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The Center for Lasers and Photonics (CELP) is an interdisciplinary center of excellence that combines cutting-edge technology from engineering and theoretical advances in science to create new horizons in the field of photonics science and engineering. The faculty in CELP belong to six different parent departments (EE, ME, AE, PHY, CY, and CE) and pursue research in the fields of nanobiophotonics, ultrafast optics, quantum optics and related fields. The Center has research infrastructure worth several crores funded by agencies such as DST, DRDO, CSIR, MHRD etc.

Prof. Pradeep Kumar K

Head, Centre for Lasers and Photonics
Phone:0512-259-7570
Email: head_ltp@iitk.ac.in / pradeepk@iitk.ac.in

Some of the prominent contributions to technology development by CELP faculty are listed below:

EPI Pressure sensors
Cervical cancer detection
Fiber optic devices
Enhanced light collection in solar cell using patterned surface
Cavity-coupled guided resonances in photonic crystal heterostructures
Dynamical bistability through loss modulation in fiber laser
Measuring temporal coherence of broadband laser
Characterizing silicon photonic crystal slab with out-of-plane light coupling
Generation of ultraviolet light using standard single mode fiber
Stokes-Mueller study of polarized light in photonic crystal
Metasurface-based triple-band antenna
Imaging of inhomogeneities within highly scattering media
Phototherapy units for treatment of Neonatal Jaundice using dual wavelength exposure
Vein visualization aid for intravenous interventions
Optical real-time label free detection of Bilirubin levels in Neonates
UV sterilization chamber using the ideas of chaos in Bunimovich stadium geometry for uniform distribution of radiation
Computational fluorescence optical and photoacoustic tomography and Electrical impedance tomography: Data acquisition system and reconstruction algorithms.
Large-bandwidth chaos in optical fibers: Demonstrated chaos of 12.5 GHz single-sided bandwidth in erbium-doped fiber laser. This is the largest bandwidth of chaos reported till date in fiber-lasers.
High-speed random number generator: Using chaos in erbium-doped fiber ring lasers, demonstrated random number generator with potential generation rate of 400 Gbps/single-mode of polarization. Patent granted
Trench-Assisted Fiber for FTTH Applications: Developed a novel fiber with refractive index profile that is insensitive to bend induced losses. Patent granted. Presently exploring options for technology transfer.
Developed Quantum Key Distribution hardware including single-photon detector module at 1550 nm, 2.4 GHz RF transmitter and receivers, and OFDM based QKD systems.
High speed and robust fringe analysis method for interferogram processing
Non-invasive multi-component precision metrology instrument
Non-contact nanoscale surface topography instrument
A thin film based flat optical device for beam shaping
A reconstructive spectrometer
Greater than 100Gbps Highly Efficient Waveguide Photodiodes Monolithically Integrated with waveguide taper for Optical Fiber coupling at 1550 nm wavelength

Pulsed Nd: YAG Laser (Quanta Ray Pro-Series)
The Quanta-Ray Pro-Series pulsed Nd: YAG laser comprises a laser head with Beam Lock and power supply. Control is provided via windows-based software or an optical table top analog controller. This laser offers a variety of pulse frequency and wavelength options.

Specifications:
Laser wavelengths: 1064 nm and 532 nm; Rep rate: 10 Hz; Pulse width: 10 nsec; Energy (@1064nm): 325 mJ/pulse; Energy (@532nm): 120 mJ/pulse; Beam diameter: < 10mm;
Activities: Optical waveguide characterization (Departmental)
Optofluidic dye laser characterization (Departmental)
Synthesis of carbon nano-tubes (External)
Pulsed Nd: YAG Laser (Quanta Ray INDI)
Quanta-Ray INDI series laser is designed for users who do not require a high end pulsed Nd: YAG laser. The system comprises following components:
- Laser head
- Power supply unit
- Table top controller
- CIM-INDI computer interface
- Push button switch option for single shot operation
Specifications: Model: INDI 40; Rep-rate: 10 Hz; Energy (@1064nm): 450 mJ; Energy (@532nm): 200 mJ
Energy (@355 nm): 100 mJ; Energy (@266nm): 55 mJ; Pulse Width: 5-8 nsec; Divergence: 0.5 mrad;
Beam Diameter: <10mm; Energy stability: 2%;
Mode-locked Nd: YAG laser (QUANTEL YG900)
The QUANTEL YG 980 series combines an Nd: YAG oscillator with up to two amplifiers, and features up to 2.5 J of pulse energy, excellent beam quality and high stability.

Specifications:
Temperature stabilized bench, Fast photodiode for pulse visualization, Automatic harmonic selection Linewidth: 0.003 cm^-1 with SLM option, Temperature controlled harmonic generators with motorized tuning provide the user wavelength modularity. Narrow linewidth options, including Single Longitudinal Mode (SLM) operation, as well as higher repetition rates are available to meet application requirements.
Principal radiations: 1064nm, 532 nm, and 355 nm
Max Energy per pulse: 420mJ (1064nm); 80mJ (532nm); 30mJ (355nm)
Pulse width: 35 psec
Laser ablation chamber with turbo molecular vacuum pump

Specifications:
Laser ablation chamber:
Material: SS 304, ID: 350mm
Height: 300mm; thickness: 3mm;
No of ports available suitable for many experiments

Turbo Pump:

Make: Pfeiffer Vacuum GMBH Turbo Cube Model 521
Connection dia: DN160 CF-F; Pumping speed for N2: 5000lps;
Backing Pump: DUO 5 (Pumping speed: 5 m³/h);
Splinter ShieldDN 160;
Compact Full Range Gauge model PKR251

