INTRODUCTION

Advanced use of technology in the evolutionary journey of science is making human life easier and better. In this thesis project presentation I will describe the Ultrafast or short laser processing for advanced application. Many advanced uses of ultrafast lasers accelerate modern science.

Ultrafast or short wave laser advanced applications are semiconductor processing, PCB production, 5D eternal data storage writing in glass, display processing, holography, medical device manufacturing and optical data communication etc. Due to my work ethic and limitation of laboratory facility and time constraints I will try to present in this thesis project only as little paradigm as the ultra-fast laser processing in optical data communication.

Laser is an abbreviation of some physical phenomenon. L for Light, A for Amplification, by, S for Stimulated, E for Emission, of, R for Radiation. The Laser is a device for producing a very narrow beam of highly intensive monochromatic coherent light. Laser beams are single wavelength, single color, waves in same phase, travel in same direction, extremely intensive. There are three types of lasers Solid-state laser (Semiconductor laser), Gas laser, Liquid laser.

METHODOLOGY

“Ultrafast or short laser processing for advanced application” is an advanced scientific method that is now possible which is the result of the relentless efforts of many scientists. If we discuss ultrafast or short laser processing for particular optical data communication, then we need to emphasis on ultrashort laser production and transmission.

Laser is a continuous beam of monochromatic light which is a continuous wave and ultrashort or femtosecond laser is a one millionth of a billionth of a second pulses laser. Pulse compressor device used to control the spectral phase of an ultrashort pulse. Pulse compressor, composed of a sequence of prisms or gratings.

In this thesis project presentation, I will give more emphasis on electromagnetism and geomagnetism for advanced opportunities of data communication.

Discussion -

Near and mid infra ray show molecular vibration which is our main study area in case of ultrafast laser data communication.

Total internal reflection is the optical phenomenon complete reflection of a ray of light within a medium.

Coherence, a fixed relationship between the phase of waves in a beam of radiation of a single frequency. If two wave in a same phase with same amplitude is called constructive wave or bright fringe which intensity is very high so that les attenuation chance. [R-01]

The polarization of light affects the focus of laser beams, influences the cut off wavelengths of filters, and can be important to prevent unwanted back reflections. There are three types of polarization. Linear polarization. Circular polarization. Elliptical polarization. [R-02]

The intensity of laser light varies between maximum and minimum, but is not zero. This ensures that the light emerging from quarter wave plate is elliptically polarized. [R-03]

An analog to digital converter (ADC) takes an analog wave as an input and converts this wave to a digitally represented output form, which shown in figure. A digital to analog converter (DAC) essentially does the reverse, converting a digital representation into an analog form, which also shown in figure. [R-04]

Working principle of Laser are -

Stimulated Absorption, Spontaneous Emission, Stimulated Emission. Stimulated Absorption - In the starting point to achieve laser, the incident photon has stimulated the atom to absorb the energy.

If we excite electron by external energy. Light can push electrons. If a photon of light as single unit of light comes and cross a photon in a low energy state, then electron absorb energy and travel for exist 2nd high energy state. If 4 unit of light comes then photon travel for exist 5th energy state. If the photon in very high in energy the electron would be ionized to continue enroll energy as like ball in a hole push with high energy. This process is called stimulated absorption.

Spontaneous Emission -

If an atom is in an excited state, it may spontaneously decay into a lower energy level after some time, releasing energy in the form of a photon.

If we consider an excited electron in higher state, this higher state electron quite unstable and after a very short time approximates 100 nanoseconds the electron will return back lower state. We know light travels 29 meters in 100 nanoseconds. When electron falls in ground state it leaves Energy as like state difference range. If Frequency or Energy is in visible range, then we see it and observed its color. Also my another predict explanation is magnetic energy is involved in vacuum also and interact with electron to return its lower exist state. This process is called spontaneous emission. Because this electron falls down process is spontaneous.

Stimulated Emission –

A chain reaction in which the radiation from one atom stimulates another in succession.

