KTN Optical Deflector

What are KTN crystals?

"KTN crystal" is an oxide crystal consisting of potassium (K), tantalum (Ta), and niobium (Nb). By using the property of the KTN crystal that the refractive index can be freely changed by applying a voltage, it is possible to freely control the traveling direction of the incident laser beam.

Overview

Since KTN crystals were first reported in the 1950s, they have been known for their enormous electro-optical effects, but their industrial applications have not progressed until now. The reason for this is that it was extremely difficult to grow large, high-quality crystals. In 2007, NTT Photonics Laboratories (at that time) established a crystal growth technology that could be used as an optical device. Furthermore, through further research on the physical properties of KTN crystals, we discovered the world's first "space charge control electro-optic effect" that controls the refractive index of crystals using a new principle, realizing a high-speed, compact optical deflector with no moving parts.

Feature

High-speed deflector with operating speed of 100 kHz

Since there are no mechanical moving parts and the direction of laser emission is controlled by an external electric field, high-speed operation more than 100 times faster than conventional products (galvanomirrors, polygon mirrors, etc.) is possible. For example, in the medical field, if it is applied as a light source for optical coherence tomography (OCT), diagnosis can be made faster than before, which is expected to reduce the burden on patients.

Realization of miniaturization

It has a simple structure in which electrodes are formed on a KTN crystal, and the chip size is extremely small, only a few millimeters square. increase.

Can operate over a wide wavelength range

KTN crystals are transparent in the wavelength range of 488 to 3500 nm, making it possible to implement devices over a wide wavelength range. We sell visible light, 1.0, 1.3, and 1.5 μm band deflectors as standard specifications. Please inquire about special wavelengths.

Product lineup

One-dimensional KTN optical deflector (fiber input type, spatial input type, mount type)

Specification

Wavelength	Visible	1.0 μm Range	1.3 μm Range	1.5 μm Range
Deflection Angle	150 mrad	120 mrad
Driving Frequency	10-100 kHz
Entrance Aperture	1.0 mm × 1.0 mm (spatial input type)
Output Beam Diameter	~ 0.4 mm (for incident beam diameter 0.5 mm)
Size	Module 23×23×50 mm Mount 25×25×38 mm

2D KTN optical deflector (fiber input type, spatial input type)

Specification

Wavelength	Visible	1.0 μm Range	1.3 μm Range	1.5 μm Range
Deflection Angle	120 × 96 mrad
Driving Frequency	10-100 kHz
Entrance Aperture	φ1.0 mm (spatial input type)
Output Beam Diameter	~0.4 mm (for an incident beam diameter of 0.5 mm)
Size	40×40×100 mm

2D KTN optical deflector (handheld type)

Specification

Wavelength	Visible	1.0 μm Range	1.3 μm Range	1.5 μm Range
Deflection Angle	120×120 mrad
Driving Frequency	0.1~20 kHz
Output Beam Diameter	~ 0.8 mm (for incident beam diameter 0.5 mm)
Size	16×16×114 mm
Weight	60 g

Linear amplifier (DC to 3 kHz 1-channel/2-channel type, 20 kHz type)

Specification

Model number	KST1000A	KST1000B	KAS0201CH
Frequency	DC to 3 kHz (*1)		20 kHz (10 kHz to 30 kHz (*3))
Output Voltage	±600 V (*2)		283 Vrms
DC Bias Output	-		0-500 V
Signal Input Voltage	±10		-
Output Voltage Waveform	-		sine wave
Number of Output Channels	1	2	1
Number of Peltier Controller Channels	1	2	-
Input Voltage	AC 100-230 V / 48-62 Hz
Interface	-		RS-232C (*4)
Dimensions *excluding protrusions	320×430×177 mm		260×350×150 mm

*1 : Characteristics at no load.
*2 : Output voltage can be changed. Please contact us for more information.
*3: A separate external input signal is required.
*4 : A separate control PC is required. (Please contact us for sample programs.)

Resonant power supply (100 kHz type, 200 kHz type)

Specification

Model number	KPS1001CH	KPS2001CH	KDT2001CH
Frequency	100±5 kHz	200 kHz±100 ppm
Output voltage (*1)	±400V	±450V
DC Bias Output	±500V	±600V
Signal Input Voltage	-	-	-
Output Voltage Waveform	sine wave
Number of Output Channels	1	1	1
Number of Peltier Controller Channels	-	-	1
Input Voltage	AC 100-230 V / 48-62 Hz
Interface	RS-232C (*2)
Dimensions *excluding protrusions	150×150×75 mm	246×350×148 mm

*1 : Characteristics of capacitive load (1nF to 2nF).
*2 : A separate control PC is required. (Please contact us for sample programs.)