A lidar device comprising: a light source unit; and a phase modulation active device configured to steer light from the light source unit toward an object; the phase modulation active device comprises: a phase modulator comprising a plurality of channels (CH_1 - CH_N), each channel of the plurality of channels configured to modulate a phase of incident light independently from other channels of the plurality of channels; a signal input unit configured to apply a first input signal for phase modulation to the each channel of the plurality of channels; and a controller characterized in that the controller is configured to: obtain a correlation between a phase modulation value of one of the plurality of channels and a voltage applied to the phase modulation active device; based on the correlation, set a value at which a phase change is saturated as a phase limit value of the phase modulation active device; generate a modified phase profile based on a phase profile by modifying a phase modulation target value, for at least one channel from the plurality of channels that meets or exceeds the phase limit value to a modified phase modulation target value that is less than the phase limit value in the phase profile; and control the signal input unit to apply the first input signal based on the modified phase profile. a light source unit; and a phase modulation active device configured to steer light from the light source unit toward an object; the phase modulation active device comprises: a phase modulator comprising a plurality of channels (CH_1 - CH_N), each channel of the plurality of channels configured to modulate a phase of incident light independently from other channels of the plurality of channels; a signal input unit configured to apply a first input signal for phase modulation to the each channel of the plurality of channels; and a controller characterized in that the controller is configured to: obtain a correlation between a phase modulation value of one of the plurality of channels and a voltage applied to the phase modulation active device; based on the correlation, set a value at which a phase change is saturated as a phase limit value of the phase modulation active device; generate a modified phase profile based on a phase profile by modifying a phase modulation target value, for at least one channel from the plurality of channels that meets or exceeds the phase limit value to a modified phase modulation target value that is less than the phase limit value in the phase profile; and control the signal input unit to apply the first input signal based on the modified phase profile. a phase modulator comprising a plurality of channels (CH_1 - CH_N), each channel of the plurality of channels configured to modulate a phase of incident light independently from other channels of the plurality of channels; a signal input unit configured to apply a first input signal for phase modulation to the each channel of the plurality of channels; and a controller characterized in that the controller is configured to: obtain a correlation between a phase modulation value of one of the plurality of channels and a voltage applied to the phase modulation active device; based on the correlation, set a value at which a phase change is saturated as a phase limit value of the phase modulation active device; generate a modified phase profile based on a phase profile by modifying a phase modulation target value, for at least one channel from the plurality of channels that meets or exceeds the phase limit value to a modified phase modulation target value that is less than the phase limit value in the phase profile; and control the signal input unit to apply the first input signal based on the modified phase profile. obtain a correlation between a phase modulation value of one of the plurality of channels and a voltage applied to the phase modulation active device; based on the correlation, set a value at which a phase change is saturated as a phase limit value of the phase modulation active device; generate a modified phase profile based on a phase profile by modifying a phase modulation target value, for at least one channel from the plurality of channels that meets or exceeds the phase limit value to a modified phase modulation target value that is less than the phase limit value in the phase profile; and control the signal input unit to apply the first input signal based on the modified phase profile.