ok thanks for replying, so basically I just ordered this diode of ebay, 1PCS ORIGINAL Mitsubishi ML101U29-25 400mW 5.6mm 660nm Red Laser/Lazer Diode
https://m.ebay.ca/itm/252553640224?_mwBanner=1&_rdt=1
I watched these diy videos on YouTube, and I guess they basically use this diode or similar...