May 12, 2010, at 05:44 PM by 130.183.91.199 -
May 12, 2010, at 05:43 PM by 130.183.91.199 -
Changed lines 13-16 from:
In the two photon spectroscopy two counter-propagating beams interact with a particle. If the particle interact at the same time with two beams, a two photon transition is possible, if the sum of the frequencies in the beams is equal to the transition frequency of the particle. Two photons are absorbed and the   


to:
In the two photon spectroscopy two counter-propagating beams interact with a particle. If the particle interact at the same time with two beams, a two photon transition is possible, if the sum of the frequencies in the beams is equal to the transition frequency of the particle. Two photons are absorbed and the excited particle can decay via an third level emitting  red and  blue  light. 


May 12, 2010, at 05:42 PM by 130.183.91.199 -
Changed lines 10-13 from:
More and more colors produces smaller and smaller pulses. In the inlet you see the frequency spectrum. It looks like a comb. If all frequencies have a stable phase to each other the laser is mode locked.


to:
More and more colors produces smaller and smaller pulses. In the inlet you see the frequency spectrum. It looks like a comb. If all frequencies have a stable phase relation to each other the laser is mode locked.

!!! Animation 4 (lower left)
In the two photon spectroscopy two counter-propagating beams interact with a particle. If the particle interact at the same time with two beams, a two photon transition is possible, if the sum of the frequencies in the beams is equal to the transition frequency of the particle. Two photons are absorbed and the   



May 12, 2010, at 05:34 PM by 130.183.91.199 -
Added lines 9-13:
!!! Animation 3 (upper right)
More and more colors produces smaller and smaller pulses. In the inlet you see the frequency spectrum. It looks like a comb. If all frequencies have a stable phase to each other the laser is mode locked.


May 12, 2010, at 05:29 PM by 130.183.91.199 -
Added lines 1-8:
!! Basics

!!! Animation 1 (upper left)
Light can be imagine as a wave with a frequency and amplitude. The frequency gives the color (from red to violet) and the amplitude gives the brightness.

!!! Animation 2 (lower left)
In a laser light is oscillating between two mirrors. One mirror is high reflection the other transmit a small part of the light. In the laser only certain types of frequencies can oscillate. If several colors are combined in the right way, small pulses are produced as output. 

May 12, 2010, at 05:20 PM by 130.183.91.199 -
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May 12, 2010, at 04:00 PM by 130.183.91.199 -
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to:
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May 12, 2010, at 03:59 PM by 130.183.91.199 -
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May 12, 2010, at 03:59 PM by 130.183.91.199 -
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May 12, 2010, at 03:59 PM by 130.183.91.199 -
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