We describe a simple method for greatly reducing optical phase perturbations in a nanosecond pulsed dye amplifier. The laser dye mix is tailored to produce a susceptibility near zero at the operating wavelength. Frequency shifts are reduced to less than 3 MHz, and frequency chirping to less than 10 MHz, without significant loss of amplified power. This technique has been used to improve the accuracy of precision far-UV wavelength measurements in H<sub>2</sub> to ~7 parts in 10<sup>9</sup>.
© 1997 Optical Society of America
E. E. Eyler, A. Yiannopoulou, S. Gangopadhyay, and N. Melikechi, "Chirp-free nanosecond laser amplifier for precision spectroscopy," Opt. Lett. 22, 49-51 (1997)