A 9.5-W 82-MHz-repetition-rate picosecond optical parametric generator with cw diode laser injection seeding
| Autor: | U. Bäder, R. Wallenstein, Jan-Peter Meyn, B. Köhler, A. Nebel |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Quasi-phase-matching
Materials science Physics and Astronomy (miscellaneous) business.industry Lithium niobate Energy conversion efficiency General Engineering General Physics and Astronomy Pulse duration Laser pumping Laser law.invention chemistry.chemical_compound chemistry law Picosecond Optoelectronics business Diode |
| Zdroj: | Applied Physics B. 75:31-34 |
| ISSN: | 1432-0649 0946-2171 |
| DOI: | 10.1007/s00340-002-0942-4 |
| Popis: | We report on an injection-seeded 9.5-W 82-MHz-repetition-rate picosecond optical parametric generator (OPG) based on a 55 mm long crystal of periodically poled lithium niobate (PPLN) with a quasi-phase-matching (QPM) grating period of 29.75 μm. The OPG is excited by a continuously diode pumped mode-locked picosecond Nd:YVO4 oscillator-amplifier system. The laser system generates 7 ps pulses with a repetition rate of 82.3 MHz and an average power of 24 W. Without injection-seeding the total average output power of the OPG is 8.9 W, which corresponds to an internal conversion efficiency of 50%. The wavelengths of the signal and idler waves were tuned in the range 1.57–1.64 μm and 3.03–3.3 μm, respectively, by changing the crystal temperature from 150 °C to 250 °C. Injection seeding of the OPG at 1.58 μm with 4 mW of single frequency continuous-wave radiation of a distributed-feedback (DFB) diode laser increases the OPG output to 9.5 W (53% conversion efficiency). The injection seeding increases the pulse duration and reduces the spectral bandwidth. When pumped by 10 W of 1.06 μm laser radiation, the duration of the signal pulses increased from 3.6 ps to 5.5 ps while the spectral bandwidth is reduced from 4.5 nm to 0.85 nm. Seeding thus improved the time-bandwidth product from 1.98 to a value of 0.56, much closer to the Fourier limit. |
| Databáze: | OpenAIRE |
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