Rami Arieli: "The
Laser Adventure" Java Applets List
Interactive Applets
on The Laser Adventure Web Site:
Creating an Image using Plane
Mirror (Image1):
These simple applet demonstrate how an image is formed by
plane mirror.
Each point on the object sends beams of light in all directions.
The Applet alows you to build the image interactively,
point by point (you even choose the size of the point).
Wavelength Demo and Two wavelengths
(Page
C1s1t1p1.htm,
and C1s1t1p3.htm):
These simple applets show the student that a wavelength
can be measured at any point on the wave.
Unlike all the static drawings in books, which show
the wavelength as measured between two adjacent peaks of the wave.
When a wave pass through a medium of index
of refraction (n), the wavelength and velocity of the
wave change, but its frequency remains
unchanged.
This applet let the student change the value of n, and show
the wavelength change inside the medium.
Snell’s equation includes sinus
of an angle:
n1sin(q1)
= n2sin(q2)
Many students do not understand the behavior of the sinus
trigonometric function.
The applet allows the student to see how a change of each
parameter n1, n2, q1
influence the angle q2.
Using this applet students can learn about:
-
Critical angle.
-
“Total internal reflection".
-
About the direction of bending of
light beam when it pass from one medium into the other.
You are in a room and you have to shoot
a target in another room through a transparent glass
window.
The radiation advance according to the laws of geometrical
optics.
When a beam of light pass through a prism, each wavelength
is refracted according to the index of refraction of the material for this
wavelength.
This applet enable changing the incidence angle, the angle
of the prism, and the material.
A white light is
disperse into the spectrum of wavelengths.
This applet is a simple short game
to show how a population inversion can be achieved between two energy levels.
It helps explaining the term “population
inversion”.
This whole page is designed to explain
the operation of a laser system.
-
At first the active medium is at normal
conditions.
-
With a small excitation, few photons
are emitted in random directions.
-
With high degree of excitation, a population
inversion starts, and stimulated emission results.
-
Adding mirrors at both ends, creates
an optical cavity, and photon starts accumulated in specific direction.
-
Changing the reflectance of one of the cavity
mirrors, an output coupler is created, and photons are emitted
out of the laser, in specific direction.
This applet shows how the stability of the cavity depends
on the cavity parameters.
This applet shows how the laser beam is built inside
different cavities, and how the radius of curvature of the laser mirrors,
and the cavity length, determines the beam divergence.
Click here:
Beams
in Laser Cavity
Laser Range Finder
(in
page
C9s3p1.htm)
:
A simple demo of the operation of a laser range-finder. You measure
the range to a tank on the background picture.
More Appletsdeveloped
by Sergey Kiselev
(used with his permission).
Single Slit Diffraction (Click
Here)
Allows changing the wavelength and the slit
width, and show the result on the interference patten on the screen.
Interaction of Photon with an
Atom (Click
Here)
Animation that shows the process of absorption
and emission of photons by atom.
Laser Operation (Click
Here)
Animation that shows the physical processes
inside a laser.
Image Formation by Converging
Lens (Click
Here)
Interactive applet that enable moving the body in front of a converging
lens, and the influence on the image position and size.
Image Formation by Diverging
Lens (Click
Here)
Interactive applet that enable moving the body in front of a diverging
lens, and the influence on the image position and size.
Image Formation by Concave Mirror
(Click
Here)
Interactive applet that enable moving the body in front of a concave
mirror, and the influence on the image position and size.
Total Internal Reflection (Click
Here)
An interactive applet that allows changing the angle of radiation
from a point source under water, showing the beam inside and outside the
water.
You can download a Zip file of
all the applets developed by Sergey. by Clicking
here.
If you want the last version,
you can go to Sergey's
Web site.
