Mohsin Haji

Mohsin Haji is a principal research scientist in the Time and Frequency department. He obtained a BEng honours degree from City University London in 2007 and a PhD from the University of Glasgow in 2012. He then worked as a production and test engineer at a semiconductor laser diode manufacturing company before joining NPL in 2014.  He has authored and co-authored over 60 peer-reviewed publications and reviews articles for several IEEE and OSA journal publications.

Mohsin leads NPL’s activities on developing compact atomic clocks and his team are currently working on the production of state-of-the-art miniature atomic clock systems along with several industrial partners in the UK. He has extensive experience in establishing new supply chains of critical components for quantum technologies and systems.  His fields of interest include compact atomic clock systems, semiconductor laser diodes and servo systems (e.g. for gas/molecular detection), optoelectronic oscillators, RF systems design, and transceiver systems for telecoms/datacoms.

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Key publications:

• High frequency optoelectronic oscillators based on the optical feedback of semiconductor mode-locked laser diodes
  M. Haji, L. Hou, A. E. Kelly, J. Akbar, J. H. Marsh, J. M. Arnold, and C. N. Ironside
  Optics Express, 20 (3), 3268-3274, (2012)
• GaN laser technology for cold-atom quantum sensors and optical atomic clocks
  S.P. Najda, P. Perlin, T. Suski, S. Stanczyk, M. Leszczyński, S. Schiavon, T. Slight, S. Gwyn, S. Watson, A.E. Kelly, J. Macarthur, L. McKnight, M. Knapp, M. Haji
  Optical Sensors, SW4I. 4, (2021)
• Dynamic Device Characteristics and Linewidth Measurement of InGaN/GaN Laser Diodes
  S. Gwyn, S. Watson, T. Slight, M. Knapp, S. Viola, P. Ivanov, W. Zhang, A. Yadav, E. Rafailov, M. Haji, K. E. Doherty, S. Stanczyk, S. Grzanka, P. Perlin, S. P. Najda, M. Leszczyski, A. E. Kelly
  IEEE Photonics Journal 13 (1), 1-10, (2020)
• Laterally coupled dual-grating distributed feedback lasers for generating mode-beat terahertz signals
  L. Hou, M. Haji, I. Eddie, H. Zhu, J.H. Marsh
  Optics letters 40 (2), 182-185, (2015)
• Generation of high-speed polarization modulated data using a monolithically integrated device
  M.A. Naeem, M. Haji, B.M. Holmes, D.C. Hutchings, J.H. Marsh, A.E. Kelly
  IEEE Journal of Selected Topics in Quantum Electronics 21 (4), 207-211, (2014)

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