How do I solve the following problem step by step? and what arethe solution? I am really lost, and do not understand the wholeexercise..
A femtosecond laser generated light pulses with a duration ofonly 100 fs (ie 1.00 · 10-13 s). With an ordinary lens,such a laser beam focused down to a spot with a diameter of 10 μm.Atypicalenergyofalaserpulsefromsuchlasersis1mJ.Supposethatenergyisuniformlydistributedover thelaserspot,andtheeffect isconstantduringthepulse (asquarepulse).
1.Findtheintensity ofthelaser focus.
2. Findtheamplitude,Emax,of theelectricfield infocus.
3.Comparethisamplitudewiththe sizeofthe electricfield actingonanelectronaroundthe nucleus ofa hydrogenatomingroundstate (Hint:thedistance betweennucleusand electronisgivenbythe sizea0 = 5.29 · 10-11m)Whatdoes thecomparison of thelaser'seffectontheatom
4.Thelaser lightatawavelengthof 800nm.Calculatehowmanyoscillationstheelectromagnetic field undergoesduringthepulseduration.Do youthink that thefrequency of such alaserwillbe moreorlessclearlydefined thanitisforamoretraditionallaser,such asahelium-neonlaser?Argumentandexplainyouranswer,please.
How do I solve the following problem step by step? and what arethe solution? I am really lost, and do not understand the wholeexercise..
A femtosecond laser generated light pulses with a duration ofonly 100 fs (ie 1.00 · 10-13 s). With an ordinary lens,such a laser beam focused down to a spot with a diameter of 10 μm.Atypicalenergyofalaserpulsefromsuchlasersis1mJ.Supposethatenergyisuniformlydistributedover thelaserspot,andtheeffect isconstantduringthepulse (asquarepulse).
1.Findtheintensity ofthelaser focus.
2. Findtheamplitude,Emax,of theelectricfield infocus.
3.Comparethisamplitudewiththe sizeofthe electricfield actingonanelectronaroundthe nucleus ofa hydrogenatomingroundstate (Hint:thedistance betweennucleusand electronisgivenbythe sizea0 = 5.29 · 10-11m)Whatdoes thecomparison of thelaser'seffectontheatom
4.Thelaser lightatawavelengthof 800nm.Calculatehowmanyoscillationstheelectromagnetic field undergoesduringthepulseduration.Do youthink that thefrequency of such alaserwillbe moreorlessclearlydefined thanitisforamoretraditionallaser,such asahelium-neonlaser?Argumentandexplainyouranswer,please.
