Here is an analysis of a set of images that do not meet the ISO 11146 requirements for determining M² (because the image locations are not taken in right locations relative to the focus). These beam images are from a HeNe laser with slightly misaligned mirrors to primarily lase in a TEM₀₁ transverse mode. The laser resonator had a fixed rotation of 38.7° from the plane of the optical table.:

Spot size oflaser beamformula

Determining M² for a laser beam is also straightforward. Just collect beam diameters from five beam locations within one Rayleigh distance of the focus and from five locations more than two Rayleigh distances:

Beam diametercalculator

– Only alarm when there is human activity, making it more precise! (Reduce the nuisance alarms caused by the wind, glass or animal, AI Human Detection service are provided and charged by third party).

1/e2beam diametercalculator

In the graph on the below right, the dashed line shows the expected divergence of a pure gaussian beam. Since real beams should diverge faster than this (not slower) there is some problem with the measurements (too few!). On the other hand, the M² value the semi-major axis 2.6±0.7 is consistent with the expected value of 3 for the TEM₁₀ mode.

– If you worry in the event that your camera is stolen or files corrupted in micro SD additional paid cloud storage is available (Cloud storage service are provided and charged by third party).

Gaussianlaser beam diameter

Laser beam diametercalculator

2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.

Laser beamdivergence and spot size

– When micro SD card is inserted, the camera will automatically store surveillance video. An 8G micro SD card can store up to 2 days recording, an 128G micro SD card can store up to one month of recording.

– The recordings saved on micro SD card can be watched on computer with a card reader or directly watch on mobile phone. The recordings saved on Cloud storage can be downloaded and watch directly on mobile phone.

This module also supports M² calculations based on a series of images collected at various distances from the focused beam.

Simple and fast calculation of beam sizes from a single monochrome image based on the ISO 11146 method of variances. Some effort has been made to make the algorithm less sensitive to background offset and noise.

– When an moving object is detected within the camera’s recording range, the camera will start recording and send an alert to APP on mobile.