Mid-infrared laser emission from Cr:ZnS channel waveguide fabricated by femtosecond laser helical writing

Peng, Ya-Pei; Zou, Xiao Ping; Bai, Zhengyuan; Leng, Yuxin; Jiang, Benxue; Jiang, Xiongwei; Zhang, Long

doi:10.1038/srep18365

Cited by 21 publications

(4 citation statements)

References 36 publications

(38 reference statements)

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“…The inset images are the cross-sectional view of typical waveguides written using these two scanning geometries, respectively. Using these two scanning geometries, we only obtained high propagation losses (> 2 dB/cm) in BIG, which are similar to the losses typically obtained in other materials with the same writing schemes [24,25,[28][29][30][31]. Moreover, additional coupling losses were unavoidable because the waveguide length could not extend up to the slab facets by several tens of microns due to surface ablation issues.…”

Section: Magnetless Faraday Rotator Waveguide Fabricationsupporting

confidence: 76%

Integrated Magnetless Passive Broadband Faraday Isolator

Lapointe

Coia

Vallée

2023

Preprint

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Optical isolation based on a non-reciprocal effect is crucial for proper operation of several high-performance photonic devices such as LiDAR and quantum platforms. The magneto-optical Faraday rotation is the most commonly used non-reciprocal effect as it offers unique advantages, including broadband operation, wide input optical power range, low insertion losses and high optical isolation, but it is currently not conducive to miniaturization. Two major impediments hinder the direct integration of Faraday isolators into photonic integrated circuits (PICs): the need for bulky external magnets, and the challenging fabrication of low-loss waveguides that would eliminate the need for free-space coupling optics. We have addressed both challenges using a first-of-its-kind femtosecond laser writing technique to create waveguides within the bulk of latched bismuth-doped iron garnet (BIG) slabs without altering its magneto-optic functionality. As a result, we have achieved a magnetless Faraday rotator waveguide exhibiting <0.15 dB insertion loss with a record high figure of merit of 346° dB-1. By interposing this Faraday rotator between two 30 μm-thick polarizers, we further demonstrate an integrated magnetless optical isolator with >25 dB isolation ratio and <1.5 dB insertion loss over the entire optical telecom C-band.

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Section: Magnetless Faraday Rotator Waveguide Fabricationsupporting

confidence: 76%

Integrated Magnetless Passive Broadband Faraday Isolator

Lapointe

Coia

Vallée

2023

Preprint

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“…Proper processing of the facets and structuring of the films to form a channel waveguide is a key to success on this way. Reactive ion etching [47], ridge waveguide formation by photolithography [48], or femtosecond laser writing [7,49] could be implemented to further improve the waveguiding for both the pump and the laser beam thus increasing the pump intensity and reducing the threshold. We have made preliminary experiments with femtosecond laser writing in bulk crystalline ZnS [50] and are moving forward towards using this technology for thin film samples.…”

Section: Potential As a Laser Mediummentioning

confidence: 99%

Spectral-luminescent properties of vapor deposited Cr:ZnS thin films and their application as saturable absorbers for 15-μm erbium lasers

Tolstik

Sorokin

Karhu

et al. 2018

Opt. Mater. Express

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We report the results of the extensive spectral-luminescent characterization including concentration quenching analysis of the first laser-quality vapor-deposited Cr:ZnS films, and demonstrate their use as saturable absorbers. Comparison of spectral-luminescent properties with bulk Cr:ZnS indicates their high laser quality, opening the way towards industrial mid-IR thin-disk and waveguide lasers. Successful implementation of the grown films in a Q-switched Er,Yb:GdAB solid-state laser emitting at 1.52 μm gives clear experimental evidence of the high quality of the films.

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“…Under this condition, the cladding is formed within a single helical inscription process and delivers a continuous and smooth aspect of the cross sections. Up till now, researchers have used this technique to fabricate waveguides in a few optical materials including Cr:ZnS ceramics and Nd:Y 3 Al 5 O 12 (Nd:YAG) polycrystals, revealing that helical inscription enables waveguides with low propagation losses compared with structures realized by classical discrete inscription approach [12,13] .…”

Section: Introductionmentioning

confidence: 99%

Laser emission from low-loss cladding waveguides in Pr:YLF by femtosecond laser helical inscription

et al. 2022

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Depressed cladding waveguides are fabricated in Pr:LiYF 4 (YLF) crystal by femtosecond laser inscription following a helical scheme. With the optimized parameters, the propagation loss of the waveguide is around 0.12 dB/cm for multimode guiding. Under optical pumping with InGaN laser diodes at 444 nm, efficient waveguide lasers in the orange around 604 nm (π-polarized) are achieved with minimum lasing threshold of 119.8 mW, maximum slope efficiency of 16.6%, and maximum output power of 120.6 mW. Benefiting from their optimized performances, the waveguides produced in this work are promising for applications as compact orange laser sources.

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Mid-infrared laser emission from Cr:ZnS channel waveguide fabricated by femtosecond laser helical writing

Cited by 21 publications

References 36 publications

Integrated Magnetless Passive Broadband Faraday Isolator

Integrated Magnetless Passive Broadband Faraday Isolator

Spectral-luminescent properties of vapor deposited Cr:ZnS thin films and their application as saturable absorbers for 15-μm erbium lasers

Laser emission from low-loss cladding waveguides in Pr:YLF by femtosecond laser helical inscription

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