Does Coherent Light Waves Frequency Matter?

[west]

does coherent LIGHT waves with a constant phase difference MUST have the same frequency?

what about LIGHT waves with the same frequency only? will it be not coherent??

 

[Andy Resnick]

Coherence is a statistical measure of the field. The two major 'limits' are temporal coherence, related to frequency spread, and spatial coherence, related to the size of the source. So, it's very possible to have a highly temporally coherent, spatially incoherent source (most lasers have this type of radiation), or highly spatially coherent and tempoerally incoherent radiation (distant stars).

 

[west]

err so may i know what you are trying to say? i can't catch your words...maybe a direct answer to those questions would be better

TQ