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Tag: optics

Viewing Spectral Lines in Discharge, Other Colours in Output

For accurate measurements, you’ll need an optical instrument such as a monochromator or spectrophotometer or optical spectrum analyzer. But to simply see the complexity of the discharge spectrum inside the bore of a He-Ne laser tube, it’s much easier and cheaper. (Spectra for various elements and compounds can be easily

Continue readingViewing Spectral Lines in Discharge, Other Colours in Output

Demonstration He-Ne Lasers, Weatherproofing

Putting Together a Demonstration He-Ne Laser For a classroom introduction to lasers, it would be nice to have a safe setup that makes as much as possible visible to the students. Or, you may just want to have a working He-Ne laser on display in your living room! Ideally, this

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Internal Mirror He-Ne Tubes up to 35 mW – Red and Other Colours

Typical He-Ne Tube Specifications Prior to the introduction of the CD player, the red He-Ne laser was by far the most common source of inexpensive coherent light on the planet. The following are some typical physical specifications for a variety of red (632.8 nm) He-Ne tubes (all are single transverse

Continue readingInternal Mirror He-Ne Tubes up to 35 mW – Red and Other Colours

He-Ne Laser Tubes, Heads, Structure, Power Requirements, Lifetime

Early Versus Modern He-Ne Lasers In the first He-Ne lasers (see the diagram below), exciting the gas atoms to the higher energy level was accomplished by coupling a radio frequency (RF) source (i.e., a radio transmitter) to the tube via external electrodes. Modern He-Ne lasers almost always operate on a

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Applications of a 1mW Helium-Neon Laser

There are many uses for even a 1 mW helium-neon laser. Most of these same sorts of things can also be done with a collimated diode laser (though some laser diodes may not have the needed coherence properties for applications like interferometry and hologram generation). Below are just a few

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Cat Links Bare Silicon, Hacks, Personal Project, RasPi

IC Decapping: The Process

Posted on February 20, 2016December 22, 2018 The Engineer

As I’ve been posting some photos of decapped ICs lately, I thought I’d share the process I use personally for those that might want to give it a go 😉 The usual method for removing the epoxy package from the silicon is to use hot, concentrated Nitric Acid. Besides the

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Cat Links Consumer Gear, Lasers, Randoms

Vintage Optical Block

Posted on July 22, 2012July 22, 2012 The Engineer

I thought this would be of interest, as it’s from a drive circa 2001, (DVD-CD-RW). It’s the biggest & most complex optical block I’ve ever seen, with totally separate beam paths for the IR CD beam & the visible DVD beam. It also combines the use of bare laser diodes

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Cat Links Computer Gear, Lasers

Cisco 2G Fibre Channel SFP Module

Posted on July 8, 2012 The Engineer

Here is a 2Gbit Fibre Channel transceiver from Cisco Systems in SFP module format.             Here the shield has been removed from the bottom of the module (it just clips off). The bottom of the PCB can be seen, with the copper interface on the

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Cat Links Computer Gear

ICL Barcode Scanner

Posted on August 2, 2010 The Engineer

An ICL barcode scanner from the 80s is shown here. This is the top of the unit with cover on. Plastic cover removed from the unit showing internal components. Main PSU on left, scan assembly in center. Laser PSU & Cooling fan on right. Laser tube at top. Closeup of

Continue readingICL Barcode Scanner

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  • Helium Neon Lasers
    • He-Ne Lasers – Introduction
    • Applications of a 1mW Helium-Neon Laser
    • He-Ne Laser Safety
      • Laser Safety Classifications
    • Theory of Operation, Modes, Coherence Length
    • He-Ne Laser Tubes, Heads, Structure, Power Requirements, Lifetime
    • Power Requirements for He-Ne Lasers
      • Modular He-Ne Laser Power Supply
    • Wavelengths, Beam Characteristics
    • Magnets in High Power or Precision He-Ne Laser Heads
    • Internal Mirror He-Ne Tubes up to 35 mW – Red and Other Colours
    • Viewing Spectral Lines in Discharge, Other Colours in Output
    • Demonstration He-Ne Lasers, Weatherproofing
    • Interesting, Strange, and Unidentified He-Ne Lasers

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