Subpicosecond pulse generation in a branched passively mode-locked Nd-glass laser

Graf, F.; Schmidt, J. A.; Penzkofer, Alfons

doi:10.1016/0030-4018(85)90286-x

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…Besides passive mode-locking, the saturable absorbers are employed to suppress background radiation [333], to decouple amplifiers (suppression of amplified spontaneous emission signals) [276,278,[306][307][308][309][310][311]315,334] and to shorten light pulses [46,48,276,[335][336][337][338][339][340][341]. It should be noted that the self-induced ellipse rotation of Kerr liquids between polarizers and retardation plates may be used as well for passive background suppression and gain isolation [328].…”

Section: Pulse Shortening With Saturable Absorbersmentioning

confidence: 99%

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Passive Q-switching and mode-locking for the generation of nanosecond to femtosecond pulses

Penzkofer

1988

Appl. Phys. B

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Abstract. The passive and hybrid Q-switching and mode-locking of solid-state lasers, dye lasers, semiconductor lasers and gas lasers is reviewed. The dynamics of saturable absorbers and reverse saturable absorbers is illustrated. The nanosecond pulse generation by passive and hybrid Q-switching of low-gain active media is described. The picosecond and femtosecond pulse generation by passive and hybrid mode-locking in low-gain and highgain active media is analysed. The performance data of passively and hybridly mode-locked cw femtosecond dye lasers are collected. The pulse shortening of ultra-fast pulses with saturable absorbers in intra-cavity and extra-cavity configurations is discussed. PACS: 42.55The photonic switching of lasers provides an important technique to generate short light pulses in the nanosecond to femtosecond time regime. The photons generated in the laser modify the transmission of the switching elements and cause the formation of short pulses. Saturable absorbers serve as intensity or energy dependent coupling elements in most cases. But occasionally intensity and energy-dependent refractive index changes have been applied. Nanosecond light pulses are generated in passively Q-switched lasers. The passive mode-locking of laser leads to the generation of nanosecond, picosecond or femtosecond pulse trains. The actual pulse durations depend on the spectroscopic data of the active media and of the passive elements.The nonlinear response of absorbers to light radiation is introduced in the next section [1][2][3][4][5][6][7][8][9]. The passive, and the hybrid Q-switching are discussed in . The passive, and the hybrid modelocking are described in Sect. 3. A distinction is made between the mode-locking of low-gain and high-gain active media [35 45]. The simultaneous Qswitching and mode-locking is discussed shortly in Sect. 4. A final section is devoted to the intra-cavity and extra-cavity pulse shortening with saturable absorbers [46][47][48][49][50].

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Section: Pulse Shortening With Saturable Absorbersmentioning

confidence: 99%

“…With the described system Nd:glass laser pulses were shortened to 0.9 ps. In a similar branchedoscillator setup the Nd: glass laser pulses were shortened to 0.4 ps [337]. A ring regenerative amplifier was used in [338] for pulse shortening with saturable absorbers.…”

Section: Pulse Shortening In Master-slave Oscillator Systemsmentioning

confidence: 99%

Passive Q-switching and mode-locking for the generation of nanosecond to femtosecond pulses

Penzkofer

1988

Appl. Phys. B

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“…In passively mode-locked Nd lasers and ruby lasers (small stimulated emission cross-section, no gain dependent pulse shortening) absorption recovery times of some picoseconds are necessary for picosecond pulse generation [7]. Shortening of picosecond pulses to the subpicosecond region may be achieved by passing picosecond pulses through saturable absorbers of some picosecond absorption recovery time [8][9][10]. The radiative S t -S 0 lifetime of dyes is generally between 1 and 10 ns.…”

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Saturable absorbers with concentration-dependent absorption recovery time

Penzkofer

1986

Appl. Phys. B

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Abstract. The ground-state bleaching of highly concentrated rhodamine 6G solutions in methanol is studied with intense picosecond light pulses. The ground-state recovery time changes with concentration from about 3.9 ns at low concentration (10~5 mol/dm 3 ) to about 1 ps at high concentration (0.6 mol/dm 3 ). The shortening of the absorption recovery time is determined by the concentration dependent quenching of the S 1 -state population due to unbound dimers and by the intensity dependent longitudinal and transverse amplified spontaneous emission. 42.65, 42.70, 42.20 The bleaching of absorbing media by intense light pulses is a general phenomenon. The only requirement for reduction of absorption with increasing light signal is that the ground-state absorption cross-section is larger than the excited-state absorption cross-section [1][2][3][4][5]. For laser pulse durations At L short compared to the absorption recovery time z A the bleaching behavior is determined by the input pulse energy density e [6]. At a pulse energy density s s = hv L /

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Generation of subpicosecond pulses by feedback control and frequency tuning of an actively-passively modelocked Nd-glass laser

Korn

Billhardt

Kalashnikov

et al. 1991

Optics Communications

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Subpicosecond pulse generation in a branched passively mode-locked Nd-glass laser

Cited by 5 publications

References 21 publications

Passive Q-switching and mode-locking for the generation of nanosecond to femtosecond pulses

Passive Q-switching and mode-locking for the generation of nanosecond to femtosecond pulses

Saturable absorbers with concentration-dependent absorption recovery time

Generation of subpicosecond pulses by feedback control and frequency tuning of an actively-passively modelocked Nd-glass laser

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