The following table describes all of our lasers used for pumping the helium cells. Following the table, there are a few tips and tricks to troubleshoot any problems with the lasers (encountered during my lifetime in the labs here!).
| Laser Number |
Max. Power (W) |
Current (A) |
Diode Temp. (°C) |
Wavelength (nm) |
Linewidth (nm) |
Tested on (date) |
| 1* | 31.5 | 41.4 | 12.0 | 794.96 | <2 | Nov 14, 2005 |
| 2† | 28.3 | Jun 23, 2005 | ||||
| 3 | ||||||
| 4 | in repair | |||||
| 5† | 28.7 | Jun 28, 2005 | ||||
| duo1-ld0 | 30.5 | 35.0 | 21.3 | 794.96 | 1.6 | Dec 01, 2005 |
| duo1-ld1 | 29.1 | 35.5 | 20.0 | 794.96 | 2.2 | Dec 01, 2005 |
| duo2-ld0 | 29.5 | -- | 18.2 | 794.96 | <2 | Oct 04, 2005 |
| duo2-ld1 | 29.4 | -- | 13.1 | 794.96 | <2 | Oct 04, 2005 |
Notes: In the table above, the duo refers to the DuoFAP system, and the "ld0" and "ld1" refer to the first and second laser, respectively, in the DuoFAP.
* The cover interlock screw depresser of this laser was broken, so I've put in a rubber cork in there to depress the screw. If this laser ever shows "External Interlock Open", when everything else is fine, check this screw.
† Lasers 2 and 5 were tested with Coherent fiber number 5, and without the Spectrum Analyzer. So these results are not good. Fine tuning needs to be done to get the diode temperature set for the right output wavelength, whence the power too will change. The relationship goes thus: Δλ/ΔT = 0.28nm/(C°); ΔP/ΔT = -1%/(C°)