A tunable lasing device comprising: a vertical external cavity surface emitting laser having a semiconductor disk and adapted to generate a fundamental laser beam in response to pumping from a pump source, said fundamental laser beam having a fundamental wavelength and a fundamental linewidth; said lasing device comprising: a fundamental resonator cavity defined at least by a mirror and a Distributed Bragg Reflector being integral to the vertical external cavity surface emitting laser and adapted to resonate the fundamental beam therein; a first optical element located within the fundamental resonator cavity, the first optical element comprising one or more birefringent filters and/or one or more etalons adapted for narrowing of the fundamental linewidth of the fundamental beam; a Raman resonator cavity located at least partially in said fundamental resonator cavity and coupled therewith, the Raman resonator adapted to receive the fundamental beam and comprising therein: a solid state Raman active medium located in said fundamental resonator cavity for generating at least a first Stokes beam from the fundamental beam wherein said Raman resonator cavity is adapted to resonate said Stokes beam therein and further adapted to emit an output beam; and a nonlinear medium located in said fundamental resonator cavity for nonlinear frequency conversion of at least one of the beams present in said Raman resonator cavity thereby generating a frequency converted beam; wherein said mirror operates as an output coupler adapted to emit said output beam, said mirror being highly reflective at the fundamental and Stokes wavelength, said output beam comprising at least a portion of said frequency converted beam derived from at least one of the resonating beams in said fundamental or said Raman resonator cavities; and wherein said output beam is continuously tunable within two discrete wavelength ranges, with the wavelength range being from about 470 to 520nm and 520 to 560 nm; wherein the continuous tuning results from either second harmonic generation of the fundamental beam or the Stokes beam or sum-frequency generation of both fundamental and Stokes beams and wherein each of the frequency conversion processes spectrally overlap thereby providing a continuous tuning in the discrete ranges. a fundamental resonator cavity defined at least by a mirror and a Distributed Bragg Reflector being integral to the vertical external cavity surface emitting laser and adapted to resonate the fundamental beam therein; a first optical element located within the fundamental resonator cavity, the first optical element comprising one or more birefringent filters and/or one or more etalons adapted for narrowing of the fundamental linewidth of the fundamental beam; a Raman resonator cavity located at least partially in said fundamental resonator cavity and coupled therewith, the Raman resonator adapted to receive the fundamental beam and comprising therein: a solid state Raman active medium located in said fundamental resonator cavity for generating at least a first Stokes beam from the fundamental beam wherein said Raman resonator cavity is adapted to resonate said Stokes beam therein and further adapted to emit an output beam; and a nonlinear medium located in said fundamental resonator cavity for nonlinear frequency conversion of at least one of the beams present in said Raman resonator cavity thereby generating a frequency converted beam; wherein said mirror operates as an output coupler adapted to emit said output beam, said mirror being highly reflective at the fundamental and Stokes wavelength, said output beam comprising at least a portion of said frequency converted beam derived from at least one of the resonating beams in said fundamental or said Raman resonator cavities; and wherein said output beam is continuously tunable within two discrete wavelength ranges, with the wavelength range being from about 470 to 520nm and 520 to 560 nm; wherein the continuous tuning results from either second harmonic generation of the fundamental beam or the Stokes beam or sum-frequency generation of both fundamental and Stokes beams and wherein each of the frequency conversion processes spectrally overlap thereby providing a continuous tuning in the discrete ranges. a solid state Raman active medium located in said fundamental resonator cavity for generating at least a first Stokes beam from the fundamental beam wherein said Raman resonator cavity is adapted to resonate said Stokes beam therein and further adapted to emit an output beam; and a nonlinear medium located in said fundamental resonator cavity for nonlinear frequency conversion of at least one of the beams present in said Raman resonator cavity thereby generating a frequency converted beam; wherein said mirror operates as an output coupler adapted to emit said output beam, said mirror being highly reflective at the fundamental and Stokes wavelength, said output beam comprising at least a portion of said frequency converted beam derived from at least one of the resonating beams in said fundamental or said Raman resonator cavities; and wherein said output beam is continuously tunable within two discrete wavelength ranges, with the wavelength range being from about 470 to 520nm and 520 to 560 nm; wherein the continuous tuning results from either second harmonic generation of the fundamental beam or the Stokes beam or sum-frequency generation of both fundamental and Stokes beams and wherein each of the frequency conversion processes spectrally overlap thereby providing a continuous tuning in the discrete ranges.