Quick Answer: The Modulated Laser Receiver Unit is a self-contained receiver with an opto-detector coupled to a wide band amplifier, used to demonstrate information carried by a modulated laser beam and for simple speed of light determinations.
Last updated: October 2026
Key Features
Opto-detector and amplifier frequency response from 100 Hz to 5 MHz
Miniature speaker gives an audible signal for modulation frequencies in the audio range
Powered by a 9V PP3 battery, with an ON/OFF switch
Measures 120 mm x 65 mm x 35 mm
Suitable for the Semiconductor Laser and Solid State Laser, both available separately
Technical Specifications
Specification
Value
Detector
Opto-detector with wide band amplifier
Frequency response
100 Hz to 5 MHz
Power
9V PP3 battery
Switch
ON/OFF
Dimensions
120 mm x 65 mm x 35 mm
About This Product
Light from a modulated laser is picked up by the opto-detector and amplified, so the transmission of information along the beam can be shown to a class. When the modulation lies within the audio frequency range, the result can be heard through the miniature speaker. The same unit is used for simple speed of light determinations.
Frequently Asked Questions
Q1. Is the built-in speaker loud enough for a class demonstration? The miniature speaker gives an audible signal for audio-range modulation. If demonstration-level volume is needed, a separate amplifier/speaker system is recommended.
Q2. Which lasers can be used with this receiver? It is suitable for the Semiconductor Laser and the Solid State Laser, both available to purchase separately.
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