In contrast to DFB singlemode lasers, Fabry-Perot (FP) QCLs do not have an integrated optical grating focusing the power to only one wavelength. Therefore they emit multimode and broad range and can cover more than 20% of the central emitting wavelength.

Some DFB lasers exhibit similar emission behavior than FP QCLs as they have several modes (multimode) and also have a broad emission range. These are however not genuine Fabry Perot QCLs and in general the emission does only cover several tens of wavenumbers.

FP-QCLs can operate at room temperature on TEC. The emission is in the same wavelength range as for DFB QCLs. i.e. from 600cm-1 to 2350cm-1 with similar threshold current and voltage. The variation of temperature has a low influence on the emission bandwidth. This is mainly defined by the supplied current. FP-QCLs are well adapted when broad band emission is acceptable, for ex. in liquid spectroscopy, high power emiting sources, when no signal purity is required or for using the QCL with external cavities.

Parameters that define a FP-QCL:

• the central wavelength is defined by the centroid of total emitted power
• the bandwidth is defined as the wavelength range where 99% of the power is emitted.
• for the same laser, the central wavelength and the bandwidth can change in function of the operating current and voltage
• the variation of the QCL temperature has a low influence on the central wavelength and the bandwidth

A large inventory of FP lasers is available in our inventory so please submit us your specification so we can propose you the best QCL fitting your application. Please contact us.

Click on the links below to access to some examples of Fabry Perot lasers in stock.

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Sample Datasheet of Room-Temperature Pulsed Fabry Perot QCL around 2240-2280cm-1
Fabry Perot laser operating in pulsed mode on TE cooler.

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Sample Datasheet of Room-Temperature Wide tunable Fabry Perot QCL
Fabry Perot laser operating in pulsed or CW mode on TE cooler well adapted for using with external cavities.

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High Power Cryo- or Room-Temperature Pulsed Fabry Perot QCL
"Fingerburner" High Power Fabry Perot laser operating in pulsed mode on TE or cryogenic cooler.

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