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

• Autorzy: Jabczyński J. K. , Żendzian W. , Kwiatkowski J.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

diode pumped lasers; mode locking; SESAM

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2006
• Tom: Vol. 14, No. 2
• Strony: 135--139
• Opis fizyczny: Bibliogr. 35 poz., wykr.

Twórcy

autor

Jabczyński J. K.

autor

Żendzian W.

autor

Kwiatkowski J.

• Institute of Optoelectronics, Military University of Technology, 2 Kaliskiego Str., 00-908 Warsaw,

Bibliografia

• 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).
• 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).
• 7. K.A. Stankov and J. Jethva, "A new mode locking technique using a nonlinear mirror", Opt. Commun. 66, 41-46 (1988).
• 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).
• 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).