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Digitale Medien

Numerical study of active mode locking in pulsed solid-state lasers (1993)

Eichler, H. J. ; Koltchanov, I. ; Liu, B.

Springer

Applied physics 57 (1993), S. 349-357

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ISSN: 1432-0649

Schlagwort(e): 42.60.Fc ; 42.55.Rz

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Transient mode locking of spiking solid-state lasers is studied with the help of two theoretical approaches. The first of them is an extension of the previous transient theory with single-mode rate equations to find the limited spike build-up time depending on the modulation index. The second is based on semiclassical multimode equations describing both spiking behaviour and formation of the picosecond pulse from the initial noise. The derivation of the equations as well as a comparison of results from both approaches are given. The obtained numerical results agree with experimental data. It is shown that the pulsewidth in a spiking laser can approach the small value predicted by the steady-state theory. This minimal pulsewidth can be reached at a smaller modulation index than predicted by the standard transient mode locking theory. The minimal modulation index for generation of good picosecond pulses free of noise is found to be ∼0.6 in our case. Losses connected with amplitude modulation have a negligible effect on spike build-up time and pulse duration.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00332460

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Digitale Medien

Cr4+:YAG as passive Q-switch for a Nd:YALO oscillator with an average repetition rate of 2.7 kHz, TEM00 mode and 13 W output (1994)

Eichler, H. J. ; Haase, A. ; Kokta, M. R. ; [weitere]

Springer

Applied physics 58 (1994), S. 409-411

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ISSN: 1432-0649

Schlagwort(e): 42.55.Rz ; 42.60.By

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract A conventional pulsed Nd:YALO oscillator was passively Q-switched with a Cr4+:YAG crystal. During each of the flashes, with a repetition rate of 100 Hz, a burst of 27 Q-switch pulses with a half width (FWHM) of 140 ns was generated. The minimal pulse-to-pulse time interval within the burst was about 5 µs. The average repetition rate of these Q-switch pulses was 27 × 100 Hz. Nd: YALO as active material does not show any thermally induced birefringence and therefore a good TEM00 mode was realized despite the high thermal load of the crystal. The 4 × 79 mm laser rod produced 13 W average output power at 1080 nm with an efficiency of 0.5%. In contrast to earlier used LiF:F 2 − absorbers as passive Q-switch the Cr4+:YAG-crystals did not bleach and therefore the system operated very stable and reliable.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01081882

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Digitale Medien

Numerical study of the spiking instability caused by modulation frequency detuning in an actively mode-locked solid-state laser (1995)

Eichler, H. J. ; Koltchanov, I. G. ; Liu, B.

Springer

Applied physics 61 (1995), S. 81-88

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ISSN: 1432-0649

Schlagwort(e): 42.55.Rz ; 42.60.Fc ; 42.60.Gd

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We have studied both analytically and numerically the transient active mode locking in the case of a modulation frequency detuning. Analytical results for pulse width and position, extending previous works, are obtained within the frame of the stationary theory by assuming that a short pulse restores its shape after each round trip. Numerical evaluation leads to relaxation oscillations and change of the short-pulse shape. The results of both approaches agree with each other only for small detunings, when laser is operated in the steady state. For larger detunings the laser dynamics change dramatically, and the three operation modes observed earlier in experiments were demonstrated numerically: sequences of damped relaxation oscillations, deep periodic spiking and chaotic spiking. The periodic spiking can be used to increase the intensity of mode-locked pulses.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01090976

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