Unfortunately this is not a review, rather I want to know some information about CNI OEM-H DPSS modules. I asked CNI about it, but I think my questions are all lost in translation. If you have used these modules, can you answer them for me?
Weartronics: If there is no TEC inside the module, how is the temperature of the diode and the YV04 controlled separately? It is important for OEM-H-473. CNI: the OEM laser do not have TEC usually,we can do TEC for you with additional fee.If you bought the laser,we will provide all the detail parameter for you.
I suspect they are talking about a TEC for the module housing, and none of the modules have internal TEC for the YV04 or SHG crystals. I fear for the power stability of the 473nm module especially. Does anybody have experience with them?
Weartronics: Is any terminal of the laser diode electrically connected to the module housing? CNI: this is absolutely,otherwise how should we control the laser diode?
Because neither anode or cathode of the diode is at ground potential, it means that if any terminal of the laser diode is electrically connected to the module housing, I have to insulate the module from the base plate. It makes the cooling difficult and the power stability worse. Does anybody know if the diode is insulated from the housing?
Weartronics: Why is the expected lifetime for the OEM modules only 5000 hours, when the lifetime for other modules is 10000 hours? CNI: the reason for shorter lifetime is that the OEM laser is a much simple module than the normal,its heat dissipation is not very well and so on, so the expect lifetime is shorter than the normal.
I realise that unlike most lab modules, the cooling is user-supplied in this case. But I still don't understand why the lifetime should be halved. It makes me uncomfortable about buying these modules.