Multi-stage ytterbium fiber-amplifier seeded by a gain-switched laser diode

Ryser, M.; Pilz, S.; Burn, A.; Romano, V. (2012). Multi-stage ytterbium fiber-amplifier seeded by a gain-switched laser diode. ALT Proceedings, 1(1) Bern Open Publishing 10.12684/alt.1.101

101-273-2-PB.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (932kB) | Preview

We demonstrated all-fiber amplification of 11 ps pulses from a gain-switched laser diode at 1064 nm. The diode was driven at a repetition rate of 40 MHz and delivered 13 µW of fiber-coupled average output power. For the low output pulse energy of 325 fJ we have designed a multi-stage core pumped pre-amplifier in order to keep the contribution of undesired amplified spontaneous emission as low as possible. By using a novel time-domain approach for determining the power spectral density ratio (PSD) of signal to noise, we identified the optimal working point for our pre-amplifier. After the pre-amplifier we reduced the 40 MHz repetition rate to 1 MHz using a fiber coupled pulse-picker. The final amplification was done with a cladding pumped Yb-doped large mode area fiber and a subsequent Yb-doped rod-type fiber. With our setup we reached a total gain of 73 dB, resulting in pulse energies of >5.6 µJ and peak powers of >0.5 MW. The average PSD-ratio of signal to noise we determined to be 18/1 at the output of the final amplification stage.

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Ryser, Manuel, Burn, Andy, Romano, Valerio


600 Technology > 620 Engineering




Bern Open Publishing




Factscience Import

Date Deposited:

04 Oct 2013 14:43

Last Modified:

05 Dec 2022 14:13

Publisher DOI:




URI: (FactScience: 225764)

Actions (login required)

Edit item Edit item
Provide Feedback