ML501P73 Mit. 638nm 500mW Silver Big Boy

[jander6442]

After participating in the Big Boy GB I finally got around to a build. I must say the big boy is prolly my favorite host to date, it has the whole package it is not to big and very well built. The batt. holder has no rattle to it and there is plenty of room. The pill is very chunky great for heatsinking drivers. The depth of the pill puts it in the finned area of the host, again a great advantage that is purpose built.

I will spec it when I get a chance, but for now it is bright as all and a pretty good burner as well

Mit. ML501P73 500mW from DTR pressed into a copper mod. https://sites.google.com/site/dtrlpf/home/diodes/mitsubishi-635nm-500mw-diodes

Heatsink and focus ring are from Eudaimonium, he had a great design so instead of making one I went with his:beer: turned out to be a great deal, good quality, and great price.
http://laserpointerforums.com/f64/eudaimoniums-machine-shop-73749.html

The driver is a X-drive set at 1.539A from Clif at Cajunlasers who sells pretty much everthing you'll ever need so go see him here. Cajunlasers Store:thanks: Lazeerer is the designer of the X line of drivers I also used his 638nm lens for this build also.:wave::beer: once again Angelos is the man:wave:

Thermal adhesive used to adhere the Xdrive to the pill and a small sink on the inductor also.

Flipping the pill was an idea I got from Comet221 here http://laserpointerforums.com/f55/ongoing-big-boy-3x18650-host-30-a-77100-8.html#post1121499 I also spun the spring around on the battery holder like he did although I didn't see it until I wrote this up. I know the battery holder modification was originally posted by Kizdawg:wave: here http://laserpointerforums.com/f55/ongoing-big-boy-3x18650-host-30-a-77100-7.html#post1118680 Thanks for that fellas.

I wouls also give credit to member ryansoh3 for putting the GB together in the first place:thanks:.

So far I'm having a hard time putting this 638nm down, it has my number. The units beam comes out about as straight as any I have made or purchased maybe rifle quality. Euds ol man must really have been some Army guy or something.

Sure the divergence is horrible, but with the X-lens it is manageable... I will do some beam shots when I fire the fog machine up tonight:evil: and give it a reading. I would label this unit, but it's to pretty for that. Thanks for looking and good day. -jander6442

Well it was not as efficient as hoped, but hey I have a 1W 638nm thats badarsh. Very happy with that I'm sure my neighbors aren't gonna be:san:

I noticed the slight drop in the chart is when I had the window open it's nice here in FL perfect weather.

more beamz:

super heavy fog

 

[ApexProxy]

Dude, that is one clean build bro. Now I need to grab myself one of those hosts... they are totally wicked.

 

[jander6442]

Dude, that is one clean build bro. Now I need to grab myself one of those hosts... they are totally wicked.

Thanks man,:thanks: good feedback is always welcome.

 

[Hiemal]

I wouldn't recommend putting any heatsink material onto the inductor... by adding metal, you're changing the properties of the inductor, increasing or decreasing the inductance. It can change how efficiently the driver works.

That and you're basically causing heat to the heatsink anyway, but not in the manner you're thinking of; the losses of the heatsink metal are a lot higher than the ferrite core, so the metal will basically "induction heat" itself without contributing anything positive to your pill...

Other than that, it looks great Jander. Nice big red beam!

 

[jander6442]

I wouldn't recommend putting any heatsink material onto the inductor... by adding metal, you're changing the properties of the inductor, increasing or decreasing the inductance. It can change how efficiently the driver works.

That and you're basically causing heat to the heatsink anyway, but not in the manner you're thinking of; the losses of the heatsink metal are a lot higher than the ferrite core, so the metal will basically "induction heat" itself without contributing anything positive to your pill...



Other than that, it looks great Jander. Nice big red beam!

First thank you for the complement, now correct me if I'm wrong and not so much in this application. The Xdrive is a very efficient driver, but there is not that much current running thru this set up that the driver would need to be sinked on the inductor. It's basically eye candy the case and point though is I have had these up past the 1.8A and they really get hot now once they are saturated if a heatsink is disrupting thermal protection I understand not sinking it then, but at these sizes and the nominal amperage I doubt that I'm bypassing thermal regulation of the inductor.

I'm not arguing just saying that once these small drivers are saturated any sinking is better than not.

I digress also because I'm not one to dispute an electronic engineer.

 

[DTR]

Great looking build. Those are some excellent hosts. The heatsink and focus adapter look very well made and you did a great job with the assembly:beer:

Over 1W with the C-lens actually sounds pretty good from the diode as far as efficiency goes. I do really like the new C-lenses that Lazeerer has as they do give the best for divergence by far but they do have the most losses compared to the three element lens(Aixiz) or the G-1/2 lenses.

Also I would like to point out that when driving these diodes so high you will see a lot of wavelength shift. They are more than likely about 10-20nm higher than the data sheet average of 638nm. Looking at the datasheet you have a 12nm jump just going from 500mA-800mA with 644nm being the result @ 800mA and that assumes you can keep the diode under 40°C. My bet is they are passing 650nm when being driven this high. Just wanted to note this as some people have had concerns and stated to me that their higher power builds with these look the same color as their 650/660 lasers and I tell them that it probably is because of the currents they are being driven to.

 

[Kizdawg]

Love the build! I origionally wanted the silver host for a red build too. 1W of 638 is a awesome sight! I definately need to grab on of those corective lenses for mine.

 

[jander6442]

Great looking build. Those are some excellent hosts. The heatsink and focus adapter look very well made and you did a great job with the assembly:beer:

Over 1W with the C-lens actually sounds pretty good from the diode as far as efficiency goes. I do really like the new C-lenses that Lazeerer has as they do give the best for divergence by far but they do have the most losses compared to the three element lens(Aixiz) or the G-1/2 lenses.

Also I would like to point out that when driving these diodes so high you will see a lot of wavelength shift. They are more than likely about 10-20nm higher than the data sheet average of 638nm. Looking at the datasheet you have a 12nm jump just going from 500mA-800mA with 644nm being the result @ 800mA and that assumes you can keep the diode under 40°C. My bet is they are passing 650nm when being driven this high. Just wanted to note this as some people have had concerns and stated to me that their higher power builds with these look the same color as their 650/660 lasers and I tell them that it probably is because of the currents they are being driven to.

Looks to be in the Orange range in my pics and compared to other lpc builds it still looks to be more 638ish than my 300mW build any day. Thanks for the kind words.

 

[Comet221]

Great build, everything look so neatly done up.
Now I'm tempted to get a red too.:eg:

 

[Blord]

Didn't I see this host before ? :na:

Great build in an epic host. 1 Watt red is still impressive !

 

[jander6442]

Didn't I see this host before ? :na:

Great build in an epic host. 1 Watt red is still impressive !

Thanks Blord, I appreciate your kinds words man, thanks:beer:

Great build, everything look so neatly done up.
Now I'm tempted to get a red too.

Thanks Comet, If you notice I gave you cred for your flip up on the pill. Sometimes it's the little things that make it just that much better and they often get over looked and you reminded me to stop and take notice.

 

[Kizdawg]

Yeah I loved that pill idea.. Sorry I havent got back to my posts I have been so busy and we got 1ft of snow dumped on us again last night.. Eh the restaurant was still busy today so it's all good. Still love this build.. Great pics... And had Blord not have given me the incentive to search it out and do it myself I wouldnt have got there with the battery carage so he deserves some rep too..