Abstract
We have demonstrated an ultrashort, compact green light radiation by frequency doubling of an all-fiber ytterbium-doped fiber laser source in a PPKTP waveguide fabricated by femtosecond laser pulses. Using the fabricated PPKTP waveguide crystal containing a 10 mm single grating with a period of 9.0 μm, we generate 310 mW of picosecond radiation at 532 nm for a fundamental power of 1.6W, corresponding to a conversion efficiency of 19.3%. The temperature tuning range of 8°C is achieved for a fixed fundamental wavelength of 1064 nm, the FWHM of the wavelength tuning curve is 4.2 nm at room temperature. The generated ultrashort pulses at 532 nm are of great importance and have comprehensive applications in photobiology research and high-resolution spectroscopy.
Highlights
The recent progress in photobiology research, such as microscopy, optical micromanipulation and bio-medical imaging continues to justify the need for compact, low-cost visible and nearinfrared lasers that demonstrate true portability and practicality
To characterize the second harmonic generation (SHG) properties in PPKTP waveguide, we first investigated the effect of crystal temperature on the SHG power
Taking into account the group velocity mismatch (GVM), group velocity dispersion (GVD) and the cubic nonlinear effects, we studied the SHG process of 90ps pulses based on the model described by Eq (1) in [30]
Summary
The recent progress in photobiology research, such as microscopy, optical micromanipulation and bio-medical imaging continues to justify the need for compact, low-cost visible and nearinfrared lasers that demonstrate true portability and practicality. Laser sources at the shorter green and blue wavelengths provide clear advantages over infrared lasers in allowing for stronger beam focusing and enhanced resolution in multi-dimensional imaging techniques [1]. Efficient green and blue light generation by quasi-phase-matched (QPM) frequency doubling of diode laser [5] and picosecond (ps) pulses from mode-locked solid state lasers have been reported [6,7]. The choice of the traditional solid-state or diode laser sources limit the range of accessible wavelength and the device compactness. Fiber lasers has the advantages of high efficiency, excellent beam quality, efficient diode-pumped operation, very good heat dissipation, broad gain bandwidth, compactness and the potential of all-fiber integrity [8,9,10]. Fiber laser sources are becoming ideal pump sources of frequency doubling towards the new range, environmentally stable, and fiber-integrated radiation
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