Abstract

A compact, high-power, and high-stability Nd:YVO4 laser at 1342 nm has been developed. As high as 11 W cw output for 35 W of incident pump power with a slope efficiency of about 31.4% has been obtained. It has been shown that a reasonable and effective way to improve the output power is to choose a pumping scheme that can effectively extend the range of the stable resonator region by choosing the optimal dopant concentration and length of the laser rod.

© 2005 Optical Society of America

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References

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  1. W. L. Nighan, D. Dudley, and M. S. Keirstead, "Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at 750% efficiency," in Conference on Lasers and Electro-optics, Vol. 15 of 1995 OSA Technical Digist Series (Optical Society of America, 1995), p. 17.
  2. A. B. Peterson and W. L. Nighan, "A high-power, diode-pumped 1342 nm laser system for micromachining applications," in Conference on Lasers and Electro-Optics, Vol. 8 of OSA Technical Digest Series (Optical Society of America, 1998), pp. 454-455.
  3. A. Agnesi, A. Guandalini, and G. Reali, "Efficient 671 nm pump source by intravity doubling of a diode-pumped Nd:YVO4 laser," J. Opt. Soc. Am. B 19, 1078-1083 (2002).
    [CrossRef]
  4. A. Sennaroglu, "Efficient continuous-wave operation of a diode-pumped Nd:YVO4 laser at 1342 nm," Opt. Commun. 164, 191-197 (1999).
    [CrossRef]
  5. Y. F. Chen, T. M. Huang, C. C. Liao, Y. P. Lan, and S. C. Wang, "Efficient high-power diode-end-pumped TEM00Nd:YVO4 laser," IEEE Photonics Technol. Lett. 11, 1241-1243 (1999).
    [CrossRef]
  6. H. Ogilvy, M. J. Withford, P. Dekker, and J. A. Piper, "Efficient diode double-end-pumped Nd:YVO4 laser operating at 1342 nm," Opt. Express 11, 2411-2415 (2003).
    [CrossRef] [PubMed]
  7. A. DiLieto, P. Minguzzi, A. Pirastu, and V. Magni, "High-power diffraction-limited Nd:YVO4 continuous-wave lasers at 1.34 µm," IEEE J. Quantum Electron. QE-39, 903-909 (2003).
    [CrossRef]
  8. W. Koechner, Solid-State Laser Engineering (Springer-Verlag, 2000).
  9. A. K. Cousins, "Temperature and thermal stress scaling in finite-length end-pumped lasers rods," IEEE J. Quantum Electron. QE-28, 1057-1069 (1992).
    [CrossRef]
  10. X. Y. Peng, L. Xu, and A. Asundi, "Power scaling of diode-pumped Nd:YVO4 laser," IEEE J. Quantum Electron. QE-38, 1291-1299 (2002).
    [CrossRef]
  11. M. E. Innocenzi, H. T. Yura, C. L. Fincher, and R. A. Fields, "Thermal modeling of continuous-wave end-pumped solid-state lasers," Appl. Phys. Lett. 56, 19-20 (1990).
    [CrossRef]
  12. W. A. Clarkson, "Thermal effects and their mitigation in end-pumped solid-state lasers," J. Phys. D 34, 2381-2395 (2001).
    [CrossRef]
  13. F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
    [CrossRef]
  14. P. Laures, "Geometrical approach to Gaussian beam propagation," Appl. Opt. 6, 747-755 (1967).
    [CrossRef] [PubMed]
  15. Y. F. Chen, T. M. Huang, C. F. Kao, C. L. Wang, and S. C. Wang, "Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power influence of thermal effect," IEEE J. Quantum Electron. QE-33, 1424-1429 (1997).
    [CrossRef]
  16. F. Hajiemaeilbaigi, A. Koohian, and M. Mahdizadeh, "Design criteria in fibre-coupled end-pumped laser with small active medium," J. Opt. A 4, 52-56 (2002).
    [CrossRef]
  17. W. Koechner, Solid-State Laser Engineering (Springer-Verlag, 2000).
  18. D. Findly and R. A. Clay, "The measurement of internal losses in 4-level lasers," Phys. Lett. 20, 277-278 (1966).
    [CrossRef]
  19. P. Laporta and M. Brussard, "Design criteria for mode size optimization in diode-pumped solid-state lasers," IEEE J. Quantum Electron. QE-27, 2319-2326 (1991).
    [CrossRef]

