A pulse-dilation X-ray diodes (XRD) is developed and also tested using a femtosecond laser. A time-dependent ramp waveform is applied to a photocathode (PC) to introduce a time-dependent electric field between PC and mesh. This electric field leads to an axial speed dispersion of the photoelectron signal. The electrons generated earlier move faster than those later. The photoelectrons transiting a drift region are stretched before reaching a microchannel plate (MCP), and are then amplified and read out with a digital oscilloscope. The detector's time response is enhanced by 11 times with the usage of pulse-dilation technique.