| Abstract [eng] |
The main objective of this research is to construct three external cavity diode laser (ECDL) systems using 2025 nm, 2250 nm and 2380 nm superluminescent diode lasers (SLD) as a gain medium and measure main characteristics. ECDL can be widely used in various spectroscopic applications, gas and liquid sensing, telecommunications, light detection and ranging systems due to its wide tuning range and narrow linewidth. Littrow configuration was used to build ECDL system. Measured maximum output powers reached values up to 21.46 mW, 16.9 mW and 20.65 mW for 2025 nm, 2250 nm and 2380 nm ECDLs, respectively. 2250 nm and 2380 nm ECDLs exceeded maximum power of a standalone SLDs multiple times. This happens because Auger recombination dominates in a standalone SLD. ECDL demonstrated continuous wave (CW) regime and side-mode suppression ratio of more than 30 dB. Spectral measurements revealed tuning opportunities. Spectral tuning of ~ 0.44 nm, ~ 0.27 nm and ~ 0.48 nm was achieved in specific interval of injection current in 2025 nm, 2250 nm and 2380 nm, respectively. Fine wavelength tuning of ~ 0.44 nm, ~ 0.27 nm, ~ 0.48 nm using PZT was achieved for 2025 nm, 2250 nm and 2380 nm, respectively. Thermal tuning of ~ 0.35 nm/K and ~ 0.55 nm/K was achieved for 2025 nm and 2250 nm ECDLs, respectively. |
