Analog laser power probes

From Macken

Each power probe is a self-contained unit consisting of an absorbing head, a temperature measuring mechanism, a zeroing knob and a readout dial. In operation, the dial is zeroed. Then the absorbing head on the end of the Power Probe is exposed to the laser beam for a specified time interval. After the Power Probe has been removed from the laser beam, the average laser power can be read out on the dial. The process takes about one minute. If it is necessary to make several power measurements in succession, the absorbing head can be rapidly cooled by immersing in a beaker of water between measurements.

Conveniently size of absorbing head
One minute to make a laser power measurement
Very tough absorbent coating
Easy zero adjustment mechanism
Long-life all-metal construction

Accuracy [%] for all ±5

Repeatability [%] for ±1.5

ModelPower Range [W]Demage Thershold [W/cm2]Exposure Time [s]Division [W]Absorbing Head [cm]Length [cm]Weight [g]
P20Y0-203000300.24.58 x 2.542289
P50Y0-503000200.54.58 x 2.54 2298
P100Y/0-10030002015.08 x 3.1822120
P100C0-100100002015.08 x 3.1822120
P200Y0-20025002025.08 Ø22157
P200C0-20070002025.08 Ø22157
P500Y0-50020002055.08 Ø22183
P500C0-50040002055.08 Ø22183
P1000Y0-1000175020106.35 Ø22287
P1000C0-1000250020106.35 Ø22287
P2000Y0-2000120020207.62 Ø 22522
P2000C0-2000150020207.62 Ø 22522
P4000Y0-400090020258.89 Ø28753
P4000C0-4000110020258.89 Ø28753
8.89 Ø281144
8.89 Ø281144
Wavelength for Y-Models: 900 - 1250 nm, Wavelength for C-Models 8 - 11 µm

Conical Laser Power Probes for high power density

Conical Head Power Probes are used to measure high power density CO2 laser beams which may damage the standard flat surfaced Power Probes. The conical absorbing cavity exhibits a high heat dissipation.

There are three models of Conical Power Probes: C2K, C4K and C10K. Table 1 below gives specifications for these models. Table 2 gives approximate damage threshold for both the flat surface and conical power probes.

Conical Power Probe Specifications
Primary Power Range [W]0 - 2000
(20 sec)
0 - 4000
(20 sec)
0 - 10000
(10 sec)
Alternative Power Range [W]--0 - 5000
(20 sec)
Absorbing Head, Ø [cm]6,27,07,6
Conus, Ø [cm]5,085,76,35
Weight [g]53510001160
Accuracy [%]±5%±5%±5%
Repeatability [%]±1.5%±1.5%±1.5%

Explanation of Damage Threshold

High power lasers that can cut metal can also damage the absorbing head of a power probe if the beam is too concentrated. It has been found that it is not possible to quote a single number for the power density that will damage a power probe. The damage threshold is also a function of the total power in the beam and whether the absorbing head is moved during the exposure.

For a CO2 laser, there is no loss in absorbtivity (no damage) when the coating is heated to the point where it exhibits a visible bleached spot but no other change. There is damage when metallic areas can be seen on the surface. In operation, power densities should be kept substantially below the indicated damage threshold.

Approximate Damage Threshold
Power in a CO2 laser beam [W]Exposure Time [s]Flat Probes1 [W/cm2]Conical Probes2 [W/cm2]
1 Model P500C, P1000C, P2000C, P10KC, H3C and H4C
2 Model C2K, C4K and C10K


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