Ultra-broadband, tunable mid-IR source based on enhanced-efficiency intrapulse difference-frequency generation
Abstract
We report on an ultra-broadband mid-infrared source based on intrapulse difference-frequency-generation delivering 135 nJ, 50 fs-long pulses at 250 kHz repetition-rate. A bichromatic waveplate is used, enhancing the number of photons for the mid-infrared generation.