(Order Code LASER)
The Alpec Laser Pointer is a Class IIIa diode laser with a power of less than 5 mW.
The laser has a
wavelength between 630 an d 680 nm and is powe red by tw o AAA
are included. A touch button can be found on the side of the pointer.
Press this button to turn the laser on.
Lasers and lase
r pointers ha ve many uses in science c ourses:
The Laser Pointer has many uses when combined with the Vernier Photogate. The
gate has two det ectors. One detect or, on the inside of the phot ogate,
allows you to use the photogate in a no
rmal arrangem ent; e.g. measure the tim e
that the gate is
blocked as an object passes thr ough the pho togate. The sec ond
detector on the
outside of the ph otogate can be used with a laser t o produce a gate
that is wider t
han the norm al 7.5 cm spacing. This wi de photogate ha s many
applications. For example:
You can set u p a photogate wi de en ough to measure the s peed of an
e or a person. You could e ven measure hand spee d during a
You can set up a photogate and the Laser Po inter close to the ground. A
person standing in the beam will block the gate. When he jumps vertically,
his hang time can be measure
d by the unblocki ng of the photogate.
Using the arra ngement desc ribed above, y ou could drop a ball into the laser
beam. As it b
ounces in the beam, y ou can use the blocking and unblocking
events to calculate the coefficien
t of restitution and dwell time.
You can verify the shutter speed of a film camera by letting the beam pass
through the lens and
out th e back of the camera.
You can m easure the speed of a motor by determi ning the interr uptions of a
beam caused by
the light passi ng through s pokes in a whee l.
The Laser Poin ter can be used with in terference kits to observ e interference
patterns. When use
d with a data collecti on in terface and sensors, inte nsity patterns
can be recorde
d. A simple way to do thi s was describe d by Andr ew DePino J r. in
The Physics Teacher
(“Diffraction Patterns Using a Constant Velocity Cart”, The
, 40 , 418-419 (Oct ober 200 2). In the arti cle, he descri bes how to
attach a Vernier Light Sensor to a constant velocity car. As the car moves
larly through the beam, the graph of ligh t intensity vs . time
ates a graph of light intensi ty vs . dist ance. To take t he experim ent one
step further, y
ou can directly measure light i ntensity vs . di stance data by
combining a Light Sensor with a
Rotary Motion Sensor.
Use the Laser Pointe r to observe laser radiat ion. The radiation can be made
visible in air by clapping two chalkboard er
asers in the beam to create a cloud of
- As with any laser, caution must be ex ercised when using the la ser pointer.
The Laser Pointer emits laser radiation, and therefore, should not be pointed at the
eye. Pay special attention to the location of
the aperture, which is on the same end of
the pointer as the clip
. A caution label can also be found on this end of th e pointer.
Direct eye contact with the laser
beam may cause serious injury. Students shoul d be
reminded that this is
not a toy, and it sh ould be kept out of reach of children.
To install the batteries, remove the end cap of the pointer (the end opp
aperture). Install the 2 AAA batteries w
ith the positive (+) end of the batteries
pointing toward the op
en end of the case. After replacing the end cap, test the poin ter
by pointing the aperture toward
a wall and pressing the ON/OFF touch button on the
side of the pointer.
A Laser Pointer Sta
nd is available from Ve rnier Software & Technology (orde r code
The stand pro vides a conven ient way to m ount the Laser Pointer. It
the laser in place and even hol ds the po wer button down for ease of use during
Vernier Software & Technology
13979 S.W. Millikan Way
Beaverton, OR 97005-2886
Toll Free (888) 837-6437
(50 FAX (503) 277-24 3) 277-2299 40
Printed on recy