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Hello, I am looking for a nice 638 nm diode. In the diode list, the sharp 185 nm diode is listed as multimode. At the DTR shop you can find this diode as single mode. That is a little bit confusing. best regards Edgar

Hello, yes, you are right, but this will be 170 mA driver oputput, measured with a current clamp. best regards Edgar

Hello, with the help of my oscilloscope, I increased the current off the 488 nm diode to 220 mA. That gave me an output of 102 mW. After going to to 250 , the driver input current switched from 400 mA to 550 mA with the same output of 250 mA. Because of this strange behaviour I decided to go...

Hello, this is a real long answer! Thank you for that big amount of professional information. I have a test load, built from diodes and a shunt resistor. I had a lot of trouble with cheap chines laser drivers. The 500 mA driver from your shop is an other categorie. You are right, the driver...

Hello, how do you measure the current?. My experience shows, that with most drivers, the output current changes with the voltage of the laser diode. So I can use a shunt resistor in the connection between driver and laser diode. But I hate to resolder this little contacts to get the big shunt...

Hello, I use a little arbour press for this job. The press stamp has a 10 mm hole at the bottom. I turned a 10mm brass rod, with a bore sufficient to take the diode pins without damage. That works fine for me. As I told, I did not kill the diode by pressing, I cut the wrong pin off! Today, the...

Hello, I killed two pen laser pointers, because the Driver had a reverse polarity compared to the blue laser pointer. But nobody mentioned it when i bought the laser pen. Maybe your Diode is nearly dead and runs in the low LED mode. best regrads Edgar

Hello Paul, I think you are right and I have to learn much more about laser diodes. The first diode runs even after the wrong wiring, but only for seconds. The second Diode runs at my laboratory power source at 50 mA. Then I pressed it into the heat sink and it was dead. I think, it was a...

Hello, today I got my two 505 nm diodes. Both did not work until I realized, that they where case positiv. So I connected minus with plus and plus with minus. After that, I could see some bluish green. After this test, I pressed the diodes into a DTR module. What should I say, they are gone...

Hello, I have also only good experince with techhood. Once I bought a defect 9 mm lense, I had no rouble to get a free replacement. best regards Edgar

Hello, in some forums you will find a register, called data files and downloads. Normaly ,comments to this files are not allowed. This keeps this data clean and compact. Is there a data file for the diode list? If not, I will copy it with the snipping tool. I think, in future I will...

Hello, thanks, that is a very useful list. Where did you find it? best regards Edgar

Hello, I searched this forum for a laser Diode comparison list, but could not find one. There are some compact information at the DTR shop, also a lot of information hidden in numerous threads. I would like to see a compact comparison list with information like : mono/(multimode; wavelength...

Hello, yes, I share your opinion, that brass is not the best choice for a heatsink. I use copper 99,99% for this purpose. I also have some rods of nickel copper that would look fine. Maybe I use this material for a little low power laserpointer host. best regards Edgar

Hello, brass is not the worst choice for thermal conduction. It has similar conduction to Aluminium alloys. The best choice for the money is pure copper or pure Aluminium. But did you ever machined pure Aluminium? It is a pain, also pure copper ist not nice to machine. Oh I forgot silver, but...

High Rich, whenever I need a tap and can buy it for a reasonable price, I will buy it. I only make special tools, if I am not able to order ist. Not enough time to do all the things I want. best regards Edgar

Hello, after I noticed, that my first selfmade tap has 11,56*0,5 mm, I made another one. With the support of the german forum "Zerspanungsbude" the second attempt looks better and cuts much better . With this lesson learned, I think special sized taps will be no problem in future. best...

Hello, just visits the Sanwu homepage. They say, that the thread of the beam expander is M 11,4*0,5. Please excuse my ignorance.:cautious: best regards Edgar

Hello, today I made a 11,5*0,5mm tap from tool steel. I had a test run in brass. The tap works in that material, although the grinding of the free angle of the cutter was handmade an a little bit poor. The fit of the beam expander is not a snug fit, it is a little bit loose, but it works. So...

Hello Rich, the diameter of the beam expander thread is 11,44 mm. Normaly the outer diameter of a bolt is undersized. So my guess was 11,5*0,5 mm. best regards Edgar