Dismas Choge

11 Questions 17 Answers 0 Followers

Questions related from Dismas Choge

Why does the effective laser beam radius vary from sample to sample while using Liu's method in estimation of Laser Induced Damage Threshold?

While using Liu's method to estimate the Laser Induced Damage Thresholds of optical mirrors, a plot of damaged area versus logarithm of pulse energies (Liu's plot)yields a linear relation. The...

10 April 2024 1,160 0 View

What is the effect of cascading a uniformly poled and step-chirped LN for SFG?

Uniformly poled nonlinear crystals are known to yield high conversion efficiency and narrow bandwidth while step-chirped structures have broad bandwidth but low conversion efficiency. Suppose a...

25 October 2017 6,012 0 View

How do I measure the splitting ratio of proton exchanged Y-junction waveguide?

I have a sample of Y-branch waveguides fabricated on lithium niobate substrate by annealed proton exchange (APE) process. I would like to measure the output power from each arm after coupling...

30 March 2017 2,065 5 View

How can i model negative corona discharge for a wire-to-plane geometry?

Dear all, I would like to study negative corona discharge for poling non linear optical crystals e.g Lithium Tantalate. I have however attempted to use plasma model example in COMSOL but i don't...

24 September 2016 4,621 3 View

What is the effect of channel waveguide width on 50:50 y-branch splitter?

I would like to understand the effect of varying waveguide width of a channel diffused waveguide on the splitting of optical power in terms of branching angle and length of the bend waveguide....

21 February 2016 9,648 4 View

How do i define diffusion parameters for APE waveguide simulation in Rsoft?

I am using Rsoft Beamprob CAD tool to simulate annealed proton exchange waveguide in MgO doped lithium niobate. However, I am having difficulty in defining diffusion parameters such as diffusion...

09 February 2016 1,046 2 View

How do I design a Y-junction using comsol multiphysics or matlab?

Y-branch waveguide structures are fundamental elements of integrated optics devices such as power or optical splitters, power or optical combiners, integrated-optic gyroscopes, Mach-Zehnder...

04 January 2016 8,818 4 View

What are the new potential applications of entangled photon pairs?

Entangled photon pairs generated via spontaneous parametric down conversion have had many applications such as quantum key distribution(QKD), quantum teleportation, in quantum relay chip,...

20 December 2015 1,718 2 View

Can photons generated via SPDC using pulsed pump source possess timing characteristics?

Following the fact that use of pulsed laser pump in the SPDC generates photons in bursts, does it imply the generated photons possess timing characteristics? If so, how can this be utilized? Any...

10 December 2015 4,015 2 View

Is it possible to generate indistinguishable photon pairs from two or more different sources using quantum frequency conversion?

A single photon state can be generated by pulsed excitation from an optical transition between two energy levels in a single quantum system such as QD. I am trying to find a way of generating...

17 November 2015 7,020 9 View

How do I simulate periodically Poled Lithium Niobate Reverse proton exchange waveguide before fabrication?

I am working on a project to simulate, fabricate and characterize PPLN waveguide by reverse proton exchange with an aim of achieving a more efficient waveguide for application possibly in...

30 September 2015 4,315 4 View