Time-frequency applications need high accuracy and high stability clocks. Compact industrial optically pumped Cesium beam standards are promising to address various demands. In this context we are developing Al-free active region distributed-feedback diode (DFB) lasers at 852nm and 894nm for, respectively, the D2 and D1 line Cesium pumping. In order to address the long term reliability of these lasers, long duration ageing tests (more than one year targeted) are being carried out for both wavelengths at 20mW and 25°C. The laser diodes have been ageing for 4950 hours and 3120 hours respectively with very low increase of the operating current.
P. Resneau, N. von Bandel, M. Garcia, M. Lecomte, Y. Robert, E. Vinet, O. Drisse, O. Parillaud, and M. Krakowski, "Long time ageing tests of DFB ridge laser diodes emitting at 852nm and 894nm for cesium atomic clocks," Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 1011132 (Presented at SPIE OPTO: February 03, 2017; Published: 27 January 2017); https://doi.org/10.1117/12.2252608.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon