Optics

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Questions related to Optics

What is difference between optical and thermal concentration?

What is basic difference between optical and thermal concentration and what are the applications where optical or thermal concentration are used? 

01 October 2017 4,011 5 View

Why should we measure the optical rotation by polarimeter within 30min. after preparation of sample?

Is there any chance of formation of other isomers.please clarify.

28 September 2017 391 2 View

Hyperopic eye with posterior scleral staphyloma, is it possible?

We all known that Posterior staphylomas are more commonly congenital (at birth) or as a manifestation of more extreme myopia (nearsightedness). The congenital staphylomas occur near the optic disc...

27 September 2017 7,243 6 View

Optical limiting effect?

Dear Colleagues, I'm studying the optical limiting effect in organic material due to reverse saturation absorption. As we know, in reverse saturation absorption, the transmission coefficient...

23 September 2017 1,139 4 View

How is that when an input of 1V is provided to Photonic crystal based splitter gives an output voltage greater than input (Output as 1.2 V)?

After designing an optical splitter using photonic crystals with four equal and symmetric ports using ring resonator, I am getting output to be greater than input voltage provided (output is the...

21 September 2017 5,966 8 View

Rings in self-defocusing effect ?

Dear Colleagues, I'm studying self-defocusing effect in organic material. In the light beam on the screen, I observe the rings like attached images. Is this the result of diffraction? What is the...

21 September 2017 6,197 18 View

Is there a camera that can simulate the human eye in terms of field of view, f# and focal length?

I know that the human eye is a complex system but I would like to know if there are or if is it possible to create a camera which can simulate the human eye in terms of focusing the objects and...

20 September 2017 8,709 4 View

How the optical property will modify based on penn energy?

For single crystal

19 September 2017 1,741 1 View

How to make small FOV collimator?

I have a sensor and I want to make really small FOV, like 0.1 degree.So, I use lens, which focus light into pinhole. So FOV is Tan(D/f)^-1, where D is pinhole size, f is focal length. It means, If...

19 September 2017 3,982 3 View

Direction of vector P and vector E in isotropic and anisotropic medium?

Dear Colleagues, From relation:  P=ε_0 χ^((1)) E I suppose that in an isotropic medium,  χ^((1)) is the scalar quantity, vector P and E are in the same direction, while for an anisotropic medium,...

18 September 2017 5,077 4 View

Nonlinear part in refractive index?

Dear Colleagues, I am studying a third order nonlinear optical organic material with a negative nonlinear refractive index, but the total refractive index is positive (n=n0+n2I, n2

18 September 2017 4,502 2 View

I need to know how to polish the tip of a fiber optic with a diameter of 1000 microns?

When I cut the optical fiber, due to the large diameter of the fiber, cracks are formed on the surface.By polishing the fiber, the fiber surface becomes angular.This phenomenon greatly affects the...

13 September 2017 9,483 2 View

Any limitations of optical ring resonators?

Dear colleagues, I have a biological background and know a bit principles of work of optical ring resonators. However, I wonder whether this nice methodology has any limitations. For example, how...

06 September 2017 852 3 View

Does anybody know anything about the optical properties of phospholipids?

I need this information, because of I want to study what the role of phospholipids were, or rather, vesicles of phospholipids in the primeval earth so they were undergone to an intense UV-C...

02 September 2017 7,146 3 View

How to calculate optical properties using time-dependent Hartree–Fock calculations (TDHF) based on the HSE06 calculations in VASP?

Can someone tell me the procedure to calculate the dielectric functions by including the excitonic effects using time-dependent Hartree–Fock calculations (TDHF) based on the HSE06 calculations in...

22 August 2017 3,016 2 View

Is it possible to couple a white light (lamp) into waveguide/optical fibre? how?

I want to excite a fabry perot filter with a white light. But the filter height is around 10-20 microns. Is it possible to couple a white light into the filter through optical fibre or a waveguide?

21 August 2017 9,786 15 View

What are the carrer options after completing ph.d in photonics( optical communications) from iit?

hill, Currently I am doing ph.d in photonics, specifically in optical communications. Will anyone please suggest me the carrer options after completion of my degree.

18 August 2017 3,668 2 View

What is the simplest method to lock DFB-LD with 5MHz linewidth to scanning fabry perot etalon resonance negative slope?

PDH is one method what are other options to achieve stable locking of of DFB-LD to scanning fabry perot etalon with FSR=1.5GHz and 3-dB BW=7.5MHz. I want to lock DFB-LD to FPE negative...

17 August 2017 3,733 1 View

Resultant spot size of a combined beam?

If two or more beams are overlapped or combined at a point in space, what will be the resultant spot size at the point of combination?

17 August 2017 9,117 2 View

How we can calculate the Q-factor for an Optical M-QAM-OFDM signal in DDO-OFDM or CO-OFDM ?

Q-factor= 20*log10(sqrt(2)*(erfcinv(2*(BER)))); I have searched a lot but unfortunately I only found the equation above that calculate the Q from BER ,but the Q will be infinity when the BER is 0....

15 August 2017 257 3 View

How can I get the values of tb,td(beam and diffuse optical depths)ab,and ad(beam and diffuse air mass exponents) according to latitude and longitude ?

According to ASHRAE the values of tb and td for Atlantic, I want their values according to cities or latitude and longitude  Thanks 

04 August 2017 5,411 4 View

Can thermal radiation be concentrated?

It is obvious that solar radiation can be concentrated using any optical concentrator such as lenses or parabolic mirrors. This is possible because  the solar rays are parallel as they are coming...

19 July 2017 9,778 3 View

What kind of OEM detectors, sources and FPGA's could I use to build a new DCS system? What kind of cost, size reduction considerations are possible?

I am reading about the Diffuse Correlation Spectroscopy for non-invasive, micro-vascular cerebral blood flow measurament.The device used for the topic is a combination of DCS+NIRS/DOS. The system...

12 July 2017 5,665 4 View

Can anyone please explain what are the Resonant and Non-resonant optical nonlinearities.

Required little help to explain Resonant (leading to Kerr, Kerr-quintic nonlinearities) and nonresonant (leading to the transitions in quantum levels) optical nonlinearities.

11 July 2017 8,599 2 View

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