Prof. Harith Bin Ahmad Profile

Prof. Harith Bin Ahmad

Professor at Univ of Malaya

SPIE Involvement:

Author

Publications (19)

Proceedings Article | 12 March 2024 Poster + Paper

Poster + Paper

Laser remote sensor for oil palm fruit ripeness assessment

Kok-Sing Lim, Batrisyia Ahmad Nazri, Wan Rusydiah Rusik, Amirul Al Hafiz Abdul Hamid, Cheong-Weng Ooi, Waldo Udos, Mohd Shiraz Aris, Mohd Zulfahmi Mohd Yusof, Harikrishna Kulaveerasingam, Wu-Yi Chong, Mohammad Faizal Ismail, Harith Ahmad

Proceedings Volume 12879, 128790I (2024) https://doi.org/10.1117/12.3014258

KEYWORDS: Sensors, Reflection, Matrices, Visual inspection, Spectroscopy, Visualization, Reflectivity, Visible radiation, RGB color model, Photodetectors

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SPIE Journal Paper | 2 August 2023

Optical fiber Bragg grating-based pressure sensor for soil monitoring applications

Muhammad Syamil Mohd Sa’ad, Harith Ahmad, Mohamad Ashraff Alias, Muhammad Khairol Annuar Zaini, Muhamad Zharif Samion, Kenneth T. Grattan, B. M. Azizur Rahman, Gilberto Brambilla, Kok Sing Lim, Sulaiman Harun, Leonard Bayang, Siti Aisyah Reduan, Kavintheran Thambiratnam, Mohd Zamani Zulkifli, Mohammad Faizal Ismail

OE, Vol. 62, Issue 08, 086101, (August 2023) https://doi.org/10.1117/12.10.1117/1.OE.62.8.086101

KEYWORDS: Fiber Bragg gratings, Sensors, Actuators, Soil science, Temperature metrology, Optical fibers, Design and modelling, Bragg wavelengths, Optical engineering, Environmental monitoring

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SPIE Journal Paper | 4 August 2022

Thulium/holmium fiber laser with Ti₂AlN MAX phase-coated arc-shaped fiber for mode-locked pulse generation

Harith Ahmad, Neshat Sadafi, Norazriena Yusoff, Muhamad Zharif Samion, Mohammad Faizal Ismail, Wu Yi Chong

JNP, Vol. 16, Issue 03, 036006, (August 2022) https://doi.org/10.1117/12.10.1117/1.JNP.16.036006

KEYWORDS: Mode locking, Aluminum nitride, Titanium, Fiber lasers, Signal to noise ratio, Raman spectroscopy, Picosecond phenomena, Absorption, Polishing, Dispersion

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SPIE Journal Paper | 14 March 2022

Temperature-independent vibration sensor based on Fabry–Perot interferometer using a fiber Bragg grating approach

Muhammad Syamil Mohd Sa'ad, Mohammad Faizal Ismail, Muhammad Khairol Annuar Zaini, Kenneth T. Grattan, B. M. Azizur Rahman, Gilberto Brambilla, Lim Kok Sing, Harith Ahmad

OE, Vol. 61, Issue 03, 037101, (March 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.3.037101

KEYWORDS: Sensors, Fiber Bragg gratings, Temperature metrology, Signal detection, Interferometers, Seaborgium, Optical engineering, Fiber optics sensors, Calibration, Vibrometry

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SPIE Journal Paper | 21 May 2020

Q-switched tunable ytterbium-doped fiber laser with molybdenum ditelluride-based saturable absorber

Harith Bin Ahmad, Nor Najwa Ismail, Siti Nabila Aidit, Leonard Bayang, Norazriena Yusoff

OE, Vol. 59, Issue 05, 056110, (May 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.5.056110

KEYWORDS: Fiber lasers, Molybdenum, Q switched lasers, Q switching, Modulation, Q switches, Optical engineering, Laser resonators, Pulsed laser operation, Signal to noise ratio

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SPIE Journal Paper | 13 May 2020

Surface ablation of poly allyl diglycol carbonate polymer using high-repetition-rate femtosecond laser

