DEVICE AND METHOD FOR ILLUMINATING A SAMPLE

摘要

A device (10) for illuminating a sample (40) is described, having: at least one pulsed laser light source (12) for repeated emission of a first laser pulse along a first light path (14) and of a second laser pulse along a second light path (16) physically separated from the first light path; a superimposition element (32) for collinear superimposition of the two laser pulses in a shared light path (34); a delay stage (26) arranged in the first or the second light path (14, 16), for delaying one of the two laser pulses relative to the other laser pulse in such a way that the two laser pulses sent along the shared light path (34) onto the sample (40) exhibit a temporal superimposition; a shared chirp unit (36) arranged in the shared light path (34), for frequency-modifying influencing both of the first laser pulse and of the second laser pulse; and at least one separate chirp unit (18) arranged in the first light path (14), for frequency-modifying influencing only of the first laser pulse. The shared chirp unit (36) and the separate chirp unit (18) are coordinated with one another in order to achieve a target state. The separate chirp unit (18) is coupled to a control system (20) by which the separate chirp unit (18) is controllable with a control parameter dependent on the wavelength of the first laser pulse in order to establish the target state.

主权项

1. A device for illuminating a sample, having
at least one pulsed laser light source for repeated emission of a first laser pulse along a first light path and of a second laser pulse along a second light path physically separated from the first light path; a superimposition element for collinear superimposition of the two laser pulses in a shared light path; a delay stage, arranged in the first or the second light path, for delaying one of the two laser pulses relative to the other laser pulse in such a way that the two laser pulses sent along the shared light path onto the sample exhibit a temporal superimposition; a shared chirp unit, arranged in the shared light path, for frequency-modifying influencing both of the first laser pulse and of the second laser pulse; and at least one separate chirp unit, arranged in the first light path, for frequency-modifying influencing only of the first laser pulse, the shared chirp unit and the separate chirp unit being coordinated with one another in order to achieve a target state in which an instantaneous frequency of the first laser pulse influenced both by the separate chirp unit and by the shared chirp unit, and an instantaneous frequency of the second laser pulse influenced only by the shared chirp unit, have a predetermined relationship to one another, wherein at least the wavelength of the first light pulse is variable in a predetermined wavelength range by means of the pulsed laser light source; and the separate chirp unit is coupled to a control system by which the separate chirp unit is controllable with a control parameter dependent on the wavelength of the first laser pulse in order to establish the target state.