Cross-correlation scan between an OPA pulse and a chirped stretched 800 nm pulse

We overlap the uncompressed 800 nm pulse (800 nm, ~140 ps) and the OPA (1800 nm, 50 fs) on a BBO crystal. The output light bounces off a grating, separating light at different wavelengths. The overlap signal from the sum-frequency generation is in the ~500 nm range. Since the uncompressed 800 nm pulse is severely chirped, when we scan the OPA delay through 800 nm pulse, the overlap signal changes color and position with time. This is a very interesting phenomenon to observe!

Why Do Autumn Leaves Change Their Color?

Retrieved October 11th, 2020 from https://smokymountains.com/fall-foliage-map/

Why Do Autumn Leaves Change Their Color?

Some consider it to be the most incredible time of the year. Gorgeous colors vibrantly encoring the end of summer as the trees put themselves to bed for the long sleep of winter. The Great Smoky Mountains floods with thousands upon thousands of annual visitors all hoping to achieve a breathtaking view of the beautiful renaissance of nature.