Space phase matching and self-frequency-doubling red laser in Nd:GdCOB crystal

✍ Scribed by Xueyuan Hou; Jungang Huang; Yufei Li; Yuming Sun; Lei Pan

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 289 KB
• Volume: 35
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(03)00060-4

✦ Synopsis

By using the calculation theory of the phase-matching direction and e ective nonlinear coe cient of frequency doubling in biaxial crystal, we calculate the e ective nonlinear coe cients at di erent frequency-doubling phase-matching directions of the three main uorescent lines (936, 1060, 1331 nm) of Nd:GdCOB crystal. The space distribution curves of e ective nonlinear coe cient are drawn. Two crystal specimens are cut at the optimal type I phase matching angles: for specimen 1, Â = 65 • , = 34:6 • (the ÿrst octant); for specimen 2, Â = 66:5 • , = 145:5 • (the second octant). When pumped by Datachroom-5000 pulsed dye laser, the output self-frequency-doubling red laser in specimen 2 is 0:62 mJ, and the corresponding conversion e ciency is 2.5%. Under the same pumping condition, the output red laser of specimen 1 is much smaller than that of specimen 2, which is well in agreement with the theoretical calculation.