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

2003

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

1996

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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.

Equations (82)

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35 - μ J
1.537 - μ m
8   kHz
0.34   kg
35 - μ J
1.537 - μ m
8 - kHz
1.65   mW
0.34   kg
1.064- μ m
1.537 - μ m
808 - nm
200 - μ m
1.064 - μ m
4.5   mm
0.25 - mm
1 - mm
1 - mm
Cr 4+ :YAG
6 cm 1
1.064 μ m
50 μ s
8 - kHz
< 1 μ s
7 - GHz
6   ps
5 - mm
Nd:YVO 4
Nd:YVO 4
1.064 - μ m
808 - nm
1.064 - μ m
47 μ J
5 - mm
1.064 - μ m
15 - mm
30 - mm
14.75 - mm
0.25 - mm
30 μ s
150 μ J
2 %
1.064 - μ m
1.537 - μ m
400 - μ m
1.064 - μ m
2 - cm
7 - mm
0.5   mm
1.537 - μ m
1.064 - μ m
808 - nm
1.537 μ m
1.537 - μ m
1.65   mW
148 - μ J
40   mW
4 %
3 %
1 %
7.5   cm
160 μ m
9   cm
238 μ m
1.6   times
0.5   nm
1.65 - mW
1.5367 - μ m
38  pm
2   nm
12.7   cm × 4.0   cm × 2.5   cm
40 ° C
41 ° C
< 4 %
1.537 - μ m
8 - kHz
35 - μ J
1.537 μ m
190   ps
38   pm
20   W
0.34   kg

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