This document discusses solid state lasers. It begins by explaining what a laser is and how it produces light through stimulated emission. It then describes the common components of all lasers including the active medium, excitation mechanism, and high reflectance mirrors. Solid state lasers use a crystalline or glass host material doped with ions like neodymium or ytterbium as the active medium. Examples given are ruby and Nd:YAG lasers. Solid state lasers have advantages like simple construction and lower cost compared to gas lasers, though their output power is not as high. Applications include drilling metals, endoscopy, and military targeting systems.
This belongs to Physical Chemistry portion and it contains most of
things about laser working and principles.
By Aaryan Tyagi's Group
M.Sc. Applied Chemistry (1 Sem)
Amity University, Noida
Basic operating principle and instrumentation of photo-luminescence technique. Brief description about interpretation of a photo-luminescence spectrum. Applications, advantages and disadvantages of photo-luminescence.
This belongs to Physical Chemistry portion and it contains most of
things about laser working and principles.
By Aaryan Tyagi's Group
M.Sc. Applied Chemistry (1 Sem)
Amity University, Noida
Basic operating principle and instrumentation of photo-luminescence technique. Brief description about interpretation of a photo-luminescence spectrum. Applications, advantages and disadvantages of photo-luminescence.
(A) By active media
Solid state laser - crystal, or glass, doped with impurities, e.g. ruby laser, Ti:sapphire laser, semiconductor laser.
Gas laser - e.g. He-Ne laser, Ar+ laser, CO2 laser, N2 laser, HCN laser.
Dye laser - active medium: dye molecules in liquid solvent (sometimes in solids also).
(B) By mode of operation
CW
Pulsed
(C) By pumping and laser levels
3-level laser
4-level laser
(A) By active media
Solid state laser - crystal, or glass, doped with impurities, e.g. ruby laser, Ti:sapphire laser, semiconductor laser.
Gas laser - e.g. He-Ne laser, Ar+ laser, CO2 laser, N2 laser, HCN laser.
Dye laser - active medium: dye molecules in liquid solvent (sometimes in solids also).
(B) By mode of operation
CW
Pulsed
(C) By pumping and laser levels
3-level laser
4-level laser
This article briefs on the commonly used different types of lasers, their working principle, applications, advantages and disadvantages. The types of lasers discussed in this section are
Nd-YAG Laser, Ruby Laser, Carbon Dioxide Laser, Semiconductor Laser, He-Ne Laser.
In the world ,we see that 2 type of laser are present ,we can point with the help of laser and we can cut the metal ,but we cannot "push" ,we can develop great thing with this concept
Light Amplification by Stimulated Emission of Radiation. Its basic principle of working, features or characteristics, types, applications, hazards caused by LASER and future scopes.
Lasers in dentistry1/ orthodontic course by indian dental academyIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Lasers in dentistry/ orthodontic course by indian dental academyIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
2. LASER
The acronym laser stands for "light
amplification by stimulated emission of
radiation.“
A laser is a coherent and focused beam
of photons; coherent, in this context, means
that it is all one wavelength, unlike ordinary
light which showers on us in many
wavelengths.
3. HOW IS LASER PRODUCED?
Light is emitted in the form of tiny package called
‘quanta’/photon.
Each photon has a characteristic frequency and
its energy is proportional to its frequency.
Three basic ways for photons and atoms to
interact:
Absorption .
Spontaneous Emission .
Stimulated Emission.
4. COMMON COMPONENTS OF
ALL LASERS.
Active Medium -
The active medium may be solid crystals such as ruby or Nd:YAG,
liquid dyes, gases like CO2 or Helium/Neon, or semiconductors
such as GaAs. Active mediums contain atoms whose electrons may
be excited to a metastable energy level by an energy source.
Excitation Mechanism -
Excitation mechanisms pump energy into the active medium by one
or more of three basic methods; optical, electrical or chemical.
