Abstract

A 10-W laser-diode bar, a multistripe monolithic laser-diode array, has been used to end pump Nd:YAG. Twelve beams emitted from 12 stripes, spaced 800 μm apart, of a 1-cm linear diode array were collimated with a multiprism array consisting of 14 prismlets with 800-μm width to pump the Nd:YAG facet. The maximum Nd:YAG cw output power at 1064 nm of 3 W was obtained at 10-W laser-diode-bar power with a slope efficiency of 35%, and a TEM00 spatial mode with values of beam-quality factor M 2 of 1.29 and 1.76 in the planes perpendicular and parallel to the junction, respectively. A pulse width of 25.2 ns (1-kHz repetition) was obtained in acousto-optic Q-switched operation.

© 1996 Optical Society of America

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  1. T. Y. Fan, A. Sanchez, W. E. DeFeo, “Scalable, end-pumped, diode-laser-pumped laser,” Opt. Lett. 14, 1057–1059 (1989).
  2. T. Y. Fan, A. Sanchez, “Pump source requirements for end-pumped lasers,” IEEE J. Quantum Electron. 26, 311–316 (1990).
  3. S. C. Tidwell, J. F. Seamans, M. S. Bowers, A. K. Cousins, “Scaling cw diode-end-pumped Nd:YAG lasers to high average powers,” IEEE J. Quantum Electron. 28, 997–1009 (1992).
  4. S. C. Tidwell, J. F. Seamans, M. S. Bowers, “Highly efficient 60-W TEM00 cw diode-end-pumped Nd:YAG laser,” Opt. Lett. 18, 116–118 (1993).
  5. D. C. Shannon, R. W. Wallace, “High-power Nd:YAG laser end pumped by a cw, 10 mm × 1 μm aperture, 10-W laser-diode bar,” Opt. Lett. 16, 318–320 (1991).
  6. C. F. Rae, J. A. C. Terry, B. D. Sinclair, M. H. Dunn, W. Sibbett, “Single-frequency, end-pumped Nd:YLF laser excited by a 12-mJ diode-laser array,” Opt. Lett. 17, 1673–1675 (1992).
  7. H. R. Verdún, T. Chuang, “Efficient TEM00-mode operation of a Nd:YAG laser end pumped by a three-bar high-power diode-laser array,” Opt. Lett. 17, 1000–1002 (1992).
  8. J. R. Leger, W. C. Goltsos, “Geometrical transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).
  9. H. Zbinden, J. E. Balmer, “Q-switched Nd:YLF laser end pumped by a diode-laser bar,” Opt. Lett. 15, 1014–1016 (1990).
  10. Th. Graf, J. E. Balmer, “High-power Nd:YLF laser end pumped by a diode-laser bar,” Opt. Lett. 18, 1317–1319 (1993).
  11. H. Hemmati, J. R. Lesh, “3.5-W Q-switched 532-nm Nd:YAG laser pumped with fiber-coupled diode lasers,” Opt. Lett. 19, 1322–1324 (1994).
  12. S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).
  13. T. S. Rose, J. S. Swenson, D. A. Hinkley, R. A. Fields, “Efficient laser performance using a micro-optic based pump source,” in Advanced Solid-State Lasers, T. Y. Fan, B. Chai, eds., Vol. 20 of OSA Proceedings (Optical Society of America, Washington, D.C., 1994), pp. 276–279.
  14. G. Feugnet, C. Bussac, C. Larat, M. Schwarz, J. P. Pocholle, “High-efficiency TEM00 Nd:YVO4 laser longitudinally pumped by a high-power array,” Opt. Lett. 20, 157–159 (1995).
  15. M. Sakamoto, D. F. Welch, J. G. Endriz, D. R. Scifres, W. Streifer, “76 W cw monolithic laser diode arrays,” Appl. Phys. Lett. 54, 2299–2300 (1989).
  16. S. Yamaguchi, T. Kobayashi, Y. Saito, K. Chiba, “Collimation of emissions from a high-power multistripe laser-diode bar with multiprism array coupling and focusing to a small spot,” Opt. Lett. 20, 898–900 (1995).

1995 (2)

1994 (1)

1993 (2)

1992 (5)

C. F. Rae, J. A. C. Terry, B. D. Sinclair, M. H. Dunn, W. Sibbett, “Single-frequency, end-pumped Nd:YLF laser excited by a 12-mJ diode-laser array,” Opt. Lett. 17, 1673–1675 (1992).

H. R. Verdún, T. Chuang, “Efficient TEM00-mode operation of a Nd:YAG laser end pumped by a three-bar high-power diode-laser array,” Opt. Lett. 17, 1000–1002 (1992).

