well "deep" is relative, when comparing the price of a laser built here by a member to the price of a commercially available laser it should be cheaper.
I see you own a 600mW how much did that cost you? Brand new? DIY?
I'm assuming "labby" means its a lab laser, can you compare those to handhelds?
It still a diode, lens, ect. They cant be terribly different.
I see alot of 600mW + lasers in blue. Is this due to some mechanical limitations? Are the majority of 600mW+ lasers a single color? Will color adversely effect price?( I'm sure it effects price to some degree as creating light to such a degree of wavelength accuracy cant be cheap and im sure if slightly different for different colors.)
Edit: what is your display picture of? Is it one of those "star generators" that sit on a table and use lasers instead of a light-bulb to project "stars" on the ceiling? My wife and I have wanted to get something similar for our nursery, however the light bulb models are cheaply built, and usually give off too much light for a pretty "iffy" display on the ceiling.
You are very right when you say price is "relative". The comment I made was directed at your desire for yellow or green. Yellow being about the most expensive.
The labby you asked about was a "relatively" cheap one. I bought it from a seller on ebay called aerodynamics. They are based in Australia. I paid $600, shipping included. They often have lasers even more powerful. As far as green labbies are concerned mine has poor divergence, but for the price, I'm very pleased.
As for the innards of a green laser compared to that of a red, a green laser is what is called a DPSS which means that it has an infrared laser that is "pumped" through a set of special crystals before it is emitted as green light. This all requires very precise alignment and is sensitive to temperature and vibration.
You can't really compare labbies to handhelds because labbies need to be plugged into your mains. Also labbies can be left on for long periods of time where handhelds often require a duty cycle.
The 600+mw blues that you are seeing are being made by gutting a projector then putting the diode into a host. These blues operate at around 445nm and are not to be confused with another different blue which emits light at 473nm. The 473nm variety is also DPSS.
As for my avatar, I wish that I had a creative, elaborate explaination for it. I shinned my green laser at my daughters pom pom and noticed that it made a nice reflection so I took a picture of it.
Welcome to the forum and forgive me for being short with you innitially. We often get youngsters here that want to get the most powerful laser they can, and then take them out and act irresponsible with them and this has an adverse effect on our hobby. Use the search function often and ask questions freely. There are many members here that know multitudes more than me. You will probably become a laser addict!