Share Email Print

Proceedings Paper

High average power difference-frequency generation of picosecond mid-IR pulses at 80MHz using an Yb-fiber laser pumped optical parametric oscillator
Author(s): Julia Michel; Marcus Beutler; Ingo Rimke; Edlef Büttner; Paolo Farinello; Antonio Agnesi; Valentin P. Petrov
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

We present an efficient coherent source widely tunable in the mid-infrared spectral range consisting of a commercial picosecond Yb-fiber laser operating at 80 MHz repetition rate, a synchronously-pumped OPO (SPOPO) and differencefrequency generation (DFG) in AgGaSe2. With an average input pump power of 7.8 W at 1032 nm and at 80 MHz, the SPOPO outputs are tunable from 1380 to 1980 nm (Signal) and from 2.1 to ~4 μm (Idler) with pulse durations between 2.1 and 2.6 ps over the entire tuning range. After temporally overlapping Signal and Idler through a delay line, the two beams are spatially recombined with a dichroic mirror (reflecting for the Signal in s-polarization and transmitting for the Idler in p-polarization), and focused by a 150 mm CaF2 lens to a common focus. For DFG we employ an AR-coated 10- mm thick AgGaSe2 nonlinear crystal cut for type-I interaction at θ =52°. The generated mid-infrared picosecond pulses are continuously tunable between 5 and 18 μm with average power up to 130 mW at 6 μm and more than 1 mW at 18 μm. Their spectra and autocorrelation traces are measured up to 15 μm and 11 μm, respectively, and indicate that the input spectral bandwidth and pulse duration are maintained to a great extent in the nonlinear frequency conversion processes. The pulse duration slightly decreases from 2.1 to 1.9 ps at 6.7 μm while the spectral bandwidth supports ~1.5 ps (~10 cm-1)durations across the entire mid-infrared tuning range. For the first time narrow-band mid-infrared pulses with energy exceeding 1 nJ are generated at such high repetition rates.

Paper Details

Date Published: 27 February 2015
PDF: 7 pages
Proc. SPIE 9347, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV, 93470Q (27 February 2015); doi: 10.1117/12.2078848
Show Author Affiliations
Julia Michel, APE GmbH (Germany)
Marcus Beutler, APE GmbH (Germany)
Ingo Rimke, APE GmbH (Germany)
Edlef Büttner, APE GmbH (Germany)
Paolo Farinello, Univ. degli Studi di Pavia (Italy)
Antonio Agnesi, Univ. degli Studi di Pavia (Italy)
Valentin P. Petrov, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)

Published in SPIE Proceedings Vol. 9347:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIV
Konstantin L. Vodopyanov, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?