Broadband Semiconductor Mirrors with a Small Relaxation Time for Passive Mode-Locking of NIR Lasers

Рубцова, Н. Н.; Borisov, G. M.; Goldort, V. G.; Kovalyov, A. A.; Ledovskikh, D. V.; Преображенский, В. В.; Putyato, М. А.; Semyagin, B. R.

doi:10.3103/s8756699019050030

Cited by 3 publications

(2 citation statements)

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“…The DSAM samples are characterized by approximately a double width of the reflective 'table' compared with the width of the SESAM reflection spectrum [5]. A DSAM is significantly cheaper and does not show the noticeable lateral spread of characteristics which is typical of MBE-grown SESAMs.…”

Section: Dsam Designmentioning

confidence: 99%

“…According to the measurements of the kinetics of bleaching and restoration of linear absorption [5], the following relaxation times were found: the ionization time of excitons localized in quantum wells τ 1 = 0.4 ps (sometimes called the 'short' relaxation time); the time to establish the electron-hole pair quasi-equilibrium τ 3 = 0.8 ps; the electron-hole recombination time τ 2 = 2 ÷ 3 ps (sometimes called the 'long' relaxation time). The last relaxation time determines the ability of the mirror with a fast saturable absorption operation.…”

Section: Kinetics Of Shuttersmentioning

confidence: 99%

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Optical shutters for a compact femtosecond Yb:KYW laser

et al. 2019

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A stable passive mode-locking regime for a Yb 3+ :KY(WO 4 ) 2 laser with optical pumping by a continuous diode laser was obtained using two types of optical shutter with a saturable absorber based on coupled GaAs/In 0.25 Ga 0.75 As/GaAs quantum wells. The shutters differed in their reflecting part: the first type was a semiconductor mirror and the second type was a dielectric one. The typical parameters of the mode-locking regime were as follows: a pulse duration of about 200 fs for both types of shutter, an average power of 2.54 W for the allsemiconductor shutter (SESAM) and 0.92 W for the dielectric mirror with a saturable absorber (DSAM). The efficiency relative to the incident pump power was 57% for the SESAM and 19% for the DSAM. The maximum pulse repetition rate was 982 MHz. The measured recovery time was about 2 ps for both saturable absorbers. The mirror damage threshold estimate for the SESAM was at least 8.87 mJ cm −2 .

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Section: Dsam Designmentioning

confidence: 99%

Section: Kinetics Of Shuttersmentioning

confidence: 99%