Ceramic Reflector

  • Update:May 22, 2018
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Ceramic reflectors supplied by us work particularly well in Ruby and Nd:YAG laser pumping chambers and can be a highly cost effective alternative to metal coated reflectors. They are also used extensively as reflectors in IPLs.

Product Introduction

Solid-state lasers include all optically pumped lasers in which the gain medium is a solid at room temperature.

Customer requirements will differ dependant upon the type of laser, laser rod, source radiation (and source power) being employed and the particular end use of the laser. All, however, require a high reflectance material to form the pumping chamber cavity surrounding the laser rod and lamp. The efficiency in transfer of radiation from the source to the laser rod (referred to as optical coupling) determines to a large extent the overall efficiency of the laser system. The cavity walls must therefore have a high reflectivity at the absorption bands of the laser material.

Ceramic reflectors supplied by us work particularly well in Ruby and Nd:YAG laser pumping chambers and can be a highly cost effective alternative to metal coated reflectors. They are also used extensively as reflectors in housings for high intensity lamps.

* resists chemical attack

* has high strength

* has a high reflectivity over a broad wavelength band

* has good thermal conductivity and

* excellent dimensional and electrical stability at all operating temperatures.

Independent tests on our alumina have shown reflectance figures in excess of 96% (typically 97-98%) over the 500 nm to 2000 nm wavelengths. The material provides a highly diffuse reflectance, behaving as a bulk reflector of the source radiation by both reflecting and refracting light back into the cavity.

Pump radiation that has a longer wavelength than the stimulated emission does not contribute to the laser output but does heat up the laser crystal, which causes optical distortions affecting the quality of the laser output. For this reason cavities are therefore often water or liquid cooled and so need to be able to withstand the erosive action of the fluid, absorb the generated heat and remain dimensionally stable.

Our reflectors can be glazed both inside the cavity and around the outer edges using a highly reflective glaze that seals the ceramic against ingress of cooling fluids that may alter the refractive index, introduce impurities and reduce reflectance and efficiencies. Glazes can also act as filters andouryellow glazed reflectors have been used successfully in certain applications. The visible yellow colour is complementary to the spectral colours violet and indigo and effectively absorbs these wavelengths up to around 450 nm.

Properties of Ceramics

A porous alumina ceramic of 99.7% Al2O3content, used extensively for long-life laser reflectors. This material is sintered at high temperatures to achieve a controlled porosity.

Prime features

* Surfaces can be sealed and coated with a solarization-resistant glaze to give high bulk reflectivity

* 97.8% reflectance efficiency at 1000nm

* Reflectance efficiency exceeds 96% across the wavelength range 500-2000nm(see curve)

* Controlled porosity

* Good thermal conductivity

* High electrical resistivity

Typical applications

Pumping chambers for Nd:YAG lasers — low to high power, single or multiple lamp designs. Pumping chamber reflectors of this material are virtually indestructible, and prove a highly cost effective alternative to metal coated types.

Production capabilities

* Components up to250mmlong and80mmwide/diameter manufactured as standard

* Larger components manufactured to development contracts

* One-piece or split-cavity designs

* Prototype, batch and volume production

Physical properties

Color                                                              White

Bulk density (fired), Mg/m3                        3.2

Porosity (apparent), % nominal               20

Flexural strength (ASTM C1161, 3-point), MPa    150

Thermal expansion coefficient 200-500C, 10-6/C: 7.9 200-1000C, 10-6/C:9.0

Ceramic Reflectors For Lamp-pumped Solid-state Lasers

BAB– the external shape is round;

ZAB– the external shape is irregular

LAK– the external shape is rectangular but one side is concave;

