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Yb:CALGO Laser Crystal

22 May 2019

Description

Yb:CaGdAlO4 (Yb:CALGO)- Yb doped crystals for high power and ultrashort(femtosecond) lasers

Yb-doped CaGdAlO4 crystal (Yb:CALGO) is now recognized to exhibit outstanding properties for the production of high-power and ultra-short laser pulses. It has the broad and smooth emission bandwidth to generate very short pulses (

Yb3+:CaGdAlO4 has been recently demonstrated to be very interesting for the development of diode–pumped short-pulsed modelocked lasers. Compared with Ti: Sapphire crystal(the choice for the development of ultrashort laser system producing very short and powerful pulses using the Chirped Pulse Amplification technique,Since the beginning of the 90’s),Yb:CALGO can be directly pumped by very efficient and high power semiconductor laser.( Titanium Sapphire crystal pumped by green laser)

 

Parameter

Material and Specifications

Doping Concentration 1-10%
Parallelism 10〞
Perpendicularity 10ˊ
Surface Quality 20/10
Surface Flatness <λ/10@632.8nm
Clear Aperture >90%
Chamfer 0.1mm@45°
Thickness/Diameter Tolerance ±0.05 mm

Physical and Chemical Properties

Formula Yb:CaGdAlO4  (Yb:CALGO)
Crystal Structure Tetragonal K2NiF4 type structure
Melting Point 1840°C
Thermal Conductivity/(W·m-1·K-1) 11.4(undoped)
6.3(2% Yb:CALGO)
5(5% Yb:CALGO)
Thermal Shock Resistance(W.m-1/2) >4.5
Thermal Expansion /(10-6·K-1 ) 35

Optical and Spectral Properties

Emission band width* (FWHM) (nm) 80
Emission Wavelength(nm) 1018-1052
Minimum theoretical
duration (fs)
14
Central emi
ssion peak (nm)
1050
Absorption
(usual pumping) (nm)
980
Emission
cross section(10-20 cm2)
0.8
Fluorescence
lifetime (μs)
420
σem τ(μscm2) 336
Quantum Defect <0.8%

Main properties of laser materials involved in the development of femtosecond lasers

Material  Emission band
width(FWHM) (nm)
Minimum theoretical
duration (fs)
Central emi
ssion peak (nm)
Absorption
(usual pumping) (nm)
Yb:YAG 9 124 1031 942
Yb:Glass 35 31 1020 975
Yb:GdCOB 44 26 1044 976
Yb:BOYS 60 18 1025 975
Yb:KGW 25 44 1023 981
Yb:KYW 24 46 1025 981
Yb:SYS 73 16 1040 979
Yb:YVO4 30 36 1008 984
Yb:CaF2 30 36 1047 980
Yb:CALGO 80 14 1050 980
Material  Emission
cross section(10-20 cm2)
Fluorescence
lifetime (μs)
σem τ(μscm2) Thermal conductivity
(undoped)(W/m/K)
Yb:YAG 2.1 951 1997 11
Yb:Glass 0.05 1300 65 0.8
Yb:GdCOB 0.35 2600 910 2.1
Yb:BOYS 0.3 1100 330 1.8
Yb:KGW 2.8 600 1680 3.3
Yb:KYW 3 600 1800 3.3
Yb:SYS 0.44 820 361 2
Yb:YVO4 1.25 250 312 5.1
Yb:CaF2 0.25 2400 600 9.7
Yb:CALGO 0.8 420 336 11.4
 
 

Feature

  • High thermal conductivity

  • Large gain bandwidth

  • Broad and smooth emission bandwidth

  • Low refractiveindex-temperature gradient

  • Absorption band is covered by high-power InGaAs laser diodes

Application

  • Solid state femtosecond oscillators

  • Ultrafast solid-state laser

    time-resolved spectroscopy, multiphoton imaging, micromachining, refractive surgery, acceleration of particles, X-rays generation, fusion, etc.
    modelocked laser

  • BAW device

  • Diode–pumped short-pulsed modelocked lasers

  • Femtosecond lasers technology

  • Bicolor double-pulse regime

    Yb:CALGO, it is possible to generate double pulses with different wavelengths, which is to our best knowledge the first demonstration of bicolor femtosecond double-pulse operation. Very broad spectrum has been obtained with a bandwidth greater than 30 nm . The spectrum can be fit with two Gaussians: one centered at 1040 nm with a bandwidth of 21 nm and one centred at 1057 nm with a bandwidth of 10 nm with lower amplitude (60%). 

CONTACT DETAILS
Nanjing Crylink Photonics Co.,Ltd
No.3, Hengda Road, Economic and Technological Development Zone, Nanjing, China
No.200,Zhaoxian Road,Jiading District,Shanghai City
Nanjing
Jiangsu
210038
China
Tel: (86)025-68790684
Fax: (86)025-68790685
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