Browsing by Author "0000-0001-8420-8965 [Demirbaş, Ümit]"
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Broadly tunable two-color lasing of Cr:LiCAF with on-surface and off-surface optical axis birefringent filters: performance comparison
Ertürk, Zekican; Okuyucu, Serdar; Kılınç, Muharrem; Öztürk, Yusuf; Pergament, Mikhail; Kärtner, Franz X.; Demirbaş, Ümit (Applied Optics, 2022)We studied the two-color lasing performance of a Cr:LiCAF laser using crystal quartz on-surface and off-surface optical axis birefringent filters (BRFs). Four different on-surface optical axis BRFs with thicknesses of 2 ... -
Cr: Colquiriite Lasers: Current Status and Challenges for Further Progress
Demirbaş, Ümit (Progress in Quantum Electronics, 2019)Cr: Colquiriite laser materials (Cr:LiCAF, Cr:LiSAF, Cr:LiSGaF) own broad absorption bands in the visible region that allow direct-diode pumping by well-developed low-cost red diodes. Moreover, they possess broad emission ... -
Passively Q-switched Cr:LiCAF laser with a saturable Bragg reflector
Okuyucu, Serdar; Öztürk, Yusuf; Demirbaş, Ümit (Applied Physics B: Lasers and Optics, 2021)We present a low-cost multimode diode pumped passively Q-switched Cr:LiCAF laser operating near 800 nm. AlGaAs-based saturable Bragg reflectors (SBRs) were used for passive Q-switching. The system is experimentally ... -
Temperature Dependence of Emission Cross Section and Fluorescence Lifetime of Cr:Colquiriites in 78-618 K Range
Okuyucu, Serdar; Demirbaş, Ümit; Tanaka, Hiroki; Thesinga, Jelto; Öztürk, Yusuf; Kärtner, Franz X.; Pergament, Mikhail (Optica Advanced Photonics Congress 2022, 2022)We have measured the temperature dependence of fluorescence lifetime and emission cross section in Cr:LiCAF, Cr:LiSGaF and Cr:LiSAF in the 78-618 K range. Our results confirm their potential as high-power ultrafast sources ... -
Temperature dependence of the emission cross-section and fluorescence lifetime in Cr:LiCAF, Cr:LiSAF, and Cr:LiSGaF between 78 K and 618 K
Okuyucu, Serdar; Thesinga, Jelto; Tanaka, Hiroki; Öztürk, Yusuf; Kärtner, Franz X.; Pergament, Mikhail; Demirbaş, Ümit (2023)Cr:Colquiriites (Cr:LiCAF, Cr:LiSAF, and Cr:LiSGaF) are well-known for their broad emission bands in the near-infrared region. Unfortunately, due to their relatively weak thermomechanical strength, average powers from ... -
Thermal and population lensing of Yb:YLF at cryogenic temperature
Kılınç, Muharrem; Demirbaş, Ümit; Gonzalez-diaz, Juan B.; Thesinga, Jelto; Kellert, Martin; Palmer, Guido; Kaertne, Franz X.; Pergament, Mikhail (2023)We present what is, to our knowledge, the first detailed study of thermal and population lensing in cryogenically cooled Yb:YLF. Using a rod-shaped a-cut Yb:YLF crystal, the thermal lens strength is measured as a function ...