J. R. Leger, W. C. Goltsos, “Geometrical transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).

S. C. Tidwell, J. F. Seamans, M. S. Bowers, A. K. Cousins, “Scaling cw diode-end-pumped Nd:YAG lasers to high average powers,” IEEE J. Quantum Electron. 28, 997–1009 (1992).

S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).

1991 (1)

1990 (2)

T. Y. Fan, A. Sanchez, “Pump source requirements for end-pumped lasers,” IEEE J. Quantum Electron. 26, 311–316 (1990).

H. Zbinden, J. E. Balmer, “Q-switched Nd:YLF laser end pumped by a diode-laser bar,” Opt. Lett. 15, 1014–1016 (1990).

1989 (2)

T. Y. Fan, A. Sanchez, W. E. DeFeo, “Scalable, end-pumped, diode-laser-pumped laser,” Opt. Lett. 14, 1057–1059 (1989).

M. Sakamoto, D. F. Welch, J. G. Endriz, D. R. Scifres, W. Streifer, “76 W cw monolithic laser diode arrays,” Appl. Phys. Lett. 54, 2299–2300 (1989).

Balmer, J. E.

Bowers, M. S.

S. C. Tidwell, J. F. Seamans, M. S. Bowers, “Highly efficient 60-W TEM00 cw diode-end-pumped Nd:YAG laser,” Opt. Lett. 18, 116–118 (1993).

S. C. Tidwell, J. F. Seamans, M. S. Bowers, A. K. Cousins, “Scaling cw diode-end-pumped Nd:YAG lasers to high average powers,” IEEE J. Quantum Electron. 28, 997–1009 (1992).

Bussac, C.

Chiba, K.

Chuang, T.

Cousins, A. K.

S. C. Tidwell, J. F. Seamans, M. S. Bowers, A. K. Cousins, “Scaling cw diode-end-pumped Nd:YAG lasers to high average powers,” IEEE J. Quantum Electron. 28, 997–1009 (1992).

DeFeo, W. E.

Dunn, M. H.

Endriz, J. G.

M. Sakamoto, D. F. Welch, J. G. Endriz, D. R. Scifres, W. Streifer, “76 W cw monolithic laser diode arrays,” Appl. Phys. Lett. 54, 2299–2300 (1989).

Fan, T. Y.

T. Y. Fan, A. Sanchez, “Pump source requirements for end-pumped lasers,” IEEE J. Quantum Electron. 26, 311–316 (1990).

T. Y. Fan, A. Sanchez, W. E. DeFeo, “Scalable, end-pumped, diode-laser-pumped laser,” Opt. Lett. 14, 1057–1059 (1989).

Feugnet, G.

Fields, R. A.

T. S. Rose, J. S. Swenson, D. A. Hinkley, R. A. Fields, “Efficient laser performance using a micro-optic based pump source,” in Advanced Solid-State Lasers, T. Y. Fan, B. Chai, eds., Vol. 20 of OSA Proceedings (Optical Society of America, Washington, D.C., 1994), pp. 276–279.

Goltsos, W. C.

J. R. Leger, W. C. Goltsos, “Geometrical transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).

Graf, Th.

Hemmati, H.

Hinkley, D. A.

T. S. Rose, J. S. Swenson, D. A. Hinkley, R. A. Fields, “Efficient laser performance using a micro-optic based pump source,” in Advanced Solid-State Lasers, T. Y. Fan, B. Chai, eds., Vol. 20 of OSA Proceedings (Optical Society of America, Washington, D.C., 1994), pp. 276–279.

Imai, H.

S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).

Kobayashi, T.

Larat, C.

Leger, J. R.

J. R. Leger, W. C. Goltsos, “Geometrical transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).

Lesh, J. R.

Pocholle, J. P.

Rae, C. F.

Rose, T. S.

T. S. Rose, J. S. Swenson, D. A. Hinkley, R. A. Fields, “Efficient laser performance using a micro-optic based pump source,” in Advanced Solid-State Lasers, T. Y. Fan, B. Chai, eds., Vol. 20 of OSA Proceedings (Optical Society of America, Washington, D.C., 1994), pp. 276–279.

Saito, Y.

Sakamoto, M.

M. Sakamoto, D. F. Welch, J. G. Endriz, D. R. Scifres, W. Streifer, “76 W cw monolithic laser diode arrays,” Appl. Phys. Lett. 54, 2299–2300 (1989).

Sanchez, A.

