15 W Single Frequency Optically Pumped Semiconductor Laser With Sub-Megahertz Linewidth

Laurain, Alexandre; Mart, Cody; Hader, J.; Moloney, Jerome V.; Kunert, Bernardette; Stolz, W.

doi:10.1109/lpt.2013.2290062

Cited by 37 publications

(16 citation statements)

References 12 publications

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“…The wavelength flexible vertical external-cavity surface-emitting laser (VECSEL) has been a popular subject in recent research [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Two main applications have been continuous-wave (CW) operation and mode-locked pulse generation.…”

Section: Introductionmentioning

confidence: 99%

“…CW lasers have been optimized for maximal output power. So far, up to 106 W has been reached using multimode operation [6,7] and 15 W in single frequency operation [14]. At the same time, stable modelocked pulses have been found using semiconductor external saturable absorber mirrors (SESAMs) [1,2,4,8,9], graphene and carbon nanotube saturable absorbers [10][11][12], and integrated quantum well (QW) and quantum dot saturable absorbers [10].…”

Section: Introductionmentioning

confidence: 99%

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Non-equilibrium ultrashort pulse generation strategies in VECSELs

Kilen

Koch

Hader

et al. 2017

Optica

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Vertical external cavity surface emitting lasers are ideal testbeds for studying nonlinear many-body systems driven far from equilibrium. The classical laser gain picture fails, however, when a high peak intensity optical pulse of duration shorter than the intrinsic carrier scattering time interacts with electrons in the conduction and holes in the valence band, and the non-equilibrium carrier distributions cannot recover during the presence of the exciting pulse. We present the optimization of ultrashort mode-locked pulses in a vertical external cavity surface emitting laser cavity with a saturable absorber mirror by modelling non-equilibrium quantum dynamics of the electron-hole excitations in the semiconductor quantum-well gain and absorber medium via the semiconductor Bloch equations and treating the field propagation at the level of Maxwell's wave equation. We introduce a systematic design that predicts the generation of stable mode-locked pulses of duration less than twenty femtoseconds. This factor of five improvement is of interest for mode-locking and ultrafast semiconductor dynamics applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-equilibrium ultrashort pulse generation strategies in VECSELs

Kilen

Koch

Hader

et al. 2017

Optica

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show abstract

“…Applications have been diverse, ranging from stable 107 fs mode locked pulsed operation to continuous-wave (CW) operation with powers up to 106 W. 6,7,14 In VECSEL cavities mode locking has been achieved using semiconductor external saturable absorber mirrors (SESAMs), graphene saturable absorbers, carbon nanotube saturable absorbers, integrated quantum well (QW) and quantum dot saturable absorbers. 1,2,4,[8][9][10][10][11][12] Currently, the shortest achived mode locked pulses are 107 fs pulses 13 that were compressed down to 96 fs, 15 and a train of 60 fs pulses inside a picosecond envelope.…”

Section: -15mentioning

confidence: 99%

Non-equilibrium effects in VECSELs

et al. 2017

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A systematic study of microscopic many-body dynamics is used to analyze a strategy for how to generate ultrashort mode locked pulses in the vertical external-cavity surface-emitting lasers with a saturable absorber mirror. The field propagation is simulated using Maxwell's equations and is coupled to the polarization from the quantum wells using the semiconductor Bloch equations. Simulations on the level of second Born-Markov are used to fit coefficients for microscopic higher order correlation effects such as dephasing of the polarization, carrier-carrier scattering and carrier relaxation. We numerically examine recent published experimental results on mode locked pulses, as well as the self phase modulation in the gain chip and SESAM.

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“…First, the high finesse of the external optical cavity can provide a high power circular beam with a very low divergence, close to the diffraction limit. 1 A high beam quality is particularly important for non linear applications, such as supercontinuum or frequency comb generation 2 where an efficient coupling into a non linear medium (single mode fiber, semiconductor waveguide, etc) is necessary. It is also very important for applications requiring high power density such as multi-photon imaging, 3 or material processing.…”

Section: Introductionmentioning

confidence: 99%

High power sub-200fs pulse generation from a colliding pulse modelocked VECSEL

Laurain

Marah

Rockmore

et al. 2017

Vertical External Cavity Surface Emitting Lasers (VECSELs) VII

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We present a passive and robust mode-locking scheme for a Vertical External Cavity Surface Emitting Laser (VECSEL). We placed the semiconductor gain medium and the semiconductor saturable absorber mirror (SESAM) strategically in a ring cavity to provide a stable colliding pulse operation. With this cavity geometry, the two counter propagating pulses synchronize on the SESAM to saturate the absorber together. This minimizes the energy lost and creates a transient carrier grating due to the interference of the two beams. The interaction of the two counter-propagating pulses in the SESAM is shown to extend the range of the modelocking regime and to enable higher output power when compared to the conventional VECSEL cavity geometry. In this configuration, we demonstrate a pulse duration of 195fs with an average power of 225mW per output beam at a repetition rate of 2.2GHz, giving a peak power of 460W per beam. The remarkable robustness of the modelocking regime is discussed and a rigorous pulse characterization is presented.

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15 W Single Frequency Optically Pumped Semiconductor Laser With Sub-Megahertz Linewidth

Cited by 37 publications

References 12 publications

Non-equilibrium ultrashort pulse generation strategies in VECSELs

Non-equilibrium ultrashort pulse generation strategies in VECSELs

Non-equilibrium effects in VECSELs

High power sub-200fs pulse generation from a colliding pulse modelocked VECSEL

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