Is the laser perfect monochromatic light source?
May 10, 2013 #2 mfb Mentor Insights Author 36,397 13,468 Nothing is perfect, but lasers are the best approximation we have - their line width can be below 1 Hz for visible light. A perfect monochromatic light source could not be switched on/off ;).
Nothing is perfect, but lasers are the best approximation we have - their line width can be below 1 Hz for visible light. A perfect monochromatic light source could not be switched on/off ;).
May 11, 2013 #3 Andy Resnick Science Advisor Education Advisor Insights Author 7,782 2,829 Typical commercial lasers have linewidths ranging from kHz-GHz (He-Ne and Nd:YAG) up to a nm (laser diodes). In the lab setting, laser linewidths can go as low as 1Hz, but AFAIK that's approaching a fundamental limit.
Typical commercial lasers have linewidths ranging from kHz-GHz (He-Ne and Nd:YAG) up to a nm (laser diodes). In the lab setting, laser linewidths can go as low as 1Hz, but AFAIK that's approaching a fundamental limit.