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We demonstrate a passively Q-switched solid-state laser operating at the central wavelength of 1342 nm based on gold nanobipyramids (Au-NBPs) as saturable absorber (SA) for the first time. Au-NBPs are fabricated through a seed-mediated growth method, and placed in a simple linear cavity. Under an absorbed diode-pumped power of 5.339 W, an average power of 175 mW was generated with a minimum pulse width of 342 ns and a repetition rate of 141.8 kHz, corresponding to a pulse energy of 1.23 μ J. [ABSTRACT FROM AUTHOR]

Photothermal effects in a holographic medium of calcium fluoride crystals with color centers $$(\hbox {CaF}_{2})$$ are discussed. It is shown that photochromism of this crystal makes it possible to record volume holograms within its volume and to change their physical properties by photothermal treatments. The diffusion-drift mechanism of a hologram recording in $$\hbox {CaF}_{2}$$ includes the conversion of centers and their redistribution over the crystal bulk. Depending on the readout wavelength, it is possible to read out amplitude, amplitude phase, or phase holograms. The opportunity to record thick holograms in $$\hbox {CaF}_{2}$$ and their high resistance with respect to non-coherent illumination at an elevated temperature allows forming narrow-band angular and spectral holographic filters in $$\hbox {CaF}_{2}$$ . [ABSTRACT FROM AUTHOR]

Abstract: A tunable narrow line-width LiF:F2 − color center laser with a Littman cavity pumped by an LD pumped Nd:YVO4 acousto-optically Q-switched laser with 30kHz pulse repetition rate was demonstrated. Under the pumped power of 0.82W, the tuning range was from 1110nm to 1215nm and the maximal average output power was 18.5mW at the wavelength of 1150nm. Stable single longitudinal mode LiF:F2 − CC laser operation was achieved with a Fabry–Perot etalon and a beam expander inside the cavity and the line-width was less than 1.5GHz. [Copyright &y& Elsevier]