Jump to ContentJump to Main Navigation

Opto-Electronics Review

4 Issues per year

IMPACT FACTOR increased in 2013: 1.279
Rank 118 out of 247 in category Electrical & Electronic Engineering in the 2013 Thomson Reuters Journal Citation Report/Science Edition

SCImago Journal Rank (SJR): 0.531
Source Normalized Impact per Paper (SNIP): 1.209


CW mode locked Nd:YVO4 laser pumped by 20-W laser diode bar

1Military University of Technology

© 2006 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

Citation Information: Opto-Electronics Review. Volume 14, Issue 2, Pages 131–135, ISSN (Online) 1896-3757, DOI: 10.2478/s11772-006-0017-x, June 2006

Publication History

Published Online:


The efficient cw mode locking (cw-ML) regime was demonstrated in Nd:YVO4 laser by means of saturable absorber mirror (SAM). The 0.3-at.% Nd3+ doped 10-mm-long YVO4 crystal end pumped by 20-W diode module with a beam shaper was applied as a gain medium located in the close vicinity to the rear flat mirror of the first arm of Z-type resonator of 316 cm total length with two curved mirrors of 100-cm curvature radii. The SAM of 2%-saturable absorptance and saturation fluence of 50 μJ/cm2 was mounted at the opposite end of a resonator. The developed “dynamically stable” cavity design mitigates detrimental role of thermal aberration in gain medium, enforcing clean perfect mode locking even for the highest pump densities. The cw-ML pulses with 47.5 MHz repetition rate and pulse durations in the range of 15–20 ps were observed for a wide range of pump powers and output coupler losses. In the best case, for 32% of output coupler transmission, up to 6.2 W of average power with near 35% slope efficiency was achieved. The thresholds for Q-switched ML, cw-ML regimes were 2.67 W and 6.13 W of pump power, respectively. For the maximum pump power of 20 W we obtained 133 nJ of pulse energy with 16-ps pulse duration, resulting in a peak power higher than 8 kW. The threshold energy density at SAM giving the QML regime was estimated to be about 30 μJ/cm2, threshold of cw-ML regime was 220 μJ/cm2.

Keywords: diode pumped lasers; mode locking; SESAM

  • [1] A.E. Siegman, Lasers, University Science Books, Mill Valley, California, 1986.

  • [2] W. Koechner, Solid State Laser Engineering, 4th edition, Springer, Berlin, 1996.

  • [3] J.C. Diels and W. Rudolph, Ultrashort Laser Pulse Phenomena, Academic Press London, 1995.

  • [4] U. Keller, K.J. Weingarten, F.X. Kartner, D. Kopf, B. Braun, I.D. Jung, R. Fluck, C. Honninger, N. Matuschek, and J. Aus der Au, “Semiconductor saturable absorber mirrors (SESAMs) for femtosecond to nanosecond pulse generation in solid state lasers”, IEEE J. Sel. Top. Quantum Elect. 2, 435–453 (1996). http://dx.doi.org/10.1109/2944.571743 [CrossRef]

  • [5] U. Keller, “Ultrashort pulse lasers and their applications”, tutorial at EPS-QEOD, Europhoton Conference on Solid State and Fiber Coherent Light Sources, EPFL, Lausanne, 2004.

  • [6] F. Brunner, E. Innerhofer, S.V. Marchese, T. Sudmeyer, R. Paschotta, T. Usami, H. Ito, S. Kurimura, K. Kitamura, G. Arisholm, and U. Keller, “Powerful red-green-blue laser source pumped with thin disk laser”, Opt. Lett. 29, 1921–1923 (2004). http://dx.doi.org/10.1364/OL.29.001921 [CrossRef]

  • [7] K.A. Stankov and J. Jethva, “A new mode locking technique using a nonlinear mirror”, Opt. Commun. 66, 41–46 (1988). http://dx.doi.org/10.1016/0030-4018(88)90201-5 [CrossRef]

  • [8] A. Agnesi, C. Pennacchio, G.C. Reali, and V. Kubecek, “High-power diode-pumped picosecond Nd3+:YVO4 laser”, Opt. Lett. 22, 1645–1647 (1997).

  • [9] V. Kubecek, J. Biegert, J.C. Diels, and M.R. Kokta, “Practical source of 50 ps pulses using flashlamp pumped Nd:YAG laser and passive all-solid state pulse control”, Opt. Commun. 174, 317–321 (2000). http://dx.doi.org/10.1016/S0030-4018(00)00566-6 [CrossRef]

  • [10] V. Kubecek, A. Dombrowsky, J.C. Diels, and A. Stintz, “Mode locked Nd:YAG laser with passive negative feedback using multiple quantum well saturable absorber”, SPIE Proc. 5777, 757–761 (2005).

Comments (0)

Please log in or register to comment.