Modelling of thermal effects within a 2-μm pumped ZGP optical parametric oscillator operating in the mid-infrared

Hutcheon, R. J.; Perrett, Brian J.; Mason, Paul

doi:10.1117/12.577520

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…However, SNLO does not take account of other deleterious effects that might be consequent upon optical loss, particularly the absorptive component, such as thermally induced lensing or dephasing of the pump and generated beams. Modelling of a singly resonant ZGP OPO to include these thermo-optic effects has been undertaken [7] and the results show that as the absorption coefficient at the pump wavelength increases the threshold pump intensity rises whilst the slope efficiency for wavelength conversion reduces. This work will be extended to the doubly resonant ZGP OPO case studied here and it is probable that thermal effects will be shown to account for the disparity between the experimentally measured variation in slope efficiency and the SNLO model predictions.…”

Section: Assessment Of Opo Performancementioning

confidence: 99%

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Studies of optical loss in ZGP OPO devices for near- to mid-infrared conversion

Perrett

Harris

2004

SPIE Proceedings

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Zinc germanium phosphide (ZGP) is well suited to use in optical parametric oscillators (OPOs) for conversion of near-infrared laser output into the mid-infrared waveband (3 to 5 µm). Typical OPO applications seek to exploit pump wavelengths close to 2 µm so that both the output wavelengths fall within the mid-infrared waveband. However, the material typically suffers optical loss arising from growth defects that becomes significant at wavelengths below about 2.5 µm. We report the results of calorimetric studies that show that the loss can comprise both absorptive and scattering components. We have assessed the affect of loss at the pump wavelength on the conversion efficiency of a high pulse repetition frequency, doubly-resonant, ZGP OPO pumped with 2.094 µm radiation generated by a wavelength doubled Nd:YLF laser. The OPO used crystals having loss coefficients in the range 0.03 cm -1 to 0.3 cm -1 . The reduction in slope efficiency for the conversion process was evaluated over a range of pump beam diameters (1/e 2 intensity) from 0.12 mm to 0.30 mm. For the largest beam diameter a slope efficiency of 57 % was measured for a ZGP OPO crystal having a loss coefficient of 0.03 cm -1 . The slope efficiency reduced to about 30 % when the loss coefficient was increased to 0.3 cm -1 .

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Section: Assessment Of Opo Performancementioning

confidence: 99%

“…A more detailed analysis of the thermal effects generated by the absorption of the pump beam is made elsewhere [7] .…”

Section: Assessment Of Opo Performancementioning

confidence: 99%

Studies of optical loss in ZGP OPO devices for near- to mid-infrared conversion

Perrett

Harris

2004

SPIE Proceedings

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“…On the other hand, thermal effects, resulting in the absorption of power in the crystal [22], prevent good stability of the signal [23] and high conversion efficiency [24]. Analytical models [25][26][27] of thermal effects demonstrate that spatially nonuniform heating can result in changes in the refractive index of the nonlinear medium. Therma-induced heating can be observed using a beam quality factor [22] and pump beam [28].…”

Section: Introductionmentioning

confidence: 99%

A Passively Wavelength-Stabilized Mid-Infrared Optical Parametric Oscillator

et al. 2022

Photonics

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High-power and widely tunable continuous-wave optical parametric oscillators (cw OPOs), as mature radiation sources in the mid-infrared range, are limited by their frequency fluctuation. We built a cw OPO working at the near- and mid-infrared ranges and discuss the extent to which its frequency stability is affected by the mechanical temperature and the air pressure of the cavity. In addition, we artificially provoked mode hops by changing the above two factors to analyze the thermal-induced refractive index variation of the crystal. An inequality between the spacing of the hops and the free spectrum range (FSR) was observed. The wavelength stability of the cw OPO was guaranteed passively, and the longest mode-hopping-free time exceeded 13 h through sealing the cavity and thermal control. Further analysis of factors affecting frequency drift is critically essential for the reliability of cw OPO, particularly in environments outside the laboratory, and may provide a new method for high-precision tuning wavelengths.

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Amplification of CW Single-Frequency Lasers

Yang

et al. 2019

Single-Frequency Fiber Lasers

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Modelling of thermal effects within a 2-μm pumped ZGP optical parametric oscillator operating in the mid-infrared

Cited by 4 publications

References 7 publications

Studies of optical loss in ZGP OPO devices for near- to mid-infrared conversion

Studies of optical loss in ZGP OPO devices for near- to mid-infrared conversion

A Passively Wavelength-Stabilized Mid-Infrared Optical Parametric Oscillator

Amplification of CW Single-Frequency Lasers

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