How to Make a Laser




Introduction: How to Make a Laser

After opposition against this instruction by some of the members i realized that there are some problems with my attempt to make laser. In this instruction i do y best to portrait how a laser works and how to make one.

This is an expensive project.

Step 1: What Is Laser

If you want to make something first you should know how it works.

So what is a LASER?


Step 2: The Structure of a Laser

A laser works this way :

Imagine a pipe with a rod of ruby and an illumination inside it and a coil around the pipe.

This is the structure of a RUBY LASER a easy-to-understand laser because there are many types of lasers.

source: wikipedia

Step 3: How to Make a Laser

At first this instruction was about how to make a laser which appeared as a vain attempt because i forgot about the ruby part but i try to fix it as soon as I can.

Here are the requirements for this project:

1-hot glue


3-pipe: I used a plastic pipe my self and I don't know if using iron metal pipe will do or not.

4-wire for making coil

5-PCB board


7-ruby rod that fit's in your pipe tightly

Remember that you ruby bar should be shorter in length than your pipe.

Step 4: Making the Coil

All right burn one end of your wire and remove the blackened part because we want to connect it to a power source.

Wrap the wire around the pipe I myself wrapped it three times.

After finished with wrapping you should cut the wire in a way that it has enough to get connected to a power source.

Burn the other end of the wire and remove the blackened part.

After you wrapped the coil tape the end of it.

Step 5: Assembe Your Laser

Solder three LEDs in parallel on a PCB board and glue it to one end of the pipe and connect the wire from the coil to wires coming from LEDs.

Now put the ruby rod inside the pipe.

Step 6: Finish

The longer the length of your pipe the length of your coil and the more voltage you gonna need. The pipe I used myself was about five centimeters and took 9 volts to operate.



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    14 Discussions

    Изглежда, не е сериозно. Този тип лазер има две огледала, едно обикновено прозрачен и един, който е полу-рано. Когато фотони възбуждат атомите се движат сега подскачащи от един, а след това от друга, докато те достигнат определена сила и да мине през полу-прозрачна кохерентна светлина. Първият лазер е рубин и възбуждане светлина се използва като тези в апарата за снимка. тук. Може изпълнението с бобината, но е различен от този тук. Може изпълнението с намотка, но е различен от този тук.

    2 replies

    I am sorry i dont understand what you say

    I'm sorry, but I have written to Bulgarian. This below I meant.

    It seems not serious. This type of laser has two mirrors, one generally and one transparent which is semi earlier. When photons excite the atoms move now bouncing from one, then the other until they reach a certain force and pass through semi-transparent coherent light. The first ruby laser excitation light and is used as such in the camera for a photo. here. Can performance with the coil, but is different from this one. Can performance with the coil, but is different from the one here.

    two key works on it: ionization and polarization. Tho achieve coherent light wave flux ( That's what lasers really are!). So, ruby ( or other doped crystal) or gas has similar affect to produce laser. I am about to intent an endeavor using a power LED, ruby, glass pipe and a coil. If it become functional, I will publish the instructable for the community! Thank you Kaveh2!

    1 reply

    Thanks dude.

    That was a good news although mine didn't work.

    sorry about my orthographic errors! It's due to my Portuguese oriented orthographic corrector and some misplaced characters! ( LOL )

    the reason ruby lasers work is because ruby is a crystal made of aluminium oxide with chromium that gives it it's red color. to power it, a xenon flashlamp like those in a camera flash, is coiled around it. the wavelength of light from the xenon excites the chromium atoms to a higher energy state, then when then drop back to normal, the energy is released as a photon, a single particle of light. the ends of the ruby are mirrored, one end 100%, the other 95%. as photons strike the mirrored ends, the bounce back and forth collecting more on each pass, until the 95% end can no longer hold back the light and it escapes as a laser beam. if you can figure out what material may react in a similar way to a magnetic field, you may be onto something. i applaud your ingenuity and enthusiasm.

    1 reply

    Whether or not the way you did it was correct or not. Your explanation taught me exactly what the title told me you would be explaining and I wanted to say you did a pretty good job. So don't give up just because other people got butthurt :)

    1 reply

    2 years ago

    I strongly doubt red glass does anything... I have never heard of stimulating laser crystal with magnetic field but if you take a look at this, you will see that "red glass" can't be used for lasers. You can use glass that has been doped with ions but not just random tinted glass...

    Ruby lasers work on following principle: you excite atoms in ruby crystal so their electrons jump to higher energy state with light (very high power). Since energy states are quantised (ask your chemistry or physics teacher about this for better explanation), only one wavelength will excite electrons (I am overly simplifying). When light source is removed, electrons drop to "normal" energy level and emit light while doing so. Same as before, because energy levels are quantised, only one wavelength is emitted and this is what we call "laser".

    There are many ways laser modules can be made. Most common ones are semiconductor lasers, found in consumer electronics (DVD burners, laser pointers, light show machines, etc.). You can read about that on wikipedia but you can not make one at home.

    Industrial lasers are most commonly either CO2 lasers (which (surprise, surprise) excite CO2 to emit light) and Yb:YAG lasers which use some crystal I know nothing about... But I doubt you want to make any of those at home since even if you would have proper equipment for making it, you likely wouldn't want to throw that much money at the project (for reference, used YAG laser costs 200€ and upwards for 50W module...)

    Hope I helped!

    (and tell your teacher he is stupid for suggesting red glass would work same as ruby...)

    1 reply

    Thank you so much for your sharing your knowledge. I recommended and asked about red glass because i didn't want it to be expensive as you said.

    All i wanted to do with this instruction is to portrait how laser works.

    Did you tried to make Ruby laser by replacing ruby with what red rod of glass,are you serious?

    1 reply

    I asked one of my teachers and he said it's possible.