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 range300mw - 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 range100mj - 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 mj100
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
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