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Determination of the mid-IR femtosecond surface-damage threshold of germanium

Determination of the mid-IR femtosecond surface-damage threshold of germanium
Determination of the mid-IR femtosecond surface-damage threshold of germanium
To assess the potential uses of germanium as a nonlinear material in the mid IR we have measured the surface-damage threshold of germanium optical windows using femtosecond pulses at a wavelength of 3.9 µm. By working with a wavelength corresponding to a photon energy of less than half the band-gap energy, free-carrier generation due to one- and two-photon absorption was eliminated. The laser pulses had an energy of 5.5 µJ, a duration of 255 fs, and were focused to a waist size of approximately 100 µm. The multi-shot damage threshold of the germanium windows was estimated to be approximately 94 GW/cm2. The data should be of immediate benefit to industrial laser researchers and applications engineers working in the mid-IR region.
0947-8396
127-133
Malik, Rohit
fde9bd38-e253-494e-ba45-b9d1363fee0a
Mills, Ben
05f1886e-96ef-420f-b856-4115f4ab36d0
Price, Jonathan H.V.
fddcce17-291b-4d01-bd38-8fb0453abdc8
Petrovich, Marco
bfe895a0-da85-4a40-870a-2c7bfc84a4cf
Moktadir, Zakaria
34472668-ffda-4287-8fea-2c4f3bf1e2fa
Li, Zhihong
56119e60-7f35-4072-9344-27be4ce17a9a
Rutt, Harvey N.
e09fa327-0c01-467a-9898-4e7f0cd715fc
Malik, Rohit
fde9bd38-e253-494e-ba45-b9d1363fee0a
Mills, Ben
05f1886e-96ef-420f-b856-4115f4ab36d0
Price, Jonathan H.V.
fddcce17-291b-4d01-bd38-8fb0453abdc8
Petrovich, Marco
bfe895a0-da85-4a40-870a-2c7bfc84a4cf
Moktadir, Zakaria
34472668-ffda-4287-8fea-2c4f3bf1e2fa
Li, Zhihong
56119e60-7f35-4072-9344-27be4ce17a9a
Rutt, Harvey N.
e09fa327-0c01-467a-9898-4e7f0cd715fc

Malik, Rohit, Mills, Ben, Price, Jonathan H.V., Petrovich, Marco, Moktadir, Zakaria, Li, Zhihong and Rutt, Harvey N. (2013) Determination of the mid-IR femtosecond surface-damage threshold of germanium. Applied Physics A: Materials Science & Processing, 113 (1), 127-133. (doi:10.1007/s00339-012-7499-9).

Record type: Article

Abstract

To assess the potential uses of germanium as a nonlinear material in the mid IR we have measured the surface-damage threshold of germanium optical windows using femtosecond pulses at a wavelength of 3.9 µm. By working with a wavelength corresponding to a photon energy of less than half the band-gap energy, free-carrier generation due to one- and two-photon absorption was eliminated. The laser pulses had an energy of 5.5 µJ, a duration of 255 fs, and were focused to a waist size of approximately 100 µm. The multi-shot damage threshold of the germanium windows was estimated to be approximately 94 GW/cm2. The data should be of immediate benefit to industrial laser researchers and applications engineers working in the mid-IR region.

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More information

e-pub ahead of print date: 22 December 2012
Published date: October 2013
Organisations: Optoelectronics Research Centre, Electronics & Computer Science

Identifiers

Local EPrints ID: 352225
URI: https://eprints.soton.ac.uk/id/eprint/352225
ISSN: 0947-8396
PURE UUID: d8217504-666f-4758-a30f-d7d836f25a10
ORCID for Ben Mills: ORCID iD orcid.org/0000-0002-1784-1012
ORCID for Jonathan H.V. Price: ORCID iD orcid.org/0000-0003-0256-9172
ORCID for Marco Petrovich: ORCID iD orcid.org/0000-0002-3905-5901

Catalogue record

Date deposited: 07 May 2013 10:40
Last modified: 29 Aug 2019 00:47

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Contributors

Author: Rohit Malik
Author: Ben Mills ORCID iD
Author: Marco Petrovich ORCID iD
Author: Zakaria Moktadir
Author: Zhihong Li
Author: Harvey N. Rutt

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