Passive Crystal

Chemical   Formula

Cr   4+ :Y3 A15 O12

Crystal   Structure

Cubic   garnet

Recovery   time

8.5 us

Hardness   Mohs

8.5

Density

4.56g/cm3

Orientation

[100]+/-10°

Thermal   conductivity

12.13w/m/k

Refractive   index

1.82   @ 1064nm

Optical   Properties

Base   state absorption cross section

delta   s 1 =4.3x10-18 cm2

Emission   state absorption cross section

delta   s 2 =8.2x10-19 cm2

Fluorescence   lifetime

3.4us

Capabilities

Cr   4+ dopant concentration

0.5   mol% ~ 3 mol%

Aperture

2x2   ~ 14x14mm

Initial   transmission

10%   ~ 99%

Typical   Specification and Tolerance

Dimension   tolerance

(W +/-   0.1mm) x (H +/- 0.1mm) x (L + 0.2mm/-0.1mm)

Flatness

<   L/8 @ 633nm

Scratch/Dig   code

better   than 10/5 Scratch/dig per MIL-O-13830A

Parallelism

<   20 arc seconds

Perpendicularity

<   5 arc minutes

Wavefront   distortion

less   than L/8 @ 633nm

Clear   aperture

>   90% central area

Coating

Anti-reflective