Kok Bin Ng, Jingwen Chew, Wu Yi Chong, Chin Seong Lim, Harith Bin Ahmad

OE, Vol. 59, Issue 05, 057102, (May 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.5.057102

KEYWORDS: Laser ablation, Femtosecond phenomena, Polymers, Carbonates, Polymethylmethacrylate, Laser irradiation, Laser processing, Scanning electron microscopy, Pulsed laser operation, Optical engineering

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SPIE Journal Paper | 22 April 2019

Multiwavelength operation in praseodymium fiber laser using polarization maintaining fiber and nonlinear polarization rotation in ring cavity

Harith Bin Ahmad, Mahmoud H. M. Ahmed

OE, Vol. 58, Issue 04, 046107, (April 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.4.046107

KEYWORDS: Fiber lasers, Polarization, Praseodymium, Birefringence, Polarization maintaining fibers, Optical filters, Nonlinear filtering, Wavelength division multiplexing, Laser resonators, Tunable filters

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SPIE Journal Paper | 23 May 2018

Highly stable mode-locked fiber laser with graphene oxide-coated side-polished D-shaped fiber saturable absorber

Harith Bin Ahmad, Soroush Soltani, Kavintheran Thambiratnam, Mohammad Yasin

OE, Vol. 57, Issue 05, 056110, (May 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.5.056110

KEYWORDS: Mode locking, Fiber lasers, Nanoparticles, Polishing, Graphene, Absorption, Picosecond phenomena, Pulsed laser operation, Laser resonators, Optical engineering

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SPIE Journal Paper | 22 May 2017

Passive mode-locking at S-band by single-mode thulium-doped fluoride fiber using a thin film PtAg/N-G saturable absorber

Harith Bin Ahmad, Mojgan Tajdidzadeh, Majid Rezayi, Iraj Sadegh Amiri Ahmed

JNP, Vol. 11, Issue 02, 026008, (May 2017) https://doi.org/10.1117/12.10.1117/1.JNP.11.026008

KEYWORDS: Mode locking, S band, Thin films, Fiber lasers, Platinum, Silver, Saturable absorption, Ultrafast phenomena, Solitons, Nanocomposites

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Proceedings Article | 11 November 2016 Paper

Paper

Black phosphorus as a saturable absorber for generating mode-locked fiber laser in normal dispersion regime

A. A. Latiff, M. F. Rusdi, M. B. Hisyam, H. Ahmad, S. W. Harun

Proceedings Volume 10150, 101500U (2016) https://doi.org/10.1117/12.2243416

KEYWORDS: Mode locking, Fiber lasers, Phosphorus, Dispersion, Photonics, Pulsed laser operation, Graphene, Laser applications, Lithium, Absorption

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SPIE Journal Paper | 25 July 2016

Generation of mode-locked erbium-doped fiber laser using MoSe₂ as saturable absorber

Harith Bin Ahmad, Siti Nabila Aidit, Nor Ahya Hassan, Mohd Faizal Ismail, Zian Cheak Tiu

OE, Vol. 55, Issue 07, 076115, (July 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.7.076115

KEYWORDS: Mode locking, Thin films, Fiber lasers, Signal to noise ratio, Liquids, Nonlinear optics, Chemical species, Absorption, Molybdenum, Raman spectroscopy

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SPIE Journal Paper | 16 February 2016

Highly stable and tunable narrow-spacing dual-wavelength ytterbium-doped fiber using a microfiber Mach–Zehnder interferometer

Harith Ahmad, Muhammad Aizi Mat Salim, Saaidal Azzuhri, Sulaiman Wadi Harun

OE, Vol. 55, Issue 02, 026114, (February 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.2.026114

KEYWORDS: Fiber lasers, Polarization, Tunable lasers, Optical fibers, Bandpass filters, Reliability, Fiber Bragg gratings, Cladding, Refractive index

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SPIE Journal Paper | 14 November 2014

Four-wave mixing analyses for future ultrafast wavelength conversion at 0.64 Tb/s in a semiconductor optical amplifier