EAB- the external shape is rectangular

GAZ- the external shape is triangular

Model Length Distance* Hole height Hole length Remark
ZAB-S04-30 30 6 8 12 Rectangle + circular
ZAB-S05-30 30 7.62 8 12 Rectangle + circular
ZAB-S03 45   6 16 Rectangle + circular
ZAB-S04-50 50 6 8 12 Rectangle + circular
ZAB-S05-50 50 7.62 8 12 Rectangle + circular
ZAB-S01 59.5   8 17 Rectangle + circular
ZAB-S02 60   9 30 Rectangle + circular
ZAB205 77 11 11 22 Rectangle, single lamp & single rod
ZAB198 115 26 16   Rectangle, single lamp & single rod
ZAB146 (TCT142D) 142 27 39   Rectangle, dual-lamp & single rod
LAK396 70   12 21 Elliptic, single lamp & single rod
LAK046 94 9     Rectangle, single lamp & single rod
LAK396-100 100   12 21 Elliptic, single lamp & single rod
LAK396-120 120   12 21 Elliptic, single lamp & single rod
LAK396-140 140   12 21 Elliptic, single lamp & single rod
LAK311 145 32     Rectangle, dual-lamp & single rod
LAK396-150 150   12 21 Elliptic, single lamp & single rod
LAK331 160.5 27.5     Rectangle, dual-lamp & single rod
LAK391 186 32     Rectangle, dual-lamp & single rod
BAB259 64 8.5 8 16.5 Cylinder, single lamp & single rod
BAB373 71.5       Elliptic, single lamp & single rod
BAB-S06-89 89 10 9.3 19.3 Cylinder, single lamp & single rod
BAB-S04 92       Elliptic, single lamp & single rod
BAB192 (TCT97, BAB349) 97   12 22 Cylinder, single lamp & single rod
BAB311 97 12.7 15 27.7 Cylinder, single lamp & single rod
BAB275 100   14.4 28.4 Cylinder, single lamp & single rod
BAB283 100   17 32 Cylinder, single lamp & single rod
BAB299 100   17 45 Elliptic, single lamp & single rod
BAB281 100   18 34 Cylinder, single lamp & single rod
BAB228 115   12 22 Cylinder, single lamp & single rod
BAB330 (TCT117) 117   12 22 Cylinder, single lamp & single rod
BAB275-120 120   14.4 28.4 Cylinder, single lamp & single rod
BAB399 120   16 43 Cylinder, single lamp & single rod
BAB350 130   17 45 Elliptic, dual lamp & single rod
BAB492 150   17 45 Elliptic, dual lamp & single rod
BAB496 160   17 45 Elliptic, dual lamp & single rod
BAB497 170   17 45 Elliptic, dual lamp & single rod

Remark: 1) unit: mm; 2) Distance means the distance between lamp and rod in sing-lamp configuration and the distance between two lamps in dual-lamp configuration.

Ceramic Reflectors For Diode-pumped Solid-state Lasers

Description of part number: CRDP-XX-YY-Z-AAA-BBB

CRDP: ceramic reflector for diode-pumped solid-state laser

XX – internal diameter of the reflector in mm.

YY -  reflector length in mm.

Z – number of the diodes to be placed around the laser rod.

AAA – related to the cross section of the reflector such as TRI (triangle shape), CRL (round shape), PLT (plate shape)

BBB – variant for remarks

Model Internal Dia. (mm) Length (mm) Remark
CRDP-12-25-3-PLT 12 25 Suitable for diode side-pumped solid-state lasers, 3 group diode bars placed around the YAG rod
CRDP-12-65-3-PLT 12 65 Suitable for diode side-pumped solid-state lasers, 3 group diode bars placed around the YAG rod
CRDP-12-115-3-PLT 12 115 Suitable for diode side-pumped solid-state lasers, 3 group diode bars placed around the YAG rod
CRDP-6.07-32.26-3-TRI 6.07 32.26 Triangle, offering FF to give better strength, reflectance would be 95/96%.Suitable for diode side-pumped solid-state lasers, 3 group diode bars placed around the YAG rod
CRDP-12.2-67-3-TRI 12.2 67 Triangle, FF,3 group diode bars placed around the YAG rod
CRDP-12.2-76.3-5-CRL 12.2 76.3 Circle reflector, suitablefor diode side-pumped solid-state lasers, 5 group diode bars placed around the YAG rod

Ceramic Reflectors For Beauty and IPL Applications:

Description of part number: CRIPL-XX-YY-BBB

CRIPL: ceramic reflector for beauty and IPL applications

XX – internal diameters or angler of the reflector in mm/degree

YY -  reflector length in mm.

BBB – variant for remarks

Model Internal radius/angle (mm/degree) Length (mm) Remark
CRIPL-4.27/3.28-48/60 4.27-3.28 48 to 60 EAB-074, tear shape reflector
CRIPL-23-46 23046’ 46 LAK-404, glazed, taped ends, 5 holes
CRIPL-19-48-5 19052’ 48 LAK-409, unglazed, with 5 holes
CRIPL-19-48-5G 19052’ 48 LAK283, glazed, with 5 holes
CRIPL-19-48-3 19052’ 48 LAK306, unglazed, with 3 holes
CRIPL-19-48-3G 19052’ 48 LAK317, glazed, with 3 holes

As far as the IPL parts are concerned, there are many “variation on the same theme” in order words the angle may beslightlydifferent, length could vary and some parts have no holes, others have several holes.  Parts could also be glazed or un-glazed.  We can make any parts and we could adapt the drawings to customer’s requirements’.

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