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You can use any generic diode laser module. Search 650nm or 450nm in china. Sorry, can't post link

As long as you have high quality TEM00 beam you can compress / expand it using telescope. The problematic factor is divergence * spot size

Nd3+ is 4 level system so unexcited molecules don't reabsorb pump light. Excitation speed is mostly dependent on your pump shape as lifetime of Nd3+ is ~250ns. Shape of the rod doesn't really matter but it defines resonator shape and efficiency / power is defined mostly by how well you overlap...

Thanks. It's sad to see that output fiber bundles are more expensive than laser sources themselves.

I looked through faq and could find them. Items where on sale locally and I forgot to take pictures, but I found ebay listings that seem to look same. Can't post link but if you copy paste part nompers into ebay they show up as first results. Considering that SP-941 is for sure high voltage...

I found few potentially interesting laser heads on local surplus market but I have some problem identifying them. Specifically: SPECTRA PHYSICS LINE LITE LASER MODEL 941 HEAD and Spectra-Physics V50-104Q Laser Head

Hi, so I decided to have a go at building custom Q-switched Nd:YAG laser. I'm hoping to go with diode pumping as sound of flashlight constantly firing is tiring after few hours. I found what seems to be good deal on fiber coupled 808nm pump sources but I have problem identifying connector and...

Sure. Misalignment - you can see distinct beams at wall 1-2m away so I'd say spots are 1-2mm apart in RGB order (probably knife edge array instead of dichroics or poorly aligned dichroics, haven't looked inside) It supports ILDA (that I used), but only in on/off mode, no dimming. It also...

First of all you can't legally shine 200mW of laser light into sky in most parts of the world. Pan tilt adjustment is quite simple to achieve. Price simply depends on range, movement speed, precision and if it needs to be digitally controllable. The cheapest and simplest solution would be laser...

Telecom communication modules rarely exit 200mW range, because that's maximum that can be made in single mode and you can't effectively couple multimode diode to single mode fiber. Also you'll find most of them in 13xx or 1550nm range, older ones in 850nm as this are 2nd, 3rd and 1st...

I was thinking about buying such module from china for a long time but then I searched local 2nd hand market and found entire laser projector for around 30e with shipping. Laser alignment is total crap, you can see individual color beams at the output but not sure if cheap china module deliver...

You can try diffraction grating. For low power you can buy cheap plastic ones for "home science experiments". for more power I suggest using ruled reflective grating from some old, used spectrometer

What I usually do is use autocollimator and try to compensate mirror with known lens and from relative spacings count ROC

IR lasers are fine. I think we should distinguish CO2 for cutting, ND:YAG for doubling from stupid, deadly "toy" that has no use but to hurt someone.

Few remarks from my own dye laser experience. 1. dye is mess. Unless you really need tuning (and can't afford OPO) or you really need mode locking (and can't afford TI:sapphire) dye laser is just bad choice 2. This units have dichroic mirrors for coupling. Input coupler is most probably made to...

Thanks for post, reminds me about HeNe at our university that's over 50 years old and still working. Possibly one of the oldest models that still work.