Abstract

We report the production of mode-locked pulses as short as 8 psec by synchronous pumping in a laser using defect-perturbed Tl-atom color centers whose emission band, peaking at 1.52 μm, has a decay time of 1.6 μsec. However, pulse-width dependence on pump power and cavity loss is distinctly different from that obtained with dye lasers. Maximum cw output powers were in excess of 1 W. Details of center production and laser construction are given.

© 1982 Optical Society of America

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References

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  1. W. Gellerman, F. Luty, C. R. Pollack, “Optical properties and stable broadly tunable cw laser operation of new FA-type centers in Tl+ doped alkali halides,” Opt. Commun. 39, 391 (1981).
    [CrossRef]
  2. E. Goovaerts, J. Andriessen, S. V. Nistor, D. Schoemaker, “Electron-spin-resonance study of Tl atom defects in KCl,” Phys. Rev. B 24, 29 (1981).
    [CrossRef]
  3. L. F. Mollenauer, N. D. Vieira, L. Szeto, “Defect-perturbed metal-atom centers in alkali halides: a new class of highly stable, laser-active color centers,” in Digest of the Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1981), paper FM2.
  4. C. J. Delbecq, A. K. Ghosh, P. H. Yuster, “2P1/2 → 2P3/2 transitions of Tl0 in alkali-halide crystals,” Phys. Rev. 154, 797 (1967).
    [CrossRef]
  5. We have repeatedly tested the laser, allowing the crystal to rest in the dark at room temperature for several days between tests. In the second test, laser power declined to about 60% of its initial value but remained approximately constant in subsequent tests extending over a period of two weeks. A somewhat similar behavior of center density was reported in Ref. 1. It is not yet known if shelf life extends significantly longer.
  6. L. F. Mollenauer, D. M. Bloom, “Color-center laser generates picosecond pulses and several watts cw over the 1.25–1.45-mm range,” Opt. Lett. 4, 247 (1979).
    [CrossRef] [PubMed]
  7. C. J. Delbecq, E. Hutchinson, P. H. Yuster, “Tl2+ center in KCl:TlCl,” J. Phys. Soc. Jpn. 36, 913 (1974).
    [CrossRef]

1981 (2)

W. Gellerman, F. Luty, C. R. Pollack, “Optical properties and stable broadly tunable cw laser operation of new FA-type centers in Tl+ doped alkali halides,” Opt. Commun. 39, 391 (1981).
[CrossRef]

E. Goovaerts, J. Andriessen, S. V. Nistor, D. Schoemaker, “Electron-spin-resonance study of Tl atom defects in KCl,” Phys. Rev. B 24, 29 (1981).
[CrossRef]

1979 (1)

1974 (1)

C. J. Delbecq, E. Hutchinson, P. H. Yuster, “Tl2+ center in KCl:TlCl,” J. Phys. Soc. Jpn. 36, 913 (1974).
[CrossRef]

1967 (1)

C. J. Delbecq, A. K. Ghosh, P. H. Yuster, “2P1/2 → 2P3/2 transitions of Tl0 in alkali-halide crystals,” Phys. Rev. 154, 797 (1967).
[CrossRef]

Andriessen, J.

E. Goovaerts, J. Andriessen, S. V. Nistor, D. Schoemaker, “Electron-spin-resonance study of Tl atom defects in KCl,” Phys. Rev. B 24, 29 (1981).
[CrossRef]

Bloom, D. M.

Delbecq, C. J.

C. J. Delbecq, E. Hutchinson, P. H. Yuster, “Tl2+ center in KCl:TlCl,” J. Phys. Soc. Jpn. 36, 913 (1974).
[CrossRef]

C. J. Delbecq, A. K. Ghosh, P. H. Yuster, “2P1/2 → 2P3/2 transitions of Tl0 in alkali-halide crystals,” Phys. Rev. 154, 797 (1967).
[CrossRef]

Gellerman, W.

W. Gellerman, F. Luty, C. R. Pollack, “Optical properties and stable broadly tunable cw laser operation of new FA-type centers in Tl+ doped alkali halides,” Opt. Commun. 39, 391 (1981).
[CrossRef]

Ghosh, A. K.

C. J. Delbecq, A. K. Ghosh, P. H. Yuster, “2P1/2 → 2P3/2 transitions of Tl0 in alkali-halide crystals,” Phys. Rev. 154, 797 (1967).
[CrossRef]

Goovaerts, E.

E. Goovaerts, J. Andriessen, S. V. Nistor, D. Schoemaker, “Electron-spin-resonance study of Tl atom defects in KCl,” Phys. Rev. B 24, 29 (1981).
[CrossRef]

Hutchinson, E.

C. J. Delbecq, E. Hutchinson, P. H. Yuster, “Tl2+ center in KCl:TlCl,” J. Phys. Soc. Jpn. 36, 913 (1974).
[CrossRef]

Luty, F.

