Interferometric output coupling of ring optical oscillators (original) (raw)
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Optimum output coupling in optical oscillators using an antiresonant ring interferometer
We describe a simple and universal method for absolute optimization of output power from optical oscillators using interferometry. By incorporating an antiresonant ring interferometer in one arm of the oscillator cavity, simple adjustments to the interferometer provide continuously variable output coupling over a broad spectral range and under any operating conditions. We demonstrate the technique using a femtosecond optical parametric oscillator (OPO), where we show continuously adjustable output coupling from 1% to 60%. By operating the OPO under an optimized output coupling of ~30%, we obtain ~200 mW of extracted power, more than twice that with an ~4% conventional output coupler, across the full tuning range. We also show that the technique has no detrimental effect on the spatiotemporal characteristics of the output, with the extracted signal exhibiting a Gaussian beam profile and near-transform-limited pulse durations.
Comparative Analysis of Optical Ring Resonators with Cross- and Direct-Coupled Configurations
This paper presents a proposed alternate configuration for optical ring resonator (ORR) having a resonance loop made of single-mode optical fiber. Under steady state condition, the responses of the proposed ORR are formulated by considering the output and loop intensities for various conditions of transmission coefficient, power coupling coefficient, and compared the results with the previous reported ORR configuration. The analyses have shown that the main difference between two ORRs is due to the values of power coupling coefficients of the couplers used in their configurations. Another major point, that is to be considered in design of ORR for a maximum output power is that the transmission coefficient and power coupling coefficient in the proposed configuration are not required to be equal, as the case of the previously reported configuration. The analytical results given in this article can be useful for selection of ORR configuration for particular applications, specially in case of nonlinear use of ORR configuration.
Optics express, 2012
We report herein the enhancement in both power and efficiency performance of a continuous-wave intra-cavity singly resonant optical parametric oscillator (ICSRO) by introducing finite resonant wave output coupling. While coupling out the resonant wave to useful output, the output coupling increases the SRO threshold properly thus suppresses the back-conversion under high pump power. Therefore, the down-conversion efficiency is maintained under high pump without having to raise the threshold by defocusing. With a T = 9.6% signal wave output coupler used, the SRO threshold is 2.46 W and the down-conversion efficiency is 72.9% under the maximum pump power of 21.4 W. 1.43 W idler power at 3.66 μm and 5.03 W signal power at 1.5 μm are obtained, corresponding to a total extraction efficiency of 30.2%. The resonant wave out coupling significantly levels up the upper limit for the power range where the ICSRO exhibits high efficiency, without impeding its advantage of low threshold.
All-optical wavelength conversion in an integrated ring resonator
2010
We present the first system penalty measurements for all-optical wavelength conversion in an integrated ring resonator. We achieve wavelength conversion over a range of 27.7nm in the C-band at 2.5 Gb/s by exploiting four wave mixing in a CMOS compatible, high index glass ring resonator at ~22 dBm average pump power, obtaining < 0.3 dB system penalty.
Optics Letters, 2000
The resonator length of an optical parametric oscillator (OPO) is normally made a short as possible to minimize the signal-buildup time and maximize the output energy. We have found that, when a doubly resonant OPO is pumped by a multilongitudinal-mode beam, its output energy has a significant maximum when its optical length matches that of the pump source, even if this length is much greater than the shortest possible for the OPO. We have observed this effect in a ZnGeP 2-based OPO and reproduced it in numerical simulations.
Journal of Nonlinear Optical Physics & Materials, 2017
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 efficiency 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 efficiency for the signal. For a given pump intensity, we have analyzed the effect 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 efficiency for the idler (in mid-IR region). The magnitude of absorption and the effect of intercrystal phase shift on the conversion efficiency 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 t...
Transient analysis of a nonlinear ring resonator operating as an optical oscillator
Microwave and Optical Technology Letters, 1996
Campus Universitario s / n 36200 Vigo Spain KEY TERMS Fiber r~~. s o n a~~r s . ~ionlineu~ oprics, optical oscillators. optical signal prow~sing ABSTRACT I n r1ii.s Lerter u'e srirdy /tie rransienr hehai,ior. of a notilinear iwo-coupler fiber-ring resorio~or operaring as im optical oscillaior. The shape of die pi1w.s genrratetl atid the speed in [lie e.sruhlishtneni of osci1lririori.s are itrr~esri~~~ted.
Applied Physics B, 2009
We demonstrate that for a given pump source, there is an optimum pump threshold to achieve the maximum single-frequency output power in singly resonant optical parametric oscillators. Therefore, cavity losses and parametric amplification have to be adjusted. In particular, continuous-wave output powers of 1.5 W were achieved with a 2.5 cm lithium niobate crystal in comparison with 0.5 W by a 5 cm long crystal within the same cavity design. This counter-intuitive result of weaker amplification leading to larger powers can be explained using a model from L.B. Kreuzer (Proc. Joint Conf. Lasers and Opt.-Elect., p. 52, 1969). Kreuzer also states that single-mode operation is possible only up to pump powers which are 4.6 times the threshold value. Additionally, implementing an outcoupling mirror to increase losses, single-frequency waves with powers of 3 W at 3.2 μm and 7 W at 1.5 μm could be generated simultaneously.