A spectrometer (110) including a triggering element (124) for generating a series of trigger signals, a first laser (10) for emitting toward a sample (112) a first laser light pulse (118) having a first wavelength in response to receiving each of the trigger signals, the first laser (10) being wavelength tunable so that the first wavelength is selectively variable; a second laser (114) for emitting toward the sample a second laser light pulse (120) having a second wavelength in response to receiving each of the trigger signals from the series of trigger signals; a dithering element (128) for selectively retarding transmission of the trigger signals to at least one of the first and second lasers such that the first and second laser light pulses (118, 120) are received at the sample substantially non-simultaneously; a delaying element (126) for retarding transmission of the trigger signals to at least one of the first and second lasers in a manner such that the first and second laser light pulses (118, 120) are received at the sample substantially simultaneously when the dithering element (128) is inactive state.