2003 (2)

A. DiLieto, P. Minguzzi, A. Pirastu, and V. Magni, "High-power diffraction-limited Nd:YVO4 continuous-wave lasers at 1.34 µm," IEEE J. Quantum Electron. QE-39, 903-909 (2003).
[CrossRef]

H. Ogilvy, M. J. Withford, P. Dekker, and J. A. Piper, "Efficient diode double-end-pumped Nd:YVO4 laser operating at 1342 nm," Opt. Express 11, 2411-2415 (2003).
[CrossRef] [PubMed]

2002 (4)

A. Agnesi, A. Guandalini, and G. Reali, "Efficient 671 nm pump source by intravity doubling of a diode-pumped Nd:YVO4 laser," J. Opt. Soc. Am. B 19, 1078-1083 (2002).
[CrossRef]

X. Y. Peng, L. Xu, and A. Asundi, "Power scaling of diode-pumped Nd:YVO4 laser," IEEE J. Quantum Electron. QE-38, 1291-1299 (2002).
[CrossRef]

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

F. Hajiemaeilbaigi, A. Koohian, and M. Mahdizadeh, "Design criteria in fibre-coupled end-pumped laser with small active medium," J. Opt. A 4, 52-56 (2002).
[CrossRef]

2001 (1)

W. A. Clarkson, "Thermal effects and their mitigation in end-pumped solid-state lasers," J. Phys. D 34, 2381-2395 (2001).
[CrossRef]

1999 (2)

A. Sennaroglu, "Efficient continuous-wave operation of a diode-pumped Nd:YVO4 laser at 1342 nm," Opt. Commun. 164, 191-197 (1999).
[CrossRef]

Y. F. Chen, T. M. Huang, C. C. Liao, Y. P. Lan, and S. C. Wang, "Efficient high-power diode-end-pumped TEM00Nd:YVO4 laser," IEEE Photonics Technol. Lett. 11, 1241-1243 (1999).
[CrossRef]

1997 (1)

Y. F. Chen, T. M. Huang, C. F. Kao, C. L. Wang, and S. C. Wang, "Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power influence of thermal effect," IEEE J. Quantum Electron. QE-33, 1424-1429 (1997).
[CrossRef]

1992 (1)

A. K. Cousins, "Temperature and thermal stress scaling in finite-length end-pumped lasers rods," IEEE J. Quantum Electron. QE-28, 1057-1069 (1992).
[CrossRef]

1991 (1)

P. Laporta and M. Brussard, "Design criteria for mode size optimization in diode-pumped solid-state lasers," IEEE J. Quantum Electron. QE-27, 2319-2326 (1991).
[CrossRef]

1990 (1)

M. E. Innocenzi, H. T. Yura, C. L. Fincher, and R. A. Fields, "Thermal modeling of continuous-wave end-pumped solid-state lasers," Appl. Phys. Lett. 56, 19-20 (1990).
[CrossRef]

1967 (1)

1966 (1)

D. Findly and R. A. Clay, "The measurement of internal losses in 4-level lasers," Phys. Lett. 20, 277-278 (1966).
[CrossRef]

Agnesi, A.

Asundi, A.

X. Y. Peng, L. Xu, and A. Asundi, "Power scaling of diode-pumped Nd:YVO4 laser," IEEE J. Quantum Electron. QE-38, 1291-1299 (2002).
[CrossRef]

Brussard, M.

