RESEARCH OPPORTUNITIES FOR GRADUATE STUDENTS FOR SPRING 2021

Currently, we have open positions for new graduate students in the following ongoing projects:

1) Laser investigation of novel nano particles for photo-thermal therapy and photo-dynamic therapy

2)Development of novel pulsed lasers for photo-acoustic tomography applications

3)Miniaturized waveguide lasers

Additional current research areas of my group  also include:

1) Investigation of nano-structured carbon based materials such as graphene and carbon nanotubes for femtosecond pulse generation from lasers

2)Development of new ceramic based lasers in the infrared spectral region

3)Thulium lasers operating in the mid infrared

4) Femtosecond pulse generation from mid-infrared thulium lasers

Some of our recent papers covering studies in the above research areas include:

1. Hashemkhani, K. Bilici, A. Muti, A. Sennaroglu, H. Y. Acar, “Multimodal image-guided folic acid targeted Ag-based quantum dots for the combination of selective methotrexate delivery and photothermal therapy,” Journal of Photochemistry and Photobiology B-Biology, 213, 112082 (2020).
2. B. Jalali, S. Sadeghi, I. Baylam, M. Han, C. W. Ow-Yang, A. Sennaroglu, and Sedat Nizamoglu “Exciton Recycling via InP Quantum Dot Funnels for Luminescent Solar Concentrators,” Nano Research, https://doi.org/10.1007/s12274-020-3207-9, ISSN 1998-0124 CN 11-5974/O4, (2020).
3. Kahraman, M. B. Vishlaghi, I. Baylam, H. Ogasawara, A. Sennaroglu, and S. Kaya, “The Fast-Track Water Oxidation Channel on BiVO₄ Opened by Nitrogen Treatment,” The Journal of Physical Chemistry Letters, in press (2020).
4. Bilici, N. Atac, A. Muti, I. Baylam, O. Dogan, A. Sennaroglu, F. Can and H. Yagci Acar, “Broad spectrum antibacterial photodynamic and photothermal therapy achieved with indocyaninegreen loaded SPIONs under near infraredirradiation,” Biomaterials Science, DOI: 10.1039/d0bm00821d (2020).
5. Sadeghi, H. B. Jalali, S. B. Srivastava, R. Melikov, I. Baylam, A. Sennaroglu, and S. Nizamoglu, “High-performance, large-area and ecofriendly luminescent solar concentrators Using Copper-doped InP Quantum Dots,” iScience, 23, 101272, https://doi.org/10.1016/j.isci.2020.101272, (2020).
6. Muti, I. Baylam, M. Tonelli, and A. Sennaroglu, “Tunable continuous-wave laser operation of Tm³⁺:BaY₂F₈ near 2.3 µm,” Opt. Lett., 45, 4104-4107 (2020).
7. Sennaroglu, G. Goodno, S. Mirov, J. Nilsson, A. Petersen, I. Sorokina, and S. Taccheo, “Advanced Solid-State Lasers 2019: Focus issue introduction,” Opt. Express, 28, 15035-15037 (2020).
8. Sennaroglu, G. Goodno, S. Mirov, J. Nilsson, A. Petersen, I. Sorokina, and S. Taccheo, “Advanced Solid-State Lasers 2019: Focus issue introduction,” Opt. Mater. Express, 10, 1303-1305 (2020).
9. Hashemkhani, K. Bilici, A. Muti, A. Sennaroglu, H. Y. Acar, “Ag₂S-Glutathione quantum dots for NIR image guided photothermal therapy,” New Journal of Chemistry, 44, 5419-5427 (2020).
10. Morova, J. E. Bae, F. Rotermund, and A. Sennaroglu, “Laser-micromachined zebra-patterned graphene as a mode locker with adjustable loss,” Opt. Lett., 45, 1826-1829 (2020).
11. Morova, M. Tonelli, V. Petrov, and A. Sennaroglu, “Upconversion pumping of a 2.3 mm Tm³⁺:KY₃F₁₀ laser with a 1064 nm ytterbium fiber laser,” Opt. Lett., 45, 931-934 (2020).
12. Muti, F. Canbaz, M. Tonelli, J. E. Bae, F. Rotermund, V. Petrov, and A. Sennaroglu, “Graphene mode-locked operation of Tm^3+:YLiF₄ and Tm^3+:KY₃F₁₀ lasers near 2.3 μm,” Opt. Lett., 45, 656-659 (2020).
13. Kahraman, M. B. Vishlaghi, I. Baylam, A. Sennaroglu, and S. Kaya, “The Roles of charge carriers in the excited state dynamics of BiVO₄ photoanodes,” J. Phys. Chem. C, 123, 28576−28583 (2019).
14. Bilici, A. Muti, A. Sennaroglu, and H. Yagci Acar, “Indocyanine green loaded APTMS coated SPIONs for dual phototherapy of cancer,” Journal of Photochemistry and Photobiology B-Biology, 201, 111648 (2019).
15. Tanisali, I. Baylam, M. Tasci, J. E. Bae, F. Rotermund, U. Demirbas, and A. Sennaroglu, “21-fs Cr:LiSAF laser mode-locked with a single-walled carbon nanotube saturable absorber,” Opt. Lett., 44, 4662-4665 (2019).
16. Pepe, M. Erdem, A. Sennaroglu, and G. Eryurek, “Enhanced gain bandwidth of Tm³⁺ and Er³⁺ doped tellurite glasses for broadband optical amplifier,” J. Non-Crystalline Solids, 522, 119501 (2019).
17. Sennaroglu, “Classification of power degrading mechanisms in an optically pumped 4-level laser: An analytical approach,” J. Opt. Soc. Am. B, 36, 2202-2209 (2019).
18. Demirbas, A. Sennaroglu, and F. X. Kaertner, “Temperature dependence of Alexandrite effective emission cross section and small signal gain over the 25-450 ºC range,” Opt. Mater. Express, 9, 3352-3370 (2019).
19. Muti, M. Tonelli, V. Petrov, and A. Sennaroglu, “Continuous-wave mid-infrared laser operation of Tm^3+:KY₃F₁₀ at 2.3 µm,” Opt. Lett., 44, 3242-3245 (2019).
20. Baylam, M. N. Cizmeciyan, N. Kakenov, C. Kocabas, A. Sennaroglu, “Ultrafast spectroscopy of voltage reconfigurable graphene saturable absorbers in the visible and near infrared” 2D Materials, 6, 035013 (2019).

