Old 10-11-2017, 04:58 AM #1
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Default Sharp 638nm 185mW Pen

My collection is filling out now.
The latest installment is another chrome pen fitted with the Sharp GH0631IA2G 638nm 185mW diode.
The other two pens I have now are built with 462nm and 505nm diodes.
The threads for those builds are here:
505nm Leadlight
Pen Tutorial with 462nm diode

One note on the build:
I didn't know this diode lacks a case pin until it arrived. Case neutral diodes are usually great because I can solder the case pin to the negative pin to effectively make it case negative. I couldn't do that with this diode, so I cut the pin off an old, dead diode, crammed it into one of the notches in the diode case and soldered a lead from the driver negative input to my "case pin." I epoxied the pin in place for security but it probably wasn't necessary considering how good the fit was. See the first photo.

This is my new favorite laser.
Red diodes are efficient and, at this wavelength, quite bright. The beam characteristics are also very good. This combination of qualities makes a diode like this one well suited for a compact pointer.
The color is beautiful - an orangey-red. The last time I had a 638nm pointer was when a few 40mW diodes appeared.

It's driven conservatively to maximize lifetime and keep the wavelength low. It's powered by a Flexdrive and 2xAAA batteries and has a 650-G lens set for minimum divergence at 15 meters. It can run continuously indefinitely without overheating.

The third photo shows the laser pointed at a chimney 80 meters away in sunlight. It is a bit more noticeable to my eyes than is shown in the picture.
The fifth photo shows the beam width at 50 meters distance. The iPhone SE is used for scale.
In the last two photos, the laser is aimed at a rock more than 800 meters away.
Attached Thumbnails
Sharp 638nm 185mW Pen-dsc05780.jpg   Sharp 638nm 185mW Pen-dsc05786.jpg   Sharp 638nm 185mW Pen-dsc05804.jpg   Sharp 638nm 185mW Pen-dsc05811.jpg   Sharp 638nm 185mW Pen-dsc05818.jpg  

Sharp 638nm 185mW Pen-dsc05824.jpg   Sharp 638nm 185mW Pen-dsc05877.jpg   Sharp 638nm 185mW Pen-dsc05880.jpg  



Last edited by RA_pierce; 10-11-2017 at 04:59 AM. Reason: misspelling
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Old 10-11-2017, 05:07 AM #2
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Default Re: Sharp 638nm 185mW Pen

Nice build, and nice pictures too!

Last edited by diachi; 10-11-2017 at 05:08 AM.
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Old 10-11-2017, 05:18 AM #3
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Default Re: Sharp 638nm 185mW Pen

I really like the picture showing those 3 lasers you have.

-Alex
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Old 10-11-2017, 05:24 AM #4
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Default Re: Sharp 638nm 185mW Pen

very nice set of builds,so you driven conservatively to maximize lifetime but what exactlypower did you chose?

also your beamshots at nice looks awesome.i love red
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Old 10-11-2017, 05:25 AM #5
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Default Re: Sharp 638nm 185mW Pen

Quote:
Originally Posted by deadshadow View Post
.i love red
I like red too. Not so much the orange-red, but red-red. Like 650 red.

-Alex
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Old 10-11-2017, 06:08 AM #6
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Default Re: Sharp 638nm 185mW Pen

Thanks for the photo's, always a treat to have members show us their new stuff/toys. Nothing wrong with 650 nm you can't fix with power but since that costs $ I've only been buying 638 nm orange-red.
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Old 10-11-2017, 03:16 PM #7
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Default Re: Sharp 638nm 185mW Pen

Quote:
Originally Posted by deadshadow View Post
very nice set of builds,so you driven conservatively to maximize lifetime but what exactlypower did you chose?

also your beamshots at nice looks awesome.i love red
I set the driver to 180mA then adjusted current slightly higher until the unfocused beam could just produce a wisp of smoke on black plastic.
I no longer have a power meter so I'm guesstimating output is between 180 and 200mW. The diode's datasheet states that the operating current is 215mA and I think it's being driven at about that current.
I typically set the driver low then adjust as needed to get the output power I want. Not having a power meter makes it more difficult.

It was pretty fun to make those photos. I haven't done that in a while. I may have to find a longer distance to point to and then make a hike out to the beam terminal.

Quote:
Originally Posted by Hap View Post
I really like the picture showing those 3 lasers you have.

-Alex
Thanks! I'd like a couple more interesting wavelengths but it seems I'll have to wait a bit before something new (and affordable) pops up.

