PHR803 give me low mW

[gregorio87]

Hi to all!
I have made a bly-ray handheld laser looks like "Pocket pal" model of Jayrob.
I have Used a 803 diode and a FlexDrive.
I have regulated the pot to the maxium value, (in low range) then I think to give it 110 mA.
But I have measure the output power by my Coherent Lasercheck, and it say me only 43,7 mW.
Anyone knows why or has my same problem?
I have read of blu-ray with output of 115mW...

Gregorio

 

[lazerguy]

I think I heard that the Lasercheck has trouble measuring this wavelength. It can't read it very well. That must be the problem, because a 803 diode att 110mA will giveyou at least 80mw, if not more. If you don't have access to a LPM that can read this wavelength, then I suggest you estimate the power of it instead. Test this by pointing the unfocused (about 5mm diameter) beam on your skin. If you can feel a burning sensation in about a second, then it should be about 100mw. My 803 blu-ray is just above 100mw, and that's how it is for me.

If it doesn't burn that much, then I have no idea about what's going on with your diode. The only thing I can think about is that it's a very bad diode.

 

[gregorio87]

Yes, I have already tested it on my skin, and I feel the burning sensation.
I have set my Lasercheck to 405nm, because first of all measurement, it has to be set for the waveleight that you'll go to measure.
Its range is 400-1064nm, but maybe you are right... I have to buy a LaserBee
I have read in the post of IgorT where he sell his blu-ray laser that his at just 110mA pull out 115mW...

Thanks

 

[brtaman]

Correct me if I am wrong, but doesn't the photo sensor of the lasercheck have some issues with the 405nm wavelenght, i remember reading about something, I am not positive that it pertains to the lasercheck though.

Otherwise there is always the chance that u got the most ineficient 803t ever. However, are you sure that the flexdrive is putting out 110nm, (dont have a flexdrive, yet), but most tiny pots that I have handled had an infinte turn radius, they did not have endpoints, but since i dont own a fledrive I really can't say.

Why not set the current up with a testload couple diodes and a 1ohm R+DMM, or a rckstr test load. That way you will be sure of what current you are feeding your diode. You will need one sooner or later in this hobby

 

[lazerguy]

Then your laser should be absolutley all right. I think I'm right about the Lasercheck, because other people have had problems with measuring the blu on it.

brtaman: your flexdrive puts out short UV light? :-? : ;D

 

[daguin]

Then your laser should be absolutley all right. I think I'm right about the Lasercheck, because other people have had problems with measuring the blu on it.

I didn't think that the Lasercheck had a setting for 405nm.  I thought the closest it had was a setting for 473nm.  The way I understand it is, you not only have to "set" the Lasercheck at 473nm, you also then need to multiply the results by a factor of somewhere between 1.75 ans 2.6.  We are just beginning to run a comparative meter test here in the group to determine what the correct factor to multiply the results by is.

In any event, if you use the most conservative factor to multiply your reading by (1.75) your 43.7 becomes a real output of 76.5mW.  Since you can "burn" your skin with the laser, I would guess that the laser is putting out at least that much.  If the Lasercheck now has a 405nm setting, then we must start over figuring out the correct multiplying factor from the new setting.

The Lasercheck (like all "optical" power meters) may have another problem with the blu-ray diodes.  We are finding that there is a fairly significant variability in the wavelength of these diodes.  Since 405nm is so close to the edge of our ability to "see", if the wavelength is 412nm it is much brighter "looking" than 400nm.  I have an 70mW blu-ray that is visually brighter than one of my 170mW blu-rays!  If the wavelength of the diode varies that much what wavelength your particular diode is putting out will change what multiplying factor you should use.  The multiplying factor for 400nm is not the same as the multiplying factor for 412nm.

The bottom line here is that

1)  The Lasercheck has proven to have some issues with blu-ray wavelengths.
2)  You must multiply your reading by a factor of 1.75-2.6
3)  The particular wavelength of YOUR particular diode could effect the results
4)  I think that your laser is fine.  Your meter is the problem

Peace,
dave

 

[brtaman]

Then your laser should be absolutley all right. I think I'm right about the Lasercheck, because other people have had problems with measuring the blu on it.

brtaman: your flexdrive puts out short UV light? :-? : ;D

Hehe yes, I have a very special flexdrive, it can also be used as a particle accelerator, a wormhole catalyst and...a cappuccino machine ;D

LOL, i guess I have just been typing and thinking in ma, mw and nm so much that they have started to taken on a shared associations not good, not good :-/

 

[lazerguy]

[quote author=LazerGuy link=1220703071/0#4 date=1220705729]Then your laser should be absolutley all right. I think I'm right about the Lasercheck, because other people have had problems with measuring the blu on it.

brtaman: your flexdrive puts out short UV light? :-? : ;D

Hehe yes, I have a very special flexdrive, it can also be used as a particle accelerator, a wormhole catalyst and...a cappuccino machine ;D

LOL, i guess I have just been typing and thinking in ma, mw and nm so much that they have started to taken on a shared associations not good, not good  :-/[/quote]

Hehe, maybe it's not good, but it certainly was funny this time!

