Features:

TGG Crystals:

• Large Verdet constant (~40 Rad T^-1m^-1)
• Low optical losses (<0.1%/cm)
• High thermal conductivity and High damage threshold (>1GW/cm2)
• Transmission range 400-1100nm, excluding 475-500nm
• Precision-polish and high-transmission AR coating

TSAG Crystals:

• Greater Verdet constant (48 radT^-1m^-1 at 1064 nm), which is 20% higher than that of TGG Crystals
• Low absorption, which is 30% less than that of TGG
• Outstanding thermal properties and compelling mechanical characteristics
• ideal for high-power lasers and compact designs
• Precision polishing and AR coatings available

A Faraday Isolator is a critical optical element to mitigate the undesirable feedback in lasers with continuous waves and repetitive pulses which contribute to detrimental thermal effects. 

TGG Crystal, or Terbium Gallium Garnet Crystal, with chemical composition TbGa5O12, is the most prevalent magneto-optical material used to manufacture Faraday rotators and various magneto-optical components, with its transmission range from visible to near-infrared (400-1100nm, excluding 475-500nm). Through locating a TGG crystal in a magnetic field, a Faraday rotator in which a non-reciprocal rotation of polarization is introduced could be obtained. This rotation in polarization is the principle of an optical isolator. And with its function of rotation on the polarization plane, a lot of optical devices, besides isolators, could also be contrived, such as magneto-optical modulators, circulators, current measuring transducers, etc.

As an excellent kind of magneto-optical crystal, TGG features a large Verdet constant (~40 Rad T^-1 m^-1), superb thermal properties (thermal conductivity 7.4w/m/k), low optical losses (<0.1%/cm), and high laser-induced damage thresholds (>1 GW/cm2). These advantages in total make TGG crystals perform better when coping with high average power fiber lasers than terbium-doped glasses in terms of greater Verdet constant and lower optical losses.

TSAG Crystal, or Terbium Scandium Aluminum Garnet Crystal is a superb magneto-optical material for manufacturing Faraday Optical Isolators of next-generation Fiber Lasers. TSAG crystals are a prevalent kind of media to manufacture Faraday isolators. TSAG crystal is a newly developed crystal and exhibits stronger functionalities than the TGG crystal. The Verdet constants, the parameter that indicates the material’s strength to induce Faraday rotation, of TSAG crystals are impressive, in addition to low thermal-induced birefringence and compelling mechanical characteristics. These virtues in conjunction make TSAG crystals a capable candidate for lasers with high average power, meanwhile allowing compact designs. With its transmission range spanning broadly from 400nm to 1600nm, TSAG is suitable for lasers operating in the VIS and NIR zones. Besides, TSAG crystals could also be utilized as scintillators, such as integrated radiation detectors or scintillation screens.

Hangzhou Shalom EO offers Custom Czochralski-grown, precision-polished Terbium Gallium Garnet (TGG) Crystals and Custom Czochralski-grown precision-polishing TSAG Crystals for Optical Isolators, Faraday Rotators, and Circulators. The crystals are of superior surface quality (10/5 S/D) and deposited with transmission rate AR coatings, ensuring strong magneto-optical effects with effective light-blocking functions in the lasers meanwhile ensuring small optical loss. TSAG crystals with large apertures are also available in Shalom EO.

Besides, Shalom EO also provide other related optical components for fiber lasers (Learn More). Including fiber end caps, C-lens, Fast-axis collimator (FAC Lens), Slow-axis collimator (SAC lens), polarization beam combiner, etc. You can find all these in our catalog on our website.