- Jan 28, 2015
It seems like price/perfomance wise, blue laser beat red and green ones, always wondered this, but why?
Like people above me already said, if there's not enough demand for a certain diode, then it will be produced less. And producing lower quantities results in overall higher costs. The thing with DPSS is that they require precise assembly and aligning. Apart from 532nm there really is not much demand for other wavelengths.well, i understand why they are cheaper than green (DPSS is expensive, and direct diode green is relatively new) but i have no idea as to why diode red isn't as cheap. a 1W red is over 100$ even in the cheapest build you can make (well, for 635/638nm that is), and that's still pushing current diodes/diode technology! meanwhile 1W of blue is 85$ already built, and you can get lasers WAY beyond that for only a little more.
and the weirdest part is that red diodes have been around longer.
yes but why is there more demand for blue? i thought that 405nm purple was used in blu-ray burners and readers, not blue, and thats probably a large source of demand. if blue is being produced for laser projectors, then why isn't red becoming cheaper or available in higher powers?if there's not enough demand for a certain diode, then it will be produced less.
Exactly.High power blue laser diodes are used in projectors, so there is a pretty big market on them. Not so much for other colors. This makes them cheaper
See answer, above, in post # 2yes but why is there more demand for blue? i thought that 405nm purple was used in blu-ray burners and readers, not blue, and thats probably a large source of demand. if blue is being produced for laser projectors, then why isn't red becoming cheaper or available in higher powers?
obviously, DPSS is expensive and i understand why, and diode green is new (new tech is always expensive), but what about red? why isn't red as cheap as blue. is it because of limitations of current diode technology or is it really that old "supply and demand" thing?
the thing i'm wondering about the most is what is blue being used in more than red and green?, and why in such high powers to facilitate its dropping in price.
oh so laser projectors dont have red green and blue diodes, just a blue one? i thought they had a RGB thing going on in there. thank you for the explanation.Exactly.
See answer, above, in post # 2
Blue laser diodes in combination with a converter wheel, which converts part of the blue light into the two primary colors of red and green, are used as the light source for laser projectors.