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ABSTRACT: Without cavity dumping or external amplification, we report a femtosecond Cr:forsterite laser with a 1.4W output power and 2W in continuous wave (CW) operated with a crystal temperature of 267K. In the femtosecond regime, the oscillator generates Kerr-lens-mode-locked 84fs pulses with a repetition rate of 85MHz, corresponding to a high 16.5nJ pulse energy directly from a single Cr:forsterite resonator. This intense femtosecond Cr:forsterite laser is ideal to pump varieties of high power fiber light sources and could be thus ideal for many biological and spectroscopy applications.
Optics Express 11/2010; 18(23):24085-24091. · 3.59 Impact Factor
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ABSTRACT: Without cavity dumping or external amplification, we report a femtosecond Cr:forsterite laser with a 1.4 W output power and 2 W in continuous wave (CW) operated with a crystal temperature of 267 K. In the femtosecond regime, the oscillator generates Kerr-lens-mode-locked 84 fs pulses with a repetition rate of 85 MHz, corresponding to a high 16.5 nJ pulse energy directly from a single Cr:forsterite resonator. This intense femtosecond Cr:forsterite laser is ideal to pump varieties of high power fiber light sources and could be thus ideal for many biological and spectroscopy applications.
Optics Express 11/2010; 18(23):24085-91. · 3.59 Impact Factor
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ABSTRACT: With a micro-electro-mechanical system (MEMS) mirror, we successfully developed a miniaturized epi-third-harmonic-generation (epi-THG) fiber-microscope with a video frame rate (31 Hz), which was designed for in vivo optical biopsy of human skin. With a large-mode-area (LMA) photonic crystal fiber (PCF) and a regular microscopic objective, the nonlinear distortion of the ultrafast pulses delivery could be much reduced while still achieving a 0.4 microm lateral resolution for epi-THG signals. In vivo real time virtual biopsy of the Asian skin with a video rate (31 Hz) and a sub-micron resolution was obtained. The result indicates that this miniaturized system was compact enough for the least invasive hand-held clinical use.
Optics Express 08/2010; 18(16):17382-91. · 3.59 Impact Factor
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ABSTRACT: With miniaturized tube lenses and a micro-electro-mechanical system (MEMS) mirror, we constructed a miniaturized multiphoton microscope system. Through a two-dimensional asynchronous scanning of the MEMS mirror, 24Hz frame rate can be realized. With a high numerical aperture objective, sub-micron resolution can also be achieved at the same time.
Optics Express 08/2008; 16(14):10501-6. · 3.59 Impact Factor
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ABSTRACT: A 1.2- to 2.2-mum tunable femtosecond light source based on the soliton-self-frequency-shift effect of high-power Cr: forsterite laser pulses propagating inside a highly nonlinear photonic crystal fiber is reported. The demonstrated soliton self-frequency shift is higher than 42% of the pump laser frequency, corresponding to a record 910-nm wavelength tuning range. Due to the advantages of simplicity, easy tunability, high-temperature stability, and low cost of this new femtosecond light source, it accordingly, could be widely applicable for many applications.
IEEE Photonics Technology Letters 07/2008; 20(11):900-902. · 2.19 Impact Factor
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Ming-Che Chan, Shih-Hsuan Chia,
Tzu-Ming Liu,
Tsung-Han Tsai,
Min-Chen Ho,
Anatoly A Ivanov,
Aleksei M Zheltikov,
Jiun-Yi Liu,
Hsiang-Lin Liu,
Chi-Kuang Sun,
R O C Also
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ABSTRACT: A 1.2-to 2.2-m tunable femtosecond light source based on the soliton-self-frequency-shift effect of high-power Cr : forsterite laser pulses propagating inside a highly nonlinear photonic crystal fiber is reported. The demonstrated soliton self-frequency shift is higher than 42% of the pump laser fre-quency, corresponding to a record 910-nm wavelength tuning range. Due to the advantages of simplicity, easy tunability, high-temperature stablility, and low cost of this new femtosecond light source, it accordingly, could be widely applicable for many applications. Index Terms—Nonlinear optics, ultrafast optics, lasers tuning, optical solitons. W IDELY wavelength-tunable femtosecond sources with nJ pulse energy are desirable in many applications such as optical communications, coherent anti-Stokes Raman (CARS) microscopy [1], carrier heating research in quantum wells [2], multiphoton multiharmonic laser-scanning mi-croscopy [3], and the study of time-resolved ultrafast molecular dynamics [4], etc. Conventional frequency-tunable sources utilize the optical parametric generation (OPG) effect inside nonlinear crystals to convert a high-energy photon into two or more low-energy photons. By changing the phase-matching condition inside the nonlinear crystal, the wavelength of the converted low-energy photons can be tuned. However, the threshold pumping power is on the order of watts so Manuscript received December 20, 2007; revised February 16, 2008.
IEEE Photonics Technology Letters 06/2008; 20(11):900-902. · 2.19 Impact Factor
