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 10% 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 740cm-1 to 2390cm-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 selection of FP lasers either pulsed or CW is available in our inventory so please submit us your specification if you dont find anything suitable in the examples below. This way we can propose you the best QCL fitting your application. Please contact us.

CW Fabry Perot lasers in stock

Type	Min lasing			Max lasing
RT-CW-FP-x-1000	985			1015
RT-CW-FP-x-1120	1095			1145
RT-CW-FP-x-1180	1150			1210
RT-CW-FP-x-1222	1200			1245
RT-CW-FP-x-1280	1250			1310
RT-CW-FP-x-1608	1580			1635
RT-CW-FP-x-1925	1880			1970
RT-CW-FP-x-2075	2040			2110
RT-CW-FP-x-2165	2095			2235

Note: All units in cm-1


The graph below shows some high performances FP QCLs operating in CW at and higher than room-temperature. The histograms indicate the maximum CW operating temperature for a given laser range (left y-axis). The lines indicate the typical CW power at 20°C for the same laser ranges (right y-axis).
TOP
>