introductiontowaveWord格式文档下载.docx

introductiontowaveWord格式文档下载.docx

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•Notehowthewavepatterndefinitelymovestotheright.

•Howeveranyparticularpoint（lookattheblueone）justmovestransversely（i.e.,upanddown）tothedirectionofthewave.

WaveVelocity（WavePhaseVelocity）:

•Thewavevelocityisdefinedasthewavelengthdividedbythetimeittakesawavelength（green）topassbyafixedpoint（blue）.

⏹Wave-frontsarehelpfulfordrawingpicturesofinterferingwaves.

⏹Awave'

swave-frontssweepalongatthespeedoflight.

⏹Aplanewavehasflatwave-frontsthroughoutallspace.Italsohasinfiniteenergy.Itdoesn’texistinreality.

InSphericalCoordinateSystem

InCylindricalCoordinateSystem

Harmoniccylindricalwave

Aperfectcylindricalwave

Thelengthofwavetrainofasinglephoton（波列长度）

Lightsource

λ0（nm）

Δλ（nm）

Τ

L0

CdLamp

643.8

1.3*10-3

good

1.1ns

0.32m

KrLamp

605.8

5.5*10-3

0.22ns

0.067m

HgLamp

546.1

5

poor

0.2ps

60μm

NeLamp

632.8

2.0*10-3

0.67ns

0.2m

IncandescentLamp

550

300

Verypoor

~3fs

~1μm

He-NeLaser（CW）

~1.3*10-3

~1ns

0.2~0.3m

He-NeLaser（SingleMode）

1.0*10-9

Verygood

1.3ms

4*105m