Old 01-13-2017, 07:21 AM #1
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Default Why are blue lasers much higher output than green lasers ?

Why are blue lasers much higher output than green lasers ?

Green seem to have max output of around 1 watt while blue seems to be max output of around 7 watts ?


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Old 01-13-2017, 09:30 AM #2
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Default Re: Why are blue lasers much higher output than green lasers ?

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Old 01-13-2017, 09:35 AM #3
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Default Re: Why are blue lasers much higher output than green lasers ?

Could you put that into layman's terms ?
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Old 01-13-2017, 09:40 AM #4
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Default Re: Why are blue lasers much higher output than green lasers ?

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Originally Posted by Accutronitis View Post
Could you put that into layman's terms ?
energy is inversely proportional to wavelength. the higher the wavelength, the lower the energy
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Old 01-13-2017, 01:50 PM #5
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Default Re: Why are blue lasers much higher output than green lasers ?

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Originally Posted by HydroSean View Post
energy is inversely proportional to wavelength. the higher the wavelength, the lower the energy
I see, Thanks......
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Old 01-13-2017, 02:45 PM #6
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Default Re: Why are blue lasers much higher output than green lasers ?

Quote:
Originally Posted by HydroSean View Post
energy is inversely proportional to wavelength. the higher the wavelength, the lower the energy
Quote:
Originally Posted by Accutronitis View Post
I see, Thanks......

That's not the reason though. It has nothing to do with it. 1W is 1W is 1W. 1W of 520nm is the same as 1W of 445nm, it's just that the 445nm needs to emit less photons to achieve that 1W output as each photon has more energy.

Differences in available materials as well as demand.

For pointers, DPSS is difficult to get up past 1W in that form factor, just the way DPSS works. You need active temperature control, more optics, lots of pump power etc. Hard to do in a small form factor. I've been around 532nm green lasers that are doing >40W average and a few kWs peak, but that took ~300lbs of cooling equipment, electronics and optical components to achieve. That said, those powers can be achieved much more efficiently and in much smaller form factors with modern technology.

For 520nm diode lasers, the technology is newer, it's had less time to develop. There may also be less demand for more powerful 520nm diodes. For displays you need less green power anyway as it's already a lot brighter than blue, so you may need say 4W of 445nm to match 1W of 520nm. Thus, no large scale demand for direct diode green more than a watt or so.
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Old 01-13-2017, 02:48 PM #7
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Default Re: Why are blue lasers much higher output than green lasers ?

For a single photon, yes, energy is directly proportional to frequency. Though, I'd imagine the total output is much more affected by efficiencies in diode technology.

Edit: Diachi beat me to the explaination and gave a more thorough one.
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Old 01-13-2017, 02:55 PM #8
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Default Re: Why are blue lasers much higher output than green lasers ?

Quote:
Originally Posted by HydroSean View Post
Quote:
Originally Posted by HydroSean View Post
energy is inversely proportional to wavelength. the higher the wavelength, the lower the energy
Setting aside you being incorrect, you should have known that first post wasn't helpful.
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Old 01-13-2017, 03:14 PM #9
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Default Re: Why are blue lasers much higher output than green lasers ?

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Originally Posted by diachi View Post
That's not the reason though. It has nothing to do with it. 1W is 1W is 1W. 1W of 520nm is the same as 1W of 445nm, it's just that the 445nm needs to emit less photons to achieve that 1W output as each photon has more energy.

Differences in available materials as well as demand.

For pointers, DPSS is difficult to get up past 1W in that form factor, just the way DPSS works. You need active temperature control, more optics, lots of pump power etc. Hard to do in a small form factor. I've been around 532nm green lasers that are doing >40W average and a few kWs peak, but that took ~300lbs of cooling equipment, electronics and optical components to achieve. That said, those powers can be achieved much more efficiently and in much smaller form factors with modern technology.

For 520nm diode lasers, the technology is newer, it's had less time to develop. There may also be less demand for more powerful 520nm diodes. For displays you need less green power anyway as it's already a lot brighter than blue, so you may need say 4W of 445nm to match 1W of 520nm. Thus, no large scale demand for direct diode green more than a watt or so.
Thanks ! That makes perfect sense !
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Old 01-13-2017, 04:44 PM #10
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Default Re: Why are blue lasers much higher output than green lasers ?

Just to add a bit more on the diode laser side, the power levels mostly have to do with the properties of available semiconductor materials.

Every color of diode laser uses a different type of semiconductor to achieve a bandgap (energy difference) equivalent to its wavelength of light. Some of these semiconductors are just much more efficient than others.

Coming up with new wavelengths and dramatically improving efficiencies requires discovering new semiconductors or using novel techniques to change the quantum properties of lasing cavities.
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Old 01-16-2017, 12:59 AM #11
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Default Re: Why are blue lasers much higher output than green lasers ?

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Originally Posted by diachi View Post
That's not the reason though. It has nothing to do with it. 1W is 1W is 1W. 1W of 520nm is the same as 1W of 445nm, it's just that the 445nm needs to emit less photons to achieve that 1W output as each photon has more energy.

Differences in available materials as well as demand.

For pointers, DPSS is difficult to get up past 1W in that form factor, just the way DPSS works. You need active temperature control, more optics, lots of pump power etc. Hard to do in a small form factor. I've been around 532nm green lasers that are doing >40W average and a few kWs peak, but that took ~300lbs of cooling equipment, electronics and optical components to achieve. That said, those powers can be achieved much more efficiently and in much smaller form factors with modern technology.

For 520nm diode lasers, the technology is newer, it's had less time to develop. There may also be less demand for more powerful 520nm diodes. For displays you need less green power anyway as it's already a lot brighter than blue, so you may need say 4W of 445nm to match 1W of 520nm. Thus, no large scale demand for direct diode green more than a watt or so.
Yeah I forgot to include an explanation about the DPSS green lasers and that is totally true. But for just single diode InGaN lasers the reason is still due to Debroglie's law since these InGaN blue and green diodes use the same semiconductor dopants.

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Old 01-16-2017, 02:48 AM #12
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Default Re: Why are blue lasers much higher output than green lasers ?

There are many different laser technologies. The two that are used in pointers are DPSS and Direct diode.
You can read up on the differences between DPSS and Diode laser technology here: https://en.wikipedia.org/wiki/Laser_pointer and here: https://en.wikipedia.org/wiki/Diode-...id-state_laser and here: https://en.wikipedia.org/wiki/Diode_laser

If you are meaning by green 532nm green, 532nm green is only created by a DPSS process which is a much more expensive and complicated technology, requiring hand work and fine tuning and has better quality beam than low cost diode lasers. A 700mW 532nm from either laserbtb or jetlasers cost aprox $700 -- $1 per mW. So demand is small due to the expense. A DPSS laser is not something a hobbyist can build generally . 532nm green is so many times brighter to the eye than blue there is little if any call for anything more powerful than 1W as others have said. A 1w 532nm is much brighter than a 7W 445 see: http://lsrtools.1apps.com/relativebr...useRaleigh=off

Low cost mass produced direct diode lasers are much more affordable beause of the many products they are used in where the quality of the laser output does not really matter much. Since the development of direct diode 520nm green it has become popular due to low cost and availability as well. Hobbyist can easily make a pointer containing a direct diode laser---so they are the hobby for the most part.

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