Abstract

We have demonstrated what we believe to be the first mid-infrared optical parametric oscillator (OPO) pumped directly by a pulsed Tm-doped fiber laser. The Tm-fiber pump laser produces 30ns pulses with a repetition rate of 30kHz at a wavelength of 2μm. The ZnGeP2 (ZGP) OPO produces 20ns mid-IR pulses in the 3.43.9μm and 4.14.7μm spectral regions simultaneously. More than 658mW of mid-IR output power has been generated with a total OPO slope efficiency greater than 35%.

© 2008 Optical Society of America

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References

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Figures (5)

Fig. 1
Fig. 1

Schematic of Tm-fiber pump laser and OPO. SD, 1.55 μ m seed diode; ISO, isolator; PD, 980 nm pump diode; FBG, 2 μ m fiber Bragg grating; TDF, single-mode Tm-doped fiber; TDFA, 795 nm pumped Tm-doped fiber amplifier; FL, focusing lens; HWP, half-wave plate; IC, OPO input coupler; ZGP, Zn Ge P 2 crystal; OC, OPO output coupler.

Fig. 2
Fig. 2

TDFA output power versus 795 nm pump power ( 30 ns pulses at 30 kHz pulse repetition frequency). Inset, progression of pulse amplification in the TDFA.

Fig. 3
Fig. 3

Nondepleted 1.995 μ m pump pulse. (b) Mid-IR OPO pulse and depleted pump pulse. Spiking in the pulses are a result of mode beating in the oscillator.

Fig. 4
Fig. 4

OPO output power versus pump power. Lines represent linear fits to the measured data.

Fig. 5
Fig. 5

Measured beam quality from OPO: (a) signal beam quality, (b) idler beam quality. Data points represent measured data; curves represent fits to the data.

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