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Alexandrite Laser

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Arkady Major – 1st expert on this subject based on the ideXlab platform

  • dispersion and anisotropy of thermo optical properties of Alexandrite Laser crystal
    Optical Materials Express, 2018
    Co-Authors: Pavel Loiko, Shirin Ghanbari, V N Matrosov, K V Yumashev, Arkady Major

    Abstract:

    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].

  • Femtosecond Alexandrite Laser with InP/InGaP Quantum-Dot Saturable Absorber
    2018 International Conference Laser Optics (ICLO), 2018
    Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady Major

    Abstract:

    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.

  • InP/InGaP quantum-dot SESAM mode-locked Alexandrite Laser
    Solid State Lasers XXVII: Technology and Devices, 2018
    Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady Major

    Abstract:

    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.

Shirin Ghanbari – 2nd expert on this subject based on the ideXlab platform

  • dispersion and anisotropy of thermo optical properties of Alexandrite Laser crystal
    Optical Materials Express, 2018
    Co-Authors: Pavel Loiko, Shirin Ghanbari, V N Matrosov, K V Yumashev, Arkady Major

    Abstract:

    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].

  • Femtosecond Alexandrite Laser with InP/InGaP Quantum-Dot Saturable Absorber
    2018 International Conference Laser Optics (ICLO), 2018
    Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady Major

    Abstract:

    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.

  • InP/InGaP quantum-dot SESAM mode-locked Alexandrite Laser
    Solid State Lasers XXVII: Technology and Devices, 2018
    Co-Authors: Shirin Ghanbari, Ksenia A. Fedorova, Andrey B. Krysa, Edik U. Rafailov, Arkady Major

    Abstract:

    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.

Richard E Fitzpatrick – 3rd expert on this subject based on the ideXlab platform

  • use of the q switched 755 nm Alexandrite Laser to treat recalcitrant pigment after depigmentation therapy for vitiligo
    Dermatologic Surgery, 2004
    Co-Authors: Richard E Fitzpatrick

    Abstract:

    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.

  • tattoo removal using the Alexandrite Laser
    Archives of Dermatology, 1994
    Co-Authors: Richard E Fitzpatrick, Mitchel P Goldman

    Abstract:

    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)

  • use of the Alexandrite Laser 755 nm 100 nsec for tattoo pigment removal in an animal model
    Journal of The American Academy of Dermatology, 1993
    Co-Authors: Richard E Fitzpatrick, Mitchel P Goldman, Javier Ruizesparza

    Abstract:

    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.