Design of dispersive oscillators for tunable lasers: these can be of the multiple-prism grating class or the standard grazing-incidence type. All designs aimed to yield single-transverse-mode emission. Required input parameters include cavity length, desired laser linewidth, desired efficiency, center wavelength, and wavelength tuning range. Option 1: design only. Option 2: design plus US made optical components. Note: these oscillator designs apply to either liquid or solid-state gain media.