Abstract

A microchip-laser-pumped optical parametric amplifier produces 35-μJ, 1.537-μm pulses of 190-ps duration at 8  kHz, in a near-diffraction-limited output beam with a Fourier-transform-limited spectrum. The flight-ready laser head is pumped by 20 W of optical power from two fiber-coupled laser-diode arrays, occupies a volume of 0.14 liters, and has a mass of 0.34  kg.

© 2007 Optical Society of America

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References

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2004 (1)

2003 (1)

J. J. Zayhowski and A. L. Wilson, Jr., "Pump-induced bleaching of the saturable absorber in short-pulse Nd:YAG/Cr4+:YAG passively Q-switched microchip lasers," IEEE J. Quantum Electron. 39, 1588-1593 (2003).
[CrossRef]

2002 (2)

1996 (1)

1994 (1)

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Figures (15)

Fig. 1
Fig. 1

Miniature, 190-ps, eye-safe source for three-dimensional imaging.

Fig. 2
Fig. 2

Optical path superimposed on assembly drawing of laser system.

Fig. 3
Fig. 3

1.064-μm pulse energy versus peak current to laser-diode array pumping double-pass amplifier.

Fig. 4
Fig. 4

Oscilloscope trace of amplifier output with 1-s persistence. The measured pulse width (FWHM) of the output is 190 ps; the bandwidth of the oscilloscope is 7 GHz.

Fig. 5
Fig. 5

1.537-μm OPA output versus 1.064-μm pump energy.

Fig. 6
Fig. 6

Pulse width of OPA output versus 1.064-μm pump energy, measured with a 7-GHz oscilloscope.

Fig. 7
Fig. 7

1.537-μm OPA output versus seed power for 148 μJ of pump energy.

Fig. 8
Fig. 8

Pulse width of OPA output versus seed power for 148 μJ of pump energy.

Fig. 9
Fig. 9

Oscilloscope trace of OPA output with 1-s persistence. The measured pulse width (FWHM) of the output is 190 ps; the bandwidth of the oscilloscope is 7 GHz.

Fig. 10
Fig. 10

Relative output energy of OPA versus time.

Fig. 11
Fig. 11

Intensity image and profiles at beam waist.

Fig. 12
Fig. 12

Far-field intensity image and profiles.

Fig. 13
Fig. 13

Spectrum of unseeded OPA with pump energy of 148 μJ. The resolution of the spectrum analyzer is 5 pm.

Fig. 14
Fig. 14

Spectrum of OPA seeded with 1.65 mW, with pump energy of 148 μJ. The resolution of the spectrum analyzer is 5 pm.

Fig. 15
Fig. 15

Pulse energy and spectral width of OPA output versus output wavelength.

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