Abstract

We report the observation of thermal-induced optical guiding and bistability in a mid-IR cw, singly resonant optical parametric oscillator (SRO) at 3.2μm. The SRO employs a MgO:PPLN crystal as the gain medium and a 1-nm-linewidth Yb-fiber laser at 1.064μm as the pump source. As soon as the pump power reaches the thermal guiding threshold at 16.5W, the SRO shows a step increase in the parametric efficiency by a factor of 2.5. At 25 W pump power, the SRO generated 5.3 and 1.2W at 1.58 and 3.23μm, respectively, with single-longitudinal-mode performance for the 3.23μm radiation.

© 2008 Optical Society of America

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References

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2008 (1)

2006 (1)

A. Henderson and R. Stafford, Appl. Phys. B 85, 181 (2006).
[CrossRef]

2002 (2)

1998 (1)

S. Guha, Appl. Phys. B 66, 663 (1998).
[CrossRef]

1996 (1)

Alexander, J. I.

Biondini, G.

Bisson, S. E.

Bosenberg, W. R.

Byer, R. L.

Drobshoff, A.

Guha, S.

S. Guha, Appl. Phys. B 66, 663 (1998).
[CrossRef]

Halonen, L.

Harren, F. J. M.

Hekkert, S. T. L.

Henderson, A.

A. Henderson and R. Stafford, Appl. Phys. B 85, 181 (2006).
[CrossRef]

Herpen, M. M. J. W. van

Kath, W. L.

Moore, R. O.

Myers, L. E.

Peltola, J.

Persijn, S.

Stafford, R.

A. Henderson and R. Stafford, Appl. Phys. B 85, 181 (2006).
[CrossRef]

Vainio, M.

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Figures (4)

Fig. 1
Fig. 1

Measured output signal power versus the pump power of the SRO. The filled and open dots denote the measured signal power when the pump power was varied from 0 to 25 W and back to 0 W , respectively. The inset shows a shift in the signal wavelength for the two bistability states A and B at 15 W pump power.

Fig. 2
Fig. 2

Far-field profiles of the pump beam (a) at the low-power state without SRO in operation and (b) with SRO in operation, and (c) at the high-power state with SRO in operation.

Fig. 3
Fig. 3

Pump depletion versus the pump power and the number of times above the threshold. The labels A (filled dots) and B (open dots) denote the two bistability states. The pump depletion is clamped at 50%–60% when the pump power exceeds the thermal guiding threshold at 16.5 W . The inset shows spectral hole burning in the depleted pump, which explains the clamped pump depletion.

Fig. 4
Fig. 4

Signal and idler output power as a function of output coupling of the idler wave when the pump power was fixed at 25 W and the crystal temperature was varied from 95 ° C   to 83 ° C .

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