Abstract
We report on a picosecond, green-pumped, lithium triborate optical parametric oscillator with record-high output power. It was synchronously pumped by a frequency-doubled (530 nm), pulse-compressed (4.4 ps), high-repetition-rate (230 MHz), fiber-amplified gain-switched laser diode. For a pump power of 17 W, a maximum signal and idler power of 3.7 W and 1.8 W was obtained from the optical parametric oscillator. A signal pulse duration of ~3.2 ps was measured and wide tunability from 651 nm to 1040 nm for the signal and from 1081 nm to 2851 nm for the idler was achieved.
Highlights
There is a growing demand for tunable femto- or picosecond pulses in the visible and the near-IR spectral region
We report on a picosecond, green-pumped, lithium triborate optical parametric oscillator with record-high output power
For a pump power of 17 W, a maximum signal and idler power of 3.7 W and 1.8 W was obtained from the optical parametric oscillator
Summary
There is a growing demand for tunable femto- or picosecond pulses in the visible and the near-IR spectral region. Such sources are required for a number of applications, especially in the area of multi-photon microscopy due to advances in techniques such as second-harmonic generation [1, 2], stimulated Raman scattering (SRS) [3] and coherent anti-Stokes Raman scattering (CARS) [4, 5]. We demonstrate the first green-pumped picosecond LBO OPO using a frequencydoubled, pulse-compressed, Yb:fiber-amplified, gain-switched laser diode MOPA pump source with broadly tunable, high-power output well-suited to CARS and SRS microscopy applications with biological samples [3, 5]. We note that high repetition rates reaching into the GHz regime are preferred in some circumstances in order to avoid nonlinearly induced damage of such biological samples while maintaining a good signal-tonoise ratio [15, 16]
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