Simulation of Diode-Pumped Q-Switched Nd:YAG Laser Generating Eye-Safe Signal in IOPO Environment

Mian M. Ashraf, Muhammad Siddique

Institute of Industrial Control System, P .O. Box 1398, Rawalpindi, Pakistan.

DOI: 10.4236/opj.2012.23025                

Abstract

Numerical simulation of diode-pumped Q-switched Nd:YAG laser leading to the generation of eye-safe signal in singly resonant Intracavity Optical Parametric Oscillator (IOPO) is presented. Starting from rate equations, the time dependent laser equations have been solved numerically, whereas the space-dependent OPO equations analytically. Our results show that 1.4 J diode laser (810 nm) pulse with 200 msec width, delivers 30 mJ Nd:YAG laser (1064 nm) pulse with 5 n-second width. This Nd:YAG laser further generates 9 mJ eye safe signal (1570 nm) pulse with 2.5 n-second width.

Keywords

Simulation; Diode Laser; Q-Switched Nd:YAG Laser; Eye-Safe Laser; Signal; Idler; IOPO; Rate Equations; Out-Put Power; KTP Non-Linear Crystal; Pump Beam Waist

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	E. Gregor, D. E. Niieuwsma and R. D. Stultz, “20 Hz Eyesafe Laser Rangefinder for Air Defense,” SPIE Proceedings, Vol. 1207, 1990, pp. 124-134. doi:10.1117/12.17855
[2]	E. Nettleton, B. W. Schilling, D. N. Barr and J. S. Lei, “Monoblock Laser for a Low-Cost, Eyesafe, Microlaser Range Finder,” Applied Optics, Vol. 39, No. 15, 2000, pp. 2428-2432. doi:10.1364/AO.39.002428.
[3]	S. Kuck and K. Petermann, U. Pohlmann, U. Schonhoff and G. Huber, “Tunable Room Temperature Laser Action of Cr4+-doped Y3ScxAl5-xO12,” Vol. 58, No. 2, 1994, pp 153-156.
[4]	N. V. Kuleshov, et al., “Fluorescence Dynamics, ExcitedState Absorption and Stimulated Emission of Er3+ in KY(WO4)2,” Optics InfoBase: Journal of the Optical Society of America B, Vol. 15, No. 3, 1998, pp. 1205-1212. doi:10.1364/JOSAB.15.001205
[5]	I. Sokolska, E. Heumann, S. Kuck and T. Lukasiewicz, “Laser Oscillation of Er3+:YVO4 and Er3+, Yb3+:YVO4 Crystals in the Spectral Range around 1.6 μm,” Applied Physics B, Vol. 71, No. 6, 2000, pp. 893-896.
[6]	A. Sennaroglu, “Broadly Tunable Cr-Doped Solid-State Lasers in the near Infrared and Visible,” Progress in Quantum Electronics, Vol. 26, No. 6, 2002, pp. 287-352. doi:10.1016/S0079-6727(02)00016-2
[7]	P. Cerny, H. Jelinkova, P. G. Zverev and T. T. Basiev, “Solid State Lasers with Raman Frequency Conversion,” Progress in Quantum Electronics, Vol. 28, No. 2, 2004, pp. 113-143. doi:10.1016/j.pquantelec.2003.09.003
[8]	Y. F. Chen, “Compact Efficient All-Solid-State Eye-Safe Laser with Self-Frequency Raman Conversion in a Nd: YVO4 Crystal,” Optics Letters, Vol. 29, No. 18, 2004, pp. 2172-2174. doi:10.1364/OL.29.002172
[9]	Y. F. Chen, “Efficient 1521-11 m Nd:GdVO4 Raman Laser,” Optics Letters, Vol. 29, No. 22, 2004, pp. 26322634. doi:10.1364/OL.29.002632
[10]	J. T. Murray, R. C. Powell, N. Peyghambarian, D. Smith, W. Austin and R. A. Stolzenberger, “Generation of 1.5 μm Radiation through Intracavity Solid State Raman Shifting in Ba(NO3)2 Nonlinear Crystals,” Optics Letters, Vol. 20, No. 9, 1995, pp. 1017-1023. doi:10.1364/OL.20.001017
[11]	Y. Yashkir and H. M. Van Driel, “Passively Q-Switched 1.57-μm Intracavity Optical Parametric Oscillator,” Applied Optics, Vol. 38, No. 12, 1999, pp. 2554-2559. doi:10.1364/AO.38.002554
[12]	A. Agnesi, S. Dell’aequa and G. Reali, “Diode-Pumped Quasi-Cw Intracavity Optical Parametric Oscillator at 1.57 μm with Efficient Pulse Shortening,” Applied Physics B: Lasers and Optics, Vol. 70, No. 6, 2000, pp. 751753. doi:10.1007/PL00021130
[13]	W. Zendzian, J. K. Jabczynski, J. Kwiatkowski and K. Kopczynski, “300-kW, Eye-Safe Intracavity OPO Transmitter,” Proceedings of the SPIE, Vol. 6952, 2008, pp. 69520U-69520U-10.
[14]	F. Jin, G. Zhai, J. Li, N. Ma and S. S. Shi, “All Solid State Eye-Safe Optical Parametric Oscillators,” Laser Technology, Vol. 26, No. 3, 2002, pp. 201-203.
[15]	Y.-Y. Wang, K. Zhong and D.-G. Xu, “High-Energy Pulsed Eye-Safe Intracavity Optical Parametric Oscillator at 1.57 μm,” Proceedings of the SPIE, Vol. 7276, 2008, pp. 727603-727603-8.
[16]	R. Dabu, A. Stratan, C. Fenic, “Intracavity Pumped Nanosecond Optical Parametric Oscillator Emitting in the Eye-Safe Range,” Applied Optics, Vol. 40, No. 24, 2001, pp. 4334-4340.
[17]	J. G. Miao, H. K. Bian and B. S. Wang, “Low Threshold Narrow Pulse Width Intra-Cavity Optical Parametric Oscillator at 1573 nm,” Optics Communications, Vol. 265, No. 1, 2006, pp. 349-353. doi:10.1016/j.optcom.2006.03.040