Advanced Technocracy Inc.
Grain Market, Ambala, Haryana
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Various Type of Inteferometers and C.D.S

Offering you a complete choice of products which include michelson interferometer based, sodium light complete unit, helium-neon laser with stand, diode laser with power supply (red colour), michelson interferometer and fabry perot interferometer.

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Michelson Interferometer based on Model developed by Hilger & Watts (London)It is divided into two parts.
(1) Mechanical (2) Optical Mechanical part consists of following items
a) Bed: Bed is optically ground, Length 250mm
b) Lead Screw: Lead screw is optically ground with its nut, length 200 mm Pitch 1 mm
c) Optical Mirror Mount: Kinematic mirror mounts are to hold the mirror which be aligned in to orthogonal direction by means of screws provided at the rare of the mount.
Optical Parts consist of the following items:
a) Beam Splitter
b) Compensating plate
Size 45mm× 32mm × 8mm 50mm× 35mm × 8mm
Beam splitter and compensating plates are covered from the same optically worked glass plate

Surface flatness :λ/10 (both faces)
Parallelism  :5 arc sec.
Mirrors    :2Nos.
Focal Length     :25mm thickness 10mm
Front surface :Coating material : 
Coated AI with SiO2
L.C. of Instrument    :10¯4mm
 
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Generally this light source is used for above Michelson Interferometer. Supplied with sodium vapour lamp transformer 35 W, sodium vapour lamp 35W & heavy metal box for sodium vapour lamp with electrical fitting.
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Imported Laser tubes along with SMPS Power Supply are housed in thick powdered coated aluminium box . From the hole the laser beam comes out. Supplied with rectangular holder & heavy base.

