Any recommendations for large-sized photopic-like filter?

I'm looking for large sheets (~tens of cm) of a filter/material with transmission that resembles the photopic response of the human eye: it should block longer wavelengths than ~700 nm and shorter...

09 October 2018 2,233 0 View

Does IAD coating degrade over time compared to IBS coating?

31 December 2015 8,001 2 View

What is the origin of interference patterns generated by a laser diode?

Hi, I'm using a regular cheap low-power laser diode followed by a collimating lens and see several interference patterns on the laser spot (see attached pic). I know these patterns do not...

03 April 2015 4,148 13 View

What laser diodes are typically-used in DVD players?

06 July 2014 5,126 5 View

Can anyone recommend a commercially-available system for lens aberration measurements?

06 July 2014 2,165 7 View

Can anyone comment on cutting wave plates from birefringent bulk crystals?

The attached figure (taken from Optics\E. Hecht) shows a calcite bulk crystal in a cleavage form with a wave plate cut parallel to the optic axis. From the symmetry of the index ellipsoid there...

04 May 2014 1,358 7 View

How can I make stacked bar graph with scatter plot?

I want to make a stacked bar graph with showing each data value as dots. I tried with graph pad prism, version 6, but could not succeed. Does anyone have tried before making such graphs?

01 March 2021 9,383 1 View

How to Eliminate cosine error and abbe error in LASER measurement system(for example Rhenishaw XL80)?

I like to do project in laser measurement system. My objective is to eliminate or reduce the cosine error, abbe error in Laser measurement system. I have Rhenishaw XL80 system. Please tell the...

28 February 2021 4,890 3 View

How can we limit artifacts caused by rotation in fiber photometry?

We are trying to run fiber photometry experiments for long time scales, but we get these sinusoidal artifacts that come up. We think they may be caused by twisting of the fiber optic subject...

25 February 2021 568 1 View

How to measure angle between laser travel path and machine axis in Laser Measurement system?

25 February 2021 1,987 3 View

How can I simulate the optical absorption spectrum of a biomaterial (like DNA or protein) in COMSOL?

I need to simulate the optical properties of a biomaterial, namely DNA, in COMSOL. Basically I need to simulate the IR absorption spectrum of a cylinder filled with a 'concentration' of DNA. I am...

21 February 2021 3,043 3 View

What is the reason of the received optical signal to be slimmed down in multi-mode fiber?

What is the reason of the received optical signal to be slimmed down in multi-mode fiber? I have 4 km multi-mode fiber

03 February 2021 1,105 10 View

How to use multiple tables to generate a graph in Graphpad Prism?

I have two different tables: one for metabolic activity of the cells in a plate, the other one is the Total DNA assay from the same plate. I need to generate a graph which represents metabolic...

29 January 2021 3,294 5 View

Why it is not permissible to correct all 5 classical optical aberration (spherical, chromatic, coma, astigmatism, curvature of field) simultaneously?

When first order paraxial optics is expanded to third order optics (i.e. sin x~ x-x3/3! instead of sin x~x) , these 5 optical aberrations result in. What is the rigorous mathematical proof that,...

26 January 2021 8,666 4 View

Difference between Second-harmonic generation and Two-photon absorption?

Hello Dear Researchers, I am confused about the Difference between Second-harmonic generation and Two-photon absorption? Can anyone describe the two phenomena briefly in the physical picture? What...

24 January 2021 9,912 5 View

How could i explain the EC50 data utilized by graph Pad prism 9 ?

I measured the FARP antioxidant activity of plant extract than i used graph pad prism 9 to calculate the EC50, now i am not sure how to describe these data as i got the logECF and ECF .

17 January 2021 4,576 3 View