P. Laporta and M. Brussard, "Design criteria for mode size optimization in diode-pumped solid-state lasers," IEEE J. Quantum Electron. QE-27, 2319-2326 (1991).
[CrossRef]

Chen, Y. F.

Y. F. Chen, T. M. Huang, C. C. Liao, Y. P. Lan, and S. C. Wang, "Efficient high-power diode-end-pumped TEM00Nd:YVO4 laser," IEEE Photonics Technol. Lett. 11, 1241-1243 (1999).
[CrossRef]

Y. F. Chen, T. M. Huang, C. F. Kao, C. L. Wang, and S. C. Wang, "Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power influence of thermal effect," IEEE J. Quantum Electron. QE-33, 1424-1429 (1997).
[CrossRef]

Clarkson, W. A.

W. A. Clarkson, "Thermal effects and their mitigation in end-pumped solid-state lasers," J. Phys. D 34, 2381-2395 (2001).
[CrossRef]

Clay, R. A.

D. Findly and R. A. Clay, "The measurement of internal losses in 4-level lasers," Phys. Lett. 20, 277-278 (1966).
[CrossRef]

Cousins, A. K.

A. K. Cousins, "Temperature and thermal stress scaling in finite-length end-pumped lasers rods," IEEE J. Quantum Electron. QE-28, 1057-1069 (1992).
[CrossRef]

Dekker, P.

DiLieto, A.

A. DiLieto, P. Minguzzi, A. Pirastu, and V. Magni, "High-power diffraction-limited Nd:YVO4 continuous-wave lasers at 1.34 µm," IEEE J. Quantum Electron. QE-39, 903-909 (2003).
[CrossRef]

Ding, X.

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

Dudley, D.

W. L. Nighan, D. Dudley, and M. S. Keirstead, "Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at 750% efficiency," in Conference on Lasers and Electro-optics, Vol. 15 of 1995 OSA Technical Digist Series (Optical Society of America, 1995), p. 17.

Fields, R. A.

M. E. Innocenzi, H. T. Yura, C. L. Fincher, and R. A. Fields, "Thermal modeling of continuous-wave end-pumped solid-state lasers," Appl. Phys. Lett. 56, 19-20 (1990).
[CrossRef]

Fincher, C. L.

M. E. Innocenzi, H. T. Yura, C. L. Fincher, and R. A. Fields, "Thermal modeling of continuous-wave end-pumped solid-state lasers," Appl. Phys. Lett. 56, 19-20 (1990).
[CrossRef]

Findly, D.

D. Findly and R. A. Clay, "The measurement of internal losses in 4-level lasers," Phys. Lett. 20, 277-278 (1966).
[CrossRef]

Guandalini, A.

Hajiemaeilbaigi, F.

F. Hajiemaeilbaigi, A. Koohian, and M. Mahdizadeh, "Design criteria in fibre-coupled end-pumped laser with small active medium," J. Opt. A 4, 52-56 (2002).
[CrossRef]

Huang, T. M.

Y. F. Chen, T. M. Huang, C. C. Liao, Y. P. Lan, and S. C. Wang, "Efficient high-power diode-end-pumped TEM00Nd:YVO4 laser," IEEE Photonics Technol. Lett. 11, 1241-1243 (1999).
[CrossRef]

Y. F. Chen, T. M. Huang, C. F. Kao, C. L. Wang, and S. C. Wang, "Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power influence of thermal effect," IEEE J. Quantum Electron. QE-33, 1424-1429 (1997).
[CrossRef]

Innocenzi, M. E.

M. E. Innocenzi, H. T. Yura, C. L. Fincher, and R. A. Fields, "Thermal modeling of continuous-wave end-pumped solid-state lasers," Appl. Phys. Lett. 56, 19-20 (1990).
[CrossRef]

Kao, C. F.

