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The hardware you have selected is fine except as Shmackitup mentioned about focus lens. A 9v battery will not work. They can't supply adequate amperage. I strongly suggest spending the extra money for a real laser diode driver and use 2 lithium batteries in series (18650). I would pull fan power...

I have similar problems with G8. I do not know why it does not just come in a longer barrel.

18650batterystore is always my first stop for batteries. They are great, but lately their button top selection has been limited.

I tried to stay out of this one, but the last time I ordered from AixiZ I had very similar issues. After over a month I had to file a PayPal dispute to get a refund. I will not order from them again.

Glad to hear it. Next time you will be able to do it in 30 min.

This is both circuits combined. Everything left of LD+ and LD- is the test load, and everything to the right is the CC driver. The test load section shows where to attach a volt meter to read the current to the laser diode. On the driver section, "RES" and "POT" set the output current. Note it...

What results are you getting. Do the diodes light up at all. Are configured for CC mode on the 317s. What collimating optics? Test load?

You are correct. Your equations work to an extent, under ideal conditions. You also have to factor in ambient loss, purity of your sample, etc. A commercial power meter already has calibration for all relevant factors.

My favorite book on HeNe projects is "The Laser Cookbook" by Gordon McComb.

Cool enclosure. Glad you got it running. Again, it would be nice if the label were legible. It tells you input voltage. Are you looking to actually switch on and off rapidly or just modulate intensity? When you switch the low voltage on it activates an igniter circuit in the power supply. This...

I remember going to the downtown library to access the microfilm file system to get copies of laser articles from "old" Scientific Americans.

The specs you are looking for are "static alignment" and "pointing stability". This is usually only listed on high end lab lasers. You will likely not find perfect accuracy, but you may be able to find a high enough degree of precision. My thought is a mechanical collar of some sort that assures...

Google has many videos on the subject.

Decades ago I played a small part in designing the modern IQ test. IQ is theoretically a measurement of one's ability to learn. It involves things like visualization skills, spatial reasoning, logic, deductive and inductive reasoning. It has nothing to do with what facts and figures you know. It...

Pretty sure the green takes batter+ towards tail cap.

If this is the same laser, notice battery orientation and mode switch. 5000 mW is definitely a "hot" beam.

I just received an order from them 2 weeks ago. It took about 1 month from placing the order to delivery.

If you want to test up to 5A, then your diodes must be rated for 5A or more, and a high watt resistor. Mouser Electronics has everything you need. https://www.mouser.com/?gclid=EAIaIQobChMInYjg7tLS9AIVMBXUAR0HfAe2EAAYASAAEgIVSfD_BwE I like to use 3 diodes and 1 Ohm resistor. With test load...

A driver should never be powered up with no load. Instead of using you expensive and fragile diode as a load, you can use a string of 3 or 4 cheap 1n4001 diodes in series with a 1 ohm resistor to simulate the laser. 4001s are good up to about 1 amp. If you google "laser diode test load" you will...

So your driver is configured for case positive and your new diode is case negative. This means that your diode and module will have to be insulated from host. You are really going to need a simple VOM ($10.00 ) and a test load ( <$5.00).