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can we compare the result of laser medium interaction when we use laser at 940 nm and other laser at 2700 nm?
i think the action of laser on the matter of 940 nm different of 2700 nm
and the comparision must be between laser of different active medium but work at the same wavelinght.
It is very difficult to understand what you are asking. How can we say if wavelength (not to mention many other differences in the two lasers) is important without knowing to what interaction you are referring? What are you doing with the lasers? What interaction are you considering?
1) Yes, you can buy He-Ne gas laser (632.8nm) or 633nm diode laser for example from Thorlabs:
https://www.thorlabs.com/thorproduct.cfm?partnumber=HNLS008L-EC
https://www.thorlabs.com/thorproduct.cfm?partnumber=HL63163DG
2) Yes, light/matter interaction can be different in at 940 nm compared to 2700 nm.
3) No, it does not depend on the type of active medium of the laser.
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