Beam parameter of He-Ne Laser
Objective: To calculate beam parameters of He-Ne laser using: a) Knife edge method, and b) Intensity profile measurement
Diode Laser characteristics
Objective: To measure a) V-I and L-I characteristics of the diode laser, b) Far-field pattern of the laser diode by recording the angular variance/dependence of the radiation; and its variation with distance and power level. This is to be done in two cases: a plane perpendicular and parallel to the junction plane, and c) Spectrum of the diode laser.
Electro-optic effect in a Lithium Niobate Crystal and Magneto-optic effect in a Terbium doped glass rod
Objective: a) To study the electro-optic effect in a Lithium Niobate crystal, b) To measure the half wave voltage. (c) To calculate the Verdet constant of a Terbium doped glass rod, b) To observe change in Verdet constant of Terbium doped glass rod w.r.t wavelength
Studies on polarization: Experiment and Simulation using FRED software
Objective: a) To check the polarisation of laser source, b) To verify Malus law, c) To characterize the functionality of HWP, d) Generate circular and elliptical polarized light using QWP
Mach-Zehnder Interferometry
Objective: Interferogram of a heated plate using Mach-Zehnder interferometer
Acousto- Optic modulator
Objective: a) To observe the diffraction pattern using acousto-optic modulator for two wavelengths, b) To measure the diffraction efficiencies corresponding to different RF powers, c) To calculate diffraction angle with respect to the acoustic frequencies.
Fresnel and Fraunhofer Diffraction
Objectives: a) To measure intensity distribution along the axis of the circular aperture and compare it with the calculated distribution using the concept of Fresnel zones, b) To measure irradiance in the far field Fraunhofer zone in the transverse plane, for a slit and compare it with theoretical results, c) To measure irradiance in the far field Fraunhofer zone in the transverse plane, for a circular aperture and compare it with theoretical results.
Nd: YAG laser and 2nd harmonic generation
Objective: a) To align the Nd: YAG laser, observe the lasing wavelength (1064 nm) and hence to find the threshold pump power, b) To produce second harmonics in the existing set up by using the given KTP Crystal, c) observe frequency doubled radiation (532 nm) and find the power conversion efficiency.
Diffraction grating characterization and Fabry-Pérot Interferometry
Objective: a) To find the ruling density (grooves/mm) of the given grating, b) To find the deviation as a function of wavelength for 1st order diffraction at different incident angle, c) To find the Littrow condition and then the blazing angle, d) To find the relative efficiency as a function of wavelength, (d) Use Fabry-Perot interferometer to determine transmittance curve and finesse for different laser sources
Measurement of temporal coherence of different light source using Michelson interferometer
Objective: To calculate temporal coherence using Michelson Interferometer of a) He-Ne laser of λ = 632.8 nm, b) Solid state Laser of λ = 655 nm, c) Diode Laser of λ = 635 nm
Alignment, acquisition, processing and reconstruction of holograms
Objective: a) To create the transmission holograms of 3D object using He-Ne laser, b) To create the transmission holograms of diffraction grating using He-Ne laser and measure the grating efficiency.
Characterization of optical fibre and Demonstration of Optical Fiber kit “Light Runner Basic”
Objective: a) Optical Fiber Coupling Loss for single mode, b) Bending loss in Single mode optical fiber, c) To determine NA of single mode optical fiber at two different positions, d) To determine Misalignment loss for single mode optical fiber, I. Longitudinal misalignment, II. Transverse misalignment, III. Angular misalignment, e) Using Optical Fiber kit “Light Runner Basic”, measure the Attenuation, Dispersion & Eye Pattern in an optical fiber and determine the position of the fault in a fiber optic link using OTDR Method.

PSE Workshop at IITK houses the modern facilities such as CNC lathe machine and conventional machines like milling, drilling, cutting etc. It provides support to the department faculties and research scholars for designing the various research apparatus as well as making the standard specimens.

Departmental Postgraduate Committee (DPGC) Convener

Dr. Shilpi Gupta

Associate Professor

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+91-512-6796231
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News & Announcement

Candidates Shortlisted for Interview in PhD Programme ^New
Candidates Shortlisted for Interview in M.S (By Research) Programme ^New
PG Admissions 2024-25 1st Semester interview date ^New
Candidate selected for Ph.D programme 2023-2024
Candidate selected for M.Tech programme 2023-2024
Candidate selected for M.S(By Research) programme 2023-2024
Nitish Kumar Gupta selected for Outstanding PhD Thesis Award (2023) from PSE
List of candidates are selected for admission to the Ph.D
List of candidates are selected for admission to the M.S ( By Research)
List of candidates shortlisted for interview in M.S. By Research (MSR) programme
List of candidates shortlisted for interview in PhD programme
PG Admissions 2022-23 2nd Semester
Central Manufacturing Technology Institute(CMTI), Bangalore and IIT Kanpur signed a MoU on the 4th July 2022 to undertake collaborative research in Laser Technology, Photonics and Advanced Manufacturing Technology.
The center welcomes the participation of post-doctoral fellows in research activities.

Prof Shilpi Gupta has been awarded with P.K Kelkar Fellowship from the Institute.
Prof Pratik Sen has been awarded with Poonam and Prabhu Goel Chair Professorship.

About Us

Head of Department

Prof. Pradeep Kumar K

Departmental Postgraduate Committee (DPGC) Convener

Dr. Shilpi Gupta

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