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Schematic of the BAL with an external cavity in a Littman–Metcalf configuration. The diode laser is AR coated to reflectance on the output facet. A cylindrical microlens collimates the fast axis, while an cylindrical lens collimates the slow axis.
A low resolution spectrum of the BAL. The intrinsic linewidth is shown without using an external cavity. The tunability of the narrowed diode laser in an external cavity is roughly 10 nm.
High resolution Fabry–Pérot spectra using sweep times of 10 ms. (a) 4.4 W output power. (b) 9.7 W output power.
An integrated high resolution Fabry–Pérot spectra with an output power of 0.5 W from the external cavity. The integration is performed over approximately 0.5 s, obtained by combining 50 scans of 10 ms.
The performance of the BAL with and without an external cavity.
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