New (overstock / surplus) Melles Griot Inc. Helium-Neon Laser Tubes.
All tubes emit a Gaussian TEM00 beam unless otherwise noted.
Power supplies and ballast resistors also available.
Quantities are limited!
Typical lifespan of a Melles Griot He-Ne laser tube is 20,000 hours.
Six month warranty.

Also Available:
05-LHP-503
05-LYR-006: multi-mode, 0.1mW min.
05-LHP-064
05-LHR-178
05-LHP-156
05-LGR-332
05-LHR-302
05-LHR-079
and more...

Wavelength: 632.8 nm commonly referred to as 633nm red:

Wavelength: 543.5 nm green He-Ne laser tubes:

Laser Tube:

05-LGR-323

Power: TEMoo

0.30 mW minimum

Beam Diameter:

  

Beam Divergence:

 

Polarization

Random

Mode spacing:

 

Operating Voltage:

1850V

Recommended Ballast:

K ohm

Current:

5.0 mA

Beam Output End:

 

Length:

 in / mm

Diameter:

 in. / mm

Price:

$149.00 Buy Now

Model

Power
(min.)

Power
(typical)

Beam
Diameter

Beam
Divergence

Polarization

Operating
Voltage

Preferred
Ballast
Resistance

Operating
Current

Beam Output End

Mode Spacing

Length
in. / mm

Diameter
in. / mm

Purchase
add to cart

05-LHR-420

0.6 mW

TBD

0.85 mm

0.95 mRad

Random

1260V

68 - 75K

4.5mA

Cathode

787 Mhz

7.82 in
198.6mm

1.12 in
28.5mm

$145.00
Buy Now

05-LHR-080

2.0mW

2.6mW

0.72 mm

1.11 mRad

Random

1810V

68 - 75K

6.5 mA

Cathode

607 Mhz

10.04 in
255.0mm

1.12 in
28.5mm

$180.00
Buy Now

05-LHP-080

2.0mW

TBD

0.72 mm

1.11 mRad

>500:1

1810V

68 - 75K

6.5 mA

Cathode

607 Mhz

10.04 in
255.0mm

1.12 in.
28.5mm

$180.00
Buy Now

05-LHP-122

1.8mW

2.1mW

0.63 mm

1.28 mRad

>500:1

1750V

68 - 75K

5.5 to
6.5mA

Cathode

687 Mhz

8.99 in
228.4mm

1.45 in.
36.8mm

$97.00
Special

05-LHP-660

0.5mW

TBD

0.47 mm

1.70 mRad

>500:1

1150V

68 - 75K

4.5mA

Cathode

1219 Mhz

5.13 in.
130.3mm

1.00 in.
25.4mm

$145.00
Buy Now

05-LHR-099

0.8mW

TBD

0.76 mm

2.70 mRad

Random

1190V

91K Ohm

3.7mA

Anode

638 Mhz

9.57 in.
243.1mm

1.12 in.
28.5mm

$135.00
Buy Now

05-LHR-009

2mW

2.5mW

0.55 mm

1.47 mRad

Random

1940V

100K Ohm

4.5mA

Cathode

822 Mhz

7.50 in.
190.5mm

1.00 in.
25.4mm

$170.00
Buy Now

05-LHR-097

2mW

2.6mW

0.76 mm

1.06 mRad

Random

1570V

75K Ohm

4.5mA

Anode

638 Mhz

9.57 in.
243.1mm

1.12 in.
28.5mm

$180.00
Buy Now

05-LHR-004

0.6mW

0.9mW

0.47 mm

1.7 mRad

Random

1430V

80K Ohm

4.0mA

Cathode

1078 Mhz

5.74 in.
145.8mm

1.00 in
25.4mm

$145.00
Buy Now

05-LHR-004-487

0.5mW

0.6mW

0.47 mm

1.7 mRad

Linear

1430V

80K Ohm

4.0mA

Cathode

980Mhz

6.14 in.
156mm

1.00 in
25.4mm

$150.00
Buy Now

05-LHR-082

2.7mW

3.4mW

0.58 mm

1.41 mRad

Random

1810V

80K Ohm

4.5mA

Cathode

694 Mhz

8.90 in.
226.1mm

1.12 in.
28.4mm

SOLD-OUT

05-LHP-050

5mW

TBD

0.80 mm

1.0 mRad

>500:1

2340V

68 - 75K

6.5mA

Cathode

438 Mhz

13.80 in.
350.5mm

1.12 in.
28.5mm

$305.00
Buy Now

05-LHR-160

7mW
multimode

TBD

1.7mm

2.5 mRad

Random

1900V

68K Ohm

6.5mA

Cathode

NA

13.80 in.
350.5mm

1.45 in.
36.8mm

$225.00
Buy Now

Laser Tube:

05-LGR-332

Power: (multi-mode)

0.30 mW minimum

Beam Diameter:

   1.0 mm

Beam Divergence:

1.6 mRad

Polarization

Random

Mode spacing:

 

Operating Voltage:

1210V

Recommended Ballast:

K ohm

Current:

5.25 mA

Beam Output End:

 

Length:

 10.68 in

Diameter:

 1.45 in

Price:

$129.00 Buy Now

HeNe laser tubes are ideal for:
Holography
