Dear All,
It appears to me that commercial (e.g. Edmund Optics) light (including NIR upto 900nm) power meters are for measuring powers of 100mW and above. In many optical spectroscopy techniques powers much below this is used, where e.g. in RAman spectroscopy mW powers are common. Are there commercially available meters that can provide this absolute accuracy? Previously I have used a high power calibration (0.5 W) and scaled down to low power, thus, assuming a linear relation of the optical system. Can we do better than this by some means? I was thinking of using some photopolymer, but not sure how well standardized they are in the 800 nm range.
Best regards
Power meters based on calibrated photodiodes are appropriate for lower powers. Silicon is starting to lose sensitivity in the NIR but is still good enough for 900nm.
https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3328
Yaptığın çalışmalar doğru. Fakat fotopolimerler ve diğer çalışmaların daha sağlıklı olması için raman ölçüm cihazlarından daha hassas ölçüm cihazları olması daha doğru sonuçları verir.
We also use ThorLabs sensors.
https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3328
Dear Juan
As Mike Albert suggested there are many good silicon-based detectors that have microWatt resolution or better. If you are partial to Edmund optics, or you already have a meter from them, they have a detector (https://www.edmundoptics.com/f/edmund-optics-power-and-energy-detectors/14918/ ) with a 10pW noise floor and a maximum incident beam power of 300 mW. As mentioned by both Mike Albert and Kirill Brehov, Thorlabs generally gives good value for the cost. Coherent/Ophir power meters are also worth considering.
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