Abstract
In this paper, a widely tunable external cavity diode laser (ECDL) with an ultra-high side mode suppression ratio (SMSR) was fabricated. Three configurations were constructed to investigate the relationship between the grating features and the SMSR. When a 1200 grooves/mm grating with a first order diffraction efficiency of 91% is utilized in the external-cavity laser system, a maximum SMSR of 65 dB can be achieved. In addition, the tunable range reaches 209.9 nm. The results show that the laser performance can be improved by proper high grating groove number and first-order diffraction efficiency.
Highlights
Based on the characteristics of broad tunability, narrow linewidth and compactness, the tunable external cavity diode laser (ECDL) has a broad application in many fields, including atomic physics, laser radar, optical communication, optical measurement, and optical sensing [1,2,3,4,5,6]
ECDLs with a Littrow configuration based on quantum-well or quantum-dot (QD) laser sources are in widespread use and broadly investigated [11,12]
We demonstrate a Littrow external cavity laser with high side mode suppression ratio (SMSR)
Summary
Based on the characteristics of broad tunability, narrow linewidth and compactness, the tunable external cavity diode laser (ECDL) has a broad application in many fields, including atomic physics, laser radar, optical communication, optical measurement, and optical sensing [1,2,3,4,5,6]. There have been some reports on the widely tunable grating-coupled grating-coupled external-cavity laser at 1.5ofμm, of the ECDL low. We demonstrate a Littrow external cavity laser with high SMSR and atunable wide. We demonstrate a Littrow external cavity laser with a higha SMSR and a wide tunable range based on a commercial. To learn the influence of grating features, including diffraction efficiency and ruling density, on the SMSR and the tunable range, two gratings with different ruling densities were used in the external. The diffraction efficiency was about for the first order at the blazed wavelength the first order at the blazed wavelength of 1550 nm, which was almost the same as configuration A
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