We have developed innovative high power polarized 1064nm pulsed fiber laser for efficient nonlinear frequency
conversion and by frequency doubling its output generated 30W of average power with 68% conversion efficiency at
532nm. This new 1064nm pulsed fiber laser operates at 1.8MHz repetition rate with 1.3ns pulse duration and close to
bandwidth-limited spectral linewidth. The developed laser delivers 46W average power at 1064nm in the linearly
polarized output beam with a polarization extinction ratio 20dB. This laser has a truly solid-state design required for
deployment into the industrial environment and can be used for nonlinear frequency conversion to generate high power
emission in the visible and UV parts of optical spectrum as well as for other applications. The overall 16% efficiency
demonstrated in generating 532nm is believed to be the highest wall plug efficiency achieved by any solid-state or fiber
lasers with visible output. We expect that over 20% total efficiency for the fiber laser with tens of watts output in the
green spectral range will be available.
In this work we represent a highly efficient (>20%) CW second harmonic generation in PPKTP and PPLN crystals. As a fundamental source we used a high power (>24W) single-frequency (<50kHz linewidth) linearly polarized CW Er:Yb fiber laser. This laser was used in a single pass schematic to achieve more than 5W average power SHG in 780nm. Single pass conversion efficiency of >20% for PPLN and >7% for PPKTP was demonstrated. We also demonstrate a possibility of single mode fiber delivery for this SHG source with excellent beam quality (M2 <1.1). Pump power dependency of conversion efficiency and other SHG characteristics for PPLN and PPKTP would be presented and compared.
We have developed all fiber format pulsed lasers with bandwidth-limited emission and over 12kW peak power for the 1064nm and 1550nm wavelength ranges. The master oscillator followed by power fiber amplifier configurations were employed with operational frequencies from 100kHz to over 2MHz range and 2ns pulse duration. The pulse duration remains the same for all repetition rates. The designs of the low NA core fibers deployed ensure stable single spatial mode emission with 12μm and 14μm mode field diameter (MFD) for 1064nm and 1550nm correspondingly. The output emission bandwidth was below 0.1nm and pulse-to-pulse energy stability better than 1% were measured for all operational frequencies and output powers. Single mode fiber design of the fiber amplifiers ensured diffraction-limited output beam quality with M2 less than 1.1. New lasers can be used for nonlinear frequency conversion to generate emission in the visible and UV parts of optical spectrum as well as in other applications.
For the first time, a >10W single-mode Tm-doped amplifier is demonstrated. The all fiber format is optimized for single frequency signals in the 1800 - 2020 nm band. Natural Tm 3+ gain bandwidth is shifted towards the 1800nm and 2000nm region by selecting the fiber composition and length. No SBS-related issues were observed at levels of >10W of output power while using a single-frequency seed source. A simple model allowing the prediction of amplifier gain is presented.
100W linear-polarized single-mode CW emission is demonstrated in an all-fiber format at 1566 nm. The Yb3+/Er3+ doped fiber laser has an extinction ratio >20 dB and M2<1.1. Using an Yb-Er doped multi-mode fiber, the laser provides > 13% overall electrical efficiency and less than 4 nm linewidth without the onset of Yb ions generation at wavelength range of 1060-1080 nm. There are no saturation effects due to pump or nonlinear phenomena. Parasitic lasing is suppressed with fiber laser cavity design and specialty filters.
Proceedings Volume Editor (2)
This will count as one of your downloads.
You will have access to both the presentation and article (if available).
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.