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The statement that electrons are the only charge carrier is ambiguous. Devices have been successfully demonstrated, which exploit intersubband transitions in the valence band. Of course, electron transport is taking place here, but one may refer to the process as hole transport when the majority of electron states in a band are occupied. I think the important point here is that intersubband transitions rather than interband transitions are taking place. - djsik 17:39, 11 March 2006 (UTC)
Although MBE is commonly used, I believe CVD is too. Does anyone know more about this? - djsik 17:39, 11 March 2006 (UTC)
MBE was orginally used most often for the first decade because Alfred Cho, the inventor, was a member of the research group. MBE growth gives much cleaner layers. Interest in MO-CVD growth began relatively recently and has been growing due to the already-in-place industry growth facilities. This would make the industrial production of QCLs cheaper and more feasible.
Responding to this query: It has long been a goal to build QCLs by MOCVD because that makes production much cheaper. I believe a proof of principle has been achieved (I think by HP labs) but it was a very low quality device and it is not clear if this technology will really be made feasible. —Preceding
unsigned comment added by
98.173.26.151 (
talk)
14:54, 14 December 2007 (UTC)
Orignal concept was published by Kazarinov and Suris in 1971 and then realized by the group at Bell Labs. I think the credit of invention should go to the original authors: "Possibility of amplification of electromagnetic waves in a semiconductor with a superlattice",Kazarinov, R.F.; Suris, R.A., Fizika i Tekhnika Poluprovodnikov April 1971, vol.5, no.4, pp. 797-800
There are some nice public domain images over on the Netherlands version of this page ( nl:Kwantumcascadelaser); would anyone care to have a go at incorporating them here? — Catherine\ talk 08:06, 23 February 2007 (UTC)
The equation starting dn1/dt in the section "Operating Principles" is all wrong. It should read dn1/dt = n2/tau21 + n3/tau31 - n1/tau13 - n1tau12 - Iout
All QCLs ever published make use of a waveguide. What is this section supposed to mean? —Preceding unsigned comment added by 192.167.204.12 ( talk) 13:35, 28 November 2007 (UTC)
I don't see any significant educational value for keeping this link in the article. Does anyone see any good reason to include it? It's important to avoid any advertising or promotion of commercial entities. Papa November ( talk) 08:53, 7 May 2011 (UTC)
The statement about 2.75-250 micron "coverage" is misleading... a huge band is missing from the middle of this range (~1-20 THz frequency) owing to Reststrahlen absorption in III-V semiconductors. If anyone has any references handy, please add this. Otherwise, I will try to dig something out. Papa November ( talk) 15:41, 13 January 2012 (UTC)
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Quantum-cascade laser article. This is not a forum for general discussion of the article's subject. |
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The statement that electrons are the only charge carrier is ambiguous. Devices have been successfully demonstrated, which exploit intersubband transitions in the valence band. Of course, electron transport is taking place here, but one may refer to the process as hole transport when the majority of electron states in a band are occupied. I think the important point here is that intersubband transitions rather than interband transitions are taking place. - djsik 17:39, 11 March 2006 (UTC)
Although MBE is commonly used, I believe CVD is too. Does anyone know more about this? - djsik 17:39, 11 March 2006 (UTC)
MBE was orginally used most often for the first decade because Alfred Cho, the inventor, was a member of the research group. MBE growth gives much cleaner layers. Interest in MO-CVD growth began relatively recently and has been growing due to the already-in-place industry growth facilities. This would make the industrial production of QCLs cheaper and more feasible.
Responding to this query: It has long been a goal to build QCLs by MOCVD because that makes production much cheaper. I believe a proof of principle has been achieved (I think by HP labs) but it was a very low quality device and it is not clear if this technology will really be made feasible. —Preceding
unsigned comment added by
98.173.26.151 (
talk)
14:54, 14 December 2007 (UTC)
Orignal concept was published by Kazarinov and Suris in 1971 and then realized by the group at Bell Labs. I think the credit of invention should go to the original authors: "Possibility of amplification of electromagnetic waves in a semiconductor with a superlattice",Kazarinov, R.F.; Suris, R.A., Fizika i Tekhnika Poluprovodnikov April 1971, vol.5, no.4, pp. 797-800
There are some nice public domain images over on the Netherlands version of this page ( nl:Kwantumcascadelaser); would anyone care to have a go at incorporating them here? — Catherine\ talk 08:06, 23 February 2007 (UTC)
The equation starting dn1/dt in the section "Operating Principles" is all wrong. It should read dn1/dt = n2/tau21 + n3/tau31 - n1/tau13 - n1tau12 - Iout
All QCLs ever published make use of a waveguide. What is this section supposed to mean? —Preceding unsigned comment added by 192.167.204.12 ( talk) 13:35, 28 November 2007 (UTC)
I don't see any significant educational value for keeping this link in the article. Does anyone see any good reason to include it? It's important to avoid any advertising or promotion of commercial entities. Papa November ( talk) 08:53, 7 May 2011 (UTC)
The statement about 2.75-250 micron "coverage" is misleading... a huge band is missing from the middle of this range (~1-20 THz frequency) owing to Reststrahlen absorption in III-V semiconductors. If anyone has any references handy, please add this. Otherwise, I will try to dig something out. Papa November ( talk) 15:41, 13 January 2012 (UTC)
Hello fellow Wikipedians,
I have just modified 3 external links on Quantum cascade laser. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
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Cheers.— InternetArchiveBot ( Report bug) 12:42, 21 July 2016 (UTC)