894.6nm

894.6nm Single-mode VCSEL Bare Die for Cs Atomic Clock

894.6nm single-mode VCSEL bare die for Cs atomic clock and cesium vapor-cell optical-source development, with narrow linewidth and low-current CW operation.

Specifications

Product Type: Single-mode VCSEL Bare Die
Wavelength: 894.6nm typ. / 894.1–895.1nm
Optical Output Power: 0.3mW typ. @ Ta=80°C, IF=1.4mA, DC=100%
Operating Mode: CW / DC=100%
SMSR / PER: ≥20dB / ≥15dB
Spectral Linewidth: ≤100MHz
Beam Divergence: 20° typ. at 1/e²

1. 894.6nm Single-mode VCSEL Bare Die for Cs Atomic Clock

The 894.6nm Single-mode VCSEL Bare Die is designed for cesium D1-line optical pumping in Cs vapor-cell atomic clock and CPT cesium atomic clock systems.

This product is supplied as a bare die for chip-level integration, compact vapor-cell optical modules and atomic-clock optical-source development. It is intended for engineering teams that require a low-current, single-mode 894.6nm VCSEL source for Cs atomic clock evaluation, precision timing systems and frequency-reference module development.

The device provides a typical 894.6nm peak wavelength, low-current CW operation, narrow spectral linewidth, single-mode output and defined polarization performance for cesium atomic clock applications.

For the broader application structure, review the Atomic Clock & OPM Magnetometer Solution.

2. Single-mode Optical Characteristics and Cesium Vapor-Cell Application

The 894.6nm wavelength corresponds to cesium D1-line optical-source development. In a Cs vapor-cell atomic clock system, the VCSEL operating wavelength, temperature setpoint, drive current, polarization state, optical alignment and vapor-cell behavior should be validated together at the system level.

Parameter	Value	Condition
Peak Wavelength	894.6nm typ. / 894.1–895.1nm	Ta=80°C, IF=1.4mA, DC=100%
Optical Output Power	0.3mW typ.	Ta=80°C, IF=1.4mA, DC=100%
Threshold Current	0.6mA typ.	According to datasheet condition
Forward Voltage	1.8V typ.	According to datasheet condition
SMSR	≥20dB	Single-mode operation
PER	≥15dB	Defined polarization output
Spectral Linewidth	≤100MHz	Standard specification
Beam Divergence	20° typ. at 1/e²	According to datasheet condition
Wavelength Shift vs. Temperature	0.06nm/K typ.	According to datasheet condition
Wavelength Shift vs. Current	0.3nm/mA typ.	According to datasheet condition
Die Thickness	150µm	Bare die format

This product is suitable for:

Cesium vapor-cell optical pumping

Cs D1-line atomic clock evaluation

CPT cesium atomic clock development

Precision timing and frequency-reference systems

Laboratory optical-source testing for cesium atomic clock research

OEM integration for compact vapor-cell atomic clock modules

Final suitability should be verified according to wavelength tuning, temperature stability, linewidth, polarization behavior, optical alignment, vapor-cell condition and the complete customer system design.

3. Package Options for Atomic Clock Development

Bare Die Supply for Chip-Level Integration

The standard supply form for this product page is bare die. Bare die supply is suitable for customers who need chip-level integration, compact module design, direct optical alignment or custom thermal packaging for cesium vapor-cell atomic clock development.

Bare die integration should be handled in an ESD-controlled process. Customers should verify die bonding, wire bonding, thermal path, optical alignment, current control and temperature-control stability in the final system.

Optional TO-can Package Configuration

For projects that require a packaged optical source, optional TO-can package configuration can be discussed as a project-specific configuration.

Optional project configurations may include TO-can packaging, integrated TEC / Peltier, NTC or PT1000 temperature sensing, vacuum-sealed or dry-nitrogen-filled package atmosphere, ceramic submount, collimating lens and application-specific thermal integration.

These options are not the default supply form of this page. Package structure, pin definition, optical geometry, temperature sensor, sealing method and preparation time should be confirmed separately according to the order-specific requirement.

TEC, NTC / PT1000 and Sealing Options

Temperature control is important for cesium D1-line wavelength matching. For packaged project configurations, TEC / Peltier control and temperature-sensor selection may be reviewed according to the required wavelength setpoint and module structure.

NTC and PT1000 temperature-sensing options, vacuum-sealed packages and dry-nitrogen-filled packages may be discussed for project-specific integration. Final configuration should be confirmed before production.

4. Paid Evaluation Samples and Project Support

Paid evaluation samples are available for early-stage wavelength, linewidth, optical-power, polarization and vapor-cell system validation. The standard evaluation quantity is 5 pcs per set.

Evaluation support can help customers verify:

894.6nm wavelength matching

Cesium D1-line optical-source behavior

Optical output power

Linewidth and single-mode performance

Polarization performance

Temperature-control requirements

Bare die integration or package-configuration direction

Vapor-cell atomic-clock system compatibility

Request Paid Atomic-Clock VCSEL Evaluation Samples

For project-specific wavelength binning, package configuration, TEC integration, temperature sensing or vapor-cell module adaptation, submit the application information and target operating conditions for engineering review.

Submit Custom Development & ODM

For cesium OPM magnetometer projects, review the related page:

894.6nm Single-mode VCSEL Bare Die for Cs OPM Magnetometer.

5. Frequently Asked Questions

FAQ 1. Is this 894.6nm VCSEL designed for cesium atomic clock applications?

Yes. This 894.6nm Single-mode VCSEL Bare Die is designed for cesium D1-line optical pumping, Cs vapor-cell atomic clock evaluation and CPT cesium atomic clock development.

The device should be validated together with the customer’s vapor cell, temperature-control design, optical alignment, polarization condition and frequency-reference system.

FAQ 2. Is this product supplied as bare die or packaged VCSEL?

This product page refers to bare die supply as the standard form.

Optional TO-can package configuration, TEC / Peltier integration, NTC or PT1000 temperature sensing, vacuum sealing, dry-nitrogen filling, ceramic submounts and collimating lenses may be discussed as project-specific configurations. These package options are not treated as the default configuration of this page.

FAQ 3. Can this 894.6nm VCSEL be used for OPM magnetometer applications?

This page is focused on cesium atomic clock and CPT cesium atomic clock applications.

For cesium optically pumped magnetometer and vapor-cell magnetic sensing applications, please review the dedicated 894.6nm Cs OPM VCSEL page. OPM projects may require different optical-power targets, linewidth requirements, package structure and magnetic-environment considerations.