Talk:Laser diode

message: What is the difference between an LED and a laser diode?  —Preceding unsigned comment added by 64.246.146.251 (talk) 23:36, 18 July 2008 (UTC)
replies: text: phase coherence, is the difference between laser and normal light.  At lower current/voltage, most laser diodes function as an LED until the 'lasing' happens.  Phase coherence means all the light is in 'phase' so for the same amount of photons, the peak energy is bigger.  It gives laser light many special properties. See: Coherence (physics).  It probably should be in the intro, so great point. 184.144.115.253 (talk) 23:07, 28 February 2022 (UTC)
thread_title:  LED versus laser diode 

message: Regarding the visible light micrograph, I believe the picture is actually of a photodiode and not the actual laser diode.
Here's a picture of a red laser diode, taken from one of several cheap laser modules I have:
http://i51.tinypic.com/wheik7.jpg
Here you can see something that looks to me a lot like what that picture shows, and I'm fairly certain is a photodiode used for feedback.
http://i56.tinypic.com/2mi3hig.jpg
Here's the diode in operation, with the laser diode clearly visible as the sandwich in the front.  
(Moved from the file discussion page, got no response there)  —Preceding unsigned comment added by 67.204.164.5 (talk) 09:35, 28 December 2010 (UTC)
thread_title: Laser Diode Photo #3

message: With the advent of BluRay and HD DVDs there is a need for multi-wavelength diode lasers to read/write not only these discs but also red DVD and IR CDs. I think these are for now hybrid modules with multiple laser diodes and detectors on an optical pick-up. While these are magnificent examples of miniaturisation they are delicate and yields muct be low. Anyone have any info on what the industry is doing about this?
I am sure they will ultimately be monolithically integrated but this is a tall order given how dissimilar the laser structures are. This may be a stumbling block for the expansion of the HD DVD market IMO.
Royzee 12:36, 1 February 2007 (UTC)
thread_title: Multi-wavelength Diode Lasers

message: We need figures for voltage, current, watts, lumens, and lumens per watt for typical devices.-69.87.203.48 20:53, 19 May 2007 (UTC)
replies: text: And general numbers too, like "up to 50% of the electricity used will be converted to laser light". I know that the high power laser at the bottom of the page, which is from a NIF-offshoot project, is about 12% and is expected to scale to 20% in the short term. That's about the only number I've seen though. Maury 01:36, 11 October 2007 (UTC)
replies: text:  Yes, I came looking for limitations of laser diode versus some of the higher power lasers. CO2 and crystal lasers are for class 4 applications like laser cutting.  I don't think a laser diode can be used for those applications. 184.144.115.253 (talk) 23:14, 28 February 2022 (UTC)
thread_title:  Efficiency 

message: *Oppose - this article (laser diode) is already reaching the point where if it gets any larger, it should be split into sub-articles. The DFB article could stand expansion, with the current small paragraph here pointing to it. --Bob Mellish 17:13, 30 November 2007 (UTC)
thread_title: Merge from [[Distributed feedback laser]]

message: This article, particularly the three photos at the top right, are of excellent encyclopaedic value.  I suggest we promote this idea for more articles. --Wierdy1024 (talk) 15:07, 28 July 2009 (UTC)
thread_title:  1st class article 

message: A paragraph in the article currently states that "As charge injection is a distinguishing feature of diode lasers as compared to all other lasers, diode lasers are traditionally and more formally called "injection lasers." (This terminology differentiates diode lasers, e.g., from flashlamp-pumped solid state lasers, such as the ruby laser. Interestingly, whereas the term "solid-state" was extremely apt in differentiating 1950s-era semiconductor electronics from earlier generations of vacuum electronics, it would not have been adequate to convey unambiguously the unique characteristics defining 1960s-era semiconductor lasers.)" However, these statements are false or misleading, as: 
1) diode lasers can (in some cases) be optically pumped; they are not all charge-injected. 
2) diode lasers are, in fact, distinguished from solid state lasers, by designating diode lasers as semiconductor lasers. The curricula under which I received my AAS in Laser Electro-Optic Technology so distinguishes between the two types of lasers. So, a ruby laser is a solid state laser, but a laser diode is a semiconductor laser. 
Sam's Laser FAQs has a useful reference: http://www.repairfaq.org/sam/laserdio.htm#dioopsl Pooua (talk) 09:38, 30 August 2010 (UTC)
thread_title:  Distinguishing Crystalline Lasers 

message: Folks:
Is it at all reasonable for an article to mention places where a hobbyist can get really low power laser diodes (under 100 microwatts)? I am a led jewelry artist and I am having trouble finding a source of very low power laser diodes.Allyn (talk) 05:34, 30 October 2011 (UTC)
thread_title:  Mention of where hobbyist can get low power laser diodes 

message: This article currently states:
* 635 nm – AlGaInP better red laser pointers, same power subjectively 5 times as bright as 670 nm one
* 640 nm – High brightness red DPSS laser pointers
* 657 nm – AlGaInP DVD drives, laser pointers
* 670 nm – AlGaInP cheap red laser pointers
There are no cheap laser pointers at or near 670 nm. There are only expensive 671nm DPSS laser pointers in the $500 - $4000 price range (Dragon Lasers, Laserglow). Cheap red laser pointers are nominally 650nm (actual 653-4) (spectra of red lasers, eBay). The part about 635 being five times as bright as 670 should be changed to a comparison between 635 and the nominal 650 of common cheap laser pointers, maybe with something in parentheses for actual rather than nominal wavelengths (chart of scotopic spectral sensitivity curve CIE 1978). Zyxwv99 (talk) 13:19, 15 June 2013 (UTC)
replies: text: Agree. WP:SOFIXIT. SBHarris 18:48, 15 June 2013 (UTC)
thread_title:  corrections needed in Common Wavelengths 

message: The opening paragraph needs more descriptive information. Please take a look at the intro to the LED article, which has a lot more info.--Wyn.junior (talk) 13:16, 11 January 2014 (UTC)
thread_title:  Opening paragraph 

message: The Uses section of this article needs work. It needs headings or some bold for the individual uses. Someone should be able to skim the article and know what the uses are without actually reading it.--Wyn.junior (talk) 13:43, 11 January 2014 (UTC)
thread_title:  Uses section 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: The section's a bit dense and contains too many different aspects of the functioning of a Laser diode. Also As detail and attention is given to a double-hetero structure laser diode, it seems that the fact a mono(or homo) structure laser is also just as significant, not necessarily in use, but as principle of operation. Thoughts?
I propose breaking up the section at least into two parts, one where the lasing of a laser diode is given detail, and then the principle behind the pumping process.
Ivangiesen (talk) 17:05, 14 February 2019 (UTC)
thread_title:  Lengthy Theory of Concept 

message: How exactly is the beam generated within a hetero-structure laser diode reflected off certain layers. I think a visual would elucidate the principle on which this works. Something to do with a varying refraction index values for each layer. Not sure on the specifics, but maybe this will jumpstart someone with more knowledge than myself.
Ivangiesen (talk) 17:18, 14 February 2019 (UTC)
thread_title:  Lasing within Heterostructure