Electromagnetically induced transparency and Autler-Towns effect in multi-level cascade type system in 133Cs Suman Mondal, Amitava Bandyopadhyay Physica Scripta, 2023 The probe field propagation through a twelve-level Ξ type atomic system, having two ground energy levels, four intermediate energy levels and six upper energy levels, is studied theoretically in presence of a control field connected from intermediate energy levels to upper energy levels of the 6 S 1 / 2 → 6 P 3 / 2 → 6 D 5 / 2 transitions of 133Cs atom. Optical Bloch equations (OBEs) for the system are derived by density matrix formalism and are solved numerically under Doppler free and Doppler broadened conditions. The control field can simultaneously remain resonant or nearly resonant with certain hyperfine transitions and highly detuned with respect to other transitions. Under Doppler free condition the probe absorption curve shows multiple electromagnetically induced transparency peaks (EIT) formed within largely separated Autler-Towns (A-T) peaks. The A-T peaks are formed due to the dressing of the hyperfine transitions coupled by a highly detuned control field. The EIT windows get widened with increase in the Rabi frequency of the control field. The numerical result is compared with analytically solved reduced three-level Ξ type system. At room temperature the multiple transparency peaks get masked due to thermal averaging and an overall transparency like feature appears in the simulated Doppler broadened probe absorption curve.
Controlling optical bistability, multistability and all-optical switching through multi-photon excitation process Suman Garain, Suman Mondal, Kalan Mal, Subhasish Roy, Amitava Bandyopadhyay Journal of Physics B Atomic Molecular and Optical Physics, 2023 We present a theoretical study on optical bistability (OB), optical multistability (OM) and tunable all-optical switching in a four-level cascade type atomic system. The density matrix formalism is used to find out the response of the probe laser field. We explore OB and OM under unidirectional optical ring cavity configuration. A comparison between the effects of electromagnetically induced transparency and electromagnetically induced absorption windows on OB is presented. The threshold of OB and the hysteresis width can be tuned effectively by adjusting the applied coherent fields. A transition from OB to OM and vice-versa can be easily achieved by tuning the field parameters and the atomic cooperation parameter. Dynamic control of the probe laser propagating through the medium has been investigated. We also demonstrate conversion of a continuous wave input probe field into output switched pulse. The ON/OFF time of the switched probe pulse can also be controlled by tuning the field parameters.
Simple high-precision diode laser system with digital control Suman Garain, Amitava Bandyopadhyay, Dipankar Bhattacharyya, Suman Mondal, Subhasish Roy Applied Optics, 2023 A simple wavelength tunable diode laser system has been designed and fabricated for laboratory use. Both the current and temperature controllers are based on an AVR microcontroller, and the experimental controls have been implemented with the help of daemon programs running in a message passing interface environment, which allows the users to run the control server and client programs on separate computers. The stability of the controllers has been tested using a distributed feedback (DFB) diode laser with a central wavelength of 852.3 nm. A noise spectral analysis of the current controller with and without the use of the diode laser as the active load has been demonstrated. The absorption spectra of 6 S 1 / 2 → 6 P 3 / 2 transition of 133 C s , as recorded by using the DFB laser system developed, are also presented.
Atom localization in cascade type system Kalan Mal, Suman Mondal, Dipankar Bhattacharyya, Amitava Bandyopadhyay Journal of Physics Conference Series, 2020 A three-level cascade type system is subjected to a standing wave (SW) field acting between the ground energy level and the intermediate energy level of the system and the probe field scans the uppermost energy level from the intermediate energy level. Optical Bloch equations (OBE) for this three-level system are derived from the Liouville equation (Master equation) where the decay terms are added phenomenologically. These OBEs are solved analytically under steady state condition by using weak probe approximation. Under doppler free condition precession of localization was controlled by tuning the SW rabi frequency and relative orientation of the applied fields.
Electromagnetically induced transparency in Y-type atomic system Kalan Mal, Khairul Islam, Suman Mondal, Dipankar Bhattacharyya, Amitava Bandyopadhyay Journal of Physics Conference Series, 2020 Probe field propagation through a four-level Y-type system is studied analytically under steady state condition by using density matrix formulation. The probe field scans the intermediate state from the ground state whereas two other coherent radiation fields, namely the control field and the coupling field, are set to couple two different excited states from the intermediate energy level. Under Doppler free condition, simulated probe absorption shows single or twin EIT windows depending on whether the control and the coupling field are on-resonant or detuned. Under Doppler broadened condition, the residual Doppler averaging due to wavelength mismatch between the probe field and the control field as well as that between the probe field and the coupling field plays significant role in the formation of transparency window.
