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Homebrew Lasers. Florian Gahbauer. OSA Latvia Student Chapter Seminar November 5, 2007. Disclaimer.

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Homebrew lasers l.jpg

Homebrew Lasers

Florian Gahbauer

OSA Latvia Student Chapter Seminar

November 5, 2007

Disclaimer l.jpg

I myself have never made or attempted to make any of the devices described in this presentation or anything like them. Everything that I know about this devices I learned from the internet. Thus, I cannot guarantee the accuracy or safety of the designs. The purpose of this presentation is to present interesting ideas and perhaps stimulate future projects, but anyone attempting to realize these projects will have to take responsibility for their own safety.

At the same time, I have tried to give credit where credit is due, by including links. I apologize, if I have failed to acknowledge any sources of information.

Slide3 l.jpg


Construction and operation of any laser device is hazardous. Do not attempt to construct or operate a laser without adequate safeguards and safety practices. Most lasers involve high voltages, toxic chemicals, high vacuum, laser radiation and other hazards. The author specifically disclaims any and all liabilities associated with the construction and use of such devices. Designs presented here are in the interests of providing information on operational principles only and do not represent safe nor ANSI safety compliant designs.


Outline l.jpg

  • Basic principles of lasers

  • The Nitrogen TEA Laser

  • Different examples of N2 TEA Lasers

  • High Voltage supplies

Basic principles of lasers 1 population inversion l.jpg
Basic Principles of Lasers (1):Population Inversion



Basic principles of lasers 2 stimulated emission l.jpg
Basic Principles of Lasers (2):Stimulated Emission


Typical laser schematic l.jpg
Typical Laser Schematic


The tea nitrogen laser l.jpg
The TEA Nitrogen Laser

  • Medium: Nitrogen gas (N2)

  • Pump: electric discharge

  • Resonator: not needed


N 2 tea laser schematic l.jpg
N2 TEA Laser Schematic


N 2 laser circuit schematic l.jpg
N2 Laser Circuit Schematic


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Advantages of the TEA N2 Laser

  • Can operate in air (72% nitrogen)

  • No optics required

    • Amplification of nitrogen is very high

    • Significant reduction in cost and complexity

  • No vacuum required

  • Parts are generally inexpensive

Disadvantages of the tea n 2 laser l.jpg
Disadvantages of the TEA N2 Laser

  • Timing of spark pulse is critical: ns

    • Upper state lifetime: t[ns] = 36/(1+P[torr]/58)

  • Beam profile is not so good and small

    • Hard to use as dye laser pump (1.5mm-2mm)

  • Light output is in UV (337.1 nm)

    • (but fluorescence visible on paper)

  • Some people recommend the N2 laser in vacuum

    • Less critical electronic requirement

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Possible Parts List

+ HV supply


Nitrogen laser by thomas rapp http pulslaser de l.jpg
Nitrogen Laser by Thomas Rapp(http://pulslaser.de)

Prof csele s basic tea laser http technology niagarac on ca staff mcsele lasers laserstea htm l.jpg
Prof. Csele’s Basic TEA Laserhttp://technology.niagarac.on.ca/staff/mcsele/lasers/LasersTEA.htm

Jarrod kinsey s tea laser http www jarrodkinsey com pages howtobuild html l.jpg
Jarrod Kinsey’s TEA Laserhttp://www.jarrodkinsey.com/pages/howtobuild.html

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Some Critical Issues

  • Timing of discharge circuit

    • Must be very fast (<2.5 ns at P=1atm)

    • Therefore, must avoid stray inductance in capacitors

  • Alignment of Electrodes

    • Electrodes must be aligned to within micrometers (according to one source)

  • Smoothness of Electrodes

    • Electrodes must be smooth to avoid discharges at sharp edges

Nitrogen tea lasers in operation l.jpg
Nitrogen TEA Lasers in Operation

  • Tour of Homemade TEA Laser


  • Rapid-firing TEA laser http://www.youtube.com/watch?v=fOcC7FOy0qA

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High Voltage Supplies

  • Laboratory High Voltage Supply

  • Laser printer HV supply

  • Ignition coil circuit

  • Fly-back transformer (from TV) circuit

  • Electrostatic generator

  • Flash transformer (from disposable camera)/Cockroft-Walton multiplier

    • Caution: Camera flash circuits can store dangerous amounts of energy in capacitors

Fly back transformer l.jpg
Fly-back Transformer


Fly back transformer circuit l.jpg
Fly-back Transformer Circuit


Ignition coils l.jpg
Ignition Coils


Ignition coil circuit l.jpg
Ignition Coil Circuit


Cockroft walton multiplier l.jpg
Cockroft-Walton Multiplier


Cockroft walton multiplier and neon sign transformer l.jpg
Cockroft-Walton Multiplier and Neon Sign Transformer


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Electrostatic Generator

  • http://www.jarrodkinsey.com/pages/howtobuild.html

Dangers l.jpg

  • Laser radiation

    • 337.1 nm is in UV, i.e., invisible

  • High Voltage

    • 20 kV but only a few mA

    • Careful of energy stored in capacitors

  • Spark Gap

    • UV

    • Noise: noise can be more damaging than it sounds. Enclose the spark gap or use ear protection

Links l.jpg

  • Professor Csele’s Site http://technology.niagarac.on.ca/staff/mcsele/lasers/LasersTEA.htm

  • Sam’s Laser FAQ http://repairfaq.ece.drexel.edu/sam/laserfaq.htm

  • Jarrod Kinsey’s Site http://www.jarrodkinsey.com/pages/howtobuild.html

  • Thomas Rapp’s Site


More information l.jpg
More Information