Size
a 1mW (random)
b  2mW (random)
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A compact, fully solid state instrument produces an intense beam of light at a wavelength 635-670nm for red colour. This semiconductor diode laser is mounted in a simple mount. Supplied completely with power supply. Output power 3 - 5 mW
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Michelson Interferometer (Bread Board Model) - Coherent Length of the Laser
Diode laser source typically emits two or three frequencies. If the beam consists of two frequencies, each of these frequency makes an independent interference pattern. In the event that the two mirrors are precisely equal in distance from the beam splitter, the fringe pattern will be the same regardless of the frequency. In the path lengths are not equal, there will be a case of anti-coincidence where the bright line from one set of fringes in located at the dark line of the other. This results in complete disappearance or low contrast in the observed pattern.
List of instruments supplied in this kit
• Optical breadboard
• 5mW diode laser with power supply
• Kinematic laser mount
• Beam splitter with mount
• Mirror mount with micrometer translation  stage
• Mirror mount with precision translation stage
• Cell holder with detector
• Detector photo transistor
• Output measurement unit (Range 1mA - 200mA)
Salient Features :
A detector is used to record the contrast variation at the fringe pattern.
All components used are of research quality and made from laboratory grade material for long life without corrosion. The components are assembled on a breadboard and protected from dust and airflow by a transparent cover.
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Michelson Interferometer (Bread Board Model) (To find Refractive index of gas/air)
Same as [Michelson Interferometer (Bread Board Model) - Coherent Length of the Laser]but we can also study the change of refractive index of air with change in pressure & determine the refractive index of air.
It consists of list of items as per  [Michelson Interferometer(Bread Board Model) - Coherent Length of the Laser]in addition to this it also consists of compressor, pressure chamber, valve & pedestal air pump etc.
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This Model is mounted on a heavy iron base. It is most suitable for Educational Institution. Various Components are made from high precision machines, mounted on the aluminium base and the complete interferometer is mounted on a heavy cast iron base.
It consists of beam splitter and compensator Plates mounted in an aluminium housing. It is fitted on the aluminium base at 45° to two reflecting mirrors. All flat optics used have flatness of at least l/4 and are protected with a layer of silicon Monoxide coating.
Least Count 0.01mm. It also consist of reading telescope of magnification 3x, fitted with Ramsden eyepiece & cross line graticule. 20x objective with mount is also supplied with interferometer (in case of work with He-Ne Laser or Diode Laser).
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It is specially useful for accurate measurements, comparison of wavelengths and examination of hyperfine structure of spectral lines. It is also used for measuring wavelength changes by application of magnetic field.
It consist of a partially coated mirror mounted in an alumminium housing. This module is placed in front of the moving mirror to set up the Fabry Perot Interferometer. Two adjustable screws are provided for making the two etalons parallel.
In built Telescope has a magnification of 3x and is fitted with a Ramsden eyepiece & a cross line graticule.
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In Fabry-Perot interferometer, the distance between partially reflecting mirrors are varied by using coarse and fine translation stage driven by micrometers. One beam splitter is fixed and the other is mounted on the translation stage through a kinematic mount. The two axes kinematic mount is used to correct the parallelism between beam splitters.
Translation stages are fitted with micrometers for both coarse and fine movements in order to get precision measurements. All components and modules are mounted on rail and carriage system for easy adjustments. The optics and mechanics assembly is made out of corrosion free materials.
List of instruments supplied in this kit
• Optical rail.
• Diode Laser with Power supply
• Kinematic Laser mount with rail carriage
• Fabry-Perot Interferometer with rail carriage
• Lens with mount and rail carriage
• Translucent screen with rail carriage
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The Sagnac effect manifests itself in an experiments setup called ring interferometry. A beam of light splits and the two beams are made to follow a trajectory in opposite directions. To act as ring, the trajectory must enclose an area. On return to the point of entry, the light is allowed exit to the apparatus in such a way that an interference pattern is obtained. The arrangement for Sagnac interferometer is as shown in the figure.
Sagnac interferometer employs modular in design and construction. Mirrors beam splitters and lasers along with mechanical mountings are supplied as individual modules which can be assembled on honeycomb breadboard.
The device consists of 800 mm x 600 mm honeycomb breadboard with a rigid and vibration resistant base for assembling the interferometer. Mirrors and beam splitters are held in precision kinematic mounts for fine alignments. Laser head is also held in a kinematic mount for fine tuning the direction of the laser beam.
Students gain hands on experience in optical instruments assembly by setting up the interferometer.
Sagnac effect is employed in current technology. One of the use is in inertial guidance system. Ring interferometers are extremely sensitive to rotations. In the Sagnac configuration, the position of the interference fringes is dependent on angular velocity of the setup. This dependence is caused by the rotation, effectively shortening the path length of one beam, while lengthening the other.
List of instruments supplied in this kit
• Optical breadboard
• 5mW Diode Laser with Power supply
• Kinematic Laser mount with carriage
• Metallic beam splitter with kinematic mount
• Front coated mirror with kinematic mount
• Convex lens with mount Optical breadboard
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For measurement of refractive index of liquids & gases. The interference fringes are magnified in the instrument to over 100times by means of a cylindrical lens of the eye-piece which provides horizontal magnification. The fringes produced are sharp at the normal distance of distinct vision.
It consists of following items :-
a) Heavy metal platform
b) Collimator with circular slit is fixed at one end.
c) Telescope with cylindrical lens instead of Ramsden eyepiece is fitted on other side of the table.
d) One metal box which is fitted in the front of the telescope consist of Razor Glass Plate inclined at an angle of 45 deg. This box also contains compensation plates. The whole system is connected to micrometer screw gauge to record the readings.
e) Plane parallel optical glass cells for liquids.
f) Pair of gas cells with plane parallel windows for the measurement of refractive index of gases.
g) Vacuum pump single stage having displacement of 32 liters per minute with manometer.
Supplied without sodium Lamp Unit.
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This design concept followed in this device is similar to Sagnac interferometer. The device is assembled using modular building blocks on a rigid base. A honeycomb anti- vibration breadboard of size 800mm x 600mm is supplied as the base. Mirrors, beam splitter and diode laser along with their mounts are supplied as modular building blocks.
Interferometer is built by assembling the building blocks on the breadboard as per the desired optical layout. Optics and laser head are held using kinematic mounts with two axes fine adjustment for obtaining the interference fringes are done using kinematic mounts.
One of the simplest experiments using the Mach-Zehnder interferometer is measurement of the index of refraction of air with an airtight test cell placed in one of its optical arms of the interferometer. No other factors such as convective airflow should be present which can generate optical path differences.
The flexibility in fringe localization gives Mach-Zehnder interferometer one of the important advantage over other interferometers. Although many Mach - Zehnder interferometers use a rectangular arrangement, the parallelogram arrangements are also possible.
List of instruments supplied in this kit• Optical breadboard
• 5mW diode laser with power supply
• Kinematic laser mount
• Metallic beam splitter with kinematic mount
• Front coated mirror with kinematic mount
• Gas cell with accessories
• Convex lens with mount
• Screen
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Speckle Pattern Interferometry (SPI) determines the difference between two small deformation states of the same inspected object. Speckle-pattern-ineterferometry shows a fringe pattern, which can be interpreted as contour lines of the same state of deformation. The distance between two fringes corresponds to half the laser wavelength. Therefore SPI allows sensitive and non-contact detection of defects.
This instrument has been developed by ISRO Satellite center, Bangalore for NDT applications with Hollmarc Company. It makes use of speckle pattern interferometry along with CCD imaging techniques and image processing software for studying the static and dynamic conditions of the test objects. Hollmarc company has a technology transfer agreement with ISRO Satellite center for manufacturing and marketing this system with the permission of Hollmarc Company we have given this equipment in our catalogue.
The unit consists of opto-mechanical and optical components similar to those used for holography, assembled on a breadboard. He-Ne laser is used as light source. Instead of holographic plates, CCD camera is used for recording fringes
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(a) Collimating Tube : (Material : Brass Pipe) O.D.: 50mm I.D. : 44mm for fitting collimating lens
It is provided with rack & pinion arrangement and slit.
Slit is of circular type.
The jaws of the slit are optically ground.
It is provided with Holfmann’s Diaphragm.
(b) Telescope Tube : (Material : Brass Pipe) O.D. : 50mm, I.D. : 44mm for fitting telescope lens
It is provided with rack & pinion arrangement for proper focussing of spectral lines.
Eyepiece ; (Ramsden Type) : magnification : 10x
In eyepiece holder a conical pointer is fitted in the focal plane of eyepiece
(c) Corrected achromatic doublet are fitted in the lens holders of collimator and telescope tube.
Doublet dia : 44mm, F.L. : 350mm (14").
The Collimator and telescope tubes are fitted in cast iron blocks which are mounted on a machined cast iron blocks which in turn are mounted on a machined cast iron plate.
(d) Suitable gap is provided between collimating lens and prism table to accommodate high resolving instrument like Fabry-Perot Etalon.
(e) Prism Table is fitted on the machined cast iron plate and actuated by tangent screw to provide smooth rotation of the C.D.S. prism placed on it.
(f) Prism table is covered with a box of a aluminium casting having two gates.
One gate allows light coming from collimator to enter into C.D.S. Prism
Another gate allows light to be collected by telescopic objective after light being dispersed from C.D.S. prism.
(g) A calibrated drum (Calibration for visible region i.e. from 4000A°- 7000A°) is attached with the prism table assembly. Accuracy of calibration + 5A°
(h) Machined cast iron plate with drum assembly is fitted over the head of a heavy cast iron base.
The base and machined cast iron plate are painted in a staple Grey colour.
Collimator, Telescope, Prism table, Drum assembly are painted black.
Total Weight : 20Kg.
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Material optically Glass R.I. either m = 1.717 or 1.78. Three faces of the prism are optically flat to surface finish l/10.
(While placing order please specify the refractive index of the CDS prism.)