When the photon interacts with electron which already executed, this photon act as a protonation for fall down in lower state emit two photons. The important facts are photon like to be together near a situation when an electron fall in a lower energy state. The emitted photon will be identical with same frequency, phase and polarization. They will be coherent each other. So if we arrange this process we will able to generate laser. So Laser is an identical coherent photon emission. On the other hand, if two electrons undergoes Spontaneous Emission but travel in same direction but not in a phase, these electrons are able to Stimulated Emission but not Spontaneous Emission.

Laser production Schematic Representation & Amplification

Stretcher used in order to cancel their corresponding scattering forces. A gain medium allow it to amplify laser beams by means of stimulated emission. A prism compressor is an optical device used to shorten the duration of a positively chirped ultrashort laser pulse by giving different wavelength components a different time delay. [R-05] [R-06] [R-08]

Fiber optic

Optical fibers use total internal reflection to transmit light. It has a solid core of dense glass surrounded by a less dense cladding. The light ray passing through the inner core is reflected back instead of being refracted to the rarer cladding. [R-07]

The electric field is produced by stationary charges, and the magnetic field by moving charges (currents); these two are often described as the sources of the field. Totally 'blocking' of a magnetic field is impossible. Although "MuMetal" widely used alloy for magnetic shielding purposes. composition of "MuMetal” are 80% nickel, 4.5% molybdenum and balance iron gives it highly permeable properties, but cost effectiveness is important.

So whether it is logical to improve optical data communication through shielding to fiber optic can be considered.

Geomagnetism

POSSIBLE OUTCOME BY APPLYING ULTRAFAST LASER IN FIBER OPTICS

Let's display attached JavaScript coded software or website index file and 23 graphics are 1.95 mb.

Coaxial cable transmission speed is 10Mbps (megabits per second), is more than 80 times more transmission capacity than twisted pair cables, Cat 7 - 10000 Mbps / 10 Gbps, Fiber-optic internet or a broadband connection can reach speeds of up to 940 Megabits per second (Mbps). Fiber-optic cable can send data as fast as about 70% the speed of light.

So that we should Emphasis, on ultrafast laser, for generate much higher speed than above mention signals.

CHAPTER-4: RESULT

Therefore, my proposal from the above analysis, If we explain our universe with the combined unit of space, time, and electromagnetism infinite three, then we do everything in the electromagnetic field. Electromagnetism depends on time and space, which we define by wavelength and time pulse.

Due to magnetic energy is involved in vacuum so considering vacuum magnetic energy we can process ultrafast or short wave laser which is more intense.

For optical data communication optical fiber is most important transmission medium. It travels longer distance of globe in the field of geomagnetism without magnetic shielding. So whether it is logical to improve optical data communication through shielding to fiber optic can be considered.

CHAPTER-5: CONCLUSION

According to scientist’s opinion we are able to look at the reactance, we are able to look at the product but we are not able to look transition state. Ultrashort pulses are generated when light waves with a large number of modes are coherently emitted through them in-phase superposition.

The broad energy bandwidth of ultrashort pulses is due to the uncertainty principle that arises from the inherent wave properties of photons where the precision of time energy is limited by the Fourier transform. Ultrafast Laser pulses requires the development of advanced optics and coating solutions.

According to scientist supervision the main challenges of Ultrafast Laser are Dispersion control, Laser damage and Reflectivity.

References

[R-01] A TEXTBOOK OF OPTICS BY N. SUBRAHMANYAM BRIJLAL

[R-02] https://www.britannica.com/science/light/Unpolarized-light

[R-03] Polarized Light, Second Edition by Dennis Goldstein.

[R-04] DIGITAL PRINCIPLES AND APPLICATIONS - Seventh Edition By Donald

P Leach & Albert Paul Malvino.

[R-05] Wikipedia

[R-06] https://www.researchgate.net/publication/225704433_Fiberlasers_for_ultrafast_optics

[R-07] Data Communications and Networking By Behrouz A.Forouzan.

CHAPTER-7, TRANSMISSION MEDIA, PAGE-198

[R-08] Raman Amplification in Fiber Optical Communication Systems By Clifford

Headley, Govind P. Agrawal, Page- 23,24

Thanks all of my Honorable examiners, teachers and beloved classmates.

Finally I would like to - Thanks all of my Honorable examiners, teachers and beloved classmates.