Wavelength-agile coherent tunable mid-IR ZGP-OPO source and its applications

Katsuhiko Miyamoto, Kazi Monowar Abedin, Hiromasa Ito

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

3 Citations (Scopus)

Abstract

We report the demonstration of a wavelength-agile coherent tunable mid-infrared (IR) ZnGeP2 (ZGP) optical parametric oscillator (OPO). The mid-IR wavelength was tuned by varying the KTiOPO4 (KTP) OPO pumping wavelength, while the ZGP crystal angle remained fixed. The wavelength of pump OPO was controlled by changing the KTP crystals angle using a Galvano-optical beam scanner. Our mid-IR source can jump to a arbitrary wavelength without scanning through the intermediate wavelengths. A nonlinear optical crystal ZGP is suitable for OPOs in the mid-IR region. In most cases of mid-IR light generation using an OPO, the wavelength tuning is achieved by controlling the phase-matching angle or temperature of the nonlinear optical crystal. However, there are several disadvantages of this method including the walk-off angle, beam pass instability, refraction losses due to the high refractive index of ZGP (n-3.1), slow tuning rate, and so forth. Therefore, we developed a 2-μm-band pump-wavelength tunable mid-IR ZGP-OPO source. The mid-IR wavelength from the ZGP-OPO could be tuned from 5 to 9.8 μm, when the pump wavelength was controlled from 1.95 to 2.3 μm. The output pulse energy at 8μm was 1.3mJ/pulse at repetition rate of 30Hz. As an application of random wavelength accessibility, we could achieve the real-time measurement of phase change (solidification) of candle wax by measuring the change of absorption at two arbitrary wavelengths. We selected two wavelengths on the spectrum where significant changes of absorption upon solidification were detected and performed two-wavelength absorption measurements as the sample is allowed to cool from melted state.

Original languageEnglish
Title of host publicationNonlinear Optics and Applications II
Volume6582
DOIs
Publication statusPublished - 2007
EventNonlinear Optics and Applications II - Prague, Czech Republic
Duration: Apr 16 2007Apr 18 2007

Other

OtherNonlinear Optics and Applications II
CountryCzech Republic
CityPrague
Period4/16/074/18/07

Fingerprint

Optical parametric oscillators
parametric amplifiers
Infrared radiation
Wavelength
wavelengths
Crystals
Pumps
pumps
solidification
crystals
Solidification
Light sources
Tuning
tuning
Pumping (laser)
Phase matching
waxes
Waxes
pulses
phase matching

Keywords

  • Frequency conversion
  • Mid-IR
  • Optical parametric oscillation
  • ZnGeP

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Miyamoto, K., Abedin, K. M., & Ito, H. (2007). Wavelength-agile coherent tunable mid-IR ZGP-OPO source and its applications. In Nonlinear Optics and Applications II (Vol. 6582). [65820U] https://doi.org/10.1117/12.723240

Wavelength-agile coherent tunable mid-IR ZGP-OPO source and its applications. / Miyamoto, Katsuhiko; Abedin, Kazi Monowar; Ito, Hiromasa.

Nonlinear Optics and Applications II. Vol. 6582 2007. 65820U.

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

Miyamoto, K, Abedin, KM & Ito, H 2007, Wavelength-agile coherent tunable mid-IR ZGP-OPO source and its applications. in Nonlinear Optics and Applications II. vol. 6582, 65820U, Nonlinear Optics and Applications II, Prague, Czech Republic, 4/16/07. https://doi.org/10.1117/12.723240
Miyamoto K, Abedin KM, Ito H. Wavelength-agile coherent tunable mid-IR ZGP-OPO source and its applications. In Nonlinear Optics and Applications II. Vol. 6582. 2007. 65820U https://doi.org/10.1117/12.723240
Miyamoto, Katsuhiko ; Abedin, Kazi Monowar ; Ito, Hiromasa. / Wavelength-agile coherent tunable mid-IR ZGP-OPO source and its applications. Nonlinear Optics and Applications II. Vol. 6582 2007.
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