Steady-state ultrashort pulses generated by passive mode locking of a solid-state laser with an active feedback

Komarov, Konstantin; Kuch'yanov, Aleksandr S; Ugozhaev, V. D.

doi:10.1070/qe1986v016n04abeh006533

Cited by 19 publications

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“…Needs for lasers with better energy and temporal stability, effective output picosecond pulses shortening stimulated development of combined schemes based on active-passive mode-locking, cavity Q-factor control and negative feedback (NFB). Different approaches involving passive mode-locking [26][27][28], active (electro-optical) negative feedback [29,30] and cavity Q-factor control have been proposed since the 1980s and were used to achieve a more stable generation of picosecond pulses. At the same time, a combined scheme of activepassive mode-locking and electro-optical NFB was proposed [31,32].…”

Section: Introductionmentioning

confidence: 99%

Picosecond Pulsed-Periodic High-Peak Power Nd:YAG Laser Operationally Controlled by KTP-Based Pockels Cell

et al. 2022

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Electro-optical modulators are effectively used for ultrafast pulse lasers operation control. The scheme of picosecond pulse-periodic high-peak-power Nd:YAG lasers is composed of an active-passive mode-locked and negative feedback-controlled master oscillator and regenerative amplifier based on common end-diode-pumped Nd:YAG crystal. A double-crystal thermally compensated Pockels cell based on KTP crystals of the Y-cut direction is employed as a key control element. The cell was assembled using a pair of equal-length crystals grown according to high-resistivity technology. The scheme provides output pulses with energy up to 1.6 mJ, a duration of 25 ps at repetition rates tunable from 0 to 200 Hz. The laser operation stages are analyzed in detail. The scheme looks attractive and promising for developing advanced ultrafast laser systems with higher repetition rates, peak and, accordingly, average power levels. The Pockels cell based on KTP crystals expands the line of available fast electro-optical control elements, along with the previously used RTP ones. The factors limiting laser pulse energy and repetition rate are discussed. Parasitic nonlinear conversion in the crystals of the Pockels cell along the axis may play an essential role. The results of comparative measurements of the second and third harmonics made with the Pockels cells based on KTP and RTP crystals of both X-cut and Y-cut directions are presented. The minimum second and third harmonics efficiency levels observed in the Y-cut Pockels cells of the KTP crystal seem to be their important advantage.

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Section: Introductionmentioning

confidence: 99%

Picosecond Pulsed-Periodic High-Peak Power Nd:YAG Laser Operationally Controlled by KTP-Based Pockels Cell

et al. 2022

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“…[1][2][3][4][5] Negative feedback (NF) operation results in almost 100% mode locking and high-contrast pulses generation at the output due to controlled prolongation of the nonlinear stage of lasing. The pulse intensity in the cavity can be maintained by NF on the level when considerable pulse compression would occur.…”

Section: Introductionmentioning

confidence: 99%

Neutronography: history and trends of further progress

Ozerov

1997

Phys.-Usp.

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The results of optimisation of active and passive negative feedback (NF) for generation of stable compressed picosecond pulse trains in Nd:glass and Nd:YAG lasers using a modulator driven by fast photomultiplier and a GaAs passive element are presented. Conditions of prolonged pulse trains generation with the duration of trains varied from 0.3 µs to 200 µs depending on parameters of active NF were investigated. Generation of long (1000 ns) pulse trains in passive NF regime was obtained. Pulse compression in active and passive NF regimes (from 8 ps to 1.4 ps and from 35 ps to 13 ps, respectively) was achieved.

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Negative feedback using a nonlinear mirror for the generation of a long train of short light pulses

Stankov

1991

Appl. Phys. B

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Steady-state ultrashort pulses generated by passive mode locking of a solid-state laser with an active feedback

Cited by 19 publications

References 0 publications

Picosecond Pulsed-Periodic High-Peak Power Nd:YAG Laser Operationally Controlled by KTP-Based Pockels Cell

Picosecond Pulsed-Periodic High-Peak Power Nd:YAG Laser Operationally Controlled by KTP-Based Pockels Cell

Neutronography: history and trends of further progress

Negative feedback using a nonlinear mirror for the generation of a long train of short light pulses

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