We report a high power tunable femtosecond soliton-based source using a simple combination of fiber-amplified pulses at 1064 nm and hollow-core photonic bandgap fiber. Compression of 5.5 ps input pulses, strongly chirped by self phase modulation in the amplifier, results in stable 520 fs-soliton formation with 77% conversion efficiency after only 8m propagation in the hollow-core fiber. The Raman self-frequency shift of the solitons was used to provide 33 nm wavelength tuneability. The transform-limited output pulses were frequency doubled using a nonlinear crystal with high conversion efficiency of 60% to demonstrate a femtosecond green laser tunable from 534 nm to 548 nm with 180 nJ pulse energy.
Lasers are increasingly important components within biological imaging and analysis systems. Applications range from flow cytometry to confocal and multi‐photon microscopy. However, many commercial imaging systems are still limited in performance by the availability of suitable laser sources‐limited in the availability of wavelengths and in the size, cost, power and reliability of conventional laser technologies. Ultrafast fibre lasers offer turnkey, compact and reliable solutions for next generation biomedical imaging systems.
Lasers continue to be increasingly important components within biological imaging and analysis systemsfrom Argon-Ion and HeNe lasers used within flow cytometry and confocal microscopy, to femtosecond Ti: Sapphire and DPSS femtosecond sources in multi-photon microscopy. However, many commercial imaging systems are still limited in performance by the availability of suitable laser sources -both in the limited availability of wavelengths and in the size, cost and reliability of conventional laser technologies. Ultrafast fibre lasers offer turnkey, compact and reliable solutions for next generation biomedical imaging systems. Here we introduce the basic concept of the ultrafast fibre laser and describe some of the applications and benefits of this technology within biophotonics research and imaging systems.
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