Other related papers and conference presentations may be found in the “publications” link. Interested students who plan to enroll in the graduate programs of Physics, Electrical-Electronics Engineering, or Materials Science and Engineering may contact me by email (asennar at ku.edu.tr).

FORMER GRADUATE STUDENTS AND THESES 

GRADUATE STUDENTS AND THESES 

PhD Students

1) İdris Kabalcı, Istanbul Technical University, PhD in Physics, March 2006, Co-advisor: Prof. Dr. Gönül Özen,

Thesis Title: ‘Florotelürit Optik Camların Termal, Mikroyapısal ve Spektroskopik Özellikleri’ (Thermal, Microstructural, and Spectroscopic Properties of Fluoro-tellurite Optical Glasses).

2) Hamit Kalaycıoğlu, Koç University, PhD in Electrical and Electronics Engineering, September 2008.

Thesis Title: Development and Characterization of Advanced Mid-Infrared Solid State Laser Systems

3) Hüseyin Çankaya, Koç University, PhD in Materials Science and Engineering, August 2011.

Thesis Title: Development of Advanced Solid-State Pulsed Lasers in the Near and Mid Infrared for Applications in Material Characterization

4) Ersen Beyatlı, Koç University, PhD in Electrical and Electronics Engineering, January 2014.

Thesis Title: Development of Energy Efficient Tunable Solid-State Lasers with Low Power Consumption

5) Melisa Natali Çizmeciyan Sözüdoğru, PhD in Materials Science and Engineering, August 2014.

Thesis Title:Development of Mid-Infrared Coherent Sources Based on Novel Nonlinear Devices

6) Işınsu Baylam, PhD in Physics, January 2017.

Thesis Title: Graphene-Based Fast Saturable Absorber Devices and Their Application to Mode Locking of Solid-State Lasers

7) İsmail Yorulmaz, PhD in Materials Science and Engineering, December 2017.

Thesis Title: Continuous-wave Diode Pumping and Pulsed Operation of Alexandrite Lasers near 760 nm and Tm³⁺:YLF Lasers near 2300 nm.

8) Ferda Canbaz, PhD in Physics, August 2018.

Thesis Title: Graphene Mode-locked and Kerr-lens Mode-locked Operations of Cr³⁺:LiSAF Lasers Near 850 nm and Tm³⁺:YLF Lasers near 2300 nm.

9) Can Cihan, PhD in Electrical-Electronics Engineering, October 2018.

Thesis Title: Near-infrared Femtosecond Laser Sources Based on Alexandrite and Cr:LiSAF Gain Media.

10) Abdullah Kahraman, PhD in Materials Science and Engineering, July 2020, Co-advisor: Prof. Sarp Kaya

Thesis Title: Time-resolved Spectroscopy on the Carrier Dynamics of BiVO4 Photoanodes for Solar Water Oxidation.

11)  Yağız Morova, Istanbul Technical University, PhD in Engineering Physics, May 2021, Co-advisor: Doç. Dr. Seda Aksoy Esinoğlu,

Thesis Title: Femtosaniye Lazer ile İşlenen Yapıların Katıhal Lazerlerde Uygulamaları ve Üst Çevrim Pompalı Tm³⁺ KY3F10 Lazerleri (Solid-State Laser Applications of Femtosecond Laser Written Structures and Upconversion Pumped Tm³⁺ KY3F10 Lasers).

 

MS Students

1) Ümit Demirbaş, Koç University, MS in Materials Science and Engineering, June 2006

Thesis Title: Preparation, Spectroscopy, and Lasing Performance of Cr²⁺:ZnSe.

