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Arkady Major - One of the best experts on this subject based on the ideXlab platform.
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dispersion and anisotropy of thermo optical properties of Alexandrite Laser crystal
Optical Materials Express, 2018Co-Authors: Pavel Loiko, Shirin Ghanbari, V N Matrosov, K V Yumashev, Arkady MajorAbstract:Dispersion and anisotropy of thermal coefficients of the optical path (TCOP) and thermo-optic coefficients (TOCs) of Alexandrite Laser crystal (Cr3+:BeAl2O4) are studied for the three principal light polarizations, E || a, E || b and E || c. Thermo-optic dispersion formulas are presented for the spectral range of 0.4-1.1 µm. All TOCs are positive and show a notable polarization-anisotropy, dna/dT = 5.9, dnb/dT = 6.9 and dnc/dT = 15.2 × 10−6 K−1 at 0.75 µm. Thermal lensing was characterized in a continuous-wave Alexandrite Laser pumped at 0.532 µm and operating at 0.7509 µm (for E || b). The measured thermal lens was weak, positive and slightly astigmatic. The sensitivity factors of the thermal lens were found to be Mx = 1.74 and My = 2.38 [m−1/W].
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Femtosecond Alexandrite Laser with InP/InGaP Quantum-Dot Saturable Absorber
2018 International Conference Laser Optics (ICLO), 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:A semiconductor saturable absorber mirror (SESAM) passively mode-locked Alexandrite Laser was demonstrated. Using an InP/InGaP quantum-dot saturable absorber mirror, pulse duration of 380 fs at 775 nm was obtained. The Laser was pumped at 532 nm and generated 295 mW of average output power in mode-locked regime with a pump power of 7.3 W. To the best of our knowledge, this is the first report of a passively mode-locked Alexandrite Laser using SESAM in general and quantum-dot SESAM in particular.
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InP/InGaP quantum-dot SESAM mode-locked Alexandrite Laser
Solid State Lasers XXVII: Technology and Devices, 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:A semiconductor saturable absorber mirror (SESAM) passively mode-locked Alexandrite Laser was demonstrated. Using an InP/InGaP quantum-dot saturable absorber mirror, pulse duration of 420 fs at 774 nm was obtained. The Laser was pumped at 532 nm and generated 325 mW of average output power in mode-locked regime with a pump power of 7.12 W. To the best of our knowledge, this is the first report of a passively mode-locked Alexandrite Laser using SESAM in general and quantum-dot SESAM in particular.
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Dual-wavelength operation of a continuous-wave Alexandrite Laser
Solid State Lasers XXVII: Technology and Devices, 2018Co-Authors: Shirin Ghanbari, Arkady MajorAbstract:A continuous-wave dual-wavelength operation of an Alexandrite Laser was demonstrated. The oscillator produced 870 mW of average output power for 5W of incident pump power. This corresponded to a slope efficiency of 21% and an optical-to-optical efficiency of 17.4%. A single 4-mm-thick intracavity birefringent filter plate placed at Brewster’s angle resulted in dual-wavelength radiation at 744.2 nm and 757.2 nm wavelengths (6.9 THz of frequency difference). To the best of our knowledge, this is the first report of a dual-wavelength operation of an Alexandrite Laser.
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femtosecond Alexandrite Laser passively mode locked by an inp ingap quantum dot saturable absorber
Optics Letters, 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:An Alexandrite Laser passively mode-locked using an InP/InGaP quantum-dot semiconductor saturable absorber mirror (QD-SESAM) was demonstrated. The Laser was pumped at 532 nm and generated pulses as short as 380 fs at 775 nm with an average output power of 295 mW. To the best of our knowledge, this is the first report on a passively mode-locked femtosecond Alexandrite Laser using a SESAM in general and a QD-SESAM in particular.
Shirin Ghanbari - One of the best experts on this subject based on the ideXlab platform.
