>Clemente
There are a number of cheap power "meters" that are basically a block
of carbon on the end of a thermometer. Since the heat capacity
doesn't change, if you lase it for a fixed time, the temperature
change is easily equated to laser power.
Our carbon block is rated up to 2000W/ sq cm. We haven't punched any
holes in it yet. Its on a mechanical thermometer and cost about $200,
10 years ago from Optical Engg. Inc, 3300 Coffey, Santa Rosa CA,
95403. ph 707-528-1080. Other meters are mounted on thermocouples,
for more money.
Its very useful to be able to make this measurement. For one thing,
when the charge in your CO2 laser goes south, the power drops off.
John
>Dear Mike,
>
>A 25W Synrad CO2 laser works fine for quartz (not tested extensively for
>other minerals yet ...). I had to include a 7X beam expander before the
>focusing lens (4.0"/101,6 mm focal distance) after breaking half a dozen
>BaF2 windows (occasionally with ClF3 inside the chamber!). With the actual
>configuration, no more breakages and bright, quick Q combustion at just
>above 50% power setting.
>
>Prof. Valley, could you please expand on your "inexpensive" method of power
>measurement?
>
>Cheers,
>
>Clemente
>
>
>
>
> >Hi,
> > Another laser related question for the list. For those of you
> >using CO2 lasers for heating and gas release work, what wattage CO2 laser
> >are you using?
> >
> >TIA
> >Mike
> >
>
>
>
>*******************************************
>Dr. Clemente Recio
>Laboratorio de Isótopos Estables
>Fac. de Ciencias
>Univ. de Salamanca
>Plaza de la Merced, S/N
>E-37008 SALAMANCA
> SPAIN
>
>Phone: (+34) 923 29 45 00, Ext. 1540 (Automatic Switchboard)
>Fax: (+34) 923 29 45 14
>E-mail: [log in to unmask]
>*******************************************
.
John W. Valley, Professor phone: 608-263-5659
Dept. of Geology and Geophysics fax: 608-262-0693
University of Wisconsin email: [log in to unmask]
1215 W. Dayton St.
Madison, WI 53706, USA http://www.geology.wisc.edu/people/valley.html
Zircons Are Forever- http://www.geology.wisc.edu/zircon/zircon_home.html
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