Giant Microphotonics

A stainless steel plate irradiated by the focused microchip laser output in 532nm was ablated and the ablated particles were evaporated. 

As a results of recent micro solid-state photonics, stable mega-watt level giant pulse microchip laser has been demonstrated in a Nd:YAG/Cr4+:YAG composite device. By using the microchip structure, the obtained peak power was close to 1.2 MW for energy of 0.95 mJ with highly beam quality. Up to 0.14 PW/cm2sr brightness and 2x1020 K were obtained with < 20 mW electrical average power supply (cf. Sun: 6,000K). Now, the output energy and brightness were up to 2.7 mJ and 0.3 PW/cm2sr, respectively.

On the other hand, the active mirror configuration (ex. microchip and thin disk) has advantage for power scaling. Addition, the ceramic Yb:YAG/YAG composite structure made simple high power microchip laser head (200-µm thickness, 3.7-mm diameter Yb-doped core): the cw output power of 414W (power densities of 3.9 kW/cm2 and 0.19 MW/cm3) under edge-pumping.

These micro and/or microchip lasers by using advanced ceramics can provide extreme performances as a new generation in solid-state lasers. This high-brightness nature of these lasers has allowed efficient wavelength extension by nonlinear frequency conversion. In addition, the quasi phase matching (QPM) by the periodic domain controlling is an attractive technique for compensating phase velocity dispersion in frequency conversion.

These engineered micro-domain based high-brightness / brightness temperature compact lasers and nonlinear optics, so to speak gGiant Microphotonicsh, are promising. The future may herald new photonics. Moreover, the new generation of micro and/or microchip lasers by using orientation-controlled advanced ceramics can provide extreme performances in solid-state lasers.

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