T. Y. Fan, A. Sanchez, “Pump source requirements for end-pumped lasers,” IEEE J. Quantum Electron. 26, 311–316 (1990).

T. Y. Fan, A. Sanchez, W. E. DeFeo, “Scalable, end-pumped, diode-laser-pumped laser,” Opt. Lett. 14, 1057–1059 (1989).

Schwarz, M.

Scifres, D. R.

M. Sakamoto, D. F. Welch, J. G. Endriz, D. R. Scifres, W. Streifer, “76 W cw monolithic laser diode arrays,” Appl. Phys. Lett. 54, 2299–2300 (1989).

Seamans, J. F.

S. C. Tidwell, J. F. Seamans, M. S. Bowers, “Highly efficient 60-W TEM00 cw diode-end-pumped Nd:YAG laser,” Opt. Lett. 18, 116–118 (1993).

S. C. Tidwell, J. F. Seamans, M. S. Bowers, A. K. Cousins, “Scaling cw diode-end-pumped Nd:YAG lasers to high average powers,” IEEE J. Quantum Electron. 28, 997–1009 (1992).

Shannon, D. C.

Sibbett, W.

Sinclair, B. D.

Streifer, W.

M. Sakamoto, D. F. Welch, J. G. Endriz, D. R. Scifres, W. Streifer, “76 W cw monolithic laser diode arrays,” Appl. Phys. Lett. 54, 2299–2300 (1989).

Swenson, J. S.

T. S. Rose, J. S. Swenson, D. A. Hinkley, R. A. Fields, “Efficient laser performance using a micro-optic based pump source,” in Advanced Solid-State Lasers, T. Y. Fan, B. Chai, eds., Vol. 20 of OSA Proceedings (Optical Society of America, Washington, D.C., 1994), pp. 276–279.

Terry, J. A. C.

Tidwell, S. C.

S. C. Tidwell, J. F. Seamans, M. S. Bowers, “Highly efficient 60-W TEM00 cw diode-end-pumped Nd:YAG laser,” Opt. Lett. 18, 116–118 (1993).

S. C. Tidwell, J. F. Seamans, M. S. Bowers, A. K. Cousins, “Scaling cw diode-end-pumped Nd:YAG lasers to high average powers,” IEEE J. Quantum Electron. 28, 997–1009 (1992).

Verdún, H. R.

Wallace, R. W.

Welch, D. F.

M. Sakamoto, D. F. Welch, J. G. Endriz, D. R. Scifres, W. Streifer, “76 W cw monolithic laser diode arrays,” Appl. Phys. Lett. 54, 2299–2300 (1989).

Yamaguchi, S.

S. Yamaguchi, T. Kobayashi, Y. Saito, K. Chiba, “Collimation of emissions from a high-power multistripe laser-diode bar with multiprism array coupling and focusing to a small spot,” Opt. Lett. 20, 898–900 (1995).

S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).

Zbinden, H.

Appl. Phys. Lett. (1)

M. Sakamoto, D. F. Welch, J. G. Endriz, D. R. Scifres, W. Streifer, “76 W cw monolithic laser diode arrays,” Appl. Phys. Lett. 54, 2299–2300 (1989).

IEEE J. Quantum Electron. (4)

S. Yamaguchi, H. Imai, “Efficient Nd:YAG laser end-pumped by a 1 cm aperture laser-diode bar with a GRIN lens array coupling,” IEEE J. Quantum Electron. 28, 1101–1105 (1992).

T. Y. Fan, A. Sanchez, “Pump source requirements for end-pumped lasers,” IEEE J. Quantum Electron. 26, 311–316 (1990).

S. C. Tidwell, J. F. Seamans, M. S. Bowers, A. K. Cousins, “Scaling cw diode-end-pumped Nd:YAG lasers to high average powers,” IEEE J. Quantum Electron. 28, 997–1009 (1992).

J. R. Leger, W. C. Goltsos, “Geometrical transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers,” IEEE J. Quantum Electron. 28, 1088–1100 (1992).

Opt. Lett. (10)

H. Zbinden, J. E. Balmer, “Q-switched Nd:YLF laser end pumped by a diode-laser bar,” Opt. Lett. 15, 1014–1016 (1990).

Th. Graf, J. E. Balmer, “High-power Nd:YLF laser end pumped by a diode-laser bar,” Opt. Lett. 18, 1317–1319 (1993).

H. Hemmati, J. R. Lesh, “3.5-W Q-switched 532-nm Nd:YAG laser pumped with fiber-coupled diode lasers,” Opt. Lett. 19, 1322–1324 (1994).

S. C. Tidwell, J. F. Seamans, M. S. Bowers, “Highly efficient 60-W TEM00 cw diode-end-pumped Nd:YAG laser,” Opt. Lett. 18, 116–118 (1993).

