Laser diode arrangement for generating single-mode tunable laser radiation, having: ▪ a laser diode and ▪ an external resonator coupled thereto, said external resonator having a resonator mirror and at least one wavelength-selective optical reflection element having a diffractive surface, ▪ wherein the resonator mirror is mounted so as to be able to rotate about a swivel axis and is able to be turned selectively about the swivel axis by way of a deflection device, wherein a) the external resonator is designed such that a laser beam emitted by the laser diode into the external resonator impinges on a mirror surface of the resonator mirror at a first angle of incidence (γ) dependent on the rotation of the resonator mirror and is reflected thereby onto the at least one wavelength-selective optical reflection element at a second angle of incidence (φ) dependent on the first angle of incidence (γ), b) wherein an optical path (d) between the resonator mirror and the diffractive surface is influenced by the first angle of incidence (γ), and c) wherein the wavelength-selective optical reflection element reflects the laser beam in diffracted form back onto the resonator mirror such that it is guided from the resonator mirror back into the laser diode, d) wherein the wavelength of the laser beam reflected by the wavelength-selective reflection element is influenced by the second angle of incidence (φ), e) wherein the swivel axis is positioned on a side of the resonator mirror that faces away from the laser diode at a distance from the mirror surface, characterized in that f) a distance (a -2, a 0, a +2) between a line, closest to the swivel axis of the resonator mirror, on the mirror surface and a point of incidence of the overall laser beam on the mirror surface is always greater than 0. ▪ a laser diode and ▪ an external resonator coupled thereto, said external resonator having a resonator mirror and at least one wavelength-selective optical reflection element having a diffractive surface, ▪ wherein the resonator mirror is mounted so as to be able to rotate about a swivel axis and is able to be turned selectively about the swivel axis by way of a deflection device, a) the external resonator is designed such that a laser beam emitted by the laser diode into the external resonator impinges on a mirror surface of the resonator mirror at a first angle of incidence (γ) dependent on the rotation of the resonator mirror and is reflected thereby onto the at least one wavelength-selective optical reflection element at a second angle of incidence (φ) dependent on the first angle of incidence (γ), b) wherein an optical path (d) between the resonator mirror and the diffractive surface is influenced by the first angle of incidence (γ), and c) wherein the wavelength-selective optical reflection element reflects the laser beam in diffracted form back onto the resonator mirror such that it is guided from the resonator mirror back into the laser diode, d) wherein the wavelength of the laser beam reflected by the wavelength-selective reflection element is influenced by the second angle of incidence (φ), e) wherein the swivel axis is positioned on a side of the resonator mirror that faces away from the laser diode at a distance from the mirror surface, characterized in that f) a distance (a -2, a 0, a +2) between a line, closest to the swivel axis of the resonator mirror, on the mirror surface and a point of incidence of the overall laser beam on the mirror surface is always greater than 0.