Abstract

We report on a diode-pumped master-oscillator/fiber-amplifier (MOFA) system consisting of a passively Q-switched, single-frequency Nd:LSB microchip laser that seeds a dual-stage Yb-doped fiber amplifier. A large-core, single-mode photonic crystal fiber was used for the final amplifier. The MOFA generated 1062nm wavelength, 1-ns long, ~10kHz repetition-rate, diffraction-limited pulses of energy >1mJ, peak power >1MW, average power >10W, and spectral linewidth ~9 GHz.

© 2005 Optical Society of America

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References

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  1. G. P. Agrawal, Nonlinear Fiber Optics, Third Edition (Academic, San Diego, Calif., 2001).
  2. F. Di Teodoro and C. D. Brooks, �??1.1-MW peak-power, 7-W average-power, high-spectral-brightness, diffraction-limited pulses from a photonic crystal fiber amplifier,�?? Opt. Lett., in press.
    [PubMed]
  3. A. E. Siegman, Lasers (University Science Books, Sausalito, Calif., 1986). See Ch. 10.2, pp. 384-386.
  4. W. Torruellas, Y. Chen, B. McIntosh, J. Chen, J, Farroni, K. Tankala, S. Webster, D. Hagan, and M. J. Soileau, �??High peak power Ytterbium doped fiber amplifiers,�?? Tech. Digest Solid State and Diode Laser Technology Review (SSDLTR), Los Angeles, USA, June 7-9, 2005, Fiber-7.
  5. M.-Y. Cheng, Y.-C. Chang, A. Galvanauskas, P. Mamidipudi, R. Changkakoti, and P. Gatchell, �??High-energy and high-peak-power nanosecond pulse generation with beam quality control in 200- µm core highly multimode Yb-doped fiber amplifiers,�?? Opt. Lett. 30, 358 (2005).
    [CrossRef] [PubMed]

Opt. Lett. (2)

SSDLTR 2005 (1)

W. Torruellas, Y. Chen, B. McIntosh, J. Chen, J, Farroni, K. Tankala, S. Webster, D. Hagan, and M. J. Soileau, �??High peak power Ytterbium doped fiber amplifiers,�?? Tech. Digest Solid State and Diode Laser Technology Review (SSDLTR), Los Angeles, USA, June 7-9, 2005, Fiber-7.

Other (2)

G. P. Agrawal, Nonlinear Fiber Optics, Third Edition (Academic, San Diego, Calif., 2001).

A. E. Siegman, Lasers (University Science Books, Sausalito, Calif., 1986). See Ch. 10.2, pp. 384-386.

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Figures (4)

Fig. 1.
Fig. 1.

Architecture of master-oscillator/fiber-amplifier system. MO: Master oscillator; OI: Optical isolator; L: Lens; YDF: Yb-doped fiber; LPF: Dichroic long-pass filter (~98% transmission at 1062, ~98% reflection at 976nm); BPF: Optical band-pass filter (600pm bandwidth, >50dB out-of-band rejection); PCF: Yb-doped photonic-crystal fiber.

Fig. 2.
Fig. 2.

PCF-amplifier pulse energy and average power vs. launched pump power. Dashed line: Linear fit. Inset: Pulse temporal profile at 1.05mJ pulse energy.

Fig. 3.
Fig. 3.

Solid triangles and hollow circles: Beam radius measured along perpendicular directions (Rx and Ry, respectively) as a function of distance z from waist location. Solid lines: Fit to the expression Rx,y = w{1+[M2λz/(πw2)]2}0.5, where λ is the wavelength and w is the radius of the beam at waist.

Fig. 4.
Fig. 4.

Peak-normalized spectrum of PCF amplifier output at 1.05mJ pulse energy. Inset: High-resolution scan of the signal spectrum vs. frequency shift from the peak.

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