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 fiber laser design capable of generating shaped pulses with up to 1mJ pulse energy while keeping near diffraction limited beam quality. By controlling both the temporal and spectral characteristics of the seeder in a MOPA configuration we were able to achieve long pulses in the 100’s nanosecond range without the limiting effect of gain depletion and without reaching the detrimental SBS threshold. With this configuration we demonstrated 1mJ rectangular pulses which prove highly efficient for micromachining applications over equally energetic higher peak power gain saturated pulses.
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 demonstrate a record of over 20W yellow light by frequency-doubling the output of a novel Yb-doped fiber source. A pulsed source in the wavelength range of 1060-1100nm is efficiently shifted by SRS to the wavelength of a CW seed in the 1100-1180nm range. While pulse width is determined by the pulsed source, the wavelength is set by the narrowband CW seed. The extended frequency is doubled to yellow in a single pass SHG with an overall efficiency of 915nm pump converted to yellow exceeding 25%. The scheme can be used to generate scalable, high-power, costeffective sources in the 560-590nm range.
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.
We realize a novel scheme for emitting narrow linewidth laser pulses in the 1100-1200 nm wavelength range. A
narrowband CW laser at the desired wavelength is combined, together with a broadband pulsed laser at ~1080 nm, into a Large-Mode-Area Ytterbium fiber amplifier. The increase in peak intensity leads to efficient Raman conversion of
energy from the amplified 1080 nm pulses into the mode seeded by the CW laser. To demonstrate the concept, a
narroband CW diode at 1130 mm and a pulsed broadband laser at 1080 nm are combined to generate >15W pulses at 1130 nm with excellent beam quality and sub-100 pm linewidth, along with a demonstration of high efficiency nonlinear conversion into Yellow (565 nm).
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.