Cr4+:YAG –An Ideal Material For Passive Q-switching

Short Description:

Cr4+:YAG  is an ideal material for passive Q-switching of Nd:YAG and other Nd and Yb doped lasers in the wavelength range of 0.8 to 1.2um.It is superior stability and reliability, long service life and high damage threshold.Cr4+:YAG crystals have several advantages when compared to traditional Passive Q-switching choices such as organic dyes and colour centres materials.

Product Detail

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Product Description

Crystal Passive Q-switch is preferred for simplicity of manufacturing and operation, low cost, and reduced system size and weight.

Cr4+:YAG is chemically stable, UV resistant and it is durable. Cr4+:YAG will operate over a wide range of temperatures and conditions.

The good thermal conductivity of Cr4+:YAG is well suited for high average power applications.

Excellent results have been demonstrated using Cr4+:YAG as a passive Q-switch for Nd:YAG lasers. The saturation fluence was measured to be approximately 0.5 J/cm2. The slow recovery time of 8.5 µs, as compared to dyes, is useful for the suppression of mode locking.

Q-switched pulsewidths of 7 to 70 ns and repetition rates of up to 30 Hz have been achieved. Laser Damage Threshold tests showed AR coated Cr4+:YAG passive Q-switches exceeded 500 MW/cm2.

The optical quality and homogeneity of Cr4+:YAG is excellent. To minimise insertion loss the crystals are AR coated. Cr4+:YAG crystals are offered with a standard diameter, and a range of optical densities and lengths to match your specifications.

It also can  be used to bonding with Nd:YAG and Nd,Ce:YAG ,casual size such as D5*(85+5)

Advantages Of Cr4+:YAG

● High chemical stability and reliability 
● Being easy to be operated
● High damage threshold (>500MW/cm2)
● As high power, solid state and compact passive Q-Switch
● Long life time and good thermal conductivity

Basic Properties

Product Name Cr4+:Y3Al5O12
Crystal Structure Cubic
Dopant Level 0.5mol-3mol%
Moh Hardness 8.5
Refractive Index 1.82@1064nm
Orientation < 100>within5°orwithin5°
Initial absorption coefficient 0.1~8.5cm@1064nm
Initial transmittance 3%~98%

Technical Parameters

Size 3~20mm, H×W:3×3~20×20mm Upon request of customer
Dimensional tolerances Diameter:±0.05mm, length: ± 0.5mm
Barrel finish Ground finish 400#Gmt
Parallelism ≤ 20"
Perpendicularity  ≤ 15 ′
Flatness < λ/10
Surface Quality 20/10 (MIL-O-13830A)
Wavelength 950 nm ~ 1100nm
AR Coating
≤ 0.2% (@1064nm)
Damage threshold ≥ 500MW/cm2 10ns 1Hz at 1064nm
Chamfer <0.1 mm @ 45°

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