Fiber Optic Scope Source

Optic Device

Number of Photons?

The human eye is a complex sensing device for visible light. The optic nerve needs a minimum of 2.0*10^-17 J of energy to trigger a series of impulses that eventually reach the brain.

(a) How many photons of red light (660 nm) are needed?

(b) How many photons of blue light (475 nm) are needed?

Please remember the formula between the energy and frequency or wavelength:
E = hν = hc/λ
where E the energy in J, h the Plank constant 6.626x10^-34 J•s, ν the frequency in 1/s or Hz, c the speed of light 2.998x10^8 m/s, and λ the wavelength in m (1 nm = 10^-9 m). Therefore one-photon energy of 660nm light is:
E = hc/λ = (6.626x10^-34 J•s)*(2.998x10^8 m/s)/(660x10^-9 m)
= 3.01x10^-19 J
Please complete the solution to (a) and continue with the same approach on (b).

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Setting A Bragg Angle on an IntraAction Corp. Acousto Optic Device

sending signals digitally?

I intend to control an underwater ROV via fiber optic cable. Is there a device that exists that can accept a single PWM input, convert it to speed control instructions, and output those as PWM to speed controls?

Also, I need a way to convert either instructions on a laptop or a joystick setup to PWM.

probably could just use a generic microcontroller and use a fast loop to keep quickly checking the state of a PWM signal %on/%off to get a duty cycle, seems like a bad way of doing things though, would be easier just to send serial data from the laptop to a microcontroller in the ROV