AntSLA
0
- Joined
- Jul 5, 2018
- Messages
- 5
- Points
- 3
I have an Omnichrome series 74 He:Cd laser and I am having trouble getting it to produce UV light. I've found a manual and it says the following:
"The Helium pressure in the plasma tube is a few Torr. Cadmium vapor is ionized in the discharge capillary by cataphoresis at the rate about 1 milligram per hour. Within the capillary Penning ionization of the Cadmium atoms by metastable helium atoms produce the necessary population inversion to produce optical gain at 441.6nm or 325.0nm."
I am currently getting a violet/blue visible light which I'm guessing is the 441.6nm but I am not getting the 325.0nm UV. I am wondering if it is anything to do with the Helium pressure/temperature because on the power supply there is an LED for cadmium heater and an LED for the helium heater but the helium heather LED never comes on, could it be faulty resulting in only blue light?
Any insights would be greatly appreciated.
Thanks,
Ant.
"The Helium pressure in the plasma tube is a few Torr. Cadmium vapor is ionized in the discharge capillary by cataphoresis at the rate about 1 milligram per hour. Within the capillary Penning ionization of the Cadmium atoms by metastable helium atoms produce the necessary population inversion to produce optical gain at 441.6nm or 325.0nm."
I am currently getting a violet/blue visible light which I'm guessing is the 441.6nm but I am not getting the 325.0nm UV. I am wondering if it is anything to do with the Helium pressure/temperature because on the power supply there is an LED for cadmium heater and an LED for the helium heater but the helium heather LED never comes on, could it be faulty resulting in only blue light?
Any insights would be greatly appreciated.
Thanks,
Ant.