Generation and applications of passively mode-locked picosecond light pulses

Laubereau, A.; Kaiser, W.

doi:10.1007/bf01421987

Cited by 70 publications

(23 citation statements)

References 81 publications

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“…In our experiments, we used a mode-locked Ndglass laser [5]. A single* picosecond light pulse was selected from the early part of the pulse train by an electro-optical shutter.…”

Section: Received 24 October 1975mentioning

confidence: 99%

Three-photon absorption and subsequent excited-state absorption in CdS

Penzkofer

Falkenstein

1976

Optics Communications

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The nonlinear absorption of single picosecond light pulses (A « 1.06 ßtn) in CdS is investigated at very high light intensities. Three-photon absorption and subsequent excited-state absorption of the generated electrons and holes explain the rapid decrease of transmission with increasing intensity. A three-photon absorption cross-section of -(2 ± 0.5) X 10~8 0 cm 6 $' and an average excited state absorption cross-section of o ex = (7 ± 3) X 10" 18 cm 2 was determined.

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“…In our experiments, we used a mode-locked Ndglass laser [5]. A single* picosecond light pulse was selected from the early part of the pulse train by an electro-optical shutter.…”

Section: Received 24 October 1975mentioning

confidence: 99%

Three-photon absorption and subsequent excited-state absorption in CdS

Penzkofer

Falkenstein

1976

Optics Communications

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“…In passively mode-locked Nd-phosphate glass lasers nearly bandwidth limited pulses of 5 to 7 ps duration are generated in the rising part of the pulse train [1][2][3][4]. The spectral width of the pulses (A?…”

Section: Introductionmentioning

confidence: 99%

Intra-cavity pulse compression in passively mode-locked Nd-glass lasers

Schmidt¹,

Reil²,

Penzkofer³

1986

Optics Communications

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The spectral gain width of a passively mode-locked Nd-phosphate glass laser is reduced with a birefringent filter, and towards the end of the pulse train self-phase modulated pulses are temporally compressed by the restricted gain width. Short pulses upon broad pedestals are formed. The wings are reduced by passing the pulses through an external saturable absorber. Under favorable conditions the pulse durations are shortened from about 7 ps to about 1.5 ps.

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“…Pulse shortening occurs in the saturable absorber cell. (For reviews on mode-locking see [1][2][3][4][5][6][7].) The natural mode selection in the active medium acts against the shortening.…”

mentioning

confidence: 99%

Analysis of temporal pulse development in passively mode-locked lasers

1984

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Abstract. Pulse-shortening and pulse broadening effects in passively mode-locked lasers are analysed. A steady-state pulse duration limit is calculated and compared with round-trip simulations. The numerical calculations apply to a picosecond Nd: glass laser. Methods of short-pulse generation are discussed. 42.55R, 42.60D, 42.65 In passively mode-locked pulsed lasers the statistical spontaneous emission bursts have a duration approximately equal to the inverse of the fluorescence linewidth. In the linear laser phase (constant dye absorption) the finite spectral gain profile of the active medium narrows the spectral width and broadens the duration of the circulating spikes. In the nonlinear laser phase (nonlinear dye transmission, mode-locking region) the most intense spike is preferentially amplified and strong background discrimination is achieved. Pulse shortening occurs in the saturable absorber cell. (For reviews on mode-locking see [1][2][3][4][5][6][7].) The natural mode selection in the active medium acts against the shortening. Intensity dependent loss mechanisms like two-photon absorption in Nd: glass rods [8] broaden the pulse duration at high laser intensities [9]. In this paper we analyse the pulse shortening and pulse broadening effects in passively mode-locked lasers. Intensity-dependent stationary pulse durations are found by equating pulse shortening and pulse broadening per round-trip in the laser oscillator. In the mode-locking region the transient temporal development of a picosecond pulse with constant background level is simulated and the approach to the stationary situation is studied. The theory presented applies to all passively modelocked lasers, either pulsed or continuously working [10]. The numerical calculations in this paper apply to a passively mode-locked Nd: glass laser. The calculations reveal conditions for optimum shortpulse generation in the oscillator. Preliminary measurements with a Pockels cell intensity limiter in the resonator led to pulse shortening in agreement with the theory. PACS: Stationary Pulse DurationsThe changes of pulse duration per round-trip in the oscillator are analysed. Pulses are broadened by the finite spectral width of the gain and by intensity dependent nonlinear losses. Here pulse broadening by two-photon absorption in Nd: glass rods is discussed. Pulse shortening occurs in the nonlinear transmission region of the saturable absorber. The pulse duration ratio f$ = At L0 /At Lb where At L0 is the pulse duration after n +1 round-trips and At Li the pulse duration after n round-trips, is given byj8 GAIN is the ratio of pulse broadening by the finite spectral width of the gain profile. /J XPA represents the ratio of pulse broadening by two-photon absorption in the active medium. /J DYE is the pulse shortening ratio of the saturable dye.The spectral gain profile of the active medium approximately has the form [9]

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Generation and applications of passively mode-locked picosecond light pulses

Cited by 70 publications

References 81 publications

Three-photon absorption and subsequent excited-state absorption in CdS

Three-photon absorption and subsequent excited-state absorption in CdS

Intra-cavity pulse compression in passively mode-locked Nd-glass lasers

Analysis of temporal pulse development in passively mode-locked lasers

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