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the power that raises the heat-sink temperature to 200°C (due to a temperature
limit dictated by circuitry inside the MH).
To date, we have determined that a 17
mm sensor in a 76. 2 × 76. 2 × 32. 3 mm
FR heat sink can measure up to 2 k W
of continuous-wave radiation at a 1 µm
wavelength. In the isolated configuration,
the maximum measurable power is the
power that raises the sensor temperature
to 800°C.
Damage threshold (DT) at a given
wavelength is a function of both the
average power in a laser beam cross-sec-
tion and the peak pulse power, where,
although the average power may be well
below the DT of a LPM sensor, the peak
pulse power may still damage the sensor.
In both cases, as the average power in
a laser beam increases, the DT of the
sensor decreases.
Experimental results
To date we have measured DT at three
wavelength (λ) values (see table). DT was
reached in two of the three tests, while
in the third test, the SiC sensor was not
damaged. In all three tests, the damage
threshold exceeded that of any other LPM
sensor by many orders of magnitude.
A unique capability of the FR MH is its
1 s waiting times between measurement
cycles. This is valuable when the MH is
built into a laser, and a movable mirror
is used to toggle the beam between the
laser process optics and the LPM sensor.
Very short cycle times, applicable to
laser manufacturing, are possible in the
FR mode, where, if the sensor is zeroed
before each measurement, the sensor
response to each succeeding laser beam
exposure is accurate, whether or not the
MH has returned to its initial temperature.
This can be repeated until the MH tem-
perature reaches 200°C. With the proper
heat-sink mass, this temperature may
never be reached. — Dr. James Parsons,
email: jim.parsons@firebirdsensors.com
Damage-threshold data to date for SiC bolometer sensors
λ (nm) Emitted power (W) Power density (W/cm2) Pulses Energy Damage threshold
test result
Average Peak Average Peak Width Frequency Joules Joules/cm2
532 92 92000 58000 58000000 100 ns 10 kHz 0.009 5. 8 Damage threshold
1037 10 10000000 1000000 1013
100 fs 1 MHz 10-7 0.01 No damage ( 35 min)
2935 3. 8 6675000 510 884895000 100 µs 3 Hz 1. 28 170 Damage threshold
