Mode locking with frequency dependent nonlinear mirror of Nd:YAG laser with electro-optical negative feedback has been presented. We use a LBO based nonlinear mirror thermally stabilized at a temperature corresponding to noncritical phase matching of the frequency doubling at 1.064 μm. Employing a resonator
polarization output detected by a fast photodiode we control resonator losses through a Pockels cell. By creating a negative feedback we achieved q-switch suppression, thus stabilizing the mode-locking regime. Through a simple theoretical model we derived a relation for the laser parameters for stable laser operation. We achieved a stable train of picosecond pulses grouped in the 200 microsecond pump macropulse. Macropulse output energy
is 4 mJ at a pump repetition rate of 400 Hz. The picosecond pulse train frequency determined by the resonator length is 115 MHz.
A nanosecond Nd:YAG based high-energy kilohertz Master Oscillator Power Amplifier (MOPA) system has been developed. The Q-switched master oscillator emits 6.5-ns, 1-kHz pulses with energy up to 1.6 mJ. The design of the oscillator ensures TEM00 operation with high stability and insensitivity to cavity misalignment. Two different amplification schemes - slab and rod geometry of the amplifiers have been studied. We have developed a compact, five-pass
gain module with slab design, pumped by four 30-W collimated laser diode bars. The amplified output energy is 8 mJ at 1 kHz. The optical-to-optical conversion efficiency is 15 %. The second scheme is based on side-pumped rod preamplifier with consequent end amplifier with depolarization compensation. This system delivers up to 18 mJ linearly polarized TEM00 pulses - corresponding to 5 % optical-to-optical conversion efficiency.
BiB3O6 (BIBO), the first low-symmetry (monoclinic class 2) inorganic nonlinear crystal that became commercially
available, possesses some unique advantages for applications in ultrafast laser technology which are primarily related to
its dispersive properties. In the present paper, these properties are analyzed in more detail and compared with other
crystals. Of special interest is the pumping of this material near 800 nm for broadband parametric amplification in the
near-infrared between 1.15 and 2.4 μm. We present experimental results on generation and amplification of
ultrabroadband femtosecond continua in this spectral range using amplified Ti:sapphire lasers as pump sources.
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