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Frequency stabilisation of single emitters and the effect on the beam quality

: Klein, S.; Hengesbach, S.; Traub, M.; Hoffmann, D.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Photonics Society, Scottish Chapter; European Photonics Industry Consortium -EPIC-:
IEEE High Power Diode Lasers and Systems Conference, HPD 2015. Proceedings : Co-located with Photonex 2015, 14th and 15th October 2015, Coventry, United Kingdom
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4673-9177-1 (Print)
ISBN: 978-1-4673-9178-8 (Electronic)
ISBN: 978-1-4673-9179-5 (Print on Demand)
High Power Diode Lasers and Systems Conference (HPD) <2015, Coventry>
Fraunhofer ILT ()

We present the improvement of the lateral beam quality due to frequency stabilisation in a Dense Wavelength Division Multiplexing setup using Volume Bragg Gratings. The spectral width of each frequency stabilised channel amounts to less than 300 pm and an overall multiplexing efficiency of 86% has been measured. The near and far field intensity distributions consist of discrete modes and were observed with a post positioned beam analysis module. When operated with frequency stabilisation, the lateral beam quality factor M2 of the single emitters decreased by a factor of 1.4 on average compared to the free running source.