Infrared difference frequency generation

Martin, Michael; Thomas, E. L.

doi:10.1109/jqe.1966.1073958

Cited by 3 publications

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“…A corollary of the present work is a method for generating output in the mid-IR to terahertz range where there is presently strong demand in medical, remote sensing and defence applications. Previously, Raman lasers have been used to generate IR output via DFG [24,25], however, the output wavelengths are limited to integer multiples of the Raman shift. With a second Raman mode, the difference frequencies extend much lower and the number of options is greatly increased (refer Table 1).…”

Section: Discussionmentioning

confidence: 99%

Increased wavelength options in the visible and ultraviolet for Raman lasers operating on dual Raman modes

Mildren¹,

Piper²

2008

Opt. Express

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We report increased wavelength options from Raman lasers for Raman media having two Raman modes of similar gain coefficient. For an external-cavity potassium gadolinium tungstate Raman laser pumped at 532 nm, we show that two sets of Stokes orders are generated simultaneously by appropriate orientation of the Raman crystal, and also wavelengths that correspond to sums of the two Raman modes. Up to 14 visible Stokes lines were observed in the wavelength range 555-675 nm. The increase in Stokes wavelengths also enables a much greater selection of wavelengths to be accessed via intracavity nonlinear sum frequency and difference frequency mixing. For example, we demonstrate 30 output wavelength options for a wavelength-selectable 271-321 nm Raman laser with intracavity sum frequency mixing in BBO. We also present a theoretical analysis that enables prediction of wavelength options for dual Raman mode systems.

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Section: Discussionmentioning

confidence: 99%

Increased wavelength options in the visible and ultraviolet for Raman lasers operating on dual Raman modes

Mildren¹,

Piper²

2008

Opt. Express

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“…Frequency conversion into the midinfrared by a combination of stimulated Raman scattering 1SRS2 and difference frequency mixing 1DFM2 was first proposed 1and demonstrated2 in 1966. 2 Recently a Nd:YAG hybrid system 11 Hz2 that used a combination of SRS in methane and optical parametric amplification to amplify the 1.54-µm Stokes light with 3.43-µm light being produced as a byproduct was reported. 3 In this paper we present results for a system we have developed to produce narrow-band pulsed light at 3.43 µm in the millijoule energy range by using an injection-seeded single-longitudinal mode 1SLM2 Nd:YAG pump laser.…”

Section: Introductionmentioning

confidence: 99%

Methane detection with a narrow-band source at 34 μm based on a Nd:YAG pump laser and a combination of stimulated Raman scattering and difference frequency mixing

Lancaster

Dawes

1996

Appl. Opt.

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We report the characterization of a 10-Hz pulsed, narrow-band source that is coincident with a fundamental ν(3) rovibrational absorption of methane at 3.43 µm. To generate this midinfrared wavelength, an injection-seeded 1.06-µm Nd:YAG laser is difference frequency mixed with first Stokes light generated in a high-pressure methane cell (1.06 ? 1.54 µm) to result in light at a wavelength of 3.43 µm, that is, the ν(1) Raman active frequency of methane (~2916.2 cm(-1)). With a modest-energy Nd:YAG laser (200 mJ), a few millijoules of this midinfrared energy can be generated with a pulse width of ~7 ns (FWHM). The methane ν(1) frequency can be pressure tuned over 8-32 atm (corresponding to ~13 GHz) and scanned across part of the ν(3)P(10) rovibrational level of methane, resulting in a peak measured methane absorption coefficient of 4.2 cm(-1) atm(-1).

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“…Tunability of the Nd glass laser is to be achieved by using some external mode selection technique such as Fabry-P6rot filter which is tilt or thermal tuned. Hirono, 1964], thermal tunability studies of ruby lasers [Abella and Cummins, 1961], and stimulated Raman-scattering studies [Eckhardt, 1966;Martin and Thomas, 1966].…”

Section: Introductionmentioning

confidence: 99%

Number Density Determination in the Atmosphere of O₂, H₂O, and CO₂ Gas Constituents by Use of a High Intensity Laser Beam

Dobbins¹,

LaGrone²

1969

Radio Science

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A method is developed whereby number densities of several of the atmospheric gas constituents can be determined as a function of altitude. The method employs two laser signals of different wavelengths, one occurring in an absorption region of the gas in consideration and one occurring in a spectral region where no absorption takes place. Returned scattered signals are collected and used along with absorption line strength and line width to determine the number density. The method described affords an indirect way of determining number densities of a specific constituent of the atmosphere by electromagnetic probing.

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Infrared difference frequency generation

Cited by 3 publications

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Increased wavelength options in the visible and ultraviolet for Raman lasers operating on dual Raman modes

Increased wavelength options in the visible and ultraviolet for Raman lasers operating on dual Raman modes

Methane detection with a narrow-band source at 34 μm based on a Nd:YAG pump laser and a combination of stimulated Raman scattering and difference frequency mixing

Number Density Determination in the Atmosphere of O₂, H₂O, and CO₂ Gas Constituents by Use of a High Intensity Laser Beam

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Infrared difference frequency generation

Cited by 3 publications

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Increased wavelength options in the visible and ultraviolet for Raman lasers operating on dual Raman modes

Increased wavelength options in the visible and ultraviolet for Raman lasers operating on dual Raman modes

Methane detection with a narrow-band source at 34 μm based on a Nd:YAG pump laser and a combination of stimulated Raman scattering and difference frequency mixing

Number Density Determination in the Atmosphere of O2, H2O, and CO2 Gas Constituents by Use of a High Intensity Laser Beam

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Number Density Determination in the Atmosphere of O₂, H₂O, and CO₂ Gas Constituents by Use of a High Intensity Laser Beam