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dispersion and anisotropy of thermo optical properties of Alexandrite Laser crystal
Optical Materials Express, 2018Co-Authors: Pavel Loiko, Shirin Ghanbari, V N Matrosov, K V Yumashev, Arkady MajorAbstract:Dispersion and anisotropy of thermal coefficients of the optical path (TCOP) and thermo-optic coefficients (TOCs) of Alexandrite Laser crystal (Cr3+:BeAl2O4) are studied for the three principal light polarizations, E || a, E || b and E || c. Thermo-optic dispersion formulas are presented for the spectral range of 0.4-1.1 µm. All TOCs are positive and show a notable polarization-anisotropy, dna/dT = 5.9, dnb/dT = 6.9 and dnc/dT = 15.2 × 10−6 K−1 at 0.75 µm. Thermal lensing was characterized in a continuous-wave Alexandrite Laser pumped at 0.532 µm and operating at 0.7509 µm (for E || b). The measured thermal lens was weak, positive and slightly astigmatic. The sensitivity factors of the thermal lens were found to be Mx = 1.74 and My = 2.38 [m−1/W].
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Femtosecond Alexandrite Laser with InP/InGaP Quantum-Dot Saturable Absorber
2018 International Conference Laser Optics (ICLO), 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:A semiconductor saturable absorber mirror (SESAM) passively mode-locked Alexandrite Laser was demonstrated. Using an InP/InGaP quantum-dot saturable absorber mirror, pulse duration of 380 fs at 775 nm was obtained. The Laser was pumped at 532 nm and generated 295 mW of average output power in mode-locked regime with a pump power of 7.3 W. To the best of our knowledge, this is the first report of a passively mode-locked Alexandrite Laser using SESAM in general and quantum-dot SESAM in particular.
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InP/InGaP quantum-dot SESAM mode-locked Alexandrite Laser
Solid State Lasers XXVII: Technology and Devices, 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:A semiconductor saturable absorber mirror (SESAM) passively mode-locked Alexandrite Laser was demonstrated. Using an InP/InGaP quantum-dot saturable absorber mirror, pulse duration of 420 fs at 774 nm was obtained. The Laser was pumped at 532 nm and generated 325 mW of average output power in mode-locked regime with a pump power of 7.12 W. To the best of our knowledge, this is the first report of a passively mode-locked Alexandrite Laser using SESAM in general and quantum-dot SESAM in particular.
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Dual-wavelength operation of a continuous-wave Alexandrite Laser
Solid State Lasers XXVII: Technology and Devices, 2018Co-Authors: Shirin Ghanbari, Arkady MajorAbstract:A continuous-wave dual-wavelength operation of an Alexandrite Laser was demonstrated. The oscillator produced 870 mW of average output power for 5W of incident pump power. This corresponded to a slope efficiency of 21% and an optical-to-optical efficiency of 17.4%. A single 4-mm-thick intracavity birefringent filter plate placed at Brewster’s angle resulted in dual-wavelength radiation at 744.2 nm and 757.2 nm wavelengths (6.9 THz of frequency difference). To the best of our knowledge, this is the first report of a dual-wavelength operation of an Alexandrite Laser.
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femtosecond Alexandrite Laser passively mode locked by an inp ingap quantum dot saturable absorber
Optics Letters, 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:An Alexandrite Laser passively mode-locked using an InP/InGaP quantum-dot semiconductor saturable absorber mirror (QD-SESAM) was demonstrated. The Laser was pumped at 532 nm and generated pulses as short as 380 fs at 775 nm with an average output power of 295 mW. To the best of our knowledge, this is the first report on a passively mode-locked femtosecond Alexandrite Laser using a SESAM in general and a QD-SESAM in particular.
Richard E Fitzpatrick - One of the best experts on this subject based on the ideXlab platform.
