Abstract

We report a flexible technique for threshold reduction and output power enhancement in synchronously pumped optical parametric oscillators (SPOPOs) based on synchronized retroreflection of the undepleted pump using a collimating system and a delay line, which allows easy and independent adjustment of the spatial and temporal overlap of the retroreflected beam in the nonlinear crystal. The method permits initial synchronization of the forward and retroreflected pump by interferometry, providing threshold reduction before oscillation is initiated. We demonstrate the technique in a femtosecond SPOPO based on BiB3O6, where a threshold reduction of 22% and an output power enhancement of 70% are achieved compared with single-pass pumping, with no detrimental effect on the spectral and temporal characteristics of the output pulses.

© 2012 Optical Society of America

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References

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2006

1994

T. J. Driscoll, G. M. Gale, and F. Hache, Opt. Commun. 110, 638 (1994).
[CrossRef]

1993

1990

Driscoll, T. J.

T. J. Driscoll, G. M. Gale, and F. Hache, Opt. Commun. 110, 638 (1994).
[CrossRef]

Ebrahim-Zadeh, M.

Esteban-Martin, A.

Fayaz, G. R.

Gale, G. M.

T. J. Driscoll, G. M. Gale, and F. Hache, Opt. Commun. 110, 638 (1994).
[CrossRef]

Ghotbi, M.

Graener, H.

Hache, F.

T. J. Driscoll, G. M. Gale, and F. Hache, Opt. Commun. 110, 638 (1994).
[CrossRef]

Kokabee, O.

Laenen, R.

Laubereau, A.

Moutzouris, K.

Petrov, V.

Powers, P. E.

Ramaiah-Badarla, V.

Ramakrishna, S.

Samanta, G. K.

Sun, Z.

Tang, C. L.

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Figures (5)

Fig. 1.
Fig. 1.

Schematic of the synchronized retroreflection-pumped femtosecond SPOPO based on BIBO.

Fig. 2.
Fig. 2.

(a) Equivalent interferometer of Fig. 1 for interference between consecutive pump pulses (N1 and N) from a laser with a repetition rate RR. (b) Interference beat signal between the retroreflected and main pump beam without and with synchronization, achieved by adjusting the delay line (ΔLp).

Fig. 3.
Fig. 3.

(a) Average signal power extracted from the SPOPO depending on the retroreflected delay line detuning. (b) SPOPO signal power using single pump and retroreflected pump versus input pump power. (c) SPOPO signal power using single pump and retroreflected pump across the signal tuning range.

Fig. 4.
Fig. 4.

Output signal spectrum (a) without and (b) with retroreflected pump. Autocorrelation profiles of signal pulses (c) without and (d) with retroreflected pump.

Fig. 5.
Fig. 5.

(a) Output signal pulse train and (b) RF spectra of the femtosecond SPOPO at 76 MHz repetition rate.

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