Y. F. Chen, T. M. Huang, C. F. Kao, C. L. Wang, and S. C. Wang, "Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power influence of thermal effect," IEEE J. Quantum Electron. QE-33, 1424-1429 (1997).
[CrossRef]

Keirstead, M. S.

W. L. Nighan, D. Dudley, and M. S. Keirstead, "Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at 750% efficiency," in Conference on Lasers and Electro-optics, Vol. 15 of 1995 OSA Technical Digist Series (Optical Society of America, 1995), p. 17.

Koechner, W.

W. Koechner, Solid-State Laser Engineering (Springer-Verlag, 2000).

W. Koechner, Solid-State Laser Engineering (Springer-Verlag, 2000).

Koohian, A.

F. Hajiemaeilbaigi, A. Koohian, and M. Mahdizadeh, "Design criteria in fibre-coupled end-pumped laser with small active medium," J. Opt. A 4, 52-56 (2002).
[CrossRef]

Lan, Y. P.

Y. F. Chen, T. M. Huang, C. C. Liao, Y. P. Lan, and S. C. Wang, "Efficient high-power diode-end-pumped TEM00Nd:YVO4 laser," IEEE Photonics Technol. Lett. 11, 1241-1243 (1999).
[CrossRef]

Laporta, P.

P. Laporta and M. Brussard, "Design criteria for mode size optimization in diode-pumped solid-state lasers," IEEE J. Quantum Electron. QE-27, 2319-2326 (1991).
[CrossRef]

Laures, P.

Leigh, M.

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

Liao, C. C.

Y. F. Chen, T. M. Huang, C. C. Liao, Y. P. Lan, and S. C. Wang, "Efficient high-power diode-end-pumped TEM00Nd:YVO4 laser," IEEE Photonics Technol. Lett. 11, 1241-1243 (1999).
[CrossRef]

Magni, V.

A. DiLieto, P. Minguzzi, A. Pirastu, and V. Magni, "High-power diffraction-limited Nd:YVO4 continuous-wave lasers at 1.34 µm," IEEE J. Quantum Electron. QE-39, 903-909 (2003).
[CrossRef]

Mahdizadeh, M.

F. Hajiemaeilbaigi, A. Koohian, and M. Mahdizadeh, "Design criteria in fibre-coupled end-pumped laser with small active medium," J. Opt. A 4, 52-56 (2002).
[CrossRef]

Minguzzi, P.

A. DiLieto, P. Minguzzi, A. Pirastu, and V. Magni, "High-power diffraction-limited Nd:YVO4 continuous-wave lasers at 1.34 µm," IEEE J. Quantum Electron. QE-39, 903-909 (2003).
[CrossRef]

Nighan, W. L.

W. L. Nighan, D. Dudley, and M. S. Keirstead, "Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at 750% efficiency," in Conference on Lasers and Electro-optics, Vol. 15 of 1995 OSA Technical Digist Series (Optical Society of America, 1995), p. 17.

A. B. Peterson and W. L. Nighan, "A high-power, diode-pumped 1342 nm laser system for micromachining applications," in Conference on Lasers and Electro-Optics, Vol. 8 of OSA Technical Digest Series (Optical Society of America, 1998), pp. 454-455.

Ogilvy, H.

Peng, X. Y.

X. Y. Peng, L. Xu, and A. Asundi, "Power scaling of diode-pumped Nd:YVO4 laser," IEEE J. Quantum Electron. QE-38, 1291-1299 (2002).
[CrossRef]

Peterson, A. B.

A. B. Peterson and W. L. Nighan, "A high-power, diode-pumped 1342 nm laser system for micromachining applications," in Conference on Lasers and Electro-Optics, Vol. 8 of OSA Technical Digest Series (Optical Society of America, 1998), pp. 454-455.

Peyghambarian, N.

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

Piper, J. A.

Pirastu, A.

