Interference between stretched and original pulses

An off-axis holographic recording method for fast-moving objects that has a time resolution of several picoseconds and a large depth of field is suggested. Two different but mutually coherent laser pulses, the original pulse (20 ps) and a stretched pulse (60 ps), are interfered. The short pulse determines the resolution, and the stretched pulse increases the field depth. Interference patterns between the short and the expanded pulses, for [Lambda] = 1.064 [micro] m and [Lambda] = 0.532 [micro] m, are demonstrated. [C] 2000 Optical Society of America OCIS codes: 320.7100, 120.3180, 090.0090, 110.6880.