 

[scopeguy20]

[highlight]"We are just beginning to run a comparative meter test here in the group to determine what the correct factor to multiply the results by is."[/highlight]

Hey Dave, is the Calibration kit with you yet?

 

[daguin]

[highlight]"We are just beginning to run a comparative meter test here in the group to determine what the correct factor to multiply the results by is."[/highlight]

Hey Dave, is the Calibration kit with you yet?

No. Pseudo is having some problem with the PSU I think.

Peace,
dave

 

[laserguys]

[quote author=LazerGuy link=1220703071/0#4 date=1220705729]Then your laser should be absolutley all right. I think I'm right about the Lasercheck, because other people have had problems with measuring the blu on it.

I didn't think that the Lasercheck had a setting for 405nm. I thought the closest it had was a setting for 473nm. The way I understand it is, you not only have to "set" the Lasercheck at 473nm, you also then need to multiply the results by a factor of somewhere between 1.75 ans 2.6. We are just beginning to run a comparative meter test here in the group to determine what the correct factor to multiply the results by is.

In any event, if you use the most conservative factor to multiply your reading by (1.75) your 43.7 becomes a real output of 76.5mW. Since you can "burn" your skin with the laser, I would guess that the laser is putting out at least that much. If the Lasercheck now has a 405nm setting, then we must start over figuring out the correct multiplying factor from the new setting.

The Lasercheck (like all "optical" power meters) may have another problem with the blu-ray diodes. We are finding that there is a fairly significant variability in the wavelength of these diodes. Since 405nm is so close to the edge of our ability to "see", if the wavelength is 412nm it is much brighter "looking" than 400nm. I have an 70mW blu-ray that is visually brighter than one of my 170mW blu-rays! If the wavelength of the diode varies that much what wavelength your particular diode is putting out will change what multiplying factor you should use. The multiplying factor for 400nm is not the same as the multiplying factor for 412nm.

The bottom line here is that

1) The Lasercheck has proven to have some issues with blu-ray wavelengths.
2) You must multiply your reading by a factor of 1.75-2.6
3) The particular wavelength of YOUR particular diode could effect the results
4) I think that your laser is fine. Your meter is the problem

Peace,
dave[/quote]

Dave,
I think you are referring to the LPM-1 optical LPM that is only calibrated down to 473nm
and it requires you to multiply a correction factor with the reading for 405nm.
The LaserCheck does go down to a 400nm wavelength adjustment and it calculates the optical
correction factor in the on board MCU. You don't need to multiply anything with the LaserCheck.

EDIT:
But I agree, the LaserCheck does have some issues at the extremes of its Max/Min ranges.

 

[gregorio87]

Correct me if I am wrong, but doesn't the photo sensor of the lasercheck have some issues with the 405nm wavelenght, i remember reading about something, I am not positive that it pertains to the lasercheck though.

Otherwise there is always the chance that u got the most ineficient 803t ever. However, are you sure that the flexdrive is putting out 110nm, (dont have a flexdrive, yet), but most tiny pots that I have handled had an infinte turn radius, they did not have endpoints,  but since i dont own a fledrive I really can't say.

Why not set the current up with a testload  couple diodes and a 1ohm R+DMM, or a rckstr test load. That way you will be sure of what current you are feeding your diode. You will need one sooner or later in this hobby  

The pot of the FlexDrive is "infinite turn" but when you arrive at the endpoint, it come back to the minium resistance.
When you see that the laser dot is much visible, and with a little movement it will be few visible, then you are at the end point of the pot.
The low range (without soldering the bridge on the two points) of the flexdrive put out 64 - 110 mA, the high range put out 125 - 500 mA

 

[gregorio87]

I didn't think that the Lasercheck had a setting for 405nm..................

Peace,
dave

Maybe you are right. In the data sheet of the LaserCheck there is write that it has a wl range from 400 to 1064 nm, but maybe it can make an error in the initial wl and in the final (I haven't any nd:yag to test 1064 nm).
The only test that I am sure with LaserCheck is in the 532 nm wl.

When I have money, I want to buy a thermal meter, such as the LaserBee for its good price and its function to hook it to the computer to logging data.


Thanks to all for the answers


Gregorio