Tag Archives: SPIE

Thermal management optimization in high-power 3D sensing VCSELs

March 4, 2022 by Modulight Content
No comments
Published in: SPIE LASE 2022 Authors: A. Filipchuk, K. Nechay, R. Ulkuniemi, S. Talmila, P. Uusimaa  Published in: SPIE LASE 2022 Authors: A. Filipchuk, K. Nechay, R. Ulkuniemi, S. Talmila, P. Uusimaa Vertical-cavity surface-emitting lasers (VCSELs) have recently paved their way into the 3D sensing market, specifically in mobile device applications. Vertical emission of VCSELs enables arranging single emitters into high-power 2D arrays. Thus, VCSEL arrays require efficient heat management which can be implemented by the means of packaging, both to improve thermal conductivity and to keep VCSEL chips intact. This becomes particularly important when considering also very high-density laser arrays and 2D matrices for quantum Continue reading →

High-power individually addressable visible and MID-IR laser arrays for display and other applications

March 4, 2022 by Modulight Content
No comments
Published in: SPIE LASE 2022 Authors: Riina Ulkuniemi, Ilpo Suominen, Ville Vilokkinen, Jari Sillanpää, Petteri Uusimaa  Published in: SPIE LASE 2022 Authors: Riina Ulkuniemi, Ilpo Suominen, Ville Vilokkinen, Jari Sillanpää, Petteri Uusimaa Individually addressable laser diode arrays (IABs) have been successfully demonstrated first time in the 90’s. The main commercial success area has been the printing industry and more recently digital press. These laser arrays are typically working at 8xx nm and 9xx nm wavelengths1,2 . Individually addressable laser diode arrays operating in visible region has also been reported3,4. There is an increasing interest in different variants of individual addressable arrays not Continue reading →

High-density single-mode laser arrays for quantum systems

March 1, 2022 by Modulight Content
No comments
Published in: SPIE OPTO 2022 Authors: Riina Ulkuniemi, Petri Melanen, Jari Nikkinen, Jari Ovaskainen, Petteri Uusimaa  Published in: SPIE OPTO 2022 Authors: Riina Ulkuniemi, Petri Melanen, Jari Nikkinen, Jari Ovaskainen, Petteri Uusimaa Quantum systems have highly variable requirements and tailored solutions depending on the technology. For instance, lasers are used for quantum control of particles or molecules and excitation for quantum systems. For the latter purpose, suitable applications are frequency comb generation, timing sources for picosecond pulses, and single photon emitters. Key performance parameters for lasers used in this area are single-mode operation, narrow linewidth, and frequency stability. Wavelength of the lasers Continue reading →

Eye-safe laser illuminators for long-reach LIDAR and gated imaging in harsh weather conditions

March 5, 2021 by Modulight Content
No comments
Published in: SPIE LASE 2021 Authors: Lasse Orsila, Visa Kaivosoja, Petri Melanen, Petteri Uusimaa  Published in: SPIE LASE 2021 Authors: Lasse Orsila, Visa Kaivosoja, Petri Melanen, Petteri Uusimaa Autonomous driving and automated ships are in increasing demand and the performance for pattern recognition and safety functions are essential. Harsh weather conditions lower the atmospheric transmission for useable eye-safe wavelengths and water vapor peaks prevent most laser light propagation for longer distances. In LIDAR application this problem can be solved with increased peak power. However, high peak power solutions with high repetition rate do not exist or they are bulky and Continue reading →

High temperature AlGaInAs-based 25g DML-DFB lasers operating in O-band for data center use

March 5, 2021 by Modulight Content
No comments
Published in: SPIE OPTO 2021 Authors: Antti Saarela, Petri Melanen, Ville Vilokkinen, Luukas Kuusela, Petteri Uusimaa, Pekko Sipilä, Riina Ulkuniemi, Ossi Mäkinen  Published in: SPIE OPTO 2021 Authors: Antti Saarela, Petri Melanen, Ville Vilokkinen, Luukas Kuusela, Petteri Uusimaa, Pekko Sipilä, Riina Ulkuniemi, Ossi Mäkinen Hyperscale datacenters are driving the growth of datacom laser diode market. Small wavelength drift over temperature, small footprint and low power consumption makes directly modulated distributed feedback (DFB) lasers ideal for uncooled operation in intra-datacenter interconnects. DFB lasers require significantly less process steps than electro absorption modulated lasers (EMLs), used typically for higher speeds and longer distances. AlGaInAs-based lasers are exceptionally desirable for uncooled operation compared to InGaAsP because of the Continue reading →

