Is there any nonlinear process through which a 0.8 micron femtosecond laser pulse can be used to efficiently produce radiations in the range of 1 - 1.5 microns.
check out:
Marandi, Alireza; Leindecker, Nick C.; Pervak, Vladimir; Byer, Robert L.; Vodopyanov, Konstantin L. (2012-03-26). "Coherence properties of a broadband femtosecond mid-IR optical parametric oscillator operating at degeneracy" (PDF). Optics Express. 20 (7): 7255. Bibcode:2012OExpr..20.7255M. doi:10.1364/oe.20.007255. ISSN 1094-4087.
you can use nonlinear optical mechanisms, PPLN structures, OPO (optical parametric oscillators), mixing with other wavelengths for differential wave generation, or other down conversion techniques.
Yes, supercontinuum generation and nonlinear wavelength conversion with nonlinear photonic crystal fibers. PM supercontinuum fiber for 800-nm-range pumping, would this be what you look for?
Thank You all for your valuable inputs. OPO seems to be the way to go as it is tunable while nonlinear photonic crystal fibers based super continuum generation in the desired range has the limitation on input laser pulse energy.
you can shift it by stimulated Raman effect in a fiber, using FBG to make a cavity. The other option is to use supercontinuum generation in a photonic crystal fiber, and filtering out the desired frequency (have a look at J. Licea-Rodríguez et al, ‘Femtosecond pulse source based on soliton filtering from a supercontinuum generated in a microstructured fiber’, Revista Mexicana de Física 56, 311-316 (2010).)
It depends on the application and conversion efficiency you are expecting. While OPOs are mostly at nJ pulses with high pump to signal/Idler conversion efficiency. But if you have mJ pulse, you can go with Parametric generation like in most OPAs. In Supercontinuum based on PCF, you will not have much control over the output bandwidth and tuning cannot be independent and arbitrary.
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