| Ammonia (NH₃) combustion research has expanded significantly in recent years as viable alternative to fossil fuel. Due to its potential as a carbon-free fuel, a promising medium for energy storage, renewable energies, and sustainable fuel. However, its low reactivity, narrow flammability, low flame speed, high ignition energy requirements, and nitrogen oxide (NOₓ) emissions limit its use. The present study investigates dual-pulse laser (DPL) plasma-assisted ignition to overcome these limitations in pure ammonia and ammonia–hydrogen blends. A quasidirect numerical simulation (quasi-DNS) framework is employed to calculate the laminar flame speed (SL) for different equivalence ratios of ϕ = 0.7–1.25 and pressures of 0.1–0.5 MPa, while assessing the effects of hydrogen blending and initial preionization level. Laminar flame speed is calculated using radius evolution technique applied to the temporal growth of the flame front area, which accommodates the non-spherical kernel geometry inherent to laser-induced plasma ignition. The Damköhler (Da) and Karlovitz (Ka) numbers are calculated to characterize combustion regime transitions and quantify the interplay between chemical timescales and flow-induced stretch effects. To improve computational efficiency, a hybrid approach couples species concentrations and temperature fields from the DNS plasma solver directly into the Cantera detailed chemistry solver. Both approaches are validated against published experimental datasets, showing good agreement. Results demonstrate that DPL plasma ignition consistently enhances SL and suppresses NOₓ emissions compared to conventional spark ignition for both pure ammonia and hydrogen-enriched ammonia mixtures, underscoring the potential of laser plasma ignition as an effective combustion strategy for carbon-free fuel applications. Keywords: Laminar flame speed, DNS, Dual-pulse laser, Ammonia, Hydrogen |