D. C. Shannon, R. W. Wallace, “High-power Nd:YAG laser end pumped by a cw, 10 mm × 1 μm aperture, 10-W laser-diode bar,” Opt. Lett. 16, 318–320 (1991).

C. F. Rae, J. A. C. Terry, B. D. Sinclair, M. H. Dunn, W. Sibbett, “Single-frequency, end-pumped Nd:YLF laser excited by a 12-mJ diode-laser array,” Opt. Lett. 17, 1673–1675 (1992).

H. R. Verdún, T. Chuang, “Efficient TEM00-mode operation of a Nd:YAG laser end pumped by a three-bar high-power diode-laser array,” Opt. Lett. 17, 1000–1002 (1992).

T. Y. Fan, A. Sanchez, W. E. DeFeo, “Scalable, end-pumped, diode-laser-pumped laser,” Opt. Lett. 14, 1057–1059 (1989).

G. Feugnet, C. Bussac, C. Larat, M. Schwarz, J. P. Pocholle, “High-efficiency TEM00 Nd:YVO4 laser longitudinally pumped by a high-power array,” Opt. Lett. 20, 157–159 (1995).

S. Yamaguchi, T. Kobayashi, Y. Saito, K. Chiba, “Collimation of emissions from a high-power multistripe laser-diode bar with multiprism array coupling and focusing to a small spot,” Opt. Lett. 20, 898–900 (1995).

Other (1)

T. S. Rose, J. S. Swenson, D. A. Hinkley, R. A. Fields, “Efficient laser performance using a micro-optic based pump source,” in Advanced Solid-State Lasers, T. Y. Fan, B. Chai, eds., Vol. 20 of OSA Proceedings (Optical Society of America, Washington, D.C., 1994), pp. 276–279.

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Figures (8)

Fig. 1.
Fig. 1.

Schematic of the laser-diode-bar end-pumped Nd:YAG laser. Twelve beams emitted from 12 stripes of the 1-cm aperture laser-diode bar, each with an aperture of 200 μm spaced 800 μm apart, are collimated by a multiprism array with a width of 1.12 cm, comprising 14 oblique prismlets. The resonant cavity is formed by the left-hand facet of the Nd:YAG and the output mirror. (a) plane parallel to the junction [horizontal (xy) plane]; (b) plane perpendicular to the junction [vertical (yz) plane]; d, distance between the laser-diode bar and the cylindrical microlens. HR, highly reflective; AR, antireflective.

Fig. 2.
Fig. 2.

Multiprism array and the transformation of beams emitted from a multistripe laser-diode array. The multiprism array and the laser-diode array consist of 14 prismlets and 12 stripes, respectively. The cylindrical microlens is not shown. The π1's are the faces upon which the beams are incident. The π2's are the faces from which the beams are projected. The σ1's, σ2's, and σ3's are the faces upon which the beams are totally reflected. p is the spacing of prismlets in centers. p = 0.8 mm.

Fig. 3.
Fig. 3.

Observed Nd:YAG cw output-power characteristics versus laser-diode-bar output power (open circles) for the laser-diode-bar end-pumped Nd:YAG laser.

Fig. 4.
Fig. 4.

Beam profiles of the laser-diode-bar end-pumped Nd:YAG laser observed at a position 80 mm from the output mirror: (a) plane parallel to the junction [horizontal component (x axis)], (b) plane perpendicular to the junction [vertical component (y axis)].

Fig. 5.
Fig. 5.

Ray-tracing plot for rays emitted from 12 stripes at angles of ±15° in the plane perpendicular to the junction (y axis) in the focusing area. The aspherical lens is located at the left end. Because of the transformation by the multiprism array, the rays drawn are in the plane parallel to the junction (x axis). (a) The cylindrical microlens in Fig. 1 is positioned so that all the rays are parallel between the cylindrical microlens and the aspherical lens. (b) 20-μm displacement of the cylindrical microlens toward the laser-diode bar. Note that the scale of the x-coordinate axis is twice as large as that of the z-coordinate axis.

Fig. 6.
Fig. 6.

Beam profiles of the pump beams at the waist: (a) plane parallel to the junction [horizontal component (x axis)], (b) plane perpendicular to the junction [vertical component (y axis)].

Fig. 7.
Fig. 7.

Q-switched pulse shape of the laser-diode-bar end-pumped Nd:YAG laser at a pulse-repetition frequency of 1 kHz. The pulse width is 25.2 ns (FWHM).

Fig. 8.
Fig. 8.

Repetition-frequency dependence of the average power and the pulse width (FWHM) of laser-diode-bar end-pumped Q-switched Nd:YAG laser. The cw level is 0.82 W.

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