800 nm chirp pulse

I am working with a 800 nm (375 THz) pulse having a pulse duration of 10ps. I intend to introduce chirp in the pulse.

However I am not certain if the pulse has been chirped, because the pulse cycles are too may. So I ask if it is possible to reduce the no of cycles without altering the pulse frequency and duration. In this way I could acertain the presence of chirp in my pulse. Also, I appreciate any other hint on how to achieve my desired result.

Here is my MATLAB code;

N=1024*2^11;

dt=5e-16;

t=(-N/2:N/2-1)*dt;

%chirped pulse

f=375e12; %freq.

T=10e-12;%pulse duration in ps

alpha=0.18*(1e-12)^2; %chirp parameter in freq. representation

wave=exp(1i*2*pi*f.*(t)); %carrier wave

envelope=exp((-(t).^2)./(T^2)); %Gaussian envelope

chirp_factor=exp((1i*alpha).*(t.^2)); % Up Chirp

chirped_pulse=wave.*envelope.*chirp_factor; %Chirped beam

plot(t,real(chirped_pulse));xlim([-3 3]*1e-11)

Thank you for your aid.