I The detection of the carrier-envelope offset frequency (fCEO) of optical signal

I
Thread starter Lithium_Niobate_Dog
Start date Jul 16, 2024

AI Thread Summary

The discussion centers on the relationship between the repetition rate (frep) of an optical frequency comb (OFC) and the phase noise of the carrier-envelope offset frequency (fCEO). It posits that if noise sources are identical, the phase noise of frep increases with its absolute value. Consequently, the inquiry is whether the phase noise of fCEO, detected via an f-2f interferometer, also escalates as frep increases. The conclusion drawn is that as frep rises, the noise transmitted to fCEO is likely to increase as well. This highlights the interconnectedness of phase noise and repetition rate in optical signal detection.

Jul 16, 2024

Lithium_Niobate_Dog

TL;DR Summary: When detecting fCEO using an f-2f interferometer, does the phase noise transmitted to the detected fCEO become relatively larger as the value of frep increases?

Assuming the noise sources are exactly the same, the phase noise of the repetition rate (frep) of an optical frequency comb (OFC) increases as the absolute value of frep increases. In this case, can we assume that the phase noise of the fCEO detected using an f-2f interferometer also increases relatively as the absolute value of the OFC's frep increases?
In other words, is it correct to say that as frep increases, the amount of noise transmitted to fCEO also increases?

Thread 'A quartet of epi-illumination methods'

Well, it took almost 20 years (!!!), but I finally obtained a set of epi-phase microscope objectives (Zeiss). The principles of epi-phase contrast is nearly identical to transillumination phase contrast, but the phase ring is a 1/8 wave retarder rather than a 1/4 wave retarder (because with epi-illumination, the light passes through the ring twice). This method was popular only for a very short period of time before epi-DIC (differential interference contrast) became widely available. So...

View full post »

Thread 'Effective absorption coefficient of gold nanoparticles'

I am currently undertaking a research internship where I am modelling the heating of silicon wafers with a 515 nm femtosecond laser. In order to increase the absorption of the laser into the oxide layer on top of the wafer it was suggested we use gold nanoparticles. I was tasked with modelling the optical properties of a 5nm gold nanoparticle, in particular the absorption cross section, using COMSOL Multiphysics. My model seems to be getting correct values for the absorption coefficient and...

View full post »