Femtochrome Research Inc. has introduced a compact nonlinear crystal auto/cross correlator for use with weak laser pulse signals. The FR-103HS operates over a wavelength range from 410 to 1800 nm and at any pulse repetition rate >5 Hz. It has a scan range of >150 ps, suitable for pulse widths from 10 fs to 75 ps. Sensitivity is 0.5 × 10–8 W2, and resolution is ∼1 fs. A computer data acquisition option is available for display and analysis of traces via a PC. The design offers background-free autocorrelation and interferometric autocorrelation as an option.