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my sharp GH04850B2G (the chameleon light)

deadshadow

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finally got some time to make a complete thread about the newest diode on our laser world sharp GH04850B2G the chameleon light as i named it because i can't tell what color really is as its always changing on my eyes depending the enviroment and other lights.
i was planning to upload images from the building process but i encountered a problem with my driver and got pissed while i was trying to see what i was doing wrong,problem solved with another driver though at the end but i completelty forgot to take pics while i was trying to make the things work.

also i just hate that light for one reason,it made my 505nm build look nice green and my 520nm to look like 532nm and the 532nm as yellow ,it messed up my brain :p

here is the the host i used,its kinda small and takes one 14500 battery and the diode runs with a astralist's pico drive set at 190ma without heatsinking,i used a kind of big aluminum heatsink with fins as so many of you noted that this diodes runs hot. power is around 75mw with acrylic or 3 element lenses



now for the interesting part that seen many posts about what lens is better for those diodes to get rid of the box reflection,personally after testing both acrylic and 3 element 520nm coating lens i prefer the 2nd choice and here is why:

this is the reflections from acrylic lens


and this is with the 3 element green coating lens


the output power is the same with both lenses +-3mw so power isn't something to worry about.
another thing that i don't like on the acrylic lens is that it does have a fade reflection box still there, here is the photo of it,im blocking the dot with my finger to let my camera pick it better,it is a fader that it look like though.


3 element has a fade relfection of it also but it is barely visible at all.

couple of beamshot of this awesome color.

this is the box reflection with a G2 when i first test it.


those are with 3 element lens beamshots
 

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paul1598419

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I have noticed and also documented that much of the splash from acrylic lenses is only there at very close range and at distances past 10 feet, is mostly caught by the camera and not something you actually see. I have confirmed that the 2 element 520nm AR coated lenses sold by DTR do eliminate the rectangular refection. But, the splash is still there regardless. You can always eliminate it completely by masking the output.

Since I rarely use the lasers at close distances this is not a problem for me. If it bothers you then masking is your only option from the many lenses I have tried.

Since you are seeing some green in yours, I suspect it is in the higher wavelength of these diodes. Around 491nm or above. I like this color a lot. I also like the lower wavelength colors that only look light blue to me. 488nm and below.

I do like your host. It is a nice EDC build with fins on the end. That should help in stabilising the wavelength.

+ Rep. Was just now able to give it to you. :D
 
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RA_pierce

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Cool laser.
I agree with you on the acrylic lenses. However I don't like the artifacts from the 3-element glass lenses either. I prefer to stick with the G-series lenses since they don't spray light out at huge angles.
I should mention that if you are using acrylic or multi-element glass lenses, if you recess the lens deep enough and use a 5mm aperture cap (like the leadlight pens) it will mask the splash and keep the beam intact without clipping.
 
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BowtieGuy

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Good looking EDC sized build you've got there, deadshadow, although with that finned heatsink, you wouldn't want to carry it in your pocket ....ouch! :D
:gj:

Those Sharp diodes really are chamelions, always changing depending on the light and surroundings. :yh:
 

RB astro

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This looks so awesome deadshadow.
Love the finned host and the colour is wonderful.
I agree, chameleon is a good name as it does change and play tricks on you.
+reps for this when I can again for you, since I just repped you for something else this morning. :crackup::beer:

RB
 

deadshadow

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thanks for your opinions everyone, i can't agree more with BowtieGuy that this thing can't fit my pocket :crackup:
 

paul1598419

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If you have a simple focus ring on the lens I'd put a rubber cover over it before putting any laser in your pocket. It helps to keep debris off the lens. I have several of those green colored ones that I use regardless of where it is stored. The ones with custom focus ring I keep in an airtight bag.
 

deadshadow

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If you have a simple focus ring on the lens I'd put a rubber cover over it before putting any laser in your pocket. It helps to keep debris off the lens. I have several of those green colored ones that I use regardless of where it is stored. The ones with custom focus ring I keep in an airtight bag.
i don't have any rubber covers that fit exactly the lens ring but instead if i have to take a laser with me i use a small piece of duct tape on top of the ring and does the job good,well only only one time i forgot to remove it powered my laser and had burned duct tape on the lens,nothing serious as the lens was cheap 3 element though
 

Richie89

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very nice build! I really like that host along with that sink. by the way my PLT5 450B (Lucille bat) build has that same box shape :thinking:
 
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paul1598419

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i don't have any rubber covers that fit exactly the lens ring but instead if i have to take a laser with me i use a small piece of duct tape on top of the ring and does the job good,well only only one time i forgot to remove it powered my laser and had burned duct tape on the lens,nothing serious as the lens was cheap 3 element though
Those green rubber covers aren't made for that purpose. They come when you buy something else and are just useful repurposed as a lens cover. I can't remember exactly what they come with, but I'm sure someone around here remembers.
 
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I use nasal spray covers as a very airtight cover, hilarious I know.

It covers the whole lens and down the threads, eliminating as much air flow as possible.
 

paul1598419

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I used to use nasal spray when I was much younger. Gave it up years ago as it has a tendency to rebound on you making using one necessary to breath through your nose. Wouldn't have any caps now and don't know where I would get them short of buying more nasal spray.
 




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