Size
a µ = 1.717
b  µ = 1.78
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It is to take photographs of spectral lines. The quarter size camera is fitted in the place of telescope tube while taking photographs. The objective of the telescope is replaced by tele photo lens of the suitable focal length.
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To take the photographs of the spectral lines, we are supplying imported films. Pack of 25 films.
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The instrument is made in different sizes of spacers in silica. The mirrors are about 30 mm in dia & with clear aperture 25mm but other sizes can be manufactured if required by the customer specially. Both optically plane Glass plates are coated 50% each. Space between them is 3mm. It is used either with Mercury or Sodium Light.
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Specifications are same as  (Fabry-Perot Etalon) but optically Glass plates are coated in the ratio 80% & 20% to be used with He-Ne Lasers.
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Mounted in a housing and provided with means for production of different types of fringes. The clear space for fringes is about 30mms and the plates are heavily aluminised for increasing the resolving power of the instrument, employed for calibrating spectrometer
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Condensing Lens with mount and stand.



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This Power Supply is specially designed to spark the brass / copper / iron rods. It is a D.C. Power Supply of 70V, 10A with Built-in variable transformer, bridge rectifier & dimmerstat.
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This stand holds either brass rods or copper rods or iron rods. When we use this stand with above power supply, we can observe either brass / copper/iron spectrum. Supplied with one pair of iron rods, copper rods and brass rods.
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Special Micrometer eyepiece to be used with CDS.



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Attachment to convert CDS into Monochromator.



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(a) For Direct measurements upto 50mm in steps of 0.01mm (0.001cm) on a large micrometer head
(b) The reading microscope screw & drum head, and the stage are carried on a sturdy base so that these are normally inclined at an angle of 45 degree. The stage 7.5 x 15cm is fitted with spring clips.
(c) The micrometers slide moves along a lifeline stainless steel scale and the movements are read directly on a largely drum head to 0.01mm (or 0.001cm through a vernier attached to it). The micrometer screw & nut are specially aged & normalised to ensure uniformly accurate performance with passage of time. Total range of movement 50mms.
(d) The reading microscope is provided with rack and pinion focussing. Optics highly achromatic.
(e) An extra support leg is attached to the base to enable the whole instrument to be brought to a horizontal reading position.
(f) Substage mirror in gimbals for reflecting light.
(g)Complete in a wooden case.
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Advanced Technocracy Inc.

Kunal Chopra (CEO)
ATICO House, 5309 Grain Market, Near B. D. Senior Secondary School Aticoindia@gmail.com
Ambala - 133001
Haryana, India
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