In search of infrared light source for coaxial fiber illumination
Posted: Wed May 01, 2019 5:13 pm
I know this is an odd question, but I have been helping a friend improve the photomicrographic setup in their lab. I was able to help with the camera and the optics, but they're also looking to improve their illumination. This is where it gets tricky, since they use 830nm near infrared coaxial illumination. Their current illuminator is a 300w oriel unit, which I thought at first look to be using a xenon bulb but apparently uses 300w 24v halogen bulbs instead? Specifically Ushio 1000845s https://bulbster.com/lightbulbs/ushio-j ... -4250.html
I am not sure if it has been modified to use these bulbs or if that's actually what it is meant to take.
Their current illuminator has developed some inconsistencies and is not portable, so ideally I'd like to get them something like a standard 150w illuminator. However all the ones I've looked at seem to have significant IR filtering (which makes sense for a cool light source), and I can't find any illuminator (or really anything) that would accept 300w 24v halogen bulbs. Plenty for 150w 24v halogen bulbs, and one that's 250w.
At the moment I have a few ideas, but I am not sure if any of them are good. The first two in particular are a bit too dangerous for me to feel good about trying without some reassurances.
The first is to attempt to modify a 150w halogen bulb for a normal 150w fiber illuminator. They have a double-shell construction, with the inner halogen contained within an outer bulb. I wonder if removing the front glass plate will allow IR to pass through, or if it will just make the bulb explode.
The second is to just put one of the 300w bulbs in a 150w 24v illuminator and see if it catches fire.
The third is to try and modify a 300w xenon source to take his 300w bulbs instead of what it's supposed to take, but this is definitely not something I'd approach incautiously or comfortably.
Fourth, I ordered an 830nm LED bulb meant for therapeutic IR usage. I am not sure if it will be particularly possible to couple that to a fiber light guide given that it's a few distinct point sources. Maybe with a diffuser and lens??
Or fifth, just tell them to scrape up the cash for something like this from thorlabs. it's 850nm but produces a reasonable amount of 830 too https://www.thorlabs.com/thorproduct.cf ... ber=M850F2 (I am also not sure if this just plugs into a wall or if there's going to be more to do after it's bought).
Does anyone know how insane the above ideas are, and or if there's a better option?
I am not sure if it has been modified to use these bulbs or if that's actually what it is meant to take.
Their current illuminator has developed some inconsistencies and is not portable, so ideally I'd like to get them something like a standard 150w illuminator. However all the ones I've looked at seem to have significant IR filtering (which makes sense for a cool light source), and I can't find any illuminator (or really anything) that would accept 300w 24v halogen bulbs. Plenty for 150w 24v halogen bulbs, and one that's 250w.
At the moment I have a few ideas, but I am not sure if any of them are good. The first two in particular are a bit too dangerous for me to feel good about trying without some reassurances.
The first is to attempt to modify a 150w halogen bulb for a normal 150w fiber illuminator. They have a double-shell construction, with the inner halogen contained within an outer bulb. I wonder if removing the front glass plate will allow IR to pass through, or if it will just make the bulb explode.
The second is to just put one of the 300w bulbs in a 150w 24v illuminator and see if it catches fire.
The third is to try and modify a 300w xenon source to take his 300w bulbs instead of what it's supposed to take, but this is definitely not something I'd approach incautiously or comfortably.
Fourth, I ordered an 830nm LED bulb meant for therapeutic IR usage. I am not sure if it will be particularly possible to couple that to a fiber light guide given that it's a few distinct point sources. Maybe with a diffuser and lens??
Or fifth, just tell them to scrape up the cash for something like this from thorlabs. it's 850nm but produces a reasonable amount of 830 too https://www.thorlabs.com/thorproduct.cf ... ber=M850F2 (I am also not sure if this just plugs into a wall or if there's going to be more to do after it's bought).
Does anyone know how insane the above ideas are, and or if there's a better option?