Abstract

We built a 32-laser-diode-formed virtual point source pumping system and achieved different pump light distributions from central intense to central uniform and central depressed. Continuous wave TEM00 operations of a Nd:YAG laser were performed under these pump light distributions and their thermal lensing effects were estimated. Results show that the operation under central depressed pump light distribution has the lowest thermal lensing effect and can provide the highest output power, which agrees with the results derived from the theoretical calculation with the heat conduction equation.

© 1997 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer-Verlag, Berlin, 1996), Chap. 6.
    [Crossref]
  2. D. Golla, M. Bode, S. Knoke, W. Schöne, A. Tünnermann, “62-W cw TEM00 Nd:YAG laser side-pumped by fiber-coupled diode lasers,” Opt. Lett. 21, 210–212 (1996).
    [Crossref] [PubMed]
  3. I. Freitag, D. Golla, S. Knoke, W. Schöne, H. Zellmer, A. Tünnermann, H. Welling, “Amplitude and frequency stability of a diode-pumped Nd:YAG laser operating at a single-frequency continuous-wave output power of 20 W,” Opt. Lett. 20, 462–464 (1995).
    [Crossref] [PubMed]
  4. N. Uehara, K. Nakahara, K. Ueda, “Continuous-wave TEM00-mode 26.5-W-output virtual-point-source diode-array-pumped Nd:YAG laser,” Opt. Lett. 20, 1707–1709 (1995).
    [Crossref]
  5. T. Brand, “Compact 170-W continuous-wave diode-pumped Nd:YAG rod laser with a cusp-shaped reflector,” Opt. Lett. 20, 1776–1778 (1995).
    [Crossref] [PubMed]
  6. W. Koechner, “Thermal lensing in a Nd:YAG laser rod,” Appl. Opt. 9, 2548–2553 (1970).
    [Crossref] [PubMed]
  7. A. Yariv, Quantum Electronics, 3rd ed. (Wiley, New York, 1989), Chap. 7.
  8. J. Song, A. P. Liu, K. Okino, K. Ueda, “Virtual point source pumped cw Nd:YAG laser with 81 W output from linear cavity and 22 W output from ring cavity,” Jpn. J. Appl. Phys. 35, L1268–L1270 (1996).
    [Crossref]
  9. W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer-Verlag, Berlin, 1996), Chap. 7.
    [Crossref]

1996 (2)

D. Golla, M. Bode, S. Knoke, W. Schöne, A. Tünnermann, “62-W cw TEM00 Nd:YAG laser side-pumped by fiber-coupled diode lasers,” Opt. Lett. 21, 210–212 (1996).
[Crossref] [PubMed]

J. Song, A. P. Liu, K. Okino, K. Ueda, “Virtual point source pumped cw Nd:YAG laser with 81 W output from linear cavity and 22 W output from ring cavity,” Jpn. J. Appl. Phys. 35, L1268–L1270 (1996).
[Crossref]

1995 (3)

1970 (1)

Bode, M.

Brand, T.

Freitag, I.

Golla, D.

Knoke, S.

Koechner, W.

W. Koechner, “Thermal lensing in a Nd:YAG laser rod,” Appl. Opt. 9, 2548–2553 (1970).
[Crossref] [PubMed]

W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer-Verlag, Berlin, 1996), Chap. 6.
[Crossref]

W. Koechner, Solid-State Laser Engineering, 4th ed. (Springer-Verlag, Berlin, 1996), Chap. 7.
[Crossref]

Liu, A. P.

J. Song, A. P. Liu, K. Okino, K. Ueda, “Virtual point source pumped cw Nd:YAG laser with 81 W output from linear cavity and 22 W output from ring cavity,” Jpn. J. Appl. Phys. 35, L1268–L1270 (1996).
[Crossref]

Nakahara, K.

Okino, K.

J. Song, A. P. Liu, K. Okino, K. Ueda, “Virtual point source pumped cw Nd:YAG laser with 81 W output from linear cavity and 22 W output from ring cavity,” Jpn. J. Appl. Phys. 35, L1268–L1270 (1996).
[Crossref]

Schöne, W.

Song, J.

J. Song, A. P. Liu, K. Okino, K. Ueda, “Virtual point source pumped cw Nd:YAG laser with 81 W output from linear cavity and 22 W output from ring cavity,” Jpn. J. Appl. Phys. 35, L1268–L1270 (1996).
[Crossref]

Tünnermann, A.

Ueda, K.

J. Song, A. P. Liu, K. Okino, K. Ueda, “Virtual point source pumped cw Nd:YAG laser with 81 W output from linear cavity and 22 W output from ring cavity,” Jpn. J. Appl. Phys. 35, L1268–L1270 (1996).
[Crossref]

N. Uehara, K. Nakahara, K. Ueda, “Continuous-wave TEM00-mode 26.5-W-output virtual-point-source diode-array-pumped Nd:YAG laser,” Opt. Lett. 20, 1707–1709 (1995).
[Crossref]

Uehara, N.

Welling, H.

Yariv, A.

A. Yariv, Quantum Electronics, 3rd ed. (Wiley, New York, 1989), Chap. 7.

Zellmer, H.

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (6)

Fig. 1
Fig. 1

Schematic diagram of the virtual point source (VPS) pumping system. The change in pump light distribution is illustrated in the lower part and was achieved by rotating the spherical mirror along its θ axis.

Fig. 2
Fig. 2

Pump light distributions obtained from ray-tracing calculations of different distributions: (a) central intense, (b) central uniform, (c) and (d) central depressed.

Fig. 3
Fig. 3

Cross-sectional profiles of the pump light distribution obtained from ray-tracing calculations of the different pump light distributions shown in Fig. 2.

Fig. 4
Fig. 4

Input and output characteristics of different pump light distributions under TEM00 operation.

Fig. 5
Fig. 5

Cross-sectional profile of the central uniform pump light distribution (scatter dots) and the fitting line (solid curve) that was obtained by using a polynomial sum of radius r (N = 3).

Fig. 6
Fig. 6

Temperature distribution of a YAG rod along the radius direction under 400-W input power. The scatter dots represent the results that were obtained with the finite-element method and the solid curve represents the fitting line that was obtained with T (r) = T0 + T2 r2.

Tables (1)

Tables Icon

Table 1 Comparison of the Output Characteristics and the Thermal Lensing Effects under Different Pump Light Distributions

Equations (10)

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

fT=1ATPin,
nr=n0+ΔnrT,
nr=n01-2r2b2,
fb24n0L,
Tr=T0+T2r2,
nr=n0+T2r2dndT.
fT=-12LT2dn/dT.
2r2+1rr+2z2Tr, z+Qr, zk=0,
Qr=ηPinπrrod2Lρr,
ρr=1Cn=0Ncnrn,

Metrics