Quantum cascade lasers (QCLs) by Daylight Solutions are semiconductor lasers which utilize epitaxially grown quantum wells that contain electrons in lasing states. The optical physics of a QCL differ from that of a diode laser. In a QCL the lasing transition occurs between states within a given quantum well. In contrast, in a diode laser transitions occur between the conduction band and valence band of the semiconductor material. One advantage of this construction is that the electron responsible for the emission of the photon tunnels into the next quantum well and as a result, multiple photons can be generated by a single electron, thereby making them extremely efficient. The tunneling from one well to the next is where the term “quantum cascade” comes from. Furthermore, the well depths can be engineered by controlling layer depths during the fabrication process and hence the wavelength of the lasing transition is dependent on the physical structure of the device. By carefully designing the quantum wells, lasing has been achieved at wavelengths as short as 2.75 µm and as long as 161 µm (1.9 THz).

We also deliver compact, high energy Nd:YAG lasers by Litron Lasers, innovative VBG lasers by PD-LD and wide range of accessories for lasers.