A tunable injection seeded Ti:sapphire laser source has been developed and tested. Slave-master tandem cavity and ramp-lock-and-fire concepts have been implemented and fully controlled by a digital signal processor. A Fourier-transform-based analysis, as well as direct measurements, have demonstrated spectral linewidths in the range of 3.5–15 MHz (HWHM), with potential tunability over the entire Ti:sapphire lasing range. A quasi-Fourier-transform limited spectral linewidth is demonstrated assuming a secant hyperbolic shape of the electromagnetic field. Output energies >100mJ have been reached with 300mJ of pump energy. The highest spectral purity is obtained using the quadruple pumping scheme.

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The frequency chirp introduced by the pulse amplifier has not been investigated, but it is assumed to be small and negligible for a long natural lifetime medium (Ref. 8), however, a negative shift of 7±5MHz has been reported with a Ti:sapphire laser (Ref. 53).
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