Description:
The L40(250)A-BB-50 is a general purpose thermal power/energylaser measurement sensor with a 50mm aperture. It can measure from300mW to 35W continuously and to 250W intermittently. It canmeasure energy from 100mJ to 4000J. It has the spectrally flatbroadband coating and covers the spectral range from 0.19 to 20µm.The sensor comes with a standard 1.5 meter cable for connecting toa meter or PC interface.
Model | L40(250)A-BB-50 | L40(250)A-LP2-50 | L40(200)A-EX-50 | L40(500)A-LP2-DIF-35 |
Use | General purpose | CW and Long Pulse Lasers | Excimer lasers | Concentrated Beams |
Absorber Type | Broadband | LP2 | EX | LP2 + Diffuser |
Spectral Range µm | 0.19 - 20 | 0.25 - 2.2, 2.94 | 0.15 - 0.7, 10.6 | 0.44 - 2.2 (c) |
Absorption | ~88% | >94% from 0.25 to 1.1µm | ~95% | ~14% backscatter from diffuser |
Aperture mm | Ø50mm | Ø50mm | Ø50 mm | Ø35mm |
Power Mode | ||||
Power Range | 300mW - 250W (b) | 300mW - 250W (b) | 300mW - 200W | 300mW - 500W (b) |
Maximum Intermittent Power | 250W for 1.5min, 150W for 3min, 80W for 6min, 35W continuous(b) | 250W for 1.5min, 150W for 3min, 80W for 6min, 40W continuous (b) | 200W for 1.5min, 150W for 3min, 80W for 6min, 35W continuous | 500W for 45s, 250W for 1.5min, 150W for 3min, 80W for 6min, 40 continuous (b) |
Power Scales | 250W / 30W | 250W / 30W | 200W / 20W | 500W / 50W |
Power Noise Level | 15mW | 15mW | 15mW | 20mW |
Maximum Average Power Density kW/cm2 | 10 at 250W 20 at 35W | 20 at 250W 50 at 40W | 1.5 | >150 at 500W |
Response Time with Meter (0-95%) typ. s | 2.5 | 2.5 | 2.5 | 2.5 |
Power Accuracy +/-% | 3 | 3 (a) | 3 | 3 |
Linearity with Power +/-% | 1 | 1 | 1 | 1 |
Beam Size Dependence | <1% for beams up to 35mm diameter | |||
Max Beam Diameter for Gaussian beam | Ø35mm | Ø35mm for up to 30deg incidence | Ø35mm | Ø25mm for normal incidenceØ15mm for 20deg incidence (d)Ø10mm for 30deg incidence (d) |
Energy Mode | ||||
Energy Range | 100mJ - 4000J | 100mJ - 10,000J | 100mJ - 200J | 100mJ - 2000J |
Energy Scales | 4kJ / 400J / 40J / 4J | 10kJ / 1kJ / 100J / 10J | 200J / 30J / 3J | 2kJ / 200J / 20J / 2J |
Energy Accuracy | ±5% | ±5% 700 – 1100nm (a, b) | ±5% | ±5% 900 – 1100nm (b) |
Maximum Exposure Before Cooling Down is Necessary | NA | NA | ||
Minimum Energy mJ | 100 | 100 | 100 | 100 |
Maximum Energy Density J/cm2 | ||||
<100ns | 0.3 | 0.1 | 0.5 | 3 |
1µs | 0.4 | 0.9 | 0.6 | 3 |
0.5ms | 5 | 50 | 6 | 10 |
2ms | 10 | 130 | 12 | 20 |
10ms | 30 | 400 | 25 | 30 |
>300ms | See below (b, c) | See below (b, c) | NA | See below (b, e) |
Cooling | convection / ballistic | convection / ballistic | convection / ballistic | convection / ballistic |
Fiber Adapters Available | ST, FC, SMA, SC | ST, FC, SMA, SC | NA | NA |
Weight kg | 0.6 | 0.8 | 0.6 | 0.6 |
Compliance | CE, China RoHS | CE, China RoHS | CE, China RoHS | CE, China RoHS |
Part number | 7Z02793 | 7Z02794 | 7Z02795 | 7Z02797 |
Notes: (a) Above 1.1µm there is an additional calibrationuncertainty of up to 2% except at the additional calibration pointof 2.94µm where the additional uncertainty is 1%.
Notes: (b) Long pulses (0.5 – 4s) can be used to measure powerof high power lasers by measuring the energy of a short exposure.The StarBright, Juno, Juno+ and Centauri meters have a Pulsed Powermode where the user may specify the pulse width and get areading directly in units of power for this short exposure energymeasurement. See also page 75
Notes: (c) Calibrated for 900 – 1100nm
Notes: (d) At large angles of incidence, the position the beamhits the absorber should be offset into the direction of incidenceby 5-10mm for correct reading and at 20deg incidence the readingwill be 5% lower and at 30deg incidence 10% lower
Notes: (e) Recommended exposure times and 1/e2 Gaussianbeam diameters for very long pulses. Total energy for aseries of measurements should not exceed 20kJ (*8kJ).Cooling down time before another 20kJ (*8kJ) series, 10min. Recommended time between shots 12s.
* for L40(500)A-LP2-DIF-35