Tunable, high-power, narrow-band picosecond IR radiation by optical parametric amplification in KTP |
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Authors: | K Finsterbusch R Urschel H Zacharias |
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Institution: | Physikalisches Institut, Westf?lische Wilhelms-Universit?t, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany, DE
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Abstract: | We report on an optical parametric amplifier (OPA) based on two potassium titanyl phosphate (KTP) crystals in a walk-off compensating
geometry. An Nd:YLF regenerative amplifier at a 1-kHz repetition rate serves as the pump source. The seed beam is delivered
by a synchronously pumped frequency-stabilized optical parametric oscillator (OPO) based on periodically poled lithium niobate
(PPLN). At pump intensities of about 7 GW/cm2 large amplification factors of more than 104 were achieved, resulting in pulse energies of more than 450 μJ and 350 μJ for the signal and idler pulses, respectively,
at a 1-kHz repetition rate. In the saturation regime the time–bandwidth product increases from two to three times the Fourier
limit, with a pulse duration of 105 ps and a bandwidth of 12.7 GHz at the highest intensities employed.
Received: 2 November 2001 / Published online: 14 March 2002 |
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Keywords: | PACS: 42 65 Re 42 65 Yj 42 72 Ai |
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