Applicable model*: AQ6380/AQ6370 series/AQ6360
High-power gas lasers and fiber lasers of several Watt class are used for material processing and marking. These high power lasers are used with pulsed light to reduce the effects of heat generation, and The higher the output, the narrower the pulse width and the lower the repetition frequency. (e.g. pulse width: tens of ns, repetition cycle: tens of Hz)
With the applicable models, there are three methods to measure pulsed light : peak hold mode, external trigger mode, and normal mode (time average spectrum measurement.
Normal mode (Time average spectrum measurement)
The average power of the pulsed light is measured as the power of the optical spectrum. When the pulsed light is a square wave, the average optical power measured is (peak power of optical pulse [mW]) × (duty ratio of pulsed light). The smaller the duty ratio of the pulsed light, the lower the measurement power, but you can measure even a narrow pulse width.
The higher average power has the advantage of being faster than other methods. However, in this mode, the repetition frequency needs to be high enough to measure the average power correctly.
If the repetition frequency is low, measurement may be possible by selecting a high sensitivity setting or increasing the number of averaging.
* All versions unless otherwise specified.
Peak hold mode
Capture the peak value within the light pulse repetition period. The measurable pulse width is 100 μs or more.
External trigger mode
Capture the peak value of the optical pulse by supplying the OSA with a trigger signal that is synchronized with the optical pulse. The measurable pulse width is 50 μs or more.
Applicable measurement modes per OSA model
Measurement modes |
AQ6360 |
AQ6380 AQ6370 AQ6373 AQ6374 |
AQ6375 AQ6376 AQ6377 |
Time average spectrum |
l |
l |
l |
External trigger |
|
l |
¡ |
Peak hold |
|
l |
¡ |
l: Available
¡: Available (conditional)
Blank:Not available
Note. The external trigger and peak hold measurements are not available in HIGH1, HIGH2, and HIGH3 of AQ6375, AQ6376, and AQ6377 where the high dynamic range "CHOP“ mode is used.
Note. AQ6380 can measure Pulsed Light in
“TRAD” mode only.
Direct capture of high power pulsed light
High Performance LONG WAVELENGTH
The AQ6375B is a bench-top optical spectrum analyzer covering the long wavelengths, 1200 to 2400 nm, with the added benefits of gas purging input ports / output ports, a built-in cut filter for high order diffracted light, and a novel double speed mode which increases the sweep speed up to 2 times compared to the standard sweep mode.
High Performance LONG WAVELENGTH
The AQ6375E covers not only telecommunication wavelengths, but also the SWIR region which is often used for environmental sensing and medical applications.
・Lineup of 3 models [Standard, Extended and Limited]
・Covers wavelengths
1200 to 2400 nm [Standard, and Limited]
1000 to 2500 nm [Extended ]
MWIR WAVELENGTH with internal gas purge and cut filter
The AQ6376 is the latest version of our bench-top optical spectrum analyzer extending the wavelength coverage well beyond the NIR range of our previous models into the MWIR region from 1500 to 3400 nm.
Popular applications include the detection of gases such as carbon oxides (COx), nitrogen oxides (NOx), and hydrocarbon gas (CxHy) for environmental studies.
MWIR WAVELENGTH with internal gas purge and cut filter
The AQ6376E is the latest version of our bench-top optical spectrum analyzer extending the wavelength coverage well beyond the NIR range of our previous models into the MWIR region from 1500 to 3400 nm.
Popular applications include the detection of gases such as carbon oxides (COx), nitrogen oxides (NOx), and hydrocarbon gas (CxHy) for environmental studies.
AQ6380 OSA: 5 pm (0.624 GHz) high wavelength resolution, ±5 pm accuracy, 65 dB wide close-in dynamic range, 80 dB high stray light suppression