View Full Version : Masers
alistair
May22-04, 04:49 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>Are there any masers that amplify signals in the infrared region of\nthe electromagnetic spectrum or in the radio wave frequency region?\nIf not, how could I make one?\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>Are there any masers that amplify signals in the infrared region of
the electromagnetic spectrum or in the radio wave frequency region?
If not, how could I make one?
Mike Crowe
May23-04, 03:13 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>"alistair" <alistair@goforit64.fsnet.co.uk> wrote in message\nnews:861c1b21.0405210411.19168942@posting .google.com...\n> Are there any masers that amplify signals in the infrared region of\n> the electromagnetic spectrum or in the radio wave frequency region?\n> If not, how could I make one?\n>\n\nFor the IR region you are looking at the Terahertz region, where there is\ncurrently a lot of research. It is not a well studied area because reliable\nsources are hard to come by. The Cavendish Labs (Cambridge) have a research\ngroup led by Dr Linfield looking into THz quantum cascade lasers, which look\nlike the best way of achiving lasing in this region. To be honest, other\nthan have a quick look are their posters and things I\'ve never really known\nexactly what it is they are are up to...\n\nhttp://www.phy.cam.ac.uk/research/thz/\n\nMike Crowe\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>"alistair" <alistair@goforit64.fsnet.co.uk> wrote in message
news:861c1b21.0405210411.19168942@posting.google.c om...
> Are there any masers that amplify signals in the infrared region of
> the electromagnetic spectrum or in the radio wave frequency region?
> If not, how could I make one?
>
For the IR region you are looking at the Terahertz region, where there is
currently a lot of research. It is not a well studied area because reliable
sources are hard to come by. The Cavendish Labs (Cambridge) have a research
group led by Dr Linfield looking into THz quantum cascade lasers, which look
like the best way of achiving lasing in this region. To be honest, other
than have a quick look are their posters and things I've never really known
exactly what it is they are are up to...
http://www.phy.cam.ac.uk/research/thz/
Mike Crowe
Oliver Jennrich
May24-04, 04:31 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>* alistair writes:\n\n> Are there any masers that amplify signals in the infrared region of\n> the electromagnetic spectrum or in the radio wave frequency region?\n\nAs MASER is an acronym for Microwave Amplification by Stimulated\nEmission of Radiation, you would encounter difficulties to find masers\nemitting in the infrared.\n\nLasers (replace Microwave by Light in the above acronym) have a\nsucessful history of emitting inrared light (as well as visible and\nultraviolet light).\n\nI\'m not aware of any \'raser\'-device, however.\n\n--\nSpace - the final frontier\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>* alistair writes:
> Are there any masers that amplify signals in the infrared region of
> the electromagnetic spectrum or in the radio wave frequency region?
As MASER is an acronym for Microwave Amplification by Stimulated
Emission of Radiation, you would encounter difficulties to find masers
emitting in the infrared.
Lasers (replace Microwave by Light in the above acronym) have a
sucessful history of emitting inrared light (as well as visible and
ultraviolet light).
I'm not aware of any 'raser'-device, however.
--
Space - the final frontier
Giuseppe Verde
May24-04, 04:31 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\nalistair wrote:\n> Are there any masers that amplify signals in the infrared region of\n> the electromagnetic spectrum or in the radio wave frequency region?\n> If not, how could I make one?\n\nMasers are just lasers in the microwave.\n\nYes, there are infrared lasers, I think they\'re fairly common, actually.\n\nI\'m not aware of any radio lasers. The core problem would be finding a\nsubstance with the proper band structure so as to emit/absorb a photon\nat the specified radio frequency. However, those are low-energy\ntransitions and I think (I\'m not at all sure, but it seems likely) that\nthese transitions may well lose their energy more through mechanical\nthan radiative means (phonons, heat rather than light). Of course, you\nneed to emit light to make a laser go. :)\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>alistair wrote:
> Are there any masers that amplify signals in the infrared region of
> the electromagnetic spectrum or in the radio wave frequency region?
> If not, how could I make one?
Masers are just lasers in the microwave.
Yes, there are infrared lasers, I think they're fairly common, actually.
