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Quiz : Guest the wavelength of this red laser.

Blord

Blord

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I am puzzled about the wavelength of this red laser. On the left I have the 200mW red Dilda laser. This laser has a wavelength about 650nm. On the right side is the 40mW 635nm red diode from Ebay. This laser is running little overdriving at 120mA. Both laser have a comparibel brightness, maybe the Dilda has a slight edge.
In the middle is the mysterious red.

Who can give the estimated wavelength and the power of this laser. :shhh:

Left: red dilda, right 40mW 635nm LD and middle: ??
redcolor.jpg
 
Last edited:





Braddubya

Braddubya

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Blord said:
I am puzzled about the wavelength of this red laser. On the left I have the 200mW red Dilda laser. This laser has a wavelength about 650nm. On the right side is the 40mW 635nm red diode from Ebay. This laser is running little overdriving at 120mA. Both laser have a comparibel brightness, maybe the Dilda has a slight edge.
In the middle is the mysterious red.

Who can give the estimated wavelength and the power of this laser. :shhh:

right: red dilda, left 40mW 635nm LD and middle: ??
redcolor.jpg
Click to expand...

Which is which?
 
Braddubya

Braddubya

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Your 200mW is over driven causing it to move up the spectrum vs the 5mW

The 635nm is also driven at its highest range causing it to move towards 650nm. According to its spec sheet its 640nm even at 10mW

So the 200mW is moving away from the 5mW and the 635nm is moving towards
 
midias

midias

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Braddubya said:
Your 200mW is over driven causing it to move up the spectrum vs the 5mW

The 635nm is also driven at its highest range causing it to move towards 650nm. According to its spec sheet its 640nm even at 10mW

So the 200mW is moving away from the 5mW and the 635nm is moving towards
Click to expand...

According to the spec sheet it is ~638nm at 40mw at 20c. If he is driving at 40mw as he claims at ~100 - 110ma he shoudl be right around 638nm at normal room temp.

wavelength.jpg
 
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Braddubya

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Maybe I do not know how to accurately read this graph but

b196351784f00292a88261ca520e31cd2669368f7b5058e9375897af946325a26g.jpg


Doesn't it indicate a wavelength change due to power output even with stable temperature?

Also indicates that its nearly 641nm at 40mW which is getting pretty close to 650nm
 
midias

midias

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Braddubya said:
Maybe I do not know how to accurately read this graph but

b196351784f00292a88261ca520e31cd2669368f7b5058e9375897af946325a26g.jpg


Doesn't it indicate a wavelength change due to power output even with stable temperature?

Also indicates that its nearly 641nm at 40mW which is getting pretty close to 650nm
Click to expand...


That just indicates how intense the beam is IE how bright at different power levels not what the beam actually is at those power levels. Because the diode can become those wavelengths but the typical is 638mw at 40mw at room temp (68F) and approx 639nm at 77F for the typical diode.
 
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