High Reflectance Mirror-
A mirror which reflects essentially 100% of the laser Partially
Transmissive Mirror
A mirror which reflects less than 100% of the laser light and
transmits the remainder.
5. Characteristics & application
Laser radiation has five striking characteristics each of them opens up
interesting opportunities in spectroscopy, giving rise to ‘laser spectroscopy’.
6.
7. SOLID STATE LASER
A solid-state laser is a laser that uses a gain
medium that is a solid, rather than
a liquid such as in dye lasers or a gas as
in gas lasers.
Semiconductor-based lasers are also in the
solid state, but are generally considered as a
separate class from solid-state lasers .
8. The active medium of a solid-state laser consists of
a glass or crystalline "host" material to which is added a "dopant"
[ neodymium, chromium, erbium ,thulium or ytterbium]
Many of the common dopants are rare earth elements, because the
excited states of such ions are not strongly coupled with the thermal
vibrations of their crystal lattices (phonons), and their operational
thresholds can be reached at relatively low intensities of laser
pumping
9. CONSTRUCTION
A laser is constructed from three principal
parts:
An energy source (usually referred to as
the pump or pump source),
A gain medium or laser medium, and
Two or more mirrors that form an optical
resonator.
10.
11. PUMP SOURCE
1. The pump source is the part that provides
energy to the laser system.
2. Examples of pump sources include electrical
discharges, flashlamps, arc lamps, light from
another laser, chemical reactions and even
explosive devices.
3. The type of pump source used principally
depends on the gain medium, and this also
determines how the energy is transmitted to the
medium.
12. GAIN MEDIUM
1. The gain medium is the major determining factor of the
wavelength of operation, and other properties, of the laser.
2. Gain media in different materials have linear spectra or wide
spectra.
3. Gain media with wide spectra allow tuning of the laser
frequency.
4. The gain medium is excited by the pump source to produce
a population inversion, and it is in the gain medium that
spontaneous and stimulated emission of photons takes place,
leading to the phenomenon of optical gain, or amplification.
13. OPTICAL RESONATOR
1. The optical resonator, or optical cavity, in its simplest form is two parallel
mirrors placed around the gain medium which provide feedback of the light.
2. The mirrors are given optical coatings which determine their reflective
properties.
3. Typically one will be a high reflector, and the other will be a partial reflector.
4. The latter is called the output coupler, because it allows some of the light to
leave the cavity to produce the laser's output beam.
5. Some lasers do not use an optical cavity, but instead rely on very high optical
gain to produce significant amplified spontaneous emission(ASE) without
needing feedback of the light back into the gain medium , Such lasers are said
to be superluminescent, and emit light with low coherence but high bandwidth.
14. Solid state lasers
Ruby laser.
The first laser, one that is still
used.
Ruby is synthetic aluminum
oxide, Al2O3, with 0.03 to
0.05% of chromium oxide,
Cr2O3, added to it. The Cr3+
ions are the active ingredient;
the aluminum and oxygen
atoms are inert.
Pumping is by light from a
xenon flash tube.
15. Solid state lasers •
Neodymium: YAG laser. •
The active ingredient is
trivalent neodymium, Nd3
added to an yttrium
aluminum garnet, YAG,
Y3Al5O12.
The Nd-YAG laser has a
vary high radiant power
outpt at 1064nm.
16. ADVANTAGES AND DISADVANTAGES.
ADVANTAGES
1. No chance is of wasting material in the active
medium because here material used is in the form
of solid.
2. construction of solid state laser is
comparatively simple.
3. cost of solid state laser is economical.
DISADVANTAGES
1. output power is not very high as in CO2 laser.
2. efficiency of solid state laser is less compared
to CO2 laser.
17. APPLICATIONS
Nd:YAG solid state lasers are usually used
when drilling holes in metals.
Nd:YAG pulsed type solid state lasers can
be used in medical applications such as
endoscopy.
As military applications, Nd:YAG is used to
target destination system.