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use of the q switched 755 nm Alexandrite Laser to treat recalcitrant pigment after depigmentation therapy for vitiligo
Dermatologic Surgery, 2004Co-Authors: Richard E FitzpatrickAbstract:Background. In patients with extensive vitiligo, depigmentation therapy is often preferred over attempts to restore skin color. Bleaching creams sometimes fail to permanently depigment the skin, leaving disfiguring pigmented patches. This recalcitrant pigmentation may be treated with Q-switched Laser technology. Objective. The objective was use the Q-switched Alexandrite Laser to treat recalcitrant pigmentation after unsuccessful attempts at total-body depigmentation for vitiligo. Methods. We have attempted to destroy the remaining melanin pigmentation in a 68-year-old woman with vitiligo by using selective photothermolysis from a Q-switched Alexandrite Laser. Results. Excellent results were achieved after 10 treatment sessions, with no recurrence of pigment after 1 year of follow-up. Conclusion. The Q-switched Alexandrite Laser was used successfully and safely in a vitiligo patient with recalcitrant pigmentation after unsuccessful depigmentation therapy and may prove useful in other such cases.
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tattoo removal using the Alexandrite Laser
Archives of Dermatology, 1994Co-Authors: Richard E Fitzpatrick, Mitchel P GoldmanAbstract:Background: Until the recent development of the Q-switched Lasers, it was not possible to remove tattoos without causing scarring, sometimes very disfiguring. Variations in wavelengths and pulse widths used may result in different clinical effectiveness or risks. The objective of this study was to determine the effectiveness of the Alexandrite Laser in removing professional and amateur tattoo pigment without adverse tissue response. Results: We describe the clinical and histologic effects of the use of a new Q-switched Laser for treatment of tattoos, the Alexandrite Laser (wavelength, 755 nm; pulse width, 100 nanoseconds). The results of treatment of 17 patients with professional tattoos and eight patients with amateur tattoos are analyzed. Greater than 95% removal of tattoo pigment averaged 8.9 treatment sessions. Transient hypopigmentation occurred in approximately 50% of patients, and transient textural surface changes occurred in 12%. Conclusions: The Alexandrite Laser is a safe and effective treatment modality for removal of black and blueblack tattoo pigment. (Arch Dermatol. 1994;130:1508-1514)
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use of the Alexandrite Laser 755 nm 100 nsec for tattoo pigment removal in an animal model
Journal of The American Academy of Dermatology, 1993Co-Authors: Richard E Fitzpatrick, Mitchel P Goldman, Javier RuizesparzaAbstract:Background: All previous treatment modalities for the removal of tattoos, with the possible exception of the Q-switched ruby and YAG Lasers, result in scarring. Objective: The purpose of this study was to investigate the use of a new Laser that may remove tattoo pigment without leaving a scar. Methods: A Yucatan micropig was tattooed by a professional tattoo artist with black, blue, green, and red pigments. These tattoos were then treated with single overlapping pulses with the Alexandrite Laser (wavelength 755 nm, pulse 100 nsec) and evaluated clinically and histologically. Comparison treatment with an argon Laser (wavelength 488 nm, 514 nm, continuous-wave) and flashlamp-pumped dye Laser (wavelength 585 nm, pulse 450 μsec) was performed as well for removal of red tattoo pigment. Results: The Alexandrite Laser was found to be very effective in removal of professional and amateur black tattoo pigment, moderately effective in removal of blue and green pigment, and minimally effective in removal of red pigment. No scarring was seen clinically or histologically. Conclusion: The Alexandrite Laser shows promise as a treatment modality for tattoo removal without scarring.
Tina S Alster - One of the best experts on this subject based on the ideXlab platform.
