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Our partner Macken

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.

Features
  • 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

Specification

Accuracy [%] for all ±5

Repeatability [%] for ±1.5

Model Power Range [W] Demage Thershold [W/cm2] Exposure Time [s] Division [W] Absorbing Head [cm] Length [cm] Weight [g]
P20Y 0-20 3000 30 0.2 4.58 x 2.54 22 89
P50Y 0-50 3000 20 0.5 4.58 x 2.54 22 98
P100Y/ 0-100 3000 20 1 5.08 x 3.18 22 120
P100C 0-100 10000 20 1 5.08 x 3.18 22 120
P200Y 0-200 2500 20 2 5.08 Ø 22 157
P200C 0-200 7000 20 2 5.08 Ø 22 157
P500Y 0-500 2000 20 5 5.08 Ø 22 183
P500C 0-500 4000 20 5 5.08 Ø 22 183
P1000Y 0-1000 1750 20 10 6.35 Ø 22 287
P1000C 0-1000 2500 20 10 6.35 Ø 22 287
P2000Y 0-2000 1200 20 20 7.62 Ø 22 522
P2000C 0-2000 1500 20 20 7.62 Ø 22 522
P4000Y 0-4000 900 20 25 8.89 Ø 28 753
P4000C 0-4000 1100 20 25 8.89 Ø 28 753
P10KY 0-5000
0-10000
750 20
10
50
100
8.89 Ø 28 1144
P10KC 0-5000
0-10000
900 20
10
50
100
8.89 Ø 28 1144
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
Model C2K C4K C10K
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] 6,2 7,0 7,6
Conus, Ø [cm] 5,08 5,7 6,35
Weight [g] 535 1000 1160
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]
100 20 10000 15000
200 20 7000 11000
500 20 4000 8000
1000 20 2500 5000
2000 20 1500 3000
5000 20 1100 2200
10000 10 900 1800
1 Model P500C, P1000C, P2000C, P10KC, H3C and H4C
2 Model C2K, C4K and C10K

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Contact

Stephane Struyve
Stephane Struyve

Contact

Quantum Design GmbH

Meerstraat 177
B-1852 Grimbergen
Belgium

Phone+32 230 84324
Mobil:+32 495 797175
E-mail:benelux@qd-europe.com
Stephane StruyveSales Manager
+32 2 3084324
stephane.struyve@qd-europe.com