We demonstrate, for the first time to our knowledge, multikilohertz operation of a double-stage optical parametric chirped pulse amplifier with periodically poled stoichiometric $\mathrm{Li}\mathrm{Ta}{\mathrm{O}}_3$ crystals, seeded by a homemade Cr:forsterite oscillator operating at $1235\mathrm{nm}$ . The repetition rate of the amplifier could easily be tuned without the use of electro-optic modulators by using a repetition-rate-tunable kilohertz pump laser operating at $532\mathrm{nm}$ and a time-synchronization unit. Amplified total $(\text{signal}+\text{idler})$ energies of 55.9 and $36.2\mu \mathrm{J}$ were achieved at 1 and $5\mathrm{kHz}$ , respectively. After recompression, the pulse width of amplified idler pulses at $1235\mathrm{nm}$ amounted to $530\mathrm{fs}$ .

© 2007 Optical Society of America

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