Raman spectroscopy
Low level laser therapy
Test and measurement
Physics demonstrations for classrooms and science fair projects.

Glass He-Ne Laser Tubes

Helium-Neon gas lasers require a ballast resistor in order to operate properly.  HeNe laser heads have the ballast resistor built-in to the cylindrical metal enclosure; however bare glass HeNe tubes need one to be provided.

Wire wound resistors are the most reliable, and therefore the best choice for use as a ballast. Carbon composition resistors are an ideal choice for lower current requirements: 4.5mA and below. They are also more economical than wire wound resistors.  Carbon film and metal film resistors are definitely not recommended. They have a tendency to degrade due to the high transient currents inherent to the laser starting process.

Selecting the proper ballast resistor based on wattage is very important. To prevent the least expensive component in the laser system from becoming the weakest link, it is recommend to choose a resistor wattage that exceeds the formula P=I2R by 10% or more. This component will be exposed to a high temperature environment and high voltage pulses during starting which can place it under constant stress. When connecting the ballast to the tube, it is important to insulate it properly. There is usually greater than 10,000VDC between the ballast and ground during the start-up of the tube.

Most tube manufacturers recommend mounting the ballast resistor less than three inches from the anode. This reduces stray capacitance between the anode and cathode. The stray capacitance is a physical phenomenon, parasitic in nature, and results from a capacitance that is created by the anode acting as one plate, air acting as the dielectric and ground acting as a second plate.

The connection between the anode and ballast can be one of the most critical in any laser system. A HeNe laser tube acts as a negative resistive load. As the current increases through the load, the voltage drop decreases. This negative resistance is typically 40K to 50K ohms. In order for the power supply to see a normal load, it is necessary for the ballast resistance when added to the negative resistance of the tube, have a net positive resistance of approximately 25k ohms or more. This net positive resistance may have to be increased to reduce the effects of the stray capacitance on the anode of the tube. As the stray capacitance increases, three things happen. The anode draws current from the power supply. It reduces the voltage drop on the tube, and it reduces the impedance at the anode. These three factors create a relaxation oscillator. When this happens it causes the ionized gases to extinguish. At that time the power supply sees no load, applies a high voltage to ionize the gases again and starts the cycle over.

Choosing the correct ballast resistor is an important  step in making your laser work propery. Use the value of resistor that is recommended. We offer a variety of 5 Watt wire-wound resistor values to meet the needs of most HeNe lasers under 15mW.

REQUIRED BALLAST RESISTOR:

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68K Ohm, 5Watt

75K Ohm, 5Watt

82K Ohm, 5Watt

100K Ohm, 5Watt

Wire-Wound
Ballast Resistors
$3.00 each

He-Ne Laser Tubes

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