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Abstract:
This video explores several infrared laser modules acquired to expand a "rainbow of lasers" collection, focusing on wavelengths between 670nm and 980nm. The creator tests a 780nm laser, revealing this wavelength's surprising commonality as the standard for CD players, and measures both a module and a player's laser. A 980nm module is tested, found to be an outlier at ~970nm with significant power (324mW), though less than advertised. The main focus shifts to a seemingly inexpensive 850nm laser advertised at 1 Watt. This laser also proves to be an outlier wavelength (~859nm) but surprisingly exceeds its power rating, measuring ~1.2 Watts, making it the creator's first Class 4 infrared laser. The low visibility of its powerful beam is explained using Rayleigh scattering (similar to why sunsets are red). The video concludes with a surprising discovery: the 1.2W laser emits ten distinct beams ("decabeam") in an unusual pattern, a phenomenon the creator has never encountered before and seeks explanations for.
Infrared Laser Tests: Common Wavelengths, Power Surprises, and a Mysterious Decabeam
0:00 Introduction: The goal is to test new infrared (IR) lasers to fill gaps in a collection, promising surprising findings, including a common color and a demonstration of Rayleigh scattering.
0:40 780nm Laser Tested: A new laser module is measured using a spectrometer, confirming its wavelength at 783nm.
1:27 780nm is Common: This "deep red" (barely visible) or infrared wavelength is identified as the standard laser color used in all CD players.
1:48 CD Player Laser Measured: The laser inside a functional portable CD player is measured and found to be 789nm, confirming the commonality.
3:16 CD Burner Laser Disappoints: A 780nm laser diode module advertised with a 100mW continuous wave (CW) rating (often used for CD burning) is tested.
3:40 Power Measurement (780nm): The module only outputs 50mW, half of its advertised potential.
4:03 980nm Laser Introduced: A new module (980T-500) advertised potentially up to 500mW is introduced.
4:20 Wavelength Measurement (980nm): Spectrometer shows it's an outlier, lasing at ~969nm, making it a new distinct wavelength for the collection rather than just a stronger 980nm.
4:53 Power Measurement (970nm): The laser outputs 324mW. While significantly less than the potential 500mW, it becomes the creator's strongest IR laser, surpassing the previous 178mW 808nm laser.
5:26 1 Watt 850nm Laser Introduced: A very inexpensive laser advertised at 850nm and 1000mW (1 Watt) is presented with skepticism about its actual power.
7:11 Wavelength Measurement (850nm): This laser is also an outlier, measuring at 859nm.
7:35 Beam Visibility Check: Using the camera's nightshot mode (IR filter removed), the beam appears relatively faint in the air despite its supposed power.
8:17 Power Measurement (859nm): Surprisingly, the laser measures 1191mW (~1.2W), exceeding its advertised power and becoming the creator's first Class 4 infrared laser.
9:07 Rayleigh Scattering Explanation: The low visibility of the powerful 1.2W beam is explained by Rayleigh scattering β longer wavelengths like infrared scatter much less in air compared to shorter wavelengths (like blue light), meaning less light scatters sideways towards the camera. This is the same reason the sky appears blue (scattered short wavelengths) and sunsets appear red (less scattered long wavelengths passing through more atmosphere).
10:10 Decabeam Discovery: The 1.2W laser doesn't produce a single beam but rather ten distinct, parallel beams arranged in two groups of five with a central gap.
10:33 Unprecedented Beam: The creator has never seen this "decabeam" pattern before and speculates it might be from an unusual diode structure (e.g., multiple emitters) or a strange TEM mode, requesting audience input.