OP-GaAs OPO pumped by 2μm Q-switched lasers

Tm;Ho:silica fiber laser and Ho:YAG laser

C. Kieleck*, A. Hildenbrand, M. Eichhorn, D. Faye, E. Lallier, B. Gérard, S. D. Jackson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

23 Citations (Scopus)

Abstract

Improvement in hybrid vapour phase epitaxy growing techniques of quasi-phase-matched orientation-patterned GaAs (OP-GaAs) allows larger sample thickness and permits efficient operation as a mid-infrared optical parametric oscillator at Watt-level average output powers [1-3]. Especially its low absorption loss (∼ 0.01 cm-1), its laser damage threshold comparable to ZGP (∼ 2 J/cm2) combined with a large nonlinear coefficient, a good thermal conductivity, excellent mechanical properties, and a wide transparency range (0.9-17 μm) are suitable properties for efficient non-critical phase matched OPOs. As there is no natural birefringence in GaAs, phase matching is independent of polarization and propagation direction, offering the ability to pump OP-GaAs with a variety of polarization states. Thus, even unpolarized or poorly polarized sources like simple fiber lasers have been efficiently used as pump sources [4-5]. The paper discuss the best OP-GaAs OPO results achieved, to our knowledge, using a Q-switched 2.09 μm Ho:YAG laser as pump source as well as results obtained with an OP-GaAs OPO directly pumped by a 2.09 μm Q-switched Tm,Ho:silica fiber laser. With a 2.09 μm Q-switched Ho:YAG fiber laser pump source up to 2.9 W of average output power was achieved at 20 kHz repetition rate, 3.9 W at 40 kHz and 4.9 W at 50 kHz. With a 2.09 μm Q-switched Tm3+,Ho3+:silica fiber laser pump source, up to 2.2 W of average output power was achieved at 40 kHz repetition rate, 1.9 W at 60 kHz and 1.3 W at 75 kHz in the mid-infrared range.

Original languageEnglish
Title of host publicationTechnologies for Optical Countermeasures VII
EditorsDavid H. Titterton, Mark A. Richardson
Place of PublicationWashington, DC
PublisherSPIE
Pages1-8
Number of pages8
Volume7836
ISBN (Print)9780819483546
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventTechnologies for Optical Countermeasures VII - Toulouse, France
Duration: 22 Sep 201023 Sep 2010

Other

OtherTechnologies for Optical Countermeasures VII
CountryFrance
CityToulouse
Period22/09/1023/09/10

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