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Laser-diode Pumped Intracavity Frequency Doubled Nd:YLF-laser at 455nm

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Abstract

The development of an all-solid-state coherent blue light source is an widely investigated topic nowadays, especially for applications in the display technology. One possibility to realize such a light source is the intracavity frequency doubling of neodymium doped laser crystals at the ground-state transition1,2. In Nd:YLF the laser transition from the 4F3/2- to the 4I9/2- -manifold is at 910nm (Eω ┴ c). This yields in a frequency doubled radiation of 455nm, which is a suitable wavelength for display technology A 1.8mm long Nd:YLF crystal with a dopant concentration of 1% was used in the experiments. The laser crystal high reflection coated at the fundamental wavelength was pumped by a fiber-coupled 10W laser diode at 792nm Nd:YLF posesses a strong absorption for E||c at 792nm. The pump radiation was unpolarized, so that only 47% of the available pump power was absorbed. The laser crystal was mounted on a Peltier-cooler to achieve efficient cooling. Efficient cooling is important to prevent excessive reabsorption losses caused by the thermal population of the lower laser level To reduce the thermal loading of the crystal the laser diode was operated in a quasi cw-mode (50% duty-cycle). A maximum output power of 620mW with a slope efficiency of 17.3% was achieved in a nearly confocal linear resonator with a 0.7% output coupler (Fig. 1)

© 1996 IEEE

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