A. DiLieto, P. Minguzzi, A. Pirastu, and V. Magni, "High-power diffraction-limited Nd:YVO4 continuous-wave lasers at 1.34 µm," IEEE J. Quantum Electron. QE-39, 903-909 (2003).
[CrossRef]

Reali, G.

Sennaroglu, A.

A. Sennaroglu, "Efficient continuous-wave operation of a diode-pumped Nd:YVO4 laser at 1342 nm," Opt. Commun. 164, 191-197 (1999).
[CrossRef]

Song, F.

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

Wang, C. L.

Y. F. Chen, T. M. Huang, C. F. Kao, C. L. Wang, and S. C. Wang, "Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power influence of thermal effect," IEEE J. Quantum Electron. QE-33, 1424-1429 (1997).
[CrossRef]

Wang, S. C.

Y. F. Chen, T. M. Huang, C. C. Liao, Y. P. Lan, and S. C. Wang, "Efficient high-power diode-end-pumped TEM00Nd:YVO4 laser," IEEE Photonics Technol. Lett. 11, 1241-1243 (1999).
[CrossRef]

Y. F. Chen, T. M. Huang, C. F. Kao, C. L. Wang, and S. C. Wang, "Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power influence of thermal effect," IEEE J. Quantum Electron. QE-33, 1424-1429 (1997).
[CrossRef]

Withford, M. J.

Xu, J.

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

Xu, L.

X. Y. Peng, L. Xu, and A. Asundi, "Power scaling of diode-pumped Nd:YVO4 laser," IEEE J. Quantum Electron. QE-38, 1291-1299 (2002).
[CrossRef]

Yura, H. T.

M. E. Innocenzi, H. T. Yura, C. L. Fincher, and R. A. Fields, "Thermal modeling of continuous-wave end-pumped solid-state lasers," Appl. Phys. Lett. 56, 19-20 (1990).
[CrossRef]

Zhang, C.

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

Zhang, G.

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

Appl. Opt. (1)

Appl. Phys. Lett. (2)

M. E. Innocenzi, H. T. Yura, C. L. Fincher, and R. A. Fields, "Thermal modeling of continuous-wave end-pumped solid-state lasers," Appl. Phys. Lett. 56, 19-20 (1990).
[CrossRef]

F. Song, C. Zhang, X. Ding, J. Xu, G. Zhang, M. Leigh, and N. Peyghambarian, "Determination of thermal focal length and pumping radius in gain medium in laser-diode-pumped Nd:YVO4 lasers," Appl. Phys. Lett. 81, 2145-2147 (2002).
[CrossRef]

IEEE J. Quantum Electron. (5)

A. DiLieto, P. Minguzzi, A. Pirastu, and V. Magni, "High-power diffraction-limited Nd:YVO4 continuous-wave lasers at 1.34 µm," IEEE J. Quantum Electron. QE-39, 903-909 (2003).
[CrossRef]

A. K. Cousins, "Temperature and thermal stress scaling in finite-length end-pumped lasers rods," IEEE J. Quantum Electron. QE-28, 1057-1069 (1992).
[CrossRef]

X. Y. Peng, L. Xu, and A. Asundi, "Power scaling of diode-pumped Nd:YVO4 laser," IEEE J. Quantum Electron. QE-38, 1291-1299 (2002).
[CrossRef]

P. Laporta and M. Brussard, "Design criteria for mode size optimization in diode-pumped solid-state lasers," IEEE J. Quantum Electron. QE-27, 2319-2326 (1991).
[CrossRef]

Y. F. Chen, T. M. Huang, C. F. Kao, C. L. Wang, and S. C. Wang, "Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power influence of thermal effect," IEEE J. Quantum Electron. QE-33, 1424-1429 (1997).
[CrossRef]

IEEE Photonics Technol. Lett. (1)

Y. F. Chen, T. M. Huang, C. C. Liao, Y. P. Lan, and S. C. Wang, "Efficient high-power diode-end-pumped TEM00Nd:YVO4 laser," IEEE Photonics Technol. Lett. 11, 1241-1243 (1999).
[CrossRef]

