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Old 06-15-2014, 08:06 PM #1
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Talking 650-660nm Mits laser diodes

There is a new red laser diode out there and it is the Mitsubishi LPC-840. It is rated higher than the LPC-836 and should be able to be driven up to 500mW. It is rated for 390mW. They are offered on eBay and the single diode price is a very reasonable $15.01. I ordered one right away. Here is the link: www.ebay.com/itm/11346398051. I already have a couple of LPC-836s, but I am very excited about getting this new red laser diode. Paul

I found another link to the same diode that is a $1.01 cheaper. The link is: New Mitsubishi 650 660nm 390 596mW High Power Red Laser Diodes LPC 840 1 Pcs | eBay. I bought one of these, too.


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Old 06-18-2014, 03:28 AM #2
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Default Re: 650-660nm Mits laser diodes

Might have been easier to put this in the deals section but no matter, nice find! I wonder how the beam specs on these are. I cannot yet find a datasheet for them. When I find one I may have to buy some.
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Old 06-18-2014, 04:25 AM #3
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Default Re: 650-660nm Mits laser diodes

They are supposed to be driven under 390mA and output 50mW higher than the LPC-836. That means at 380mA is should output 390mW. I bought two of them to see how hard they can be pushed. I can set it up in a module with my LPM and increase the current in small increments while the module is heat sinked. I believe they will take more than 380mA, so it may be a 450mW or better with the right lens on it.

These have the same beam specs as the LPC-826, LPC-836 and so on. These are perfectly new laser diodes and when mine get here I will post pics about them.
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Old 06-18-2014, 06:12 PM #4
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Default Re: 650-660nm Mits laser diodes

i bought one too! can't wait to fire it up.
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Old 06-18-2014, 06:20 PM #5
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Default Re: 650-660nm Mits laser diodes

cheech, yeah! I've been stocking up on red diodes lately and I've got quite a few now with more to come. Can't wait to get the two LPC-840s I ordered. I want to see how high they can be pushed. Thanks for looking and for your interest.
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Old 06-18-2014, 09:26 PM #6
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Default Re: 650-660nm Mits laser diodes

I came across these too but didnt heat about it before so just ignored them, just wondering what driver will be used for these? is there anything cheaper than an x-drive or so?
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Old 06-18-2014, 09:48 PM #7
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Default Re: 650-660nm Mits laser diodes

r4mn33k, yes, I ordered three LED drivers that cost $7.95 for all three. As you probably know, many of the red laser diodes are case negative which causes a problem when looking for drivers. These drivers are rated at 350mA, 700mA, or 1050mA depending on the solid state SMD transistor like chips on them. There are three of these chips on each driver and each one adds 350mA to the driver. So, if you remove all but one, you will have a 350mA driver. The link is" 3pcs 1A 3W LED Driver Circuit Board Module C C No Modes CREE SSC DIY | eBay.
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Old 06-18-2014, 10:23 PM #8
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Default Re: 650-660nm Mits laser diodes

Thanks, I was worrying about the case negative thing so I will buy these drivers and diodes have a few hosts and heatsinks lying around that are not big enough for 9mm 445nm and tired of others

I came across this, http://www.ebay.com/itm/NEW-Mitsubis...item20e530284c

10pcs for $100 so $10each, anyone here nearby me in Ontario? to split these or is there enough interest for a GB?

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Old 06-18-2014, 11:06 PM #9
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Default Re: 650-660nm Mits laser diodes

r4mn33k, you are most welcome. Yeah, I saw the link for the ten diodes for $100. I didn't add it as I didn't think anyone would be interested in that many of this diode. Paul
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Old 06-19-2014, 01:26 AM #10
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Default Re: 650-660nm Mits laser diodes

I may just buy 2 of these and a couple flexdrives and make a dual diode build. Would be nice to have 1W of single mode 650.
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Old 06-19-2014, 03:06 AM #11
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Default Re: 650-660nm Mits laser diodes

Isaac, that is a cool idea. If you do it, I would like to see it. I might have to copy that.
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445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
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Old 06-19-2014, 05:34 AM #12
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Default Re: 650-660nm Mits laser diodes

Quote:
Originally Posted by paul1598419 View Post
r4mn33k, yes, I ordered three LED drivers that cost $7.95 for all three. As you probably know, many of the red laser diodes are case negative which causes a problem when looking for drivers. These drivers are rated at 350mA, 700mA, or 1050mA depending on the solid state SMD transistor like chips on them. There are three of these chips on each driver and each one adds 350mA to the driver. So, if you remove all but one, you will have a 350mA driver. The link is" 3pcs 1A 3W LED Driver Circuit Board Module C C No Modes CREE SSC DIY | eBay.
Do you have some reason to believe that those drivers are continuous ground?
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Old 06-19-2014, 05:56 AM #13
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Default Re: 650-660nm Mits laser diodes

rhd, no, in fact I now know for a fact that they are not. They can be isolated from the module, though, and that was what was important to me. I have looked everywhere for a continuous ground driver for a red laser diode, and the only one I could find is the one lazeerer offers for sale. Those are $21.00 each, though, so this was a cheaper option. I thought initially that they were a continuous ground, but I have them now, and they are not. But, I know I can use them because they can take the place of a pill board as long as you don't connect the grounds to the host or module.
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Old 06-19-2014, 06:09 AM #14
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Default Re: 650-660nm Mits laser diodes

Quote:
Originally Posted by paul1598419 View Post
rhd, no, in fact I now know for a fact that they are not. They can be isolated from the module, though, and that was what was important to me. I have looked everywhere for a continuous ground driver for a red laser diode, and the only one I could find is the one lazeerer offers for sale. Those are $21.00 each, though, so this was a cheaper option. I thought initially that they were a continuous ground, but I have them now, and they are not. But, I know I can use them because they can take the place of a pill board as long as you don't connect the grounds to the host or module.
Why not just take any simple linear IC and add a ZXCT. Isn't that basically the easiest continuous negative driver anyone could ask for?

I mean, at this current, we could just take a single LM1117 and add a ZXCT, no?

EDIT: Here, like this - no?





(board is 9mm x 10mm)
Attached Thumbnails
650-660nm Mits laser diodes-continuous-negative-v01.png   650-660nm Mits laser diodes-continuous-negative-v01-brd.png  
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Last edited by rhd; 06-19-2014 at 06:47 AM.
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Old 06-19-2014, 06:45 AM #15
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Default Re: 650-660nm Mits laser diodes

Yeah. This could work, but I don't have access to the PCB. I would replace the resistor with a pot. If it could fit inside a module that would be ideal. If you can turn me on to the board and the parts, I would be interested. What are the dimensions of the board? If it is no more than 11mm that would work just fine.
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Old 06-19-2014, 06:51 AM #16
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Default Re: 650-660nm Mits laser diodes

Quote:
Originally Posted by paul1598419 View Post
Yeah. This could work, but I don't have access to the PCB. I would replace the resistor with a pot. If it could fit inside a module that would be ideal. If you can turn me on to the board and the parts, I would be interested. What are the dimensions of the board? If it is no more than 11mm that would work just fine.
Here you go (attached). If you end up making some, could you make me one?

It's 9mm x 10mm, and costs, what, $3 to make? If that?
Attached Files
File Type: zip Continous Negative Linear V01.zip (24.4 KB, 26 views)
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