Power and Intensity Measurement Experiment

The first part of the experiments consists of measuring the power of a green laser diode (DPSS) and a yellow LED. The experimental verification of the power decreasing as 1/r2 with distance is carried out. The second part deals with beam profile, which can be deduced from the power transmitted through an adjustable iris diaphragm. Optionally (reference 204831), a pulsed laser diode and a suitable detector will allow addressing concepts related to pulses and associated powers. Topics covered: - Optical power and intensity of a collimated green continuous laser - Optical power and intensity of a yellow LED - Dependence of intensity on distance, verification of the 1/r2 relationship - Measurement of average power of a pulsed laser source - Measurement of pulse width and repetition rate - Peak power and energy of a laser pulse Principles and objectives: The power of electromagnetic radiation (or light flux) corresponds to the amount of energy emitted by the source in one second, while light intensity (or irradiance) relates power to surface unit. Therefore, with constant power, the intensity of a light source can vary depending on the geometric parameters of the beam. To demonstrate and quantitatively verify these relationships, the experimental setup uses two light sources with very different beam geometric shapes. Power and intensity measurements are performed with a wattmeter, and an adjustable iris diaphragm allows for varying the beam section. In addition (204831), a light source (laser diode) with nanosecond pulses and a fast detector allow studying other characteristics such as average power, peak power, pulse width, and repetition rate.

Composition:
▪ 1 optical rail 1 m, with graduated ruler
▪ 1 green laser diode 532 nm mounted on a slider
▪ 1 green laser diode controller
▪ 1 yellow LED mounted on a slider
▪ 1 LED controller
▪ 1 collimation optic with support on a slider
▪ 1 iris diaphragm with support on a slider
▪ 1 optical power meter with support on a slider
▪ 1 digital multimeter
▪ 1 set of experiment instructions (in English)