Tunable External-Cavity Semiconductor Lasers

Diode lasers: From laboratory to industry

“…Despite compactness and ease in use, solitary diode lasers have some intrinsic limitations like multimode nature and large linewidths owing to the short cavity lifetime along with strong coupling between amplitude and phase of the intracavity optical field that turned out potentially serious in certain applications [6]. Spatial uniformity and wavelength stability of laser beam become fluctuating under volatile ambient conditions in case of solitary diode lasers.…”

“…Gabbanini [23] demonstrated the laser cooling of barium atoms using a DFB laser at 1.500 mm. The required UV light for laser cooling and magneto optically trapping of 6 Li atoms as shown in Fig. 5, was obtained by passing the laser of a frequency-doubled laser system comprised of a grating stabilized diode laser working at 646 nm through dichroic mirrors [24].…”

A Review of Exhaust Gas Temperature Sensing Techniques for Modern Turbine Engine Controls

“…Diode lasers are tuned in two ways: 1) adjusting their temperature, and 2) changing injection current density into the gain medium. 37 As the laser sweeps over the range of wavelengths, the photodetector will see a drop in the intensity of emission at those wavelengths corresponding to the absorption lines. One common method of measuring temperature requires taking a ratio of integrated absorbances for two separate source wavelengths.…”

Appendix A

“…Reviews on tunable external cavity tunable semiconductor lasers are given by Zorabedian (1995) and Duarte (2009), among others (Tables A.19 through A.24). Semiconductor lasers work via direct electrical excitation, are compact, are inherently tunable, and can be very stable.…”