Tunable amplitude squeezed light is experimentally generated at low temperature (80 K) in a laser diode with light injection locking from Ti:sapphire laser. The amplitude squeezing of the output light from the laser diode can be obtained at 1.1 dB (lower than shot noise limit) throughout a tunable range 13 GHz. The amplitude squeezed light generated by injection locking is compared with that by external grating feedback.