|
Introduction
The Q-switch is built using two RTP
elements in a temperature
compensating design. The unique properties of RTP, including
high electrical resistivity (~1011-1012W·cm) and a high
damage threshold, result in a Q-switch with outstanding
properties. These Q-switches have been tested at 100 kHz,
with no sign of piezoelectric ringing.
Advantages:
 an excellent crystal for Electro
Optical applications at high repetition rate.
High Damage Threshold
No Piezoelectric Ringing
Low Insertion Loss
Thermal Compensating Design
Non-hygroscopic
High Extinction and Contrast Ratio
Spectral range 500-3000 nm
not induce piezo-electric effect
.
Physical and Chemical Properties:
| Crystal Structure |
Orthorhombic, |
| Lattice Parameters |
a
= 12.96 A°,b = 10.56
A,c = 6.49A°
|
| Density |
3.6 g/cm3 |
| Melting Point |
~ 1000
°C |
| Ferroeletric transition
temperature |
~810°C |
| Mohs Hardness |
~5 |
| Thermal Expansion
Coefficients,/°C
|
a1=1.01x10^-5,
a2=1.37x10^-5, a3=-4.17x10^-6 |
| Hygroscopic Susceptibility |
No |
| Dielectric Constant |
Eeff
= 13.0, |
| Color |
Colorless
|
Ionic conductivity
(room temperature, 10kHz)
|
10^-8 S/cm
|
Optical properties:
| Transmitting range: |
350~4500 nm |
| Sellmeier equations:
Ni^2=Ai+Bi[1-(Ci/λ)^2]-Diλ^2 |
index |
A |
B |
C |
D |
| Nx |
2.15559 |
0.93307 |
0.20994 |
0.01452 |
| Ny |
2.38494 |
0.73603 |
0.23891 |
0.01583 |
| Nz |
2.27723 |
1.11030 |
0.23454 |
0.01995 |
| Absorption
coefficient: |
< 0.05 %
/ cm @ 1064 nm < 4 % /cm @ 532 nm |
Nonlinear properties:
| Nonlinear Coefficients:
|
d15 = 2.0 pm/V
|
| d24 = 3.6 pm/V
|
| d31 = 2.0 pm/V
|
| d32 = 3.6 pm/V
|
| d33 = 8.3 pm/V |
| deff fortype II SHG@1064nm=
2.39 pm/V |
| Electro-optic
coefficients:(pm/V)
|
Xcut Propagation
Low frequency
|
Y cut Propagation
Low frequency
|
| r13 |
10.6 |
| r23 |
12.5 |
| r33 |
35 |
38.5 |
| Static Half Wave Voltage @1064nm:
|
1445 V for a pair of 4x4x10mm |
| 1,600 V for a pair of 4x4x20mm |
| 1,700 V for a pair of 6x6x7mm
|
| 2,400 V for a pair of 6x6x20 mm
|
Damage Threshold:10 nsec pulse
|
600 MW/cm2 @ 1064
nm,
|
| Contrast
Ratio: |
20 dB @ 633 nm |
Standard Specifications:
| Dimension
tolerance: |
±0.1mm |
| Flatness:
|
<l/8 @633nm
|
| Surface quality: Scratch/Dig
|
10/5
|
| Parallelism:
|
better than
30 arc sec.
|
| Perpendicularity:
|
better than
30 arc min
|
| Angle tolerance:
|
△q
< 0.5°,△f
< 0.5°
|
| AR
coating:
|
AR coatings
|
| Clear aperture:
|
>90%
central area
|
| Transmitting wavefront distortion:
|
less than
l/8 @ 633nm
|
|
Q-Switch