Vacuum-induced electromagnetically induced grating in a cascade-type atomic system within an optical cavity G Islam, S Mondal, A Bandyopadhyay Optics Communications, 132785 , 2025 2025
Controlling optical multistability and all-optical switching in a four level Y -type atomic system S Garain, S Goldar, S Roy, A Bandyopadhyay Indian Journal of Physics 98 (9), 3095-3105 , 2024 2024
Electromagnetically induced transparency and Autler-Towns effect in multi-level cascade type system in 133Cs S Mondal, A Bandyopadhyay Physica Scripta 98 (11), 115508 , 2023 2023 Citations: 2
Controlling optical bistability, multistability and all-optical switching through multi-photon excitation process S Garain, S Mondal, K Mal, S Roy, A Bandyopadhyay Journal of Physics B: Atomic, Molecular and Optical Physics 56 (18), 185401 , 2023 2023 Citations: 4
Simple high-precision diode laser system with digital control S Garain, A Bandyopadhyay, D Bhattacharyya, S Mondal, S Roy Applied Optics 62 (4), 956-963 , 2023 2023 Citations: 1
Electromagnetically induced transparency, narrow absorption and transient response in a three-photon excitation process S Mondal, D Das, P Dey, D Bhattacharyya, A Bandyopadhyay Optik 265, 169410 , 2022 2022 Citations: 3
Microwave assisted gain in inverted-Y type atomic system S Mondal, K Mal, D Bhattacharyya, N Pal, A Bandyopadhyay Optik 226, 165962 , 2021 2021 Citations: 3
Atom localization in cascade type system K Mal, S Mondal, D Bhattacharyya, A Bandyopadhyay Journal of Physics: Conference Series 1579 (1), 012013 , 2020 2020
Electromagnetically induced transparency in Y-type atomic system K Mal, K Islam, S Mondal, D Bhattacharyya, A Bandyopadhyay Journal of Physics: Conference Series 1579 (1), 012002 , 2020 2020
Electromagnetically induced transparency and electromagnetically induced absorption in Y-type system K Mal, K Islam, S Mondal, D Bhattacharyya, A Bandyopadhyay Chinese Physics B 29 (5), 054211 , 2020 2020 Citations: 8
Formation of electromagnetically induced transparency and two-photon absorption in close and open multi-level ladder systems AB Suman Mondal, Sushree Subhadarshinee Sahoo, Ashok Kumar Mohapatra Optics Communications 472, 126036 , 2020 2020 Citations: 10
Atom localization in cascade type system A Bandyopadhyay, K Mal, S Mondal IOP Publishing , 2020 2020
Electromagnetically induced transparency in Y-type atomic system A Bandyopadhyay, K Mal, S Mondal, K Islam IOP Publishing , 2020 2020
Optical switching phenomenon in ladder type atomic system under varying wavelength mismatching effect with one due to a Rydberg transition S Mondal, A Ghosh, K Islam, A Bandyopadhyay Optics Communications 435, 378-384 , 2019 2019 Citations: 8
Electromagnetically induced transparency in a six-level inverted-Y type atomic system using Rydberg state A Bandyopadhyay, A Ghosh, S Mondal, K Islam AIP Publishing. , 2019 2019
Wavelength mismatching effects on susceptibility and optical switching in an inverted-Y type atomic system A Bandyopadhyay, S Mondal, A Ghosh, K Islam AIP Publishing. , 2019 2019
Electromagnetically induced transparency in a six-level inverted-Y type atomic system using Rydberg state A Ghosh, S Mondal, K Islam, A Bandyopadhyay AIP Conference Proceedings 2072 (1), 020002 , 2019 2019 Citations: 1
Wavelength mismatching effects on susceptibility and optical switching in an inverted-Y type atomic system S Mondal, A Ghosh, K Islam, D Bhattacharyya, A Bandyopadhyay AIP Conference Proceedings 2072 (1), 020017 , 2019 2019
An optical narrowband switch between subluminal and superluminal light propagation in the inverted-Y configuration AB Suman Mondal, Arindam Ghosh, Khairul Islam Laser Physics 29 (7), 075204 , 2019 2019 Citations: 8
Effect of residual Doppler averaging on the probe absorption in cascade type system: A comparative study S Mondal, A Ghosh, K Islam, D Bhattacharyya, A Bandyopadhyay Chinese Physics B 27 (9), 094204 , 2018 2018 Citations: 8
MOST CITED SCHOLAR PUBLICATIONS
A simple scanning semiconductor diode laser source and its application in wavelength modulation spectroscopy around 825nm A Ray, A Bandyopadhyay, S De, B Ray, PN Ghosh Optics & Laser Technology 39 (2), 359-367 , 2007 2007 Citations: 33
Line-shape study of water vapour by tunable diode laser spectrometer in the 822-832 nm wavelength region A Ray, A Bandyopadhyay, B Ray, D Biswas, PN Ghosh Applied Physics B 79 (7), 915-921 , 2004 2004 Citations: 26