I'm not aware of any radio lasers. The core problem would be finding a
substance with the proper band structure so as to emit/absorb a photon
at the specified radio frequency. However, those are low-energy
transitions and I think (I'm not at all sure, but it seems likely) that
these transitions may well lose their energy more through mechanical
than radiative means (phonons, heat rather than light). Of course, you
need to emit light to make a laser go. :)
alistair
May24-04, 10:52 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\nGiuseppe Verde <someuser@someplace-that-is-completely-invalid.com> wrote in message news:<c8oldt\\$696\\$1@news.netins.net>...\n> alistair wrote:\n> I\'m not aware of any radio lasers. The core problem would be finding a\n> substance with the proper band structure so as to emit/absorb a photon\n> at the specified radio frequency. However, those are low-energy\n> transitions and I think (I\'m not at all sure, but it seems likely) that\n> these transitions may well lose their energy more through mechanical\n> than radiative means (phonons, heat rather than light). Of course, you\n> need to emit light to make a laser go. :)\n\nMasers work because molecules with rotating electric dipoles can be\nstimulated by incoherent photons to emit an amplified signal of\ncoherent photons.\nThe microwave background of the cosmos consists of incoherent\nmicrowave photons that we only became aware of because of masers.But\nwhat if there are\nother backgrounds of incoherent photons in the radio frequency\nregion.Without a radio frequency maser we could remain ignorant of\nthem.\nHas any work been done to detect incoherent radio waves in the cosmos\nwithout masers?\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>Giuseppe Verde <someuser@someplace-that-is-completely-invalid.com> wrote in message news:<c8oldt$696$1@news.netins.net>...
> alistair wrote:
> I'm not aware of any radio lasers. The core problem would be finding a
> substance with the proper band structure so as to emit/absorb a photon
> at the specified radio frequency. However, those are low-energy
> transitions and I think (I'm not at all sure, but it seems likely) that
> these transitions may well lose their energy more through mechanical
> than radiative means (phonons, heat rather than light). Of course, you
> need to emit light to make a laser go. :)
Masers work because molecules with rotating electric dipoles can be
stimulated by incoherent photons to emit an amplified signal of
coherent photons.
The microwave background of the cosmos consists of incoherent
microwave photons that we only became aware of because of masers.But
what if there are
other backgrounds of incoherent photons in the radio frequency
region.Without a radio frequency maser we could remain ignorant of
them.
Has any work been done to detect incoherent radio waves in the cosmos
without masers?
Mike Crowe
May25-04, 01:31 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>"Giuseppe Verde" <someuser@someplace-that-is-completely-invalid.com> wrote\nin message news:c8oldt\\$696\\$1@news.netins.net...\n>\n>\n> alistair wrote:\n> > Are there any masers that amplify signals in the infrared region of\n> > the electromagnetic spectrum or in the radio wave frequency region?\n> > If not, how could I make one?\n>\n> Masers are just lasers in the microwave.\n>\n> Yes, there are infrared lasers, I think they\'re fairly common, actually.\n>\n\nDepends on where abouts in infrared you are, "normal" lasers can\'t go to\nvery long wavelengths reliably, so can only do the high end of the IR\nspectrum, which are indeed fairly common. Maser\'s on the otherhand\ncannot really get into the IR wavelength, which leaves a large gap in\nthe THz region, these laser are not at all common, and are an important\npart of research since they would allow all kinds of new imaging\nprocedures, particularly of use in medicin. The main way these IR lasers\nare made is by quantum cascade, since there are no known materials that\ncan be used that have the right band structure.\n\nMike Crowe\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>"Giuseppe Verde" <someuser@someplace-that-is-completely-invalid.com> wrote
in message news:c8oldt$696$1@news.netins.net...
>
>
> alistair wrote:
> > Are there any masers that amplify signals in the infrared region of
> > the electromagnetic spectrum or in the radio wave frequency region?
> > If not, how could I make one?
>
> Masers are just lasers in the microwave.
>
> Yes, there are infrared lasers, I think they're fairly common, actually.
>
Depends on where abouts in infrared you are, "normal" lasers can't go to
very long wavelengths reliably, so can only do the high end of the IR
spectrum, which are indeed fairly common. Maser's on the otherhand
cannot really get into the IR wavelength, which leaves a large gap in
the THz region, these laser are not at all common, and are an important
part of research since they would allow all kinds of new imaging
procedures, particularly of use in medicin. The main way these IR lasers
are made is by quantum cascade, since there are no known materials that
can be used that have the right band structure.
Mike Crowe
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