this is not easy though...... {+^qm8n xe9V'wICp( I guess you need to give a try as sigma indicates the projected width of 1/e squared value of the peak irrdiance in direction cosine space...... for a normally incidence it should be around ~ cosine 85. Good luck !
Hi MANG2004, ra>jVE0` ua
HB\Uc I am curious about your calculation, too. Plus, the definition of σ refers to 1/e^2 width not the FWHM. Even your calculation/defintion is correct. I have a doubt that it will work when the specualr incident ray angle is not normal......... =VPJ
m\*V LG>lj$hO For thsoe who knows it better, please have some input. I am rather curious, too!! Thanks!!
Hi, hopebox, aK4ZH}XHE" !3T,{:gyrI Thanks for your reply. Really like those words “guess”, “doubt”… 1@p'><\ Ub9p&=]h For your curiosity, have good luck! +!9&zYu! \Czuf MANG2004 -lNT"9