A5092564759- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Advanced Semiconductor Detectors and Materials
- Analytical Chemistry and Sensors
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Quantum Chemical Studies
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Laser Applications
- Advanced Chemical Physics Studies
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Advanced Biosensing Techniques and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Fiber Optic Sensors
- Advanced Optical Sensing Technologies
Tampere University
2023-2024
ETH Zurich
2023-2024
<p dir="ltr">Semiconductor Saturable Absorber Mirrors (SESAMs) have revolutionized the ultrafast laser industry. While SESAMs are well-established in near-infrared regime, using GaAs-wafer epitaxy, there is an increasing interest for short-wave infrared (SWIR) which can be fabricated GaSb material system. Compared to GaAs-based SESAMs, nonlinear response of absorbers has been reported exhibit inherent and a different interplay between time fabrication process. Here we report new...
<p dir="ltr">Semiconductor Saturable Absorber Mirrors (SESAMs) have revolutionized the ultrafast laser industry. While SESAMs are well-established in near-infrared regime, using GaAs-wafer epitaxy, there is an increasing interest for short-wave infrared (SWIR) which can be fabricated GaSb material system. Compared to GaAs-based SESAMs, nonlinear response of absorbers has been reported exhibit inherent and a different interplay between time fabrication process. Here we report new...
Dual-comb lasers are a new class of ultrafast that enable fast, accurate and sensitive measurements without any mechanical delay lines. Here, we demonstrate 2-µm laser called MIXSEL (Modelocked Integrated eXternal-cavity Surface Emitting Laser), based on an optically pumped passively modelocked semiconductor thin disk laser. Using III-V molecular beam epitaxy, achieve center wavelength in the shortwave infrared (SWIR) range by integrating InGaSb quantum well gain saturable absorber layers...
We introduce the first diode-pumped GaSb-based semiconductor membrane laser with a continuous wave (cw) output power of 1.5 W at center wavelength <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2.08~\mu \text{m}$ </tex-math></inline-formula> an optical-to-optical efficiency 11.7 % and thermal resistance 0.74 K/W. It features broad tunability over 117 nm, achieved using 3-mm birefringent quartz crystal in...
Attosecond noncollinear four-wave-mixing spectroscopy with one attosecond extreme ultraviolet (XUV) pulse and two few-cycle near-infrared (NIR) pulses was used to measure the autoionization decay lifetimes of inner valence electronic excitations in neon atoms. After a 43--48-eV XUV photon excites $2s$ electron into $2s2{p}^{6}\phantom{\rule{0.16em}{0ex}}(np)$ Rydberg series, broadband NIR couple $2s2{p}^{6}3p$ XUV-bright state neighboring $2s2{p}^{6}3s$ $2s2{p}^{6}3d$ XUV-dark states....
There is significant interest in developing high-power lasers with excellent beam quality and tunable wavelength the Short-Wave Infrared (SWIR) to mid-infrared range. Type-II Quantum Well (QW) VECSELs have been demonstrated GaAs material system. However, their true potential lies suppressing Auger recombination at wavelengths beyond 2.3 μm GaSb system where type-I QWs face increasing challenges. Therefore, our research focuses on investigating type-II QW configurations extend emission of...
Passively modelocked, optically pumped semiconductor disk lasers, commonly referred to as VECSELs or MIXSELs, offer a unique combination of wavelength versatility, wafer scalability, high beam quality, and substantial average output power. While V-shaped cavities are typically used for SESAM-modelocked VECSELs, MIXSELs utilize simplified straight cavity, integrating the saturable absorber into VECSEL chip. Here, we demonstrate dual-comb modelocked MIXSEL in Short-Wave Infrared (SWIR) regime,...
SESAMs (Semiconductor Saturable Absorber Mirrors) are crucial in ultrafast laser systems and have been extensively used the near-infrared region. Extending them to short-wave infrared (SWIR) regime is essential for many sensing spectroscopic applications. This investigation examines how wavelength, strain, barrier material affect SWIR SESAM performance. At 2 μm, with InGaSb quantum wells GaSb barriers demonstrate fast recovery times (⪅30 ps) due defect states confined wells. However, using...
We present the first diode-pumped GaSb-based MECSEL, directly bonded onto a SiC heatspreader, operating at 2080 nm. A continuous-wave output power of 1.5 W and up-to-date lowest thermal resistance 0.74 K/W is achieved.
We present the first modelocked, backside-cooled InGaSb-MIXSEL operating at 2035 nm, producing fundamentally modelocked pulses of 1.5 ps with average output power up to 27 mW 3.9 GHz repetition rate.
Passively modelocked, optically pumped semiconductor disk lasers also referred to as VECSELs or MIXSELs combine the wavelength versatility and wafer scalability of semiconductors, together with a high beam quality vertical emitters good average output power [1], [2]. Typically, V-shaped cavity is used for SESAM-modelocked VECSELs. This simplified straight linear MIXSELs, which SESAM integrated into VECSEL chip.
In this invited talk we present several milestone results that highlight the abilities of our dual-comb MIXSEL technology in long-wavelength regime.
Attosecond noncollinear four wave mixing spectroscopy with one attosecond extreme ultraviolet (XUV) pulse and two few-cycle near-infrared (NIR) pulses was used to measure the autoionization decay lifetimes of inner valence electronic excitations in neon atoms. After a 43-48 eV XUV photon excites 2s electron into 2s2p6[np] Rydberg series, broadband NIR couple 2s2p6[3p] XUV-bright state neighboring 2s2p6[3s] 2s2p6[3d] XUV-dark states. Controllable delays or both respect reveal temporal...