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He-Ne Laser - Modulated 2.0 mW / Class IIIa
High-powered laser for multi-purpose use including audio transmission demonstrations

The ML 800 series of lasers is a tried and true laser design originally manufactured by Metrologic. Industrial Fiber Optics is proud to continue producing this outstanding line of lasers, incorporating our own improvements. we are very proud at Industrial Fiber Optics to continue producing this outstanding line of lasers. Designed with a sturdy metal enclosure and along the lines of classic laser design with integrated power supply this laser is an excellent choice for an industrial or educational application.

The ML 869A is a Class IIIa laser which is one of the most popular power classes used in educational institutions. It shares the features of the ML 800 series and adds the capability for amplitude modulation of the laser beam intensity at audio frequencies. It is unquestionably the best red light-producing laser in the product line.

The increased brightness can also help students make better holograms. Small movements or vibrations are less likely to blur the picture with the ML 869A's shorter exposure time.

  He-Ne Laser - Modulated

Part Number: ML 869A 
Price: $581.83
Operators Manual

See Operators Manual for further details on specifications, electrical jacks/plugs and set-up specific instructions

Other products for use with this laser:

Laser receiver with microphone XY Pattern Generator


  • Hard-seal laser tubes for long life
  • Shock-resistant mountings
  • Durable extruded aluminum housing that protects the laser tube and power supply components
  • Two-year limited warranty
  • Solid-state integrated power supply mounted on durable printed circuit board
  • Standard threaded hole for tripod or optical bench mounting
  • Mechanical slide shutter over front aperture to block beam without having to turn off power supply (as required by CDRH)
  • Rear end cap with power switch indicator lamps, fuse holder and line cord with 3-prong grounded plug
  • Full-length rubber strips on the underside to prevent scratching and slipping on polished surfaces
  • Labels and safety features to meet all U.S. CDRH regulations
  • Power requirements 105 - 125 VAC 60 Hz
  • 220 VAC upon request. Click Here to see what is available. Then select the part number required.

Suitable for experiments such as:

  • Optical refraction and reflection demonstrations
  • Tyndall's light-guiding-in-water experiments
  • Scattering of Light
  • Critical angle determination in materials
  • Convergence and divergence of lenses
  • Audio transmission demonstrations
  • Creation of holograms


All manufacturers of lasers used in the United States, must conform to regulations administered by the Center for Devices and Radiological Health (CDRH), a branch of the U.S. Department of Health and Human Services. CDRH categorizes lasers as follows:

 Class 1

A laser or laser system which does not present a hazard to skin or eyes for any wavelength or exposure time. Exposure varies with wavelength. For ultraviolet, .2 to .4m exposure is less than from .8 or near IR, the exposure is < 200w. Consult CDRH regulations for specific information.

 Class 2

Any visible laser with an output less than 1 mW of power. Warning label requirements yellow caution label stating maximum output of 1 mW. Generally used as classroom lab lasers, supermarket scanners and laser pointers.

 Class 3a

Any visible laser with an output over 1 mW of power with a maximum output of 5 mW of power. Warning label requirements red danger label stating maximum output of 5 mW. Also used as classroom lab lasers, in holography, laser pointers, leveling instruments, measuring devices and alignment equipment.

 Class 3b

Any laser with an output over 5 mW of power with a maximum output of 500 mW of power and all invisible lasers with an output up to 400 mW. Warning label requirements red danger label stating maximum output. These lasers also require a key switch for operation and a 3.5-second delay when the laser is turned on. Used in many of the same applications as the Class IIIa when more power is required.

 Class 4

Any laser with an output over 500 mW of power. Warning label requirements red danger label stating maximum output. These lasers are primarily used in industrial applications such as tooling, machining, cutting and welding. Most medical laser applications also require these high-powered lasers.

 CDRH Classification  Class IIIa
 Polarization  Random
 Laser Emission Color  Red
 Laser Mode  TEM00
 Operating  Unit  Value
 Input Voltage  V 110
 Input Current  mA 80
 Wavelength  nm  632.8
 Optical Output Power, Nominal  mW  2.0 mW /
 Power, (min/max)  mW  1.1 / 3.5
 Beam Diameter  mm  0.49
 Beam Divergence  mRad  1.65
 Digital Modulation  MHz n/a
 Analog Modulation  Hz to MHz n/a
 Mechanical  Unit  Value
 Operating Temperature  ° C  0 - 50
 Housing  cm  32.8 x 7.2 x 7.4