We report a low-cost hybrid Yb-fiber and three-stage Yb:YAG thin-rod MOPA laser pumped by high-brightness LDs, which delivers 100.4 W average power, 7 ps pulses at 20 MHz repetition rate. The all-fiber frontend emits 17 ps, 20 MHz linearly polarized pulses with an average power of 1.5 W. The first stage Yb:YAG thin-rod amplifier is a doublepass amplifier with single end pump. The maximum output power of 20 W was obtained with respect to a pump power of 123 W. The M2 measured at 17 W output was 1.39. The second stage is bi-directionally end pumped and the maximum output power was 55.1 W under 112 W and 113 W pump powers in both directions. The slope efficiency is 20%. In the third stage, the signal was single passed and the maximum output power was 100.4 W under 113 W and 120 W pump powers in both directions. The corresponding slope efficiency is 23.4%. The pulse duration was measured to be 7 ps and the optical spectrum is centered at 1032.3 nm with 0.22 nm full-width at half maximum. The M2 measured at 91 W was 4.0.
We report a high-power chirped pulse amplification (CPA) based on nonlinear amplifying loop mirror (NALM) oscillator and Yb-doped rod-type photonic crystal fiber (PCF). An all-polarization-maintaining NALM mode-locked fiber oscillator was used providing an average power of 9.4 mW, a pulse duration of 5.3 ps at the repetition rate of 21 MHz. After pulse stretching, selection and amplification, an average power of 120 W with the pulse duration of 145 ps at repetition rate of 4.2 MHz has been achieved. The pulse duration is compressed to 14 ps using a pair of reflective gratings coated by gold film. In order to prevent the damage of the gratings, the compressed average power is limited to 51 W. The compressed pulse average power can be further improved by using transmissive gratings coated by dielectric film.
We report a tunable CW dual-wavelength Cr:ZnSe laser with collinear output pumped by a thulium doped fiber laser. By using birefringent plates, we obtained stable dual-wavelength operation between 2365 nm and 2492 nm. The maximum wavelength separation was 127 nm corresponding to a frequency offset of 6.46 THz.
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.