Broadly tunable (993–1110  nm) Yb:YLF laser

Author:

Demirbas Umit12ORCID,Thesinga Jelto1,Kellert Martin1,Reuter Simon1,Pergament Mikhail1,Kärtner Franz X.134ORCID

Affiliation:

1. Center for Free-Electron Laser Science CFEL

2. Antalya Bilim University

3. University of Hamburg

4. The Hamburg Centre for Ultrafast Imaging

Abstract

We have investigated room-temperature continuous-wave (cw) lasing performance of Yb:YLF oscillators in detail using rod-type crystals with low Yb-doping (2%). The laser is pumped by a low-cost, high brightness, 10 W, 960 nm single-emitter multimode diode. Laser performance is acquired in both E / / a and E / / c configurations, using 12 different output couplers with transmission ranging from 0.015% to 70%. We have estimated the passive loss of the Yb:YLF crystal as 0.06% per cm, corresponding to an impressive crystal figure of merit above 4000. The low-doping level not only reduces the system losses but also minimizes the thermal load as the low doped crystals enable distribution of heat load in a greater volume. Using the advantages of lower loss and improved thermal behavior, we have achieved cw output power above 4 W, cw slope efficiencies up to 78%, and a record cw tuning range covering the 993–1110 nm region (117 nm). The output power performance achieved in this initial work is limited by the available pump power, and future room-temperature Yb:YLF systems have the potential to produce higher output power levels.

Funder

European Research Council

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering

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