Wavelength tuning source based on a rotatable reflector

An apparatus for providing an electromagnetic radiation, comprising:

• a first arrangement including at least one section thereon which is configured to receive a first electromagnetic radiation, wherein the at least one section is configured to at least one of transmit or reflect a second electromagnetic radiation associated with the first electro-magnetic radiation, and wherein a wavelength of the second electromagnetic radiation is scanned in a characteristic repetition time;
• a second arrangement including at least one laser cavity which is configured to receive the second electromagnetic radiation, wherein a roundtrip travel time of the second electromagnetic radiation in the laser cavity is substantially equal to an integer multiple of the characteristic repetition time;
• and
• a third arrangement provided internally or externally with respect to the second arrangement, and configured to amplify at least one of the first electromagnetic radiation or the second electromagnetic radiation based on at least one Raman amplification characteristic.