Leader receives first dose of homegrown Iranian COVID-19 vaccine
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Paper Reports Ministry Ignored Warning On Domestic Vaccine Safety
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Iran should leave Vienna nuclear talks, say conservatives
The conservative Kayhan daily, whose editor-in-chief is directly appointed by Iran s supreme leader, urged Iran s negotiating team to immediately withdraw from ongoing talks in Vienna over Tehran and Washington s return to the 2015 nuclear deal. The US will not remove sanctions, so why is the Iranian team wasting its time in Vienna? Kayhan asked on its front page on Monday. The government and foreign ministry must leave the negotiations. They must announce that Iran s precondition for any new agreement is the permanent removal of all US sanctions at once, the daily added.
Vienna talks: Iran and US confirm progress in nuclear negotiationsRead More »
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New Insight into Nonlinear Optical Resonators Unlocks Door to Numerous Potential Applications
Optical resonators, which circulate and confine light (for instance in lasers), are currently used in a variety of applications of all sizes-from pinpoint light sources smaller than the width of a human hair to kilometer-scale sensing devices such as the Laser Interferometer Gravitational-wave Observatory (LIGO) experiment that detects gravitational waves.
Devices known as optical parametric oscillators are among the widely used nonlinear resonators in optics; they are “nonlinear” in that there is light flowing into the system and light leaking out, but not at the same wavelengths. Though these oscillators are useful in a variety of applications, including in quantum optics experiments, the physics that underpins how their output wavelength, or spectrum, behaves is not well understood.