Some spectroscopic techniques based on near infrared djode lasers are discussed with special emphasis on molecular spectroscopy. The semiconductor lasers provide for not only cheap coherent light sources of high quality, but also for new possibilities in experimental physics.

Articles you may be interested in Picosecond laser dynamics of gaincoupled and indexcoupled InGaAs/InGaAlAs quantum well distributed feedback lasers Appl. Ultralow chirping short optical pulse (16 ps) generation in gaincoupled distributed feedback semiconductor lasers Appl.

We report the first experimental realization of four-channel DFB laser array with equivalent phase shift (EPS) based on the reconstruction-equivalent-chirp (REC) technique for CWDM systems. OCIS codes: (140.0140) Lasers and laser optics; (140.5960) Semiconductor lasers

Beating noise in narrow-linewidth erbium-doped fiber ring lasers puts severe limitations on applications of the lasers. We demonstrate the suppression of beating noise in fiber ring lasers by using a semiconductor optical amplifier in the laser cavity, which acts as a high-pass filter. Two different ring structures are presented as examples to demonstrate this beating noise suppression.

Experimental investigations of synchronization and anti-synchronization of optically coupled semiconductor lasers with external cavities are presented. Both lasers show chaotic lowfrequency intensity fluctuations that are (anti-) synchronized due to optical coupling by light injection. For uni-directional coupling response lasers with and without external cavity are considered. In the case of b...

We have experimentally demonstrated current-injection optical phase-lock loops (OPLLs) based on commercial single-section semiconductor distributed-feedback (DFB) lasers. Using two parallel OPLLs, we have obtained 87% efficient coherent power combining of the two DFB lasers. The rms differential phase error between the two lasers is about 30 degrees .

In semiconductor lasers, current injection not only provides the optical gain, but also induces variation of the refractive index, as governed by the Kramers-Krönig relation. The linear coupling between the changes of the effective refractive index and the modal gain is described by the linewidth broadening factor, which is responsible for many static and dynamic features of semiconductor laser...

Vertical cavity surface emitting lasers (VCSELs) are stacks of tens of different semiconductor layers that constitute the basic components of the lasers: mirrors, optical cavity, and active material. Contrary to edgeemitting lasers, which use the cleaved faces of the semiconductor device as mirrors to confine the photon field laterally, VCSELs provide a laser emission along the stacking axis of...

Semiconductor lasers provide an excellent opportunity for communication using chaotic waveforms. We discuss the characteristics and the synchronization of two semiconductor lasers with optoelectronic feedback. The systems exhibit broadband chaotic intensity oscillations whose dynamical dimension generally increases with the time delay in the feedback loop. We explore the robustness of this sync...