lasergal
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- Apr 20, 2012
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Sorry if this has been discussed elsewhere, but I searched and Googled and still can't find a satisfactory answer, and this question has nagged me for years:
If one of the chief characteristics of laser light is its coherence, why then are the beams from diode lasers any less coherent than from other types of lasers? I've read that diode coherence is inferior to, say, a HeNe so many times I stopped counting. But never have I found a really good explanation for this.
Diode lasers are still real lasers, right? So why do they need special lenses to focus the beam into a tight line, and other lasers don't? :thinking:
Could someone explain it to me so even my "typical female" mind can understand? I'd appreciate it!
And I do apologize if I'm :horse:
If one of the chief characteristics of laser light is its coherence, why then are the beams from diode lasers any less coherent than from other types of lasers? I've read that diode coherence is inferior to, say, a HeNe so many times I stopped counting. But never have I found a really good explanation for this.
Diode lasers are still real lasers, right? So why do they need special lenses to focus the beam into a tight line, and other lasers don't? :thinking:
Could someone explain it to me so even my "typical female" mind can understand? I'd appreciate it!
And I do apologize if I'm :horse: