Mohamad Halim Abd. Wahid
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Preferred name
Mohamad Halim Abd. Wahid
Official Name
Mohamad Halim, Abd. Wahid
Alternative Name
Wahid, M. H.A.
Wahid, Mohamad Halim Abdul
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Scopus Author ID
5478542340
Researcher ID
DTC-0242-2022

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  • Publication
    Gigahertz repetition rate ultrashort laser pulses from coherent external Fabry-Pérot cavity
    ( 2020-01-08)
    Chan, Tian Seng
    ;
    Mohamad Halim Abd. Wahid
    ;
    Prabakaran A/L Poopalan
    Transient analysis of ultrashort laser pulses (USP) output from a coherent external Fabry-Pérot cavity (CEFPC) comprising a group delay dispersion (GDD) balanced ultrafast Bragg reflector and a negative dispersion double-chirped mirror for sub-terahertz repetition rate generation is investigated. Analytical results manifest a low multiplication factor (MF) of the CEFPC with value equal to any non-integer, real number greater than unity (NIRNGU) could lead to the amplitude varying, transient timing-jitter, but at very high constant repetition rate (frep-o-Constant) USP output pulse train. For the configuration - (MF) TaeFP = TaUSP-in, where MF is a NZRNGU, the MF is not a factor which usually describes the relationship between the frep-o and frep-i, but rather a factor which determines the correlation of USPs TUSP-in and TeFP. Besides, this mentioned configuration is proven to be more easily to generate a CW, high frep-o USP train (>10GHz) at steady-state, compared to the conventional configuration with MF equal to a non-zero positive integer, which requires a much shorter external cavity length to generate a similar high frep-o USP train.
      3  31
  • Publication
    Coherent staking of ultrashort laser pulses in coherent external Fabry-Pérot cavity
    ( 2020-01-08)
    Tan Chan Sin
    ;
    Mohamad Halim Abd. Wahid
    ;
    Prabakaran A/L Poopalan
    The ultrashort laser pulses (USP) output from a coherent external Fabry-Pérot cavity (CEFPC) comprising a group delay dispersion (GDD) balanced ultrafast Bragg reflector and a negative-dispersion double-chirped mirror is investigated. As each of the input USP is coherently overlapped with each intracavity USP inside the CEFPC, an increasing USP output amplitude is gradually built up with time, until a steady-state condition is achieved. Analytical results manifest the multiplication factor (MF) or the ratio of output to input pulse repetition rate of the CEFPC equal to unity lead to the generation of continuous, timing-jitter-free, delayed amplitude at an identical repetition rate USP output. Besides, the output intensity pulse train settling time is directly proportional to the finesse of CEFPC.
      21  3