Three-element, self-starting Kerr-lens-modelocked 1-GHz Ti:sapphire oscillator pumped by a single laser diode

Ostapenko, Hanna; Mitchell, Toby; Castro-Marín, Pablo; Reid, Derryck T.

doi:10.1364/oe.472533

“…2(a) and 2(b) by the vertical blue line. In this condition, the mode area reduces by around 10% when the laser transitions from cw to Kerr-lens-modelocked operation [16]. In Figs.…”

Section: Abcd Resonator Model For Optimised Kerr-lens Modelockingmentioning

confidence: 87%

Design, construction and characterisation of a diode-pumped, three-element, 1-GHz Kerr-lens-modelocked Ti:sapphire oscillator

Ostapenko¹,

Mitchell²,

Castro-Marín³

et al. 2022

Preprint

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We report a 1-GHz repetition rate Ti:sapphire laser pumped with a single green pump diode, producing 111-fs pulses and exhibiting self-starting Kerr-lens modelocking at pump powers above 850 mW. At 1.1W of pump power, the average output of the laser is over 116 mW, and the slope efficiency of the laser is measured to be 13%. The optimisation of the cavity dispersion has demonstrated a possible shortening of the pulses up to 87 fs with an average power of 108 mW. The relative intensity noise of the laser was measured to be 0.06%, and the phase error of the repetition rate after locking to a reference has been measured to be 1.7 mrad, corresponding to timing jitter of 270 fs.

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“…Many multi-GHz repetition rate lasers, such as mode-locked edge-emitting semiconductor lasers [21][22][23], vertical external cavity surface-emitting semiconductor lasers [24][25][26] and some mode-locked solid-state lasers [27][28][29] have standing wave resonators where the gain medium extends to at least one of the resonator mirrors. If these lasers emit cw radiation, they can exhibit a spectral bandwidth of several nanometers due to strong spatial hole burning.…”

Section: Introductionmentioning

confidence: 99%

A pitfall in autocorrelation measurements of laser radiation

Fiehler,

Saraceno,

Steinmeyer

et al. 2024

Preprint

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Spectrally broad laser radiation from continuous wave (cw) lasers can exhibit second-order autocorrelation traces virtually indistinguishable from those of mode-locked lasers. Consequently, based only on autocorrelations, one might erroneously conclude that a cw laser is mode-locked. Such misinterpretations can be avoided by carefully characterizing radio frequency transients and spectra. However, optoelectronics are often too slow for lasers with an axial mode spacing in the multi-GHz range. Carefully evaluated autocorrelations then remain the last resort for validating mode locking. We compare autocorrelation measurements and calculations of a mode-locked titanium-sapphire (Ti:Sa) laser and a spectrally broad monolithic cw Ti:Sa laser to illustrate the ambiguity of optical autocorrelation.

show abstract

“…Many multi-GHz repetition rate lasers, such as mode-locked edge-emitting semiconductor lasers [21][22][23], vertical external cavity surface-emitting semiconductor lasers [24][25][26] and some mode-locked solid-state lasers [27][28][29] have standing wave resonators where the gain medium extends to at least one of the resonator mirrors. If these lasers emit cw radiation, they can exhibit a spectral bandwidth of several nanometers due to strong spatial hole burning.…”

Section: Introductionmentioning

confidence: 99%

A pitfall in autocorrelation measurements of laser radiation

Fiehler,

Saraceno,

Steinmeyer

et al. 2024

Preprint

0

View full text Add to dashboard Cite

Spectrally broad laser radiation from continuous wave (cw) lasers can exhibit second-order autocorrelation traces virtually indistinguishable from those of mode-locked lasers. Consequently, based only on autocorrelations, one might erroneously conclude that a cw laser is mode-locked. Such misinterpretations can be avoided by carefully characterizing radio frequency transients and spectra. However, optoelectronics are often too slow for lasers with an axial mode spacing in the multi-GHz range. Carefully evaluated autocorrelations then remain the last resort for validating mode locking. We compare autocorrelation measurements and calculations of a mode-locked titanium-sapphire (Ti:Sa) laser and a spectrally broad monolithic cw Ti:Sa laser to illustrate the ambiguity of optical autocorrelation.

show abstract

Three-element, self-starting Kerr-lens-modelocked 1-GHz Ti:sapphire oscillator pumped by a single laser diode

Cited by 12 publications

References 10 publications

Design, construction and characterisation of a diode-pumped, three-element, 1-GHz Kerr-lens-modelocked Ti:sapphire oscillator

Design, construction and characterisation of a diode-pumped, three-element, 1-GHz Kerr-lens-modelocked Ti:sapphire oscillator

A pitfall in autocorrelation measurements of laser radiation

A pitfall in autocorrelation measurements of laser radiation

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