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q switched Alexandrite Laser treatment 755 nm of professional and amateur tattoos
Journal of The American Academy of Dermatology, 1995Co-Authors: Tina S AlsterAbstract:Abstract Background: Several Laser techniques have been proposed for the removal of decorative tattoos. The Lasers that have been used most successfully are Q-switched red or near-infrared systems because of their ability to target tattoo pigment selectively with minimal risk of scarring or permanent pigmentary changes. Objectives: The objectives of this study were to determine the clinical effectiveness of the newest Q-switched system, the Alexandrite Laser, in removing amateur and professional tattoos and to observe side effects. Methods: Twenty-four multicolored professional tattoos and 18 blue-black amateur tattoos were treated with the Q-switched Alexandrite Laser (755 nm, 100 nsec) at 2-month intervals until total clearing was achieved. The 510 nm pulsed dye Laser was used to treat tattoos that contained red pigment. Results: Professional tattoos required an average of 8.5 Alexandrite Laser treatments for total clearance, whereas only 4.6 treatments were necessary to remove amateur tattoos. Red tattoo pigment was successfully treated with an average of two 510 nm pulsed dye Laser sessions. No scarring or long-standing pigmentary changes were seen in Laser-irradiated skin. Conclusion: The Q-switched Alexandrite Laser is highly effective in removing multicolored professional and amateur tattoos without adverse sequelae. The 510 nm pulsed dye Laser was useful in eliminating red tattoo pigment.
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treatment of nevus of ota by the q switched Alexandrite Laser
Dermatologic Surgery, 1995Co-Authors: Tina S Alster, Carmen M WilliamsAbstract:BACKGROUNDThe Q-switched Alexandrite Laser (755 nm, 100 nanoseconds) selectively targets and destroys cutaneous pigment such as that found in dermal pigmented lesions and tattoos. The nevus of Ota is a benign dermal melanocytic lesion, which, due to its large size and periocular location, has been n
Edik U. Rafailov - One of the best experts on this subject based on the ideXlab platform.
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Femtosecond Alexandrite Laser with InP/InGaP Quantum-Dot Saturable Absorber
2018 International Conference Laser Optics (ICLO), 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:A semiconductor saturable absorber mirror (SESAM) passively mode-locked Alexandrite Laser was demonstrated. Using an InP/InGaP quantum-dot saturable absorber mirror, pulse duration of 380 fs at 775 nm was obtained. The Laser was pumped at 532 nm and generated 295 mW of average output power in mode-locked regime with a pump power of 7.3 W. To the best of our knowledge, this is the first report of a passively mode-locked Alexandrite Laser using SESAM in general and quantum-dot SESAM in particular.
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InP/InGaP quantum-dot SESAM mode-locked Alexandrite Laser
Solid State Lasers XXVII: Technology and Devices, 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:A semiconductor saturable absorber mirror (SESAM) passively mode-locked Alexandrite Laser was demonstrated. Using an InP/InGaP quantum-dot saturable absorber mirror, pulse duration of 420 fs at 774 nm was obtained. The Laser was pumped at 532 nm and generated 325 mW of average output power in mode-locked regime with a pump power of 7.12 W. To the best of our knowledge, this is the first report of a passively mode-locked Alexandrite Laser using SESAM in general and quantum-dot SESAM in particular.
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femtosecond Alexandrite Laser passively mode locked by an inp ingap quantum dot saturable absorber
Optics Letters, 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:An Alexandrite Laser passively mode-locked using an InP/InGaP quantum-dot semiconductor saturable absorber mirror (QD-SESAM) was demonstrated. The Laser was pumped at 532 nm and generated pulses as short as 380 fs at 775 nm with an average output power of 295 mW. To the best of our knowledge, this is the first report on a passively mode-locked femtosecond Alexandrite Laser using a SESAM in general and a QD-SESAM in particular.
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Femtosecond Alexandrite Laser passively mode-locked by an InP/InGaP quantum-dot saturable absorber
Optics Letters, 2018Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady MajorAbstract:An Alexandrite Laser passively mode-locked using an InP/InGaP quantum-dot semiconductor saturable absorber mirror (QD-SESAM) was demonstrated. The Laser was pumped at 532 nm and generated pulses as short as 380 fs at 775 nm with an average output power of 295 mW. To the best of our knowledge, this is the first report on a passively mode-locked femtosecond Alexandrite Laser using a SESAM in general and a QD-SESAM in particular.
