16
Solutions, Advice and Experience / Re: Keeping our kHz laser at the right temperature
« on: June 14, 2019, 02:09:08 PM »
Recovered post:
Hi,
I have a question especially for HighQ laser users (Matt, Sven, Franz et al.), what chiller are you using? Do you have some model from Lauda, with what specifications (cooling power, temperature stability; @Matt: how big deviations in temperature you had when you noticed the calibration changes?) We need to get a new one to replace our >10 year old Lauda in Metsähovi with a new one, and I'm trying to find the "best" option suited for our needs.
The backround is: we run into problems with the water cooling unit as we are not using our laser that much... even though the chiller has been on most of the idle time (and we have changed the water every once in a while), there was a major blockage inside the post amp. I had to use quite a lot of brute force, nasty chemicals and sharp tools to get the blockage open. Finally after this, everything went fine for some time until suddenly the water connector on the backside of the HighQ post amp analog modules broke down spraying the water all over the laser controller rack. Fortunately pretty much all of the electronics were shut down and everything seems to still work. Now finally the fan inside the cooling unit has stopped working (probably the motor is broken, pretty much impossible to replace) and the unit burnt two fuses while I was trying to operate the laser.
Lesson learned: be cautious and suspicious if you have water hoses connected on top of your electronics rack. Apparently it is the initial design from HighQ, seems that the connector was tightened too hard which had cracked the connector.
BR,
Arttu
Hi,
I have a question especially for HighQ laser users (Matt, Sven, Franz et al.), what chiller are you using? Do you have some model from Lauda, with what specifications (cooling power, temperature stability; @Matt: how big deviations in temperature you had when you noticed the calibration changes?) We need to get a new one to replace our >10 year old Lauda in Metsähovi with a new one, and I'm trying to find the "best" option suited for our needs.
The backround is: we run into problems with the water cooling unit as we are not using our laser that much... even though the chiller has been on most of the idle time (and we have changed the water every once in a while), there was a major blockage inside the post amp. I had to use quite a lot of brute force, nasty chemicals and sharp tools to get the blockage open. Finally after this, everything went fine for some time until suddenly the water connector on the backside of the HighQ post amp analog modules broke down spraying the water all over the laser controller rack. Fortunately pretty much all of the electronics were shut down and everything seems to still work. Now finally the fan inside the cooling unit has stopped working (probably the motor is broken, pretty much impossible to replace) and the unit burnt two fuses while I was trying to operate the laser.
Lesson learned: be cautious and suspicious if you have water hoses connected on top of your electronics rack. Apparently it is the initial design from HighQ, seems that the connector was tightened too hard which had cracked the connector.
BR,
Arttu