I tried this sight before to find filtering options and got fantastic results, so let's try again!
I am setting up an experiment that requires light of two different frequencies (445nm and 350nm). The light ultimately needs to be focused on a small area. I can think of two good ways to make this happen:
Get a broad spectrum light source that emits over this range - maybe a halogen lamp? - and buy two filters: A high pass that cuts off at ~420nm and a low pass that cuts off at ~380nm. For the low pass, I may also include a high pass in order to make a band pass (or just flat out buy a band pass filter).
I will then simply wrap the filters in a black paper cone to "focus" the light (for this experiment, light spread after hitting my target doesn't seem to important). We would use a power meter to tell us what flux is actually hitting our experiment.
My questions for this approach: What kind of broad spectrum source would you recommend? Can you recommend a retail outlet for this source? Our grant ain't so grand, so afford ability is important. Can you think of a better way to focus the light after it passes through the filters? Again, any retail sources would be appreciated.
- Get two more highly focused sources. Given our small area focusing requirements, we are looking at lasers (Again, 340nm and 445nm). I have found a couple of retail sources that have such lasers, but they are fairly cost prohibitive. Do you know of any sources that sell such lasers - power sources and all - for <500?
Thank you in advance for any help and recommendations. If a paper is produced from this - which I very much am counting on - I will thank the guy who provides the best answer in it (if that is an incentive).