Read More
Date: 16-3-2016
![]()
Date: 1-12-2016
![]()
Date: 20-1-2021
![]() |
Sum- and Difference-Frequency Generation
Two waves of comparable intensity and frequency ω1 and ω2 are initially present, and a wave at the third frequency ω3 is created through the nonlinear interaction
P(ω3) = ∈0 χ(2)E(ω1)E(ω2), .........(1)
where ω3 = ω1+ω2. Similarly, a wave at the difference frequency ω3−ω2 = ω1 may be generated (ω3 > ω2 > ω1). A very common technique to produce the third harmonic of a neodymium laser is, first, the generation of the second harmonic and then sum frequency generation by mixing the second harmonic (ω2) with the unconverted portion of the fundamental beam (ω1).
|
|
دخلت غرفة فنسيت ماذا تريد من داخلها.. خبير يفسر الحالة
|
|
|
|
|
ثورة طبية.. ابتكار أصغر جهاز لتنظيم ضربات القلب في العالم
|
|
|
|
|
العتبة العباسية المقدسة تستعد لإطلاق الحفل المركزي لتخرج طلبة الجامعات العراقية
|
|
|