slides - CASA
slides - CASA
slides - CASA
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Smith-Purcell laser produces two types of<br />
radiation<br />
Below threshold current: Above threshold current:<br />
λ = l<br />
n<br />
⎛ 1 ⎞<br />
− cosθ<br />
⎝<br />
⎜<br />
β ⎠<br />
⎟<br />
θ<br />
Electron<br />
beam<br />
Radiating<br />
wave<br />
Evanescent<br />
wave
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