Dr. Weimin Du Profile

Dr. Weimin Du

at Peking Univ

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SPIE Journal Paper | 1 June 2004

Study of diode-laser pumped self-Q-switched intracavity-doubled laser of Cr4+Nd3+:YAG plus KNbO3 material

Xiaobo Chen, Ling Wang, Jane Zhu, Lan-Bin Lv, Zhiguo Zhang, Guo-Zhen Yang, Weimin Du, Daozhong Zhang

OE, Vol. 43, Issue 06, (June 2004) https://doi.org/10.1117/12.10.1117/1.1646183

KEYWORDS: Chromium, Neodymium, Pulsed laser operation, Nd:YAG lasers, Semiconductor lasers, Ions, Crystals, Laser crystals, Transmission electron microscopy, Absorption

Read Abstract +

A diode-laser pumped blue intracavity frequency-doubled self-Q-switched microchip laser of a chromium Cr4+ Neodymium Nd3+ codoped yttrium aluminum garnet crystal (Cr4+Nd3+:YAG) combined with a potassium niobate (KNbO3) crystal is developed. By coating the cavity mirrors with the films that suppress the 1064-nm operation and enhance the 946-nm laser, the 4F3/24I9/2 transition of the Nd3+ ion is facilitated to achieve the 946-nm laser oscillation. The 946-nm laser of the Cr4+Nd3+:YAG is self-Q-switched due to the saturable absorption of the Cr4+ ion. The full width at half maximum (FWHM) of the laser pulse at a 964-nm wavelength is about 5.07 ns. A self-Q-switched 473-nm laser pulse is sequentially obtained through intracavity frequency doubling of the 946-nm laser by the KNbO3 crystal, whose FWHM is about 4.30 ns. The 473-nm intracavity doubled laser has a good fundamental transverse TEM00 mode, because the self-Q-switched 946-nm laser has a good TEM00 mode that results from the absorption bleaching established by both the 808-nm pump laser and 946-nm oscillating laser. The constant FWHM results from both the response time of the self-Q-switching and the establishing time of the oscillating laser being much faster than the accumulated time of the pump laser energy. The constant peak power of the 946-nm self-Q-switched laser mainly depends on the modulation ability of the self-Q-switching.

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