Coherent Purelight Star

[spectre]

Hi,

Does anyone have the following data for a Coherent Purelight Star:

(a) Tube voltage range and lowest value before refill
(b) Maximum tube current

Is the system with ampoules as the I-70? Any idea what average power is regained by an ampoule?

Thanks,

Alex
Spectre Lasers-Malta

[funkydoctor]

Hi Alex,

the maximum tube current is 40A (mixed gas). The tube voltage has to be between 210 and 220V (mixed gas). The Purelight Star has 4 ampoules under the tube, but you can´t say one ampoule offers XmW more output power. When you breake an ampoule the tube voltage climbs up a bit (up to 4V with one ampoule). But then the output power falls down. You have higher output @ lower tube voltage! But after breaking an ampoule you will get much more red, because the ampoules are mainly filled with krypton.

Tobias

[spectre]

Hey thanks Tobias, very good info.

I am looking at a Purelight Star giving 3.7W at 1400 hours, but tube voltage is 200V. This seems to be very low then.

There are 3 ampoules, but from what I understand, these will not increase the 3.7W appreciably. Is that right?

Thanks for your help.

Alex

P.S. What about your listed coherent? What condition is it in?

[funkydoctor]

Hi Alex,

200V is very low. The lowest possible tube voltage is 195V. Under 195V the power supply will shut down. You can break one or two ampoules and you´ll receive much more red in the output. But after that the laser won´t make 3.7W. He will fall to about 3W, I think.

My Purelight is a Purelight 1 (older model than Purelight Star) in excellent condition. This model has total 4 ampoules and a bigger ballast tank. Two of these 4 ampoules are broken and 2 are not used, yet. The tube voltage is 208V @ 40A with 3.1W output.

Tobias

[spectre]

Tobias,

The same range of tube voltage is applicable to the Purelight I and the Purelight Star?

Does the Purelight I have CE marking or European conformity certification? Here in Malta it's very difficult to import without these.

Thanks.

PS. Why is it a Purelight I? Was there also a Purelight II?

[funkydoctor]

Hi spectre,

I don´t know the tube voltages for all models, but the tube is nearly the same, so the tube voltage has to be the same, too.

The purelight 1 doesn´t have any certifications, because it was built in 1993. In 1993 the CE certification was not very popular.

I don´t know if there was a model called purelight II. I know that there are different types of purelight star. The actual model is called purelight star c, but I don´t know if there were models with "a" or "b". The head of the purelight I system is a bit bigger than the purelight star housing.

Tobias