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Old 07-08-2010, 12:01 AM #1
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Default Need help with a bad beam profile/divergence

So I have my first build under my belt. I went with a Jayrob chrome mini, Jayrob glass lens mod, copper H/S and "EZ" focus adapter. (I'll post my review soon. I finished it up, inserted the battery and held my breathe... Success! I couldn't be happier that it actually turned on. My only problem is the beam profile and divergence is terrible. It has a center "dot" with aproximately 6 perfectly spaced surrounding dots. At the other end of my yard the center dot is "red". I was told possibly this is due to the LD not being squarely pressed or the window is dislodged. I have Flamin Pyro's insertion and extraction tools. I pressed the diode in with it and double checked the alignment with the extraction tool. Looks good. Lens is clean, window is clean and visibly "looks" ok. Anyone have any ideas before I either attempt to "decan" my LD, or spend the money on another one? Thanks, in advance.

P.S. I'll try and get a pic added. My iphone isn't exactly great at this


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445nm Diode in a DIY 18650 S/S Flaminpyro host @ 1.1 amps measured @ 987mW
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532nm Jet Lasers PL-D 500
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Old 07-08-2010, 12:00 PM #2
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Default Re: Need help with a bad beam profile/divergence

Wow, this sounds really weird...

Pleae do post some more pictures, but from the sound of it, you are shining it into diffraction grating

Just kidding.

But on serious note, what color is the laser actually, you've never mentioned that except that "center" dot is red , which , considering the context, is weird...

What do you mean?
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Old 07-08-2010, 03:58 PM #3
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Default Re: Need help with a bad beam profile/divergence

Quote:
Originally Posted by Eudaimonium View Post
Wow, this sounds really weird...

Pleae do post some more pictures, but from the sound of it, you are shining it into diffraction grating

Just kidding.

But on serious note, what color is the laser actually, you've never mentioned that except that "center" dot is red , which , considering the context, is weird...

What do you mean?
Oops. Minor details It's a GGW 405nm. And yes, it does almost look like a diffraction grating. It has a pattern like a revolver cylinder, with a perfectly centered dot in the middle. The outside dots are violet and at distance, the center dot looks a little purpley red. Dunno? I tried switching out lens assy's and flipping lens around. Same pattern every time.
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405nm 6X in a DIY Jayrob chrome mini w/G1 and copper H/S measured @ 238mW
405nm Jet Lasers PL-C 800 measured @ 800mW
445nm Diode in a DIY 18650 S/S Flaminpyro host @ 1.1 amps measured @ 987mW
445nm W/L Spyder III Arctic measured @ 743mW
532nm Jet Lasers PL-C 500 measured @ 659mW
532nm Jet Lasers PL-D 500
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532nm W/L E2 (X2) measured @ 85 & 97mW
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Old 07-08-2010, 04:03 PM #4
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Default Re: Need help with a bad beam profile/divergence

Quote:
Originally Posted by CDHDC View Post
Oops. Minor details It's a GGW 405nm. And yes, it does almost look like a diffraction grating. It has a pattern like a revolver cylinder, with a perfectly centered dot in the middle. The outside dots are violet and at distance, the center dot looks a little purpley red. Dunno? I tried switching out lens assy's and flipping lens around. Same pattern every time.
You know, I also saw that when shining bluray on grass, sometimes the dot appears redish pinkish violetish - like , because of some grass flourescing properties of something.

But, never mind that, the perfectly diffractioned beams look weird, however if you tried changing lens and same thing happens... I am afraid... that the little glass window on your diode is broken.

Please take a closer look at your diode and see.
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Old 07-08-2010, 06:29 PM #5
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Default Re: Need help with a bad beam profile/divergence

Quote:
Originally Posted by Eudaimonium View Post
You know, I also saw that when shining bluray on grass, sometimes the dot appears redish pinkish violetish - like , because of some grass flourescing properties of something.

But, never mind that, the perfectly diffractioned beams look weird, however if you tried changing lens and same thing happens... I am afraid... that the little glass window on your diode is broken.

Please take a closer look at your diode and see.
Thanks, I figured as much. I just wanted someone elses opinion before have at that poor little diode
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405nm 6X in a DIY Jayrob chrome mini w/G1 and copper H/S measured @ 238mW
405nm Jet Lasers PL-C 800 measured @ 800mW
445nm Diode in a DIY 18650 S/S Flaminpyro host @ 1.1 amps measured @ 987mW
445nm W/L Spyder III Arctic measured @ 743mW
532nm Jet Lasers PL-C 500 measured @ 659mW
532nm Jet Lasers PL-D 500
532nm 5mW pointer
532nm W/L E2 (X2) measured @ 85 & 97mW
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Old 07-08-2010, 06:32 PM #6
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Default Re: Need help with a bad beam profile/divergence

On a side note, it is rather cool looking. I'll do what I can with my limited photog skills and equipment to get some pics before I fix/kill it
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405nm 5mW pointer (X2)
405nm 6X in a DIY Jayrob chrome mini w/G1 and copper H/S measured @ 238mW
405nm Jet Lasers PL-C 800 measured @ 800mW
445nm Diode in a DIY 18650 S/S Flaminpyro host @ 1.1 amps measured @ 987mW
445nm W/L Spyder III Arctic measured @ 743mW
532nm Jet Lasers PL-C 500 measured @ 659mW
532nm Jet Lasers PL-D 500
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532nm W/L E2 (X2) measured @ 85 & 97mW
532nm Jet Lasers Ti-B 100mW
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Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






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