Osayd Kharraz, Harith Ahmad, David Forsyth, Mohamad Dernaika, Abu Bakar Mohammad, Mohd Zamani Zulkifli, Mohd Faizal Ismail, Abu Sahmah B. Mohd Supa’at

OE, Vol. 53, Issue 11, 116111, (November 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.11.116111

KEYWORDS: Four wave mixing, Ultrafast phenomena, Modulation, Semiconductor optical amplifiers, Data conversion, Picosecond phenomena, Upconversion, Nonlinear optics, Optical engineering, Refractive index

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SPIE Journal Paper | 22 September 2014

All-incoherent wavelength conversion in highly nonlinear fiber using four-wave mixing

Osayd Kharraz, Harith Ahmad, David Forsyth, Mohamad Dernaika, Mohd Zamani Zulkifli, Mohd Faizal Ismail, Abu Bakar Mohammad

OE, Vol. 53, Issue 09, 096112, (September 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.9.096112

KEYWORDS: Fiber Bragg gratings, Dispersion, Polarization, Optical amplifiers, Four wave mixing, Nonlinear optics, Optical filters, Nonlinear filtering, Fiber amplifiers, Signal processing

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SPIE Journal Paper | 19 May 2014 Open Access

Open Access

Classification of reflected signals from cavitated tooth surfaces using an artificial intelligence technique incorporating a fiber optic displacement sensor

Husna Abdul Rahman, Sulaiman Wadi Harun, Hamzah Arof, Ninik Irawati, Ismail Musirin, Fatimah Ibrahim, Harith Ahmad

JBO, Vol. 19, Issue 05, 057009, (May 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.5.057009

KEYWORDS: Teeth, Fuzzy logic, Fiber optics sensors, Fiber optics, Sensors, Imaging systems, Signal processing, Feature extraction, Artificial intelligence, Neural networks

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Proceedings Article | 18 October 2012 Paper

Paper

Optical non-contact micrometer thickness measurement system for silica thick films

K. Thambiratnam, H. Ahmad, M. Yasin, A. Zulkifli, S. Harun

Proceedings Volume 8495, 84950Y (2012) https://doi.org/10.1117/12.929313

KEYWORDS: Sensors, Silica, Prisms, Semiconductor lasers, Planar waveguides, Optical sensors, Silicon, Photodiodes, Calibration, Modulation

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SPIE Journal Paper | 21 May 2012 Open Access

Open Access

Feasibility of fiber optic displacement sensor scanning system for imaging of dental cavity

Husna Abdel Rahman, Sulaiman Harun, Harith Ahmad, Adi Izhar Che Ani, Moh. Yasin, Retna Apsari

JBO, Vol. 17, Issue 7, 071308, (May 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.7.071308

KEYWORDS: Teeth, Imaging systems, Fiber optics sensors, Fiber optics, Sensors, Composite resins, Optical scanning systems, Dentistry, Modulation, Light sources

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Proceedings Article | 18 January 2011 Paper

Paper

Rigorous characterization of silicon nanowires and nanophotonic devices

B. M. A. Rahman, D. M. Leung, K. Namassivayane, T. Koshy, Z. Jiang, A. Law, H. Ahmed, K. Grattan

Proceedings Volume 7943, 79430H (2011) https://doi.org/10.1117/12.873067

KEYWORDS: Waveguides, Silicon, Silica, Dispersion, Cladding, Interfaces, Refractive index, Birefringence, Solids, Nanowires

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SPIE Journal Paper | 1 February 2001

Effects of signal seeding on long-wavelength-band Er3+-doped fiber amplifiers

Mohd Mahdi, F. Adikan, P. Poopalan, S. Selvakennedy, Harith Ahmad

OE, Vol. 40, Issue 02, (February 2001) https://doi.org/10.1117/12.10.1117/1.1336528

KEYWORDS: L band, Interference (communication), Energy transfer, Optical amplifiers, Fiber amplifiers, Absorption, Erbium, Signal attenuation, Amplifiers, Optical engineering

Showing 5 of 19 publications

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