W. Gellerman, F. Luty, C. R. Pollack, “Optical properties and stable broadly tunable cw laser operation of new FA-type centers in Tl+ doped alkali halides,” Opt. Commun. 39, 391 (1981).
[CrossRef]

Mollenauer, L. F.

L. F. Mollenauer, D. M. Bloom, “Color-center laser generates picosecond pulses and several watts cw over the 1.25–1.45-mm range,” Opt. Lett. 4, 247 (1979).
[CrossRef] [PubMed]

L. F. Mollenauer, N. D. Vieira, L. Szeto, “Defect-perturbed metal-atom centers in alkali halides: a new class of highly stable, laser-active color centers,” in Digest of the Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1981), paper FM2.

Nistor, S. V.

E. Goovaerts, J. Andriessen, S. V. Nistor, D. Schoemaker, “Electron-spin-resonance study of Tl atom defects in KCl,” Phys. Rev. B 24, 29 (1981).
[CrossRef]

Pollack, C. R.

W. Gellerman, F. Luty, C. R. Pollack, “Optical properties and stable broadly tunable cw laser operation of new FA-type centers in Tl+ doped alkali halides,” Opt. Commun. 39, 391 (1981).
[CrossRef]

Schoemaker, D.

E. Goovaerts, J. Andriessen, S. V. Nistor, D. Schoemaker, “Electron-spin-resonance study of Tl atom defects in KCl,” Phys. Rev. B 24, 29 (1981).
[CrossRef]

Szeto, L.

L. F. Mollenauer, N. D. Vieira, L. Szeto, “Defect-perturbed metal-atom centers in alkali halides: a new class of highly stable, laser-active color centers,” in Digest of the Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1981), paper FM2.

Vieira, N. D.

L. F. Mollenauer, N. D. Vieira, L. Szeto, “Defect-perturbed metal-atom centers in alkali halides: a new class of highly stable, laser-active color centers,” in Digest of the Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1981), paper FM2.

Yuster, P. H.

C. J. Delbecq, E. Hutchinson, P. H. Yuster, “Tl2+ center in KCl:TlCl,” J. Phys. Soc. Jpn. 36, 913 (1974).
[CrossRef]

C. J. Delbecq, A. K. Ghosh, P. H. Yuster, “2P1/2 → 2P3/2 transitions of Tl0 in alkali-halide crystals,” Phys. Rev. 154, 797 (1967).
[CrossRef]

J. Phys. Soc. Jpn. (1)

C. J. Delbecq, E. Hutchinson, P. H. Yuster, “Tl2+ center in KCl:TlCl,” J. Phys. Soc. Jpn. 36, 913 (1974).
[CrossRef]

Opt. Commun. (1)

W. Gellerman, F. Luty, C. R. Pollack, “Optical properties and stable broadly tunable cw laser operation of new FA-type centers in Tl+ doped alkali halides,” Opt. Commun. 39, 391 (1981).
[CrossRef]

Opt. Lett. (1)

Phys. Rev. (1)

C. J. Delbecq, A. K. Ghosh, P. H. Yuster, “2P1/2 → 2P3/2 transitions of Tl0 in alkali-halide crystals,” Phys. Rev. 154, 797 (1967).
[CrossRef]

Phys. Rev. B (1)

E. Goovaerts, J. Andriessen, S. V. Nistor, D. Schoemaker, “Electron-spin-resonance study of Tl atom defects in KCl,” Phys. Rev. B 24, 29 (1981).
[CrossRef]

Other (2)

L. F. Mollenauer, N. D. Vieira, L. Szeto, “Defect-perturbed metal-atom centers in alkali halides: a new class of highly stable, laser-active color centers,” in Digest of the Conference on Lasers and Electro-Optics (Optical Society of America, Washington, D.C., 1981), paper FM2.

We have repeatedly tested the laser, allowing the crystal to rest in the dark at room temperature for several days between tests. In the second test, laser power declined to about 60% of its initial value but remained approximately constant in subsequent tests extending over a period of two weeks. A somewhat similar behavior of center density was reported in Ref. 1. It is not yet known if shelf life extends significantly longer.

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Figures (5)

Fig. 1
Fig. 1

Schematic of the laser. The crystal is mounted on a cold finger at 77 K. See text.

Fig. 2
Fig. 2

Peak of chopped cw output power as a function of wavelength. T refers to the measured output mirror transmission at band center. Pump power at input is 6 W (peak).

Fig. 3
Fig. 3

Mode-locked pulse widths (full width at half-maximum) as a function of pump power and output mirror transmission. See text

Fig. 4
Fig. 4

Autocorrelation trace of the narrowest pulses produced by the mode-locked Tl0(1) laser. Note the rounded top (complete lack of coherence spike). The pulses have no excess bandwidth (ΔtΔf = 0.3).

Fig. 5
Fig. 5

Gain evolution in the mode-locked Tl0(1) laser. (a) Pump pulse, ~80 psec wide. (b) and (c) Dashed curve, effect of pump pulse alone; solid curve, net gain change, including effect of laser pulse. The loss line is based on T = 12% for the output mirror and on an additional 6% intracavity loss. See text.

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