A method for scanning a transmitted beam through a 360° field-of-view, FOV, and processing beams reflected off of a target in a light detection and ranging, LIDAR, system to determine a distance between the LIDAR system and the target and a velocity of the target, said LIDAR system including a transmitter sub-system and a receiver sub-system, said method comprising: generating a laser beam to be transmitted by the transmitter sub-system at a first frequency (v 1); determining a temperature of optical and electro-optical components in the transmitter and/or receiver sub-systems; adjusting the first frequency (v 1) of the laser beam to compensate for changes in the temperature of the optical and electro-optical components in the transmitter and/or receiver sub-systems; directing the laser beam to a spiral phase plate resonator, SPPR, device in the transmitter sub-system having opposing reflective surfaces that reflect the laser beam back and forth in the SPPR device, wherein one of the reflective surfaces includes a spiral step index that causes multiple internal reflected beams having different phases to be combined as the transmitted beam emitted from one side of the SPPR device and having a coherent superposition of optical vortex intensity patterns and a processing beam emitted from an opposite side of the SPPR device and having a coherent superposition of optical vortex intensity patterns; directing the transmitted beam from the SPPR device onto a conical mirror to direct the transmitted beam at a certain angle therefrom depending on the first frequency (v 1) of the laser beam; shifting the optical frequency of the laser beam to a second frequency (v 2) to change the angle that the transmitted beam is directed from the conical mirror; frequency modulating the laser beam at the second frequency (v 2) over a frequency modulation range; receiving a reflected beam from the target at the receiver sub-system; mixing and correlating the processing beam and the reflected beam; calculating a fast Fourier transform of signals representing the mixed processing and reflected beams (86, 108); determining beat frequencies in the mixed and transformed signals; identifying intermediate frequencies in the beat frequencies; estimating a time delay between the transmitted beam and the reflected beam from the beat frequencies to determine the distance to the target; determining a Doppler shift frequency from the beat frequencies to determine the velocity of the target; shifting the optical frequency of the laser beam to a plurality of other frequencies to change the angle that the transmitted beam is directed from the conical mirror over a complete 360° scan; and repeating the steps of frequency modulating, receiving a reflected beam from the target, mixing and correlating, calculating a fast Fourier transform, determining beat frequencies, identifying intermediate frequencies, estimating a time delay and determining a Doppler shift frequency for each separate optical frequency. generating a laser beam to be transmitted by the transmitter sub-system at a first frequency (v 1); determining a temperature of optical and electro-optical components in the transmitter and/or receiver sub-systems; adjusting the first frequency (v 1) of the laser beam to compensate for changes in the temperature of the optical and electro-optical components in the transmitter and/or receiver sub-systems; directing the laser beam to a spiral phase plate resonator, SPPR, device in the transmitter sub-system having opposing reflective surfaces that reflect the laser beam back and forth in the SPPR device, wherein one of the reflective surfaces includes a spiral step index that causes multiple internal reflected beams having different phases to be combined as the transmitted beam emitted from one side of the SPPR device and having a coherent superposition of optical vortex intensity patterns and a processing beam emitted from an opposite side of the SPPR device and having a coherent superposition of optical vortex intensity patterns; directing the transmitted beam from the SPPR device onto a conical mirror to direct the transmitted beam at a certain angle therefrom depending on the first frequency (v 1) of the laser beam; shifting the optical frequency of the laser beam to a second frequency (v 2) to change the angle that the transmitted beam is directed from the conical mirror; frequency modulating the laser beam at the second frequency (v 2) over a frequency modulation range; receiving a reflected beam from the target at the receiver sub-system; mixing and correlating the processing beam and the reflected beam; calculating a fast Fourier transform of signals representing the mixed processing and reflected beams (86, 108); determining beat frequencies in the mixed and transformed signals; identifying intermediate frequencies in the beat frequencies; estimating a time delay between the transmitted beam and the reflected beam from the beat frequencies to determine the distance to the target; determining a Doppler shift frequency from the beat frequencies to determine the velocity of the target; shifting the optical frequency of the laser beam to a plurality of other frequencies to change the angle that the transmitted beam is directed from the conical mirror over a complete 360° scan; and repeating the steps of frequency modulating, receiving a reflected beam from the target, mixing and correlating, calculating a fast Fourier transform, determining beat frequencies, identifying intermediate frequencies, estimating a time delay and determining a Doppler shift frequency for each separate optical frequency.