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You are here: Home / Laser Products / Q-Switch Crystal / Passive Q-Switch Crystal / Co:Spinel
Co Spinel passive q switch crystal laser crylink

Co: Spinel

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Co:Spinel (Cobalt-doped magnesium aluminate spinel; Co:MgAl2O4) allows the generation of a short nanosecond pulse with high peak power around the eye-safe wavelength of 1.5um, perfect for telemetry applications. The absorption spectrum of Co2+-doped MgAl2O4 exhibited a broad absorption band in the wavelength range of 1200–1600 nm, which indicated that Co2+ ions substituted for the tetrahedrally coordinated Mg2+ ions in the MgAl2O4 lattice. Passive Q-switching of solid-state lasers with solid-state saturable absorbers is a beautiful Q-switching technique. It allows the development of compact and low-cost laser sources of nano and sub-nanosecond pulses for various applications.

Co:Spinel——saturable absorbers for the passive Q-switching of solid-state lasers operating at an eye-safe wavelength of 1.5 μm

Lasers emitting at 1.5µm are of great interest for several industrial applications. This interest is, first of all, due to the eye safety of 1.5-µm radiation. Other advantages of this wavelength are high transparency in the atmosphere and fused silica waveguides and the availability of sensitive room-temperature light detectors(Ge and InGaAs photodiodes). All this makes 1.5µm lasers very attractive for applications in range-finder, environmental sensing, telecommunications, surgery, etc. Co:Spinel absorption peak is close to 1520nm, primarily used in eye-safe lasers. The absorption cross-section at 1520nm is 3.5×10-19cm2 and at 1331 is 2.8×10-19cm2. It has been reported as a Q-switch crystal for Er,Yb Glass, Nd:GYSGG,Nd:YALO3.

Case
Application
Feature
Reference
News
Case

Co:Spinel for 1535nm Laser Passive Q-Switch
Size:10*10*2.046;
T0=95%;
S1: [email protected]±5nm, S2: [email protected]±5nm, R=92%/ R=95%

Co:Spinel crystal case (2)
Size: 4.2*4.2 (+/-0.2) mm;
Thickness: 1.5 (+/- 0.5);
Initial Transmission: 95% (+/-0.5%);
Coating, S1/S2: AR/[email protected]

Co:Spinel crystal case (3)
Dimensions, mm: Ø6;
Thickness, mm: 1;
Initial transmission: 90 +/-0.5%;
Surface quality, S-D: 20-10

Co:Spinel crystal case (4)
Size: Φ6×1 mm;
End surfaces configuration: Plano/Plano;
Initial transmission: 90 +/-0.5 %

Co:Spinel crystal case (5)
Size: Φ6×1.145 mm;
2-side polishing

Co:Spinel crystal case (6)
Size: 4.3×4.3×(0.8-1.5) mm
T0=92.5±0.1%@1540 nm
2-side polishing

Co:Spinel crystal case (7)
Size: Ø6×1 mm;
Initial transmission: 90 +/-0.5 %

Application

Radar and Ranging
1535nm laser

Medical Applications
1500nm laser

Feature
  • Rare excited absorption
  • High constant of Q-switch
  • High absorption section
  • Long excited lifetime
  • Evenly distributed cobalt
  • Wide absorption band
Reference
Passive shutters for Q-switching continuously diode-pumped Er-glass laser
Proceedings of CAOL 2005. Second International Conference on Advanced Optoelectronics and Lasers, 2005
Optical properties of 3d transition-metal-doped MgAl2O4 spinels
PHYSICAL REVIEW B 76, 075111 2007
Pressure-induced Co2+ photoluminescence quenching in MgAl2O4
PHYSICAL REVIEW B 86, 125123 (2012)
Passive Q-switchlng of 1.34pm neodymium laser using Co:LiGs5O8 and Co:MgAl2O4
Conference Digest. 2000 Conference on Lasers and Electro-Optics Europe (Cat. No.00TH8505)
Nd:GYSGG laser at 1331.6 nm passively Q-switched by a Co:MgAl2O4 crystal
Optical Materials Volume 69, July 2017, Pages 250-253

If you can’t find the Literature you want, Contact us to get the PDF      Get the Literature

