Frequency doubling of focused laser beams for high pulse energy at 471nm

Xin Wang; Frank Kallmeyer; Sha Wang; A. Ding; Hans Joachim Eichler

doi:10.1117/12.823007

Frequency doubling of focused laser beams for high pulse energy at 471nm

Xin Wang^*, Frank Kallmeyer, Sha Wang, A. Ding, Hans Joachim Eichler

^*Corresponding author for this work

Technical University of Berlin

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

An actively Q-switched Nd:GSAG laser with 942nm wavelength was frequency doubled in a critically type-I phase-matched LBO. Maximum pulse energy of 8mJ with 300ns pulse duration at 471 nm was obtained with 19mJ incident radiation at 10Hz. The corresponding conversion efficiency was 42%. The frequency doubling of a focused Gaussian beam involves spatially dependent phase mismatching due to beam divergence. It decreases the conversion efficiency and deteriorates the beam quality. According to the theoretical calculation, elliptical focusing was used to improve the second harmonic beam quality and slightly increase the conversion efficiency.

Original language	English
Article number	71940M
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7194
DOIs	https://doi.org/10.1117/12.823007
Publication status	Published - 2009
Externally published	Yes
Event	Laser Resonators and Beam Control XI - San Jose, CA, United States Duration: 26 Jan 2009 → 27 Jan 2009

Keywords

Elliptical Gaussian beam
High energy
Second harmonic generation (SHG)

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10.1117/12.823007

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title = "Frequency doubling of focused laser beams for high pulse energy at 471nm",

abstract = "An actively Q-switched Nd:GSAG laser with 942nm wavelength was frequency doubled in a critically type-I phase-matched LBO. Maximum pulse energy of 8mJ with 300ns pulse duration at 471 nm was obtained with 19mJ incident radiation at 10Hz. The corresponding conversion efficiency was 42\%. The frequency doubling of a focused Gaussian beam involves spatially dependent phase mismatching due to beam divergence. It decreases the conversion efficiency and deteriorates the beam quality. According to the theoretical calculation, elliptical focusing was used to improve the second harmonic beam quality and slightly increase the conversion efficiency.",

keywords = "Elliptical Gaussian beam, High energy, Second harmonic generation (SHG)",

author = "Xin Wang and Frank Kallmeyer and Sha Wang and A. Ding and Eichler, \{Hans Joachim\}",

year = "2009",

doi = "10.1117/12.823007",

language = "English",

volume = "7194",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

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note = "Laser Resonators and Beam Control XI ; Conference date: 26-01-2009 Through 27-01-2009",

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TY - JOUR

T1 - Frequency doubling of focused laser beams for high pulse energy at 471nm

AU - Wang, Xin

AU - Kallmeyer, Frank

AU - Wang, Sha

AU - Ding, A.

AU - Eichler, Hans Joachim

PY - 2009

Y1 - 2009

N2 - An actively Q-switched Nd:GSAG laser with 942nm wavelength was frequency doubled in a critically type-I phase-matched LBO. Maximum pulse energy of 8mJ with 300ns pulse duration at 471 nm was obtained with 19mJ incident radiation at 10Hz. The corresponding conversion efficiency was 42%. The frequency doubling of a focused Gaussian beam involves spatially dependent phase mismatching due to beam divergence. It decreases the conversion efficiency and deteriorates the beam quality. According to the theoretical calculation, elliptical focusing was used to improve the second harmonic beam quality and slightly increase the conversion efficiency.

AB - An actively Q-switched Nd:GSAG laser with 942nm wavelength was frequency doubled in a critically type-I phase-matched LBO. Maximum pulse energy of 8mJ with 300ns pulse duration at 471 nm was obtained with 19mJ incident radiation at 10Hz. The corresponding conversion efficiency was 42%. The frequency doubling of a focused Gaussian beam involves spatially dependent phase mismatching due to beam divergence. It decreases the conversion efficiency and deteriorates the beam quality. According to the theoretical calculation, elliptical focusing was used to improve the second harmonic beam quality and slightly increase the conversion efficiency.

KW - Elliptical Gaussian beam

KW - High energy

KW - Second harmonic generation (SHG)

UR - http://www.scopus.com/inward/record.url?scp=65649109731&partnerID=8YFLogxK

U2 - 10.1117/12.823007

DO - 10.1117/12.823007

M3 - Conference article

AN - SCOPUS:65649109731

SN - 0277-786X

VL - 7194

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

M1 - 71940M

T2 - Laser Resonators and Beam Control XI

Y2 - 26 January 2009 through 27 January 2009

ER -

Frequency doubling of focused laser beams for high pulse energy at 471nm

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Keywords

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