Quick Answer: The Dual Colour Laser is a Class 2 semiconductor laser with two independently controlled diodes, red and 532 nm green, whose diffraction patterns through a double slit can be shown one above the other for comparison.
Last updated: October 2026
Key Features
Two independently controlled laser diodes: red and 532 nm green
Both beams can pass through a double slit slide at the same time
Internal 1 MHz modulation for speed of light determination with a laser receiver and oscilloscope
External modulation input for audio from a smartphone or mp3 player
Removable key prevents unauthorised use
Supplied with a 9 V power supply and full instructions
Technical Specifications
Specification
Value
Power output
<1mW max.
Laser class
Class 2
Wavelengths
Green 532nm (+/-5nm), red 655nm (+/-5nm)
Beam divergence
1.5mRad, green and red
Modulation
1MHz internal, audio frequencies external
Input voltage
External 9V D.C. power supply, +ve pin (included)
Dimensions
(L)150mm x (W)110mm x (H)65mm
Weight
390g
About This Product
Passing both beams through a double slit slide at once displays the red and green diffraction patterns one above the other for immediate comparison. Using the internal 1 MHz modulation with the laser receiver and an oscilloscope, the speed of light can be determined in the laboratory, and an external source can modulate the laser to send audio to the receiver.
Frequently Asked Questions
Q1. How is unauthorised use prevented? The laser is switched on with a removable key, which prevents unauthorised use.
Q2. What laser class is it? It is a Class 2 laser with a maximum power output below 1 mW.
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