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Seeking a few Research Scientists or Postdoctoral Researchers (W21259)


Ultrafast Coherent Soft X-ray Photonics Research Team
RIKEN Center for Advanced Photonics
(Laboratory head: Eiji J. Takahashi)

Research Field

Our team has just started since this January and mainly focuses on the research on high-intensity ultrashort laser sources, and promotes the development of new ultrafast quantum beam and its application research.

For more details, please refer to the following link.

Job title and Job description

Job title, available positions

Research Scientist or Postdoctoral Researcher: a few positions

  • Postdoctoral Researcher is defined as those with a doctoral degree of 5 years or less.
  • Research Scientist is defined as those with a doctoral degree more than 5 years.

*Job judgment will be decided and decided based on applicant's ability, aptitude etc.

Job description

Successful candidates are expected to carry out one of the following three: (1) development of high-energy laser systems (2) development of coherent soft x-ray sources based on high-order harmonic generation and its application researches, and (3) experimental research related to the strong-field physics using ultra-short laser pulses.


The candidate should possess a doctoral degree (or should be expected to obtain a doctoral degree before the starting date) in a related research field. Research experiences related to the above three subjects of this laboratory are preferred, but previous experience is not mandatory as long as the candidate has strong interest. Young researchers willing to carry out the development of new laser sources and/or challenging its application research are most welcome.

Work location

Branch and address

RIKEN Wako (2-1 Hirosawa, Wako, Saitama 351-0198)

Salary and benefits

  • 1.One-year fixed-term employment contract, renewable based on evaluation, to a maximum of 7 years of employment (Research Scientist)or to a maximum 5 years(Postdoctoral Researcher) of employment.
  • 2.RIKEN may adjust the above maximum period of renewability based on a) the employee’s abilities, work load at the time of contract completion, performance and work attitude and b) the continuation of the employee’s center, laboratory or project and RIKEN’s management situation and budget at the time. In principle, employment contracts will not be renewed for individuals older than 65 years.
  • 3.The employee’s period of fixed-term employment cannot exceed 10 years from the initial date of hire (or 10 years from April 1, 2013 for fixed-term employees already at RIKEN prior to this date).
  • 4.When the center to which the Employee is affiliated is scheduled for a final review in FY2024 and it is decided that the Employee's research will not be continued, the provision given above for projects of limited duration applies and the Employee's contract will not be renewed for the FY2025 year that would extend employment beyond the center's final fiscal year.
  • 5.For Research Scientist: When the Employee's research is scheduled for review in the Employee's 5years from the original date of hire at RAP, and when it is concluded that there is reason* to believe it will be difficult for the research (or technology development) to be continued, the employment contract will not be renewed for the next year. (*The reason may relate to the Employee's abilities, performance and/or work attitude.)

In principle, the first two months of employment is considered a trial period.
Salary will be commensurate with qualifications and experience. Discretionary work, commuting and housing allowances will be provided. Social insurance will be applied. Mandatory membership in the RIKEN Mutual Benefit Society (RIKEN Kyosaikai).
This position falls under the specialized duties discretionary work system; one working day will be calculated as 7 hours and 30 minutes.

Days off include public holidays, New Year's holidays (Dec. 29 - Jan 3), and RIKEN Foundation Day.
Paid leave includes annual paid leave (up to 20 days depending on the month of employment), special paid leave (childcare, family nursing care, etc.), and work life balance holidays (up to 7 days depending on the month of employment).
There are also additional leave systems such as maternity leave, childcare leave, and family nursing care leave.
RIKEN has introduced telework as a temporary and special measure to prevent the spread of COVID-19. You may be asked to work from home according to the instructions of the institute. You can also choose to work from home with the permission of your supervisor.
No smoking on site (designated smoking areas available).
These and other provisions are in accordance with RIKEN regulations.

RIKEN is actively undertaking initiatives to promote gender equality and diversity, and moving forward with the establishment of a diverse and vibrant research environment. If multiple candidates are found to have the same aptitude following a fair assessment, active efforts will be made to recruit female candidates.

Also, eligible for an exemption from repayment for category 1 scholarship loans provided by the Japan Student Services Organization before fiscal year 2003, and eligible applying for the MEXT Grants-in-Aid for Scientific Research (Kakenhi).

Application and required documents

Required documents

  • 1.Complete CV or CV (with photo and email address)
    • *1(RIKEN CV) Write the open call ID "W21259", indicated in the parentheses next to the job title, in open call ID section in the upper right corner of your CV.
    • *2(Original CV) Write down in the notes section of your CV the number written next to the title of the job position (e.g. W21259).
  • 2.Research and development achievements (list of publications, list of patents, list of presentations etc.)
  • 3.A letter of recommendation including one from the current supervisor
    Please specify the referee’s contact information (Name, affiliation, job title, phone number, and email address)
    (If the current supervisor’s recommendation is not available, a recommendation letter from a third party will be accepted)
  • 4.Brief description of previous research and future research plans (within two A4-size pages)
  • 5.One set of copies of your major papers (maximum number: 3)
  • 6.Consent form for handling personal information based on GDPR
    If you are a resident of the European Economic Area (EEA), you are required to submit the document, "Consent form for handling personal information based on GDPR" with your signature.

    *You will find detailed information about General Data Protection Regulation (GDPR) on the following website:
    Data protection | European Commission

How to apply

The above documents except the recommendation letter should be combined into a single ZIP file or PDF file and uploaded to the following website:
Application for Ultrafast Coherent Soft X-ray Photonics Research Team, Center for Advanced Photonics, RIKEN

The uploaded file name should contain your name.
When uploading the file(s), your contact email address is required.

Recommendation letters must be directly submitted from the referee to the following website.
Application for Ultrafast Coherent Soft X-ray Photonics Research Team, Center for Advanced Photonics, RIKEN

The recommendation letter should be named as "Ultrafast Coherent Soft X-ray Photonics Research (Name of Applicant)_(Name of Referee)".
When uploading the letter, the referee’s contact email address is required.
If a confirmation email is not received within 7 days after submission, please contact: the e-mail address at contact information below.


Open until the position is filled

Handling Personal Data

Submitted documents are strictly protected under the RIKEN Privacy Policy and will be used only for the purpose of applicant screening. Personal information will not be disclosed, transferred or loaned to a third party under any circumstances without just cause.

Selection process

Application screening and interview for selected applicants

Start of Employment

As early as possible

Contact Information

Ultrafast Coherent Soft X-ray Photonics Research Team, RIKEN Center for Advanced Photonics
Email: ufsxp-info [at] ml.riken.jp
For inquiries, please contact via email.

*If you have any research-related inquiries, please contact ejtak [at] riken.jp (Laboratory head: Dr. E. J. Takahashi)
We highly recommend contacting Dr. E. J. Takahashi (ejtak [at] riken.jp) in advance of your official application.