Parametric amplification and oscillation with walkoff-compensating crystals

Armstrong, Darrell J.; Alford, W. J.; Raymond, T. D.; Smith, Arlee V.; Bowers, Mark S.

doi:10.1364/josab.14.000460

Cited by 95 publications

(60 citation statements)

References 15 publications

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“…The OPO "gain" medium consists of a pair of 12 mm long type I BBO crystals that are 5 mm ϫ 7 mm in cross section and arranged in a linear cavity configuration. 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].…”

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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“…19,20 For example, if the three waves are not perfectly phase matched in the¯rst crystal and in the second crystal they are perfectly phase matched. So, the three waves leave thē rst crystal with a de¯nite phase relation between them.…”

Section: Relative Intercrystal Phase Shiftmentioning

confidence: 99%

Modeling and design of singly-resonant optical parametric oscillator with an intracavity idler absorber for enhanced conversion efficiency for the signal

Singh

Shenoy

2017

J. Nonlinear Optic. Phys. Mat.

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We present modeling and design of continuous-wave (cw) singly-resonant optical parametric oscillator (SR-OPO) with an intracavity idler absorber to enhance the conversion e±ciency for the signal by suppressing the back conversion of the signal and idler to the pump. Following plane wave analysis, we arrive at the optimum parameters of the OPO, with the intracavity idler absorber, to achieve high conversion e±ciency for the signal. For a given pump intensity, we have analyzed the e®ect of position and number of absorbers required for optimum performance of the device. The model is also extended to the case in which the signal is absorbed, yielding higher conversion e±ciency for the idler (in mid-IR region). The magnitude of absorption and the e®ect of intercrystal phase shift on the conversion e±ciency are also discussed. We also present an analytical solution for twin-crystal SR-OPO with an absorber in between, taking into account the variation of signal amplitude inside the cavity, we rea±rm that the frequently used constant signal-wave approximation is valid if the re°ectivity of the output coupler is high for the signal.

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“…Here, the two KTP crystals with a size of 7 × 7 × 20 mm 3 were cut in a special way (θ, 63.5°; Φ, 0°) to realize type II phase matching. It effectively reduced the walk-off effect by placing two KTP crystals with adverse orientations, while the effective nonlinear coefficient was still acceptable [27,28]. In order to reduce loss, both sides of the KTP crystals were AR coated at the pump, signal, and idler light.…”

Section: Ktp-based Opo Lasermentioning

confidence: 99%

High-speed intravascular photoacoustic imaging at 17 μm with a KTP-based OPO

Hui

et al. 2015

Biomed. Opt. Express

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Lipid deposition inside the arterial wall is a hallmark of plaque vulnerability. Based on overtone absorption of C-H bonds, intravascular photoacoustic (IVPA) catheter is a promising technology for quantifying the amount of lipid and its spatial distribution inside the arterial wall. Thus far, the clinical translation of IVPA technology is limited by its slow imaging speed due to lack of a high-pulse-energy high-repetition-rate laser source for lipid-specific first overtone excitation at 1.7 μm. Here, we demonstrate a potassium titanyl phosphate (KTP)-based optical parametric oscillator with output pulse energy up to 2 mJ at a wavelength of 1724 nm and with a repetition rate of 500 Hz. Using this laser and a ring-shape transducer, IVPA imaging at speed of 1 frame per sec was demonstrated. Performance of the IVPA imaging system's resolution, sensitivity, and specificity were characterized by carbon fiber and a lipid-mimicking phantom. The clinical utility of this technology was further evaluated ex vivo in an excised atherosclerotic human femoral artery with comparison to histology. 503-505 (1994). 2. P. Libby, "Inflammation in atherosclerosis," Nature 420(6917), 868-874 (2002 385-390 (2014). 25. Y. Li, X. Gong, C. Liu, R. Lin, W. Hau, X. Bai, and L. Song, "High-speed intravascular spectroscopic photoacoustic imaging at 1000 A-lines per second with a 0.9-mm diameter catheter," J.

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Parametric amplification and oscillation with walkoff-compensating crystals

Cited by 95 publications

References 15 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

Modeling and design of singly-resonant optical parametric oscillator with an intracavity idler absorber for enhanced conversion efficiency for the signal

High-speed intravascular photoacoustic imaging at 17 μm with a KTP-based OPO

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