Showing papers by "Norman P. Barnes published in 1987"
TL;DR: In this paper, the performance of Nd in various hosts including Nd:YAG, nd:YLF, nding:BEL, and nding-Cr:GSGG were characterized and compared for operation on the nominal 1.06 μm and 1.33 μm transitions.
Abstract: Performances of Nd in various hosts including Nd:YAG, Nd:YLF, Nd:BEL, and Nd:Cr:GSGG were characterized and compared for operation on the nominal 1.06 μm and 1.33 μm transitions. Comparison included continuous mode operation, normal mode operation, Q -switched operation, and gain measurements. Continuous lasing of Nd:Cr:GSGG under lamp pumping is reported for what may be the first time. Characterization included operation with different mirror reflectivities to obtain the internal losses, measurement of the upper laser level lifetime, measurement of the beam quality of the lasers operating under nominally similar circumstances, and measurement of the wavelength. These measurements should provide a comparison of the various Nd hosts under similar circumstances for a wide variety of operational modes and at both wavelengths of interest.
46 citations
26 Oct 1987
TL;DR: In this article, the authors investigated the operation of the Ti:Al2O3 in a Master Oscillator Power Amplifier (MOPA) configuration and measured gain and energy extraction as a function of probe and pump fluences.
Abstract: Spaceborne remote sensing laser energy requirements exceed 1 joule per pulse for some applications. To meet this requirement, NASA Langley is currently investigating the operation of Ti:Al2O3 in Master Oscillator Power Amplifier (MOPA) configurations. Measurements of two important aspects of the power amplifier, gain and energy extraction, have been performed as a function of probe and pump fluences for the combinations of Gaussian pump with both circular and Gaussian probe beam profiles. In addition, the timing between the probe and pump pulses necessary for optimum extraction from the amplifier has been determined.
1 citations
26 Oct 1987
TL;DR: In this article, a self-injection locking is used to produce the narrow spectral bandwidths required for accurate remote sensing applications, where either a power oscillator or a master oscillator and power amplifier approach is exploited.
Abstract: Self-injection locking is a versatile method of producing the narrow spectral bandwidths required for accurate remote sensing applications. As remote sensing applications require laser energies on the order of 1.0 J/pulse, either a power oscillator or a master oscillator and power amplifier approach could be exploited. Since Ti:Al2O3 has a high gain, the latter concept can be employed to advantage.
1 citations