We demonstrate a fiber laser that generates bursts of 70-300 pulses at a frequency of 2-8 MHz with over 4 mJ of energy per burst at a wavelength of 532 nm. The output of an Yb-doped fiber amplifier chain is doubled in a single pass through an LBO crystal with efficiency of above 65%. A seed-diode generates the pulse train, which is amplified to a peak power that allows efficient SHG. Such a solution may have many industrial and other applications, where fiber-based solutions have many advantages, but suffer a disadvantage of relatively low pulse energy.
We demonstrate a pulsed green fiber laser using highly efficient frequency conversion in a robust single-pass configuration of a narrow Linewidth source based on specialty LMA fibers for enabling high pulse energies and peak power. The ability to reach short pulses that are selectable from 1 to 20ns, peak powers up to 20kW, and pulse energies up to 200 μJ in the 532nm wavelength regime, while maintaining excellent beam quality with high repetition rate capabilities, enables new opportunities for next-generation material processing applications. We have demonstrated a variety of processes with high throughput and quality, including glass cutting, wafer cutting, PCB cutting, and ceramic scribing.
We report on the development of highly stable pulsed and CW green, yellow and UV fiber based lasers. Using narrow linewidth sources and specialty fibers for high peak powers we achieve highly efficient frequency conversion in a robust single-pass configuration with >70% optical conversion to green and >20% to UV. By employing a novel wavelength extension of Yb-doped fibers we span the wavelength range of green to yellow with >35% conversion efficiency and over 25W average power.
Lasers and laser systems are a mature technology, yet there is a long road ahead for innovation and enthusiasm. We review some of the 40 years of R&D and manufacturing of lasers at ELOP-Elbit Systems. Bulk solid state lasers, for designators and range finders, as well as fiber lasers, for directed IR countermeasures and laser radar applications are described. These two technologies provide and will continue to offer a vast number of products for security and defense applications. Current and future generations of laser products will have higher average power together with improved beam quality, better efficiencies, and superior robustness all in a more compact package.
The ability to perform optical sectioning is one of the great
advantages of laser-scanning microscopy. This introduces, however,
a number of difficulties due to the scanning process, such as
lower frame rates due to the serial acquisition process. Here we
show that by introducing spatiotemporal pulse shaping techniques
to multiphoton microscopy it is possible to obtain full-frame
depth resolved imaging completely without scanning. Our method
relies on temporal focusing of the illumination pulse. The pulsed
excitation field is compressed as it propagates through the
sample, reaching its shortest duration at the focal plane, before
stretching again beyond it. Combining temporal focusing with
line-scanning microscopy results in an enhanced depth resolution,
equivalent to that achieved by point scanning. Both the
scanningless and the line-scanning techniques are applied to
obtain depth-resolved two-photon excitation fluorescence (TPEF)
images of drosophila egg-chambers.
We present a brief overview of a promising switching technology based on Silica on Silicon thermo-optic integrated circuits. This is basically a 2D solid-state optical device capable of non-blocking switching operation. Except of its excellent performance (insertion loss<5dB, switching time<2ms...), the switch enables additional important build-in functionalities. It enables single-to- single channel switching and single-to-multiple channel multicasting/broadcasting. In addition, it has the capability of channel weighting and variable output power control (attenuation), for instance, to equalize signal levels and compensate for unbalanced different optical input powers, or to equalize unbalanced EDFA gain curve. We examine the market segments appropriate for the switch size and technology, followed by a discussion of the basic features of the technology. The discussion is focused on important requirements from the switch and the technology (e.g., insertion loss, power consumption, channel isolation, extinction ratio, switching time, and heat dissipation). The mechanical design is also considered. It must take into account integration of optical fiber, optical planar wafer, analog electronics and digital microprocessor controls, embedded software, and heating power dissipation. The Lynx Photon.8x8 switch is compared to competing technologies, in terms of typical market performance requirements.