[SOLVED] Photon Power [was Re: Intensity of a Photon] [Archive]

Curious

Apr7-04, 09:10 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resize=yes,status=no,wi dth=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Uncle Al <UncleAl0@hate.spam.net> wrote in message news:<406DFBCB.FABBCA6E@hate.spam.net>...\n> Curious wrote:\n> >\n> > What determines it?\n> >\n> > What is it measured in?\n>\n> Define "intensity." Do you mean fluence, energy/area, power/area, or\n> what?\n\nPower/Area or wattage. Wattage of the photon.\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Uncle Al <UncleAl0@hate.spam.net> wrote in message news:<406DFBCB.FABBCA6E@hate.spam.net>...
> Curious wrote:
> >
> > What determines it?
> >
> > What is it measured in?
>
> Define "intensity." Do you mean fluence, energy/area, power/area, or
> what?

Power/Area or wattage. Wattage of the photon.

Andrew Resnick

Apr8-04, 05:50 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>\n\n\nIn <34a4f456.0404042233.178bc449@posting.google.com > Curious wrote:\n> Uncle Al <UncleAl0@hate.spam.net> wrote in message news:<406DFBCB.\n> FABBCA6E@hate.spam.net>...\n\n>>\n>> Define "intensity." Do you mean fluence, energy/area, power/area, or\n>> what?\n>\n> Power/Area or wattage. Wattage of the photon.\n\nWatts are energy/time (ML^2/T^3: M = mass, L = length, T = time). Power/\narea has units of M/T^3.\n\nFlux is units of Watts. Exitance, Irradiance and Illumninance have\nunits of W/m^2. Intensity has units of W/sr.\n\nA photon has natural units of energy (frequency) and helicity (\npolarization)\n\n\n--\nAndrew Resnick, Ph. D.\nNational Center for Microgravity Research\nNASA Glenn Research Center\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>In <34a4f456.0404042233.178bc449@posting.google.com> Curious wrote:
> Uncle Al <UncleAl0@hate.spam.net> wrote in message news:<406DFBCB.
> FABBCA6E@hate.spam.net>...

>>
>> Define "intensity." Do you mean fluence, energy/area, power/area, or
>> what?
>
> Power/Area or wattage. Wattage of the photon.

Watts are energy/time (ML^2/T^3: M = mass, L = length, T = time). Power/
area has units of M/T^3.

Flux is units of Watts. Exitance, Irradiance and Illumninance have
units of W/m^2. Intensity has units of W/sr.

A photon has natural units of energy (frequency) and helicity (
polarization)

--
Andrew Resnick, Ph. D.
National Center for Microgravity Research
NASA Glenn Research Center

Richard Saam

Apr8-04, 02:28 PM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Andrew Resnick wrote:\n\n>\n>Watts are energy/time (ML^2/T^3: M = mass, L = length, T = time). Power/\n>area has units of M/T^3.\n>\n>Flux is units of Watts. Exitance, Irradiance and Illumninance have\n>units of W/m^2. Intensity has units of W/sr.\n>\n>A photon has natural units of energy (frequency) and helicity (\n>polarization)\n>\n>\n>\n\nAnd then of course there is the Einstein unit which is a mole of photons.\n\nRichard Saam\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Andrew Resnick wrote:

>
>Watts are energy/time (ML^2/T^3: M = mass, L = length, T = time). Power/
>area has units of M/T^3.
>
>Flux is units of Watts. Exitance, Irradiance and Illumninance have
>units of W/m^2. Intensity has units of W/sr.
>
>A photon has natural units of energy (frequency) and helicity (
>polarization)
>
>
>

And then of course there is the Einstein unit which is a mole of photons.

Richard Saam