47 research outputs found
A compact, multi-pixel parametric light source
The features of a compact, single pass, multi-pixel optical parametric
generator are discussed. Several hundreds of independent high spatial-quality
tunable ultrashort pulses were produced by pumping a bulk lithium triborate
crystal with an array of tightly focussed intense beams. The array of beams was
produced by shining a microlenses array with a large pump beam. Overall
conversion efficiency to signal and idler up to 30% of the pump beam has been
reported. Shot-to-shot energy fluctuation down to 3% was achieved for the
generated radiation.Comment: 11 pages, 6 figures, submitted to "Optics Communications
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Polarization and dispersion properties of elliptical hole golden spiral photonic crystal fiber
An elliptical air-hole golden spiral photonic crystal fiber (EGS-PCF) is analyzed with the full-vectorial finite element method. The air-holes in the EGS-PCF are arranged in a spiral pattern governed by the Golden Ratio, where the design has been inspired by the optimal arrangement of seeds found in nature. The EGS-PCF exhibits extremely high birefringence (âŒ0.022 at operating wavelength 1550 nm) which is particularly useful for generating a polarization stable supercontinuum (SC). The fiber can also be designed to have a Zero Dispersion Wavelength (ZDW) at a suitable wavelength for only one polarization and large negative dispersion for the other, leading to a single-polarization SC. In addition, the fiber dispersion can be designed to obtain ZDWs at 800 nm and 1064 nm simultaneously, which can facilitate broadband supercontinuum generation (SCG) through multi-wavelength pumping
Picosecond laser source at 1 MHz with continuous tunability in the visible red band
We report the first demonstration to our knowledge of a continuously tunable
picosecond laser operating around 1 MHz. The emission can be tuned from 640 to
685 nm and the repetition rate from 200 kHz to 1 MHz with a pulse duration of
less than 200 ps. The system is based on a Nd:YVO4 passively Q-switched
microchip laser providing a few tens of nJ per pulse. Two cascaded stages of
amplification are then used to increase the pulse energy to several microJ .
The frequency doubled radiation is then used to pump a
periodically-poled-niobate-lithium (PPLN)-based optical parametric generator in
an all-solid-state architecture. 20 nJ of tunable signal radiation are
obtained. We also demonstrated 300-ps pulses generation in the UV (355 nm) at 1
MHz