Generation of sub-mJ terahertz pulses by optical rectification |
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Authors: | Fülöp J A Pálfalvi L Klingebiel S Almási G Krausz F Karsch S Hebling J |
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Institution: | Department of Experimental Physics, University of Pécs, Pécs, Hungary. fulop@fizika.ttk.pte.hu |
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Abstract: | Recent theoretical calculations predicted an order-of-magnitude increase in the efficiency of terahertz pulse generation by optical rectification in lithium niobate when 500 fs long pump pulses are used, rather than the commonly used ~100 fs pulses. Even by using longer than optimal pump pulses of 1.3 ps duration, 2.5× higher THz pulse energy (125 μJ) was measured with 2.5× higher pump-to-THz energy conversion efficiency (0.25%) than reported previously with shorter pulses. These results verify the advantage of longer pump pulses and support the expectation that mJ-level THz pulses will be available by cooling the crystal and using large pumped area. |
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