Enhancement of CW THz wave power under noncollinear phase-matching conditions in difference frequency generation

Srinivasa Ragam; Tadao Tanabe; Kyosuke Saito; Yutaka Oyama; Jun Ichi Nishizawa

doi:10.1109/JLT.2009.2022340

Enhancement of CW THz wave power under noncollinear phase-matching conditions in difference frequency generation

Srinivasa Ragam, Tadao Tanabe, Kyosuke Saito, Yutaka Oyama, Jun Ichi Nishizawa

研究成果: Article › 査読

17 被引用数 (Scopus)

抄録

We investigated methods for improvement of continuous- wave (CW) terahertz (THz) output power by laser diode (LD) pumping in noncollinear phase-matched difference frequency generation (DFG). The effects of interaction length and beam spot size of input lasers (near-IR) in GaP crystals were studied. The THz wave power dependence on various sizes of GaP crystals was investigated and it was observed that an output power of 4 nW was obtained with a 20 mm long GaP crystal at 1.5 THz. Also, the THz wave absorption coefficient was dominant for longer GaP crystals at high frequencies (above 2.5 THz). The THz wave power dependence on beam spot size (1.2 mm-300μm) of near-IR lasers at 1.62 THz was studied, and an improvement of THz wave power being seen with a 500 μm beam spot size, while the beam divergence effect was dominant for beam spot sizes below 500 μm.

本文言語	English
ページ（範囲）	3057-3061
ページ数	5
ジャーナル	Journal of Lightwave Technology
巻	27
号	15
DOI	https://doi.org/10.1109/JLT.2009.2022340
出版ステータス	Published - 2009 8月 1
外部発表	はい

ASJC Scopus subject areas

原子分子物理学および光学

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10.1109/JLT.2009.2022340

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title = "Enhancement of CW THz wave power under noncollinear phase-matching conditions in difference frequency generation",

abstract = "We investigated methods for improvement of continuous- wave (CW) terahertz (THz) output power by laser diode (LD) pumping in noncollinear phase-matched difference frequency generation (DFG). The effects of interaction length and beam spot size of input lasers (near-IR) in GaP crystals were studied. The THz wave power dependence on various sizes of GaP crystals was investigated and it was observed that an output power of 4 nW was obtained with a 20 mm long GaP crystal at 1.5 THz. Also, the THz wave absorption coefficient was dominant for longer GaP crystals at high frequencies (above 2.5 THz). The THz wave power dependence on beam spot size (1.2 mm-300μm) of near-IR lasers at 1.62 THz was studied, and an improvement of THz wave power being seen with a 500 μm beam spot size, while the beam divergence effect was dominant for beam spot sizes below 500 μm.",

keywords = "Continuous-wave (CW), Difference frequency generation (DFG), GaP, Phase matching, Terahertz (THz)",

author = "Srinivasa Ragam and Tadao Tanabe and Kyosuke Saito and Yutaka Oyama and Nishizawa, {Jun Ichi}",

note = "Funding Information: Manuscript received December 18, 2008; revised April 07, 2009. First published May 05, 2009; current version published July 06, 2009. This work was supported in part by the Tohoku University Global Centre of Excellence (GCOE) program and in part by the Toyota Research Grant Program.",

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AU - Nishizawa, Jun Ichi

N1 - Funding Information: Manuscript received December 18, 2008; revised April 07, 2009. First published May 05, 2009; current version published July 06, 2009. This work was supported in part by the Tohoku University Global Centre of Excellence (GCOE) program and in part by the Toyota Research Grant Program.

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N2 - We investigated methods for improvement of continuous- wave (CW) terahertz (THz) output power by laser diode (LD) pumping in noncollinear phase-matched difference frequency generation (DFG). The effects of interaction length and beam spot size of input lasers (near-IR) in GaP crystals were studied. The THz wave power dependence on various sizes of GaP crystals was investigated and it was observed that an output power of 4 nW was obtained with a 20 mm long GaP crystal at 1.5 THz. Also, the THz wave absorption coefficient was dominant for longer GaP crystals at high frequencies (above 2.5 THz). The THz wave power dependence on beam spot size (1.2 mm-300μm) of near-IR lasers at 1.62 THz was studied, and an improvement of THz wave power being seen with a 500 μm beam spot size, while the beam divergence effect was dominant for beam spot sizes below 500 μm.

AB - We investigated methods for improvement of continuous- wave (CW) terahertz (THz) output power by laser diode (LD) pumping in noncollinear phase-matched difference frequency generation (DFG). The effects of interaction length and beam spot size of input lasers (near-IR) in GaP crystals were studied. The THz wave power dependence on various sizes of GaP crystals was investigated and it was observed that an output power of 4 nW was obtained with a 20 mm long GaP crystal at 1.5 THz. Also, the THz wave absorption coefficient was dominant for longer GaP crystals at high frequencies (above 2.5 THz). The THz wave power dependence on beam spot size (1.2 mm-300μm) of near-IR lasers at 1.62 THz was studied, and an improvement of THz wave power being seen with a 500 μm beam spot size, while the beam divergence effect was dominant for beam spot sizes below 500 μm.

KW - Continuous-wave (CW)

KW - Difference frequency generation (DFG)

KW - GaP

KW - Phase matching

KW - Terahertz (THz)

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Enhancement of CW THz wave power under noncollinear phase-matching conditions in difference frequency generation

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