J. Opt. A (1)

F. Hajiemaeilbaigi, A. Koohian, and M. Mahdizadeh, "Design criteria in fibre-coupled end-pumped laser with small active medium," J. Opt. A 4, 52-56 (2002).
[CrossRef]

J. Opt. Soc. Am. B (1)

J. Phys. D (1)

W. A. Clarkson, "Thermal effects and their mitigation in end-pumped solid-state lasers," J. Phys. D 34, 2381-2395 (2001).
[CrossRef]

Opt. Commun. (1)

A. Sennaroglu, "Efficient continuous-wave operation of a diode-pumped Nd:YVO4 laser at 1342 nm," Opt. Commun. 164, 191-197 (1999).
[CrossRef]

Opt. Express (1)

Phys. Lett. (1)

D. Findly and R. A. Clay, "The measurement of internal losses in 4-level lasers," Phys. Lett. 20, 277-278 (1966).
[CrossRef]

Other (4)

W. Koechner, Solid-State Laser Engineering (Springer-Verlag, 2000).

W. L. Nighan, D. Dudley, and M. S. Keirstead, "Diode-bar-pumped Nd:YVO4 lasers with >13-W TEM00 output at 750% efficiency," in Conference on Lasers and Electro-optics, Vol. 15 of 1995 OSA Technical Digist Series (Optical Society of America, 1995), p. 17.

A. B. Peterson and W. L. Nighan, "A high-power, diode-pumped 1342 nm laser system for micromachining applications," in Conference on Lasers and Electro-Optics, Vol. 8 of OSA Technical Digest Series (Optical Society of America, 1998), pp. 454-455.

W. Koechner, Solid-State Laser Engineering (Springer-Verlag, 2000).

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Figures (8)

Fig. 1
Fig. 1

Calculated thermal distribution (in Celsius) at the longitudinal cross section of laser crystal: (top) single-end-pumped case and (bottom) double-end-pumped case. The vertical axis represents the temperature distribution along the z direction; the horizontal axis represents the distribution along the laser propagation along the x direction in laser crystal.

Fig. 2
Fig. 2

Measured thermal focal lengths versus incident pump power for double-end pumping (squares) and single-end pumping (circles). Curves are the fitted results.

Fig. 3
Fig. 3

Experiment setup for a symmetrical cavity. The parameters of the cavity are the same for both double pumping and single pumping. F.S. is the focusing system; mirrors M1, M2, M3, and M4 are plane mirrors.

Fig. 4
Fig. 4

Calculated radius of the pump beam versus thermal focal length. The vertical axis represents the TEM 00 mode size at the laser crystal end surface; the horizontal axis represents the thermal focal length.

Fig. 5
Fig. 5

Maximum 1342 nm output power versus different arm lengths for different OC transmissions.

Fig. 6
Fig. 6

The 1342 nm output power versus pump power. The dots are experimental results, and the line is the corresponding theoretic result derived from Eqs. (3, 4, 5, 6).

Fig. 7
Fig. 7

Spatial distribution of the output beam for the output power of 9 W.

Fig. 8
Fig. 8

Measured values of M 2 factor as a function of ω ω 0 .

Equations (6)

Equations on this page are rendered with MathJax. Learn more.

f T = π K c ω p 2 P a ( d n d T ) [ 1 1 exp ( α l ) ] ,
T opt = L [ ( 2 g 0 l ) L ] 1 2 1 ,
P out = η α h ν h ν p T δ J 1 2 J 2 ( P in P th ) ,
J 1 = 2 π L ( w ¯ p 2 + w 0 2 ) ,
J 2 = 4 π 2 w 0 2 L 2 ( w 0 2 + 2 w ¯ p 2 ) ,
w ¯ p = [ 1 l 0 1 w p 2 ( z ) d z ] 1 2 ,

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