2) Hüseyin Çankaya, Koç University, MS in Materials Science and Engineering, August 2006

Thesis Title: Analysis of Solid-State Saturable Absorbers and Their Application to Passive Q Switching of Lasers.

3) Serhat Tozburun, Koç University, MS in Physics, July 2007

Thesis Title: Experimental Investigation of Pulsed, Eye-Safe Solid-State Lasers in the Near Infrared

4) Ahmet Koray Erdamar, Koç University, MS in Physics, August 2007

Thesis Title: Spectroscopic Investigation of CdS Quantum Dots and Fe²⁺:ZnSe.

5) Reyhane Kılcı, Koç University, MS in Physics, September 2008

Thesis Title: Investigation of UV-Visible Converters Based on Erbium-Doped Aromatic Polymers

6) Natali Çizmeciyan, Koç University, MS in Materials Science and Engineering, August 2009

Thesis Title: Development of a Femtosecond Cr:ZnSe Seed Laser for Regenerative Amplification

7) Aref Mostafazadeh, Koç University, MS in Electrical and Computer Engineering, August 2010

Thesis Title: Pulse Energy Optimization in Multipass-Cavity Mode-locked Femtosecond Lasers

8) Adil Tolga Görgülü, Koç University, MS in Materials Science and Engineering, July 2011

Thesis Title: Spectroscopic Investigation of Thulium Doped Tellurite Glasses for 2μm Laser Applications

9) Işınsu Baylam, Koç University, MS in Physics, September 2012

Thesis Title: Energy scaling of a multi-pass cavity femtosecond bulk laser mode locked with graphene and carbon nanotube saturable absorbers

10) Philipp Heck, Koç University, MS in Optoelectronics and Photonics Engineering, August 2013

Thesis Title: Numerical Modeling of Dispersive and Nonlinear Pulse Distortions in a Cr²⁺:ZnSe Regenerative Amplifier

11) Can Cihan, Koç University, MS in Optoelectronics and Photonics Engineering, September 2013

Thesis Title: Development of High Repetition Rate Cr:LiCAF Femtosecond Lasers and Application of Multipass-Cavity Ti:Sapphire Lasers in THz Generation

12) Ferda Canbaz, Koç University, MS in Optoelectronics and Photonics Engineering, September 2013

Thesis Title: Sub–15 Femtosecond Pulse Generation From a Kerr–Lens Mode–Locked Cr:LiSAF Laser Near 850 nm with a Gain–Matched Output Coupler

13) Gökhan Tanısalı, Koç University, MS in Physics, January 2020

Thesis Title: Generation of 21-fs Pulses from a Cr:LiSAF Laser Mode Locked with a Single-Walled Carbon Nanotube Saturable Absorber

Former Graduate Students

Işınsu Baylam, PhD  in Physics

İsmail Yorulmaz, PhD in Materials Science and Engineering

Ferda Canbaz, PhD in Physics

Can Cihan, PhD  in Electrical-Electronics Engineering

 

Group Pictures

Koç University Laser Research Laboratory, Emirgan, January 2014

Koç University Laser Research Laboratory, Advanced Solid-State Lasers Congress, Paris, France, October-November 2013

Koç University Laser Research Laboratory, Kadıköy, September 2012

Koç University Laser Research Laboratory, Spring 2011

(Koç University Laser Research Laboratory, Prof. Sarper Özharar and Işınsu Baylam, October 21, 2011)

Ersen Beyatlı and İsmail Yorulmaz

(Koç University Laser Research Laboratory, Ferda Canbaz and Cem Yetişmişoğlu, October 21, 2011)

(Koç University Laser Research Laboratory, Natali Çizmeciyan and Hüseyin Çankaya, June 24, 2011)

(Işınsu Baylam, Fotonik 2013 Conference, Aselsan, Ankara, September 2013)

(Ferda Canbaz, Fotonik 2013 Conference, Aselsan, Ankara, September 2013)

(KU Laser Research Laboratory, Ersen Beyatlı and İsmail Yorulmaz)

(Koç University, Laser Research Laboratory, Garipçe, Spring 2012)

(Koç University Laser Research Laboratory, Spring 2012)

(Natali Çizmeciyan, Koç University Surface Science and Technology Research Center)

(June 2004, KU Commencement Ceremony with Hüseyin Çankaya)

(International Laser Physics Conference, Trondheim, Norway, July 2008, with Hüseyin Çankaya)

   (Serhat Tozburun and Hüseyin Çankaya)

(Ümit Demirbaş)

(Koç University, Commencement Ceremony, June 2009, with Natali Çizmeciyan)

(With Hüseyin Çankaya and Adil Tolga Görgülü, 2011 Koç University graduation ceremony, June 25, 2011)

(With Dr. Hüseyin Çankaya after his PhD thesis defense, August 12, 2011)

(With Dr. Ersen Beyatlı after his PhD thesis defense, January 22, 2014)