Czochralski growth and characterization of MgAl2O4 single crystals
Journal of Crystal Growth Volume 401, 1 September 2014, Pages 844-848
Effect of Co2+ substitution on MgAl2O4 studied by infrared reflectance spectroscopy
Optik Volume 147, October 2017, Pages 180-186
Thermal analysis of a diffusion bonded Er3+,Yb3+:glass/Co2+: MgAl2O4 microchip lasers
Optical Materials Volume 60, October 2016, Pages 546-551
Comparison of laser generation in thermally bonded and unbonded Er3+,Yb3+:glass/Co2+:MgAl2O4 microchip lasers
Optical Materials Volume 46, August 2015, Pages 561-564
Preparation and optical properties of nanoscale MgAl2O4 powders doped with Co2+ ions-
Journal of Non-Crystalline Solids Volume 354, Issue 29, 1 July 2008, Pages 3516-3519
Nonlinear absorption properties of Co2+:MgAl2O4 crystal
Appl. Phys. B 70, 179–184 (2000) / Digital Object Identifier (DOI) 10.1007/s003409900138
Effect of Co2+ Ions Doping on the Structural and Optical Properties of Magnesium Aluminate
Journal of ELECTRONIC MATERIALS, Vol. 46, No. 7, 2017
Optimized diode-pumped passive Q-switched ytterbium–erbium glass laser
Appl Phys B (2012) 108:283–288 DOI 10.1007/s00340-012-5036-3
Passive Q-switching at 1.54 μm of an Er–Yb: GdCa4O(BO3)3 laser with a Co2+: MgAl2O4 saturable absorber
Appl. Phys. B 81, 49–52 (2005)
Spectroscopy, continuous-wave and Q-switched diode-pumped laser operation of Er3+,Yb3+:YVO4 crystal
Appl.Phys.B86,275–278(2007)
Monolithic thermally bonded Er3+, Yb3+:glass/Co2+:MgAl2O4 microchip lasers
Optics Communications Volume 356, 1 December 2015, Pages 166-169
Absorption and photoluminescence characteristics of Co2+:MgAl2O4 nanocrystals embedded in sol–gel derived SiO2-based glass
Optical Materials Volume 25, Issue 1, February 2004, Pages 65-69
Passive Q-switching at 1645 nm of Er:YAG Laser with Co:MALO Saturable Absorber
IQEC/CLEO Pacific Rim 2011 ● 28 August – 1 September 2011 ● Sydney, Australia
Optimizationof passively Q-switched Er:Yb:Cr:phosphateglass laser: theoretical analysis and experimental results
Appl.Phys.B86,293–301(2007)
Pulse energy optimizationof passively Q-switched flash-lamp pumped Er:glass laser
Appl.Phys.B75,35–39(2002)
News

Methods and Processes of Co doped Spinel Crystal Growth – 2020/10/20 – CRYLINK

Parameter

Physical and Chemical Properties
PropertyValue
Chemical formulaCo2+:MgAl2O4
Crystal structureCubic
Lattice parameters8.07Å
Density3.62 g/cm3
Melting Point2105°C
Refractive Indexn=1.6948 @1.54 μm
Thermal Conductivity/(W·cm-1·K-1@25°C)0.033W
Thermal Expansion /(10-6 /°[email protected]°C )1.046
Specific Heat/ (J·g-1·K-1)5.9
Hardness (Mohs)8.2
Extinction Ratio25dB
Orientation[100] or [111] < ±0.5°
Optical density0.1-0.9
Damage Threshold>500 MW/cm2
Doping concentration of Co2+0.01-0.3 atm%
Metarial and Specifications
PropertyValue
Concentrations(0.05~0.35) wt%
Absorption coefficient0 ~ 7 cm-1
Ground-state absorption cross-section GSA(E-19 cm2)2.8(±0.4)@1340nm
Excited state absorption cross-section ESA(E-20 cm2)2.0(±0.6)@1340nm
Ground-state absorption cross-section GSA(E-20 cm2)3.5(±0.4)@1540nm
Excited state absorption cross-section ESA(E-20 cm2)1.0(±0.6)@1540nm
Working wavelength1200 – 1600 nm
End ConfigurationFlat/Flat
Figure of Merit(FOM)100~300
CoatingsAR/[email protected],R<0.2%;
AR/[email protected],R<0.2%
Absorption Spectrum
Co,MgAl2O4 Crystal Absorption SpectrumCo,MgAl2O4-Crystal-Absorption-Spectrum
Transmission Spectrum
Co,MgAl2O4-Crystal--Transmission 

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