Development of injection-seeded, pulsed optical parametric generator/oscillator systems for high-resolution spectroscopy

Kulatilaka, Waruna D.; Anderson, Thomas N.; Bougher, Thomas L.; Lucht, Robert P.

doi:10.1007/s00340-005-1772-y

Cited by 52 publications

(22 citation statements)

References 40 publications

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“…The crystals are oriented to provide walk-off compensation between the pump and signal͞idler beams, which provides higher effective gain for the relatively small cross-sectional area (ϳ3 mm diameter) pump beam [15,16]. The cavity employs a broadband high reflector and output coupler coated for 20%-30% reflectivity in the wavelength range of 600-850 nm, which is in between that of the low-and high-finesse cavities employed in the OPO system described in [17]. As will be discussed in detail, this cavity provides feedback at both the signal and idler wavelengths, with round-trip gain, which greatly exceeds the total cavity losses.…”

Section: Methodsmentioning

confidence: 99%

Narrow-linewidth megahertz-repetition-rate optical parametric oscillator for high-speed flow and combustion diagnostics

et al. 2007

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We demonstrate the ability to generate ultra-high-frequency sequences of broadly wavelength-tunable, highintensity laser pulses using a custom-built optical parametric oscillator pumped by the thirdharmonic output of a "burst-mode" Nd:YAG laser. Burst sequences consisting of 6-10 pulses separated in time by 6-10 Îs are obtained, with average total conversion efficiency from the 355 nm pump to the near-IR signal and idler wavelengths of 33%. Typical individual pulse output energy for the signal and idler beams is in the range of 4-6 mJ, limited by the available pump energy. Line narrowing is demonstrated by means of injection seeding the idler wave using a low-power external-cavity diode laser at 827 nm. It is shown that seeding reduces the time-averaged linewidth of both the signal and idler outputs to 300 MHz, which is near the 220 MHz Fourier transform limit. Line narrowing is achieved without recourse to active cavity stabilization. RightsThis paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: https://www.osapublishing.org/ ao/abstract.cfm?uri=ao-47-1-64. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. We demonstrate the ability to generate ultra-high-frequency sequences of broadly wavelength-tunable, high-intensity laser pulses using a custom-built optical parametric oscillator pumped by the thirdharmonic output of a "burst-mode" Nd:YAG laser. Burst sequences consisting of 6 -10 pulses separated in time by 6-10 s are obtained, with average total conversion efficiency from the 355 nm pump to the near-IR signal and idler wavelengths of ϳ33%. Typical individual pulse output energy for the signal and idler beams is in the range of 4-6 mJ, limited by the available pump energy. Line narrowing is demonstrated by means of injection seeding the idler wave using a low-power external-cavity diode laser at 827 nm. It is shown that seeding reduces the time-averaged linewidth of both the signal and idler outputs to ϳ300 MHz, which is near the 220 MHz Fourier transform limit. Line narrowing is achieved without recourse to active cavity stabilization.

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Section: Methodsmentioning

confidence: 99%

Narrow-linewidth megahertz-repetition-rate optical parametric oscillator for high-speed flow and combustion diagnostics

et al. 2007

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“…The primary differences from that system are the use of a four-crystal (two KTP, two KTA) amplifier stage and the replacement of the SLM OPO with a telecom distributed-feedback diode laser as the seed source (32). The output is spectrally separated in a CaF2 prism and tuned to the desired absorption resonance by using a photoacoustic cell while measuring the seed wavelength with a fiber-coupled wavemeter.…”

Section: Experimental Methodsmentioning

confidence: 99%

Vibrational vs. translational energy in promoting a prototype metal–hydrocarbon insertion reaction

Proctor

Davis

2008

Proc. Natl. Acad. Sci. U.S.A.

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The reaction Y ؉ CH4 3 HYCH3 3 YCH2 ؉ H2 is initiated by C-H insertion involving a 20 ؎ 3 kcal/mol potential energy barrier. The reaction is studied in crossed molecular beams under two different conditions with nearly the same total energy. One experiment is carried out at a collision energy of 15.1 kcal/mol with one quantum of CH 4 antisymmetric (3) stretching vibrational excitation (8.63 kcal/mol), the other at a collision energy of 23.8 kcal/mol. The reaction cross-section for C-H stretch excited methane (s) is found to be at least a factor of 2.2 times larger than for ground-state methane ( g) at the same total energy. mode-specific chemistry ͉ potential energy barrier ͉ reaction dynamics T he concepts of early and late potential energy barriers made it possible to rationalize in simple, intuitive terms the roles of reactant translational and vibrational energy in promoting atom ϩ diatom reactions (1). The observation of mode-and bond-specific effects in gas phase reactions such as Cl ϩ CH 4 3 HCl ϩ CH 3 and Cl ϩ H 2 O 3 HCl ϩ OH have illustrated that the dynamics of polyatomic systems involving multiple vibrational degrees of freedom can also be highly sensitive to the reactant vibrational state (2, 3).In a recent study, Yan and coworkers provided the first direct comparison of C-H reactant vibrational energy to reactant translational energy in promoting the Cl ϩ CHD 3 3 HCl ϩ CD 3 abstraction reaction (4). Although C-H antisymmetric vibrational excitation enhanced reactivity, it was found to be somewhat less effective than an equivalent amount of reactant translational energy. However, CHD 3 bending excitation induced by thermal excitation was somewhat more effective in promoting reaction than an equivalent amount of translational energy. For gaseous polyatomic systems, different forms of reactant energy may not be equivalent in facilitating passage through the transition state for atom transfer (2-5).The dissociative adsorption of methane (CH 4 ) on a metal surface is the rate-limiting step in the steam re-forming of methane, used to produce Ϸ9 million tons of hydrogen annually in the United States. It is well established that reactant translational and vibrational excitation are both effective in promoting this activated process (6). Significant mode-and bondspecific effects have been observed for this class of reaction. Smith and coworkers showed that antisymmetric CH 4 vibrational excitation ( 3 ) is somewhat more effective than an equivalent amount of translational energy in promoting reaction on a Ni(111) surface (7), in contrast to earlier work on Ni(100) (6) and Pt(111) (8), where translational energy was more effective in promoting reaction. Juurlink et al. (9) demonstrated that CH 4 overtone bending excitation (3 4 ) is much less effective than 3 on Ni(100) and Ni(111), despite the higher energy of 3 4 . Maroni and coworkers (10) found that CH 4 symmetric excitation ( 1 ) is about an order of magnitude more effective than antisymmetric stretching ( 3 ) in promoting reaction on Ni(100) at nearly...

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“…Complex OPA/OPG systems in other wavelength regions have been developed with a narrow linewidth. 54 However, it is difficult to predict how they can be implemented with a multiwavelength IPDA lidar for space because of their complexity. If the seed laser power can be significantly scaled up then it may be possible to achieve energies of 600 μJ out of the OPA with a narrow linewidth.…”

Section: Discussionmentioning

confidence: 99%

Methane optical density measurements with an integrated path differential absorption lidar from an airborne platform

Riris

Numata

et al. 2017

J. Appl. Remote Sens

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Development of injection-seeded, pulsed optical parametric generator/oscillator systems for high-resolution spectroscopy

Cited by 52 publications

References 40 publications

Narrow-linewidth megahertz-repetition-rate optical parametric oscillator for high-speed flow and combustion diagnostics

Narrow-linewidth megahertz-repetition-rate optical parametric oscillator for high-speed flow and combustion diagnostics

Vibrational vs. translational energy in promoting a prototype metal–hydrocarbon insertion reaction

Methane optical density measurements with an integrated path differential absorption lidar from an airborne platform

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