Which objects with narrow reflected wavelength range can you recomend (and give references/links why you desided that these objects have narrow reflected wavelength range). I need this information for the experiments.
explanation e. g. here: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3880&gclid=COXB0Me3q8kCFRUTGwodNKIO1g
And Sorry: they don't do what you want. My first message was too quick and without thinking:-( Should have written: try a bandpass filter together with a mirror...