High Power RTP Pockels Cell

SKU: RTPM

RTP (Rubidium Titanyl Phosphate) crystals offer some of the best electro-optic properties among known materials. Advantages include low driving voltage, no piezoelectric ringing, high optical damage threshold (without gray-track formation under intense laser exposure), high resistivity, a broad transmission range (0.35–3.5 µm), short-wavelength durability, non-hygroscopicity, low insertion loss, and compatibility with high-repetition-rate applications. To ensure long-term thermal and environmental stability, our RTP Pockels cells use a matched pair of crystals to cancel out birefringence drift due to thermal expansion. The electric field is applied perpendicular to the optical axis, which ensures a uniform electro-optic response and minimal distortion of the laser’s spatial mode. These cells operate at low voltage and are available in aperture sizes of 2 mm, 4 mm, 6 mm, and 8 mm. Polarization beam splitter cubes can be aligned and mounted at both input and output ends to configure the device as an intensity modulator. The voltage required to induce a half-wave or a π phase shift (Vπ) in the optical signal is given by the equation:  where:
     λ is the wavelength of light,
     d is the electrode spacing,
     n is the refractive index of the crystal,
     r is the electro-optic coefficient,
     L is the crystal length along the light path.
The Vπ voltage is proportional to the wavelength and inversely proportional to the crystal length.
Optical power handling depends on the clear aperture size and the electro-optic (EO) material selected. Aperture size and crystal length dictate the required drive voltage. Compatible drivers are available on our website. For high-speed modulation, acousto-optic modulators (AOMs) should also be considered.

RTP Pockels Cell Selection Guide

P/N	Wavelength (nm)		Aperture (mm)		Halfwave Voltage		Price (ea.)*			Buy	Datasheet
RTPM042A	350-450		2x2x12		650		$𝟫𝟨𝟩
RTPM052A	400-600		2x2x12		800		$𝟫𝟨𝟩
RTPM072A	600-900		2x2x12		1120		$𝟫𝟨𝟩
RTPM092A	900-1250		2x2x12		1600		$𝟫𝟨𝟩
RTPM044A	350-430		4x4x12		1280		$𝟣,𝟨𝟫𝟧
RTPM054A	400-600		4x4x12		1650		$𝟣,𝟨𝟫𝟧
RTPM074A	600-900		4x4x12		2300		$𝟣,𝟨𝟫𝟧
RTPM094A	900-1250		4x4x12		3200		$𝟣,𝟨𝟫𝟧
RTPM046B	350-430		6x6x22		1100		$𝟩,𝟫𝟪𝟪
RTPM056B	400-600		6x6x22		1350		$𝟩,𝟫𝟪𝟪
RTPM076B	600-900		6x6x22		1900		$𝟩,𝟫𝟪𝟪
RTPM096B	900-1250		6x6x22		2700		$𝟩,𝟫𝟪𝟪
RTPM048B	350-430		8x8x22		1280		$𝟣𝟢,𝟧𝟫𝟩
RTPM058B	400-600		8x8x22		1650		$𝟣𝟢,𝟧𝟫𝟩
RTPM078B	600-900		8x8x22		2300		$𝟣𝟢,𝟧𝟫𝟩
RTPM098B	900-1250		8x8x22		3200		$𝟣𝟢,𝟧𝟫𝟩
RTPM188B	1800-2500
* If the order <5 pc, AR coating lot charge may be required