Quote:
Originally Posted by diachi View Post
Nice build, and nice pictures too!
Thanks!
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Old 10-11-2017, 04:13 PM #8
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Default Re: Sharp 638nm 185mW Pen

Great looking build, RA, those single mode reds are some of my favorites too; I've always used the Opnext 120mW version from DTR, but they seem to have the same good beam characteristics.
Nice photos, good solid looking beam.
Now that you have your RGB rainbow, what's next on your build agenda?
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Old 10-11-2017, 06:04 PM #9
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Default Re: Sharp 638nm 185mW Pen

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Originally Posted by BowtieGuy View Post
Great looking build, RA, those single mode reds are some of my favorites too; I've always used the Opnext 120mW version from DTR, but they seem to have the same good beam characteristics.
Nice photos, good solid looking beam.
Now that you have your RGB rainbow, what's next on your build agenda?
That's something I haven't decided yet.
I'd like to do something interesting and unique. I've got some ideas for laser-related "accessories" but I have to get back to Rich with the plans before that goes anywhere.

I'm jealous of styropyro's UV build but I don't want to copycat. I'll come up with something...
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Old 10-12-2017, 08:38 AM #10
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Default Re: Sharp 638nm 185mW Pen

Nice these chrome pencils of various colors!

Beautiful building! I hope I can do even one of these days!
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Old 10-12-2017, 02:05 PM #11
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Default Re: Sharp 638nm 185mW Pen

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Nice these chrome pencils of various colors!

Beautiful building! I hope I can do even one of these days!
Welcome back, 3D
If you want to build a pen, check out the tutorial I linked in the first post.
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Old 10-12-2017, 03:36 PM #12
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Default Re: Sharp 638nm 185mW Pen

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Welcome back, 3D
If you want to build a pen, check out the tutorial I linked in the first post.

You're Welcome RA_pierce ,

Thx for the advice up on the build pen post !
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Old 10-12-2017, 05:41 PM #13
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Default Re: Sharp 638nm 185mW Pen

Good job RA_pierce. Very nice.

Welcome back 3D.
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Old 10-13-2017, 07:16 AM #14
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Default Re: Sharp 638nm 185mW Pen

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Originally Posted by CurtisOliver View Post
Good job RA_pierce. Very nice.

Welcome back 3D.

Many Thx Curtis man
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Old 10-19-2017, 04:07 AM #15
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Default Re: Sharp 638nm 185mW Pen

Just saw this thread, very nice build! I've built a nearly identical one, 185mW sharp diode with flexdrive in a leadlight, except mine was the black version. I recently tore it down (in hindsight for nothing) because I thought I needed a flexdrive. I'll have to put it back together.

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Originally Posted by RA_pierce View Post
I'm jealous of styropyro's UV build but I don't want to copycat. I'll come up with something...
Don't be afraid to copycat! The more 375nm builds the better. I definitely want to copycat the 488nm builds out there.
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Old 10-20-2017, 11:31 AM #16
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Default Re: Sharp 638nm 185mW Pen

Nice Pen!! I have a pen host. I don’t know what I want to do with it. I go back and forth. I’d like to do a nice sapphire blue. But, recently I’ve been looking at 660nm LPM-836 and others similar. Cheap diode at that... I dunno. I have three hosts I’m dying to put together. This shyte is a real illness
__________________
405nm BDR-208BK/SL-D-3 515mA/SLC6 -Vio-latile 2
445nm 1W Sanwu Challenger
450nm PLTB450B/1.8A XDrive/Lifetime17 Cu Pen -SacréBLUE
462nm M462/1.8A XDrive/SL stainless-extended - The Blue Job
490nm GH04850B2G/Flexdrive 150mA/Leadlight “The GD Pen is Blue”
507nm GH05030C2LM/Blitz linear 180mA/Leadlight - Silver Mint
520nm PLP520-B1/nano drive 470mA/Microstream -GreenStream
520nm PL520/nano drive275mA/LED keychain/Lifetime17 HS - Chaos
638nm GH0631IA2G/nano drive 275mA/Lifetime17 HS -Red Richard
650nm GGW/Flexdrive 440mA/UltraFire C3/Lifetime17 HS.
-Crimson WaveLength
660nm ML101U29/Flexdrive 340mA/Leadlight - Super Pointer
****TO BE CONTINUED****


~{OBITUARIES}~
•638nm 700mW Oclaro in Stainless SL Host. Passed suddenly while fog lasing. She was only 2 month old. Her heart and host were donated to lend life to an M462 and Sharp 638nm GH0631IA2G.
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