Long-range all-solid-state flash LiDAR sensor for autonomous driving

March 5, 2021 by Modulight Content
No comments
Published in: SPIE LASE 2021 Authors: Juha Lemmetti, Niklas Sorri, Ilkka Kallioniemi, Petri Melanen, Petteri Uusimaa  Published in: SPIE LASE 2021 Authors: Juha Lemmetti, Niklas Sorri, Ilkka Kallioniemi, Petri Melanen, Petteri Uusimaa LiDAR sensors have gathered lot of interest in the field of autonomous driving. Still, the offering of mass-produced, small form-factor all-solid-state LiDAR sensors remain scarce. Furthermore, most of the sensor applications are currently designed for short-range (<50 feet) and medium-range (50-300 feet) applications. There’s a requirement for an efficient solution for long range LiDAR sensor that can be used to monitor the road in front of the vehicle. It must Continue reading →

High-efficiency vertically-emitting chipsets for 3D and proximity sensing

March 5, 2021 by Modulight Content
No comments
Published in: SPIE LASE 2021 Authors: K. Nechay, R. Ulkuniemi, A. Filipchuk, T. Hartikainen, V. Kaivosoja, R. Hietikko, J. Nikkinen, J. Sillanpaa, P. Melanen, V. Vilokkinen, S. Talmila, P. Uusimaa  Published in: SPIE LASE 2021 Authors: K. Nechay, R. Ulkuniemi, A. Filipchuk, T. Hartikainen, V. Kaivosoja, R. Hietikko, J. Nikkinen, J. Sillanpaa, P. Melanen, V. Vilokkinen, S. Talmila, P. Uusimaa Vertical-cavity surface-emitting lasers (VCSELs) have just recently started generating a lot of interest as the illumination source in the multitude of commercial applications. VCSELs capability to provide narrow spectrum emission with low temperature sensitivity and high beam quality, coupled with the possibility of nanosecond pulses generation, makes VCSELs an excellent laser platform for the outdoors, high-precision Continue reading →

Configurable automated well plate illuminator for in vitro research in drug discovery and optogenetics

March 5, 2021 by Modulight Content
No comments
Presented in: SPIE BIOS 2021 Authors: Elias Kokko, Robert Perttilä, Lasse Orsila, Zoe Ylöniemi, Johannes Kivelä, Petteri Uusimaa    Presented in: SPIE BIOS 2021 Authors: Elias Kokko, Robert Perttilä, Lasse Orsila, Zoe Ylöniemi, Johannes Kivelä, Petteri Uusimaa There is a demand for a robust and flexible illumination and screening instrument for preclinical light-sensitive drug development and optogenetic research. While there is a great selection of different types of commercial plate readers available on the market, these instruments do not provide enough versatility for high-throughput illumination experiments. In addition, plate readers typically utilize xenon flash lamps or LEDs for sample analysis, which have wider spectral output and lower excitation powers Continue reading →

Individually addressable visible laser arrays for display and printing applications

March 5, 2021 by Modulight Content
No comments
Published in: SPIE LASE 2021 Authors: Riina Ulkuniemi, Ville Vilokkinen, Ilpo Suominen, Soile Talmila, Jari Sillanpää, Petteri Uusimaa  Published in: SPIE LASE 2021 Authors: Riina Ulkuniemi, Ville Vilokkinen, Ilpo Suominen, Soile Talmila, Jari Sillanpää, Petteri Uusimaa Individually addressable laser diode arrays (IABs) are commercially demonstrated in the printing industry. These laser arrays are typically working at 8xx nm and 9xx nm wavelengths. Individually addressable laser diode arrays operating in visible region has been less reported and especially with limited commercial success. Yet, there is increasing interest in different variants of visible laser arrays not only in printing industry, but also in various display applications Continue reading →

High-efficiency and reliable pump lasers for fiber lasers

March 5, 2021 by Modulight Content
No comments
Published in: SPIE LASE 2021 Authors: Jari Nikkinen, Soile Talmila, Ville Vilokkinen, Petri Melanen, Antti Saarela, Lasse Orsila, Jari Sillanpää, Petteri Uusimaa, Seppo Orsila  Published in: SPIE LASE 2021 Authors: Jari Nikkinen, Soile Talmila, Ville Vilokkinen, Petri Melanen, Antti Saarela, Lasse Orsila, Jari Sillanpää, Petteri Uusimaa, Seppo Orsila The demand for fiber lasers has increased due to widening of application areas and higher power levels. As fiber lasers have become the main workhorse for high power material processing applications and competition among fiber laser manufacturers have become more evident, the laser manufacturers are in the process to find ways to lower overall cost of ownership to become more competitive. Key Continue reading →