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Not Available Highly stable, broadly tunable, single-frequency laser sources are needed for a variety of applications including high resolution optical spectroscopy, frequency standards, pumping and seeding of lasers and nonlinear devices, lidar, and hard target laser radar. In this effort, CTI proposes to build broadly tunable, ultra-narrow linewidth lasers capable of generating several hundred mW output power using the Yb:YAG and Yb:YLF hosts. This work will leverage CTI's successful efforts in manufacturing tunable single-frequency Yb:YAG, Tm:YAG, Tm,Ho:YLF, and Tm:LuAG lasers at the 1(magnetic moment)m and 2 (magnetic moment)m wavelengths. These existing lasers fit in the palm of one's hand and provide better than 10 kHz/msec short-term linewidth stability and 5% min peak-to-peak amplitude stability in a TEM (sub 00), near diffraction-limited beam. The Yb:YAG laser outputs over 200 mW and tunes about the 1.03 (magnetic moment)m wavelength region. In this program CTI will increase the output power, tuning range, and stability of our existing Yb:YAG master oscillator and extend the product line to include Yb:YLF. Additionally, to ensure that these lasers will meet the stability requirements needed for applications such as the development of optical frequency standards, CTI will collaborate with researchers at the National Institute of Standards and Technology in Boulder, CO, to establish performance criteria and investigate innovative passive and active stabilization techniques.