Observation of electromagnetically induced transparency in six-level Rb atoms and theoretical simulation of the observed spectra D Bhattacharyya, A Ghosh, A Bandyopadhyay, S Saha, S De Journal of Physics B: Atomic, Molecular and Optical Physics 48 (17), 175503 , 2015 2015 Citations: 19
Revisiting the four-level inverted-Y system under both Doppler-free and Doppler-broadened conditions: an analytical approach A Ghosh, K Islam, D Bhattacharyya, A Bandyopadhyay Journal of Physics B: Atomic, Molecular and Optical Physics 49 (19), 195401 , 2016 2016 Citations: 16
Velocity dependent pump-probe spectroscopy for a five-level system: an application to Rb D2 transitions D Bhattacharyya, A Bandyopadhyay, S Chakrabarti, B Ray, PN Ghosh Chemical physics letters 440 (1-3), 24-30 , 2007 2007 Citations: 16
Diode laser spectroscopic measurements and theoretical calculations of line parameters of nitrogen-broadened water vapor overtone transitions in the 818–834nm wavelength region A Bandyopadhyay, B Ray, PN Ghosh, DL Niles, RR Gamache Journal of Molecular Spectroscopy 242 (1), 10-16 , 2007 2007 Citations: 16
A study on electromagnetically induced transparency and velocity selective optically pumped absorption in an eight-level inverted Y-type atomic system A Ghosh, K Islam, S Mondal, D Bhattacharyya, N Pal, A Bandyopadhyay Journal of Physics B: Atomic, Molecular and Optical Physics 51 (14), 145501 , 2018 2018 Citations: 13
Velocity-selective resonance dips in the probe absorption spectra of Rb D2 transitions induced by a pump laser S Chakrabarti, A Pradhan, A Bandyopadhyay, A Ray, B Ray, N Kar, ... Chemical physics letters 399 (1-3), 120-124 , 2004 2004 Citations: 12
Splitting of electromagnetically induced absorption signal in a five-level v-type atomic system K Islam, A Bandyopadhyay, BC Das, S Saha, S De, D Bhattacharyya Journal of the Optical Society of America B 34 (12), 2550-2557 , 2017 2017 Citations: 11
Formation of electromagnetically induced transparency and two-photon absorption in close and open multi-level ladder systems AB Suman Mondal, Sushree Subhadarshinee Sahoo, Ashok Kumar Mohapatra Optics Communications 472, 126036 , 2020 2020 Citations: 10
Study on probe field propagation in the presence of control and coupling fields through a four-level N-type atomic system K Islam, D Bhattacharyya, A Ghosh, D Biswas, A Bandyopadhyay Journal of Physics B: Atomic, Molecular and Optical Physics 50 (21), 215401 , 2017 2017 Citations: 10
Lineshape study of argon broadened water vapour overtone transitions in the 818–834 nm wavelength region A Bandyopadhyay, A Ray, B Ray, PN Ghosh Journal of Molecular Spectroscopy 234 (1), 93-98 , 2005 2005 Citations: 9
Electromagnetically induced transparency and electromagnetically induced absorption in Y-type system K Mal, K Islam, S Mondal, D Bhattacharyya, A Bandyopadhyay Chinese Physics B 29 (5), 054211 , 2020 2020 Citations: 8
Optical switching phenomenon in ladder type atomic system under varying wavelength mismatching effect with one due to a Rydberg transition S Mondal, A Ghosh, K Islam, A Bandyopadhyay Optics Communications 435, 378-384 , 2019 2019 Citations: 8
An optical narrowband switch between subluminal and superluminal light propagation in the inverted-Y configuration AB Suman Mondal, Arindam Ghosh, Khairul Islam Laser Physics 29 (7), 075204 , 2019 2019 Citations: 8
Effect of residual Doppler averaging on the probe absorption in cascade type system: A comparative study S Mondal, A Ghosh, K Islam, D Bhattacharyya, A Bandyopadhyay Chinese Physics B 27 (9), 094204 , 2018 2018 Citations: 8
Measurement and analysis of rotational lines in the (2ν1+ ν2+ ν3) overtone band of H2O perturbed by CO2 using near infrared diode laser spectroscopy P Poddar, A Bandyopadhyay, D Biswas, B Ray, PN Ghosh Chemical Physics Letters 469 (1-3), 52-56 , 2009 2009 Citations: 7
Frequency stabilisation of a GaAlAs semiconductor diode laser to an absorption line of water vapour at 822 nm A Ray, A Bandyopadhyay, B Ray, PN Ghosh IEE Proceedings Optoelectronics 151 (6), 490-495 , 2004 2004 Citations: 7
On line shape measurement and simulation of rovibrational transitions of water vapour in the near infrared region A Bandyopadhyay, A Ray, B Ray, PN Ghosh Chemical physics letters 401 (1-3), 135-139 , 2005 2005 Citations: 6
Controlling optical bistability, multistability and all-optical switching through multi-photon excitation process S Garain, S Mondal, K Mal, S Roy, A Bandyopadhyay Journal of Physics B: Atomic, Molecular and Optical Physics 56 (18), 185401 , 2023 2023 Citations: 4