A light detection device comprising: a laser light source for generating a light source pulse beam (Ps); a splitting unit (13, 16) for splitting the light source pulse beam (Ps) into a first pulse beam, a second pulse beam, and a third pulse beam (Pe); a first modulation unit for modulating an amplitude of the first pulse beam and for switching between executing and stopping amplitude modulation; a second modulation unit for modulating a phase of the second pulse beam and for switching between executing and stopping phase modulation; a first detection unit arranged for detecting light; and a control unit arranged for switching between and for executing: a first light detection mode in which a first image (Ga) is acquired by detecting, with the first detection unit, a stimulated Raman scattering signal generated by applying, to a sample, a first combined beam in which the first pulse beam on which amplitude modulation has been executed and the second pulse beam on which phase modulation has been stopped are combined, and a second light detection mode in which a second image (Gp) is acquired by detecting, with the first detection unit, a stimulated Raman scattering signal generated by applying, to the sample, a second combined beam in which the first pulse beam on which amplitude modulation has been stopped, the second pulse beam on which phase modulation has been executed, and the third pulse beam (Pe) are combined, characterized in that the light detection device further comprises a second detection unit; and in that the control unit is arranged for switching between and for executing the first and second light detection mode and a third light detection mode in which a third image (Gc) is acquired by detecting, with the second detection unit, confocal reflected light generated by applying, to the sample, the first pulse beam on which amplitude modulation has been executed, wherein the control unit is configured for synthesizing the first, second and third images (Ga, Gp, Gc) that have been acquired to generate a composite image (Gt). a laser light source for generating a light source pulse beam (Ps); a splitting unit (13, 16) for splitting the light source pulse beam (Ps) into a first pulse beam, a second pulse beam, and a third pulse beam (Pe); a first modulation unit for modulating an amplitude of the first pulse beam and for switching between executing and stopping amplitude modulation; a second modulation unit for modulating a phase of the second pulse beam and for switching between executing and stopping phase modulation; a first detection unit arranged for detecting light; and a control unit arranged for switching between and for executing: a first light detection mode in which a first image (Ga) is acquired by detecting, with the first detection unit, a stimulated Raman scattering signal generated by applying, to a sample, a first combined beam in which the first pulse beam on which amplitude modulation has been executed and the second pulse beam on which phase modulation has been stopped are combined, and a second light detection mode in which a second image (Gp) is acquired by detecting, with the first detection unit, a stimulated Raman scattering signal generated by applying, to the sample, a second combined beam in which the first pulse beam on which amplitude modulation has been stopped, the second pulse beam on which phase modulation has been executed, and the third pulse beam (Pe) are combined, characterized in that the light detection device further comprises a second detection unit; and a first light detection mode in which a first image (Ga) is acquired by detecting, with the first detection unit, a stimulated Raman scattering signal generated by applying, to a sample, a first combined beam in which the first pulse beam on which amplitude modulation has been executed and the second pulse beam on which phase modulation has been stopped are combined, and a second light detection mode in which a second image (Gp) is acquired by detecting, with the first detection unit, a stimulated Raman scattering signal generated by applying, to the sample, a second combined beam in which the first pulse beam on which amplitude modulation has been stopped, the second pulse beam on which phase modulation has been executed, and the third pulse beam (Pe) are combined, characterized in that the light detection device further comprises a second detection unit; and in that the control unit is arranged for switching between and for executing the first and second light detection mode and a third light detection mode in which a third image (Gc) is acquired by detecting, with the second detection unit, confocal reflected light generated by applying, to the sample, the first pulse beam on which amplitude modulation has been executed, wherein the control unit is configured for synthesizing the first, second and third images (Ga